/* roulang page: index */
:root {
  --bg: #05070F;
  --panel: #0A1120;
  --panel-2: #0C1526;
  --glass-bg: rgba(16, 26, 52, 0.62);
  --glass-border: rgba(120, 175, 255, 0.22);
  --line: rgba(130, 165, 220, 0.16);
  --text: #EEF4FF;
  --text-sub: #B2C2E0;
  --text-weak: #7B8EB3;
  --blue: #2F6BFF;
  --blue-hover: #4A85FF;
  --ice: #22D9D0;
  --warn: #FFAA5C;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.18);
  --shadow-md: 0 18px 50px rgba(0, 0, 0, 0.30);
  --shadow-blue: 0 8px 30px rgba(35, 80, 255, 0.35);
  --font-main: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-num: "Bahnschrift", "DIN Alternate", "Roboto", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  background:
    radial-gradient(520px 420px at 8% -6%, rgba(47, 107, 255, 0.12), transparent 70%),
    radial-gradient(480px 380px at 92% 22%, rgba(34, 217, 208, 0.07), transparent 65%),
    var(--bg);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--text);
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  will-change: transform;
}

.btn svg {
  flex-shrink: 0;
}

.btn-primary {
  background: linear-gradient(180deg, #2F6BFF, #2255E0);
  color: #fff;
  box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #4A85FF, #2F6BFF);
  transform: translateY(-2px);
  box-shadow: 0 12px 38px rgba(35, 80, 255, 0.45);
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 6px 20px rgba(35, 80, 255, 0.28);
}

.btn-ice {
  background: linear-gradient(135deg, #18D6CF, #10A8B8);
  color: #041014;
  box-shadow: 0 0 26px rgba(34, 217, 208, 0.35);
}

.btn-ice:hover {
  filter: brightness(1.07);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: rgba(160, 190, 240, 0.28);
  color: rgba(255, 255, 255, 0.85);
}

.btn-outline:hover {
  border-color: rgba(34, 217, 208, 0.72);
  color: var(--ice);
  background: rgba(34, 217, 208, 0.06);
}

.btn-outline:active {
  transform: translateY(1px);
}

.btn-text-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--ice);
  font-size: 15px;
  font-weight: 600;
  transition: gap 0.2s ease;
}

.btn-text-link:hover {
  gap: 9px;
  color: #5CE5DE;
}

.btn:focus-visible,
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

/* Tag */
.tag {
  display: inline-flex;
  align-items: center;
  height: 26px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.02em;
  background: rgba(34, 217, 208, 0.08);
  border: 1px solid rgba(34, 217, 208, 0.24);
  color: #A6F1ED;
  white-space: nowrap;
}

/* Hero */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: 140px 0 90px;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  background: var(--bg);
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.48;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 7, 15, 0.86) 0%, rgba(5, 7, 15, 0.56) 50%, rgba(5, 7, 15, 0.20) 100%),
    linear-gradient(180deg, rgba(5, 7, 15, 0.17) 0%, rgba(5, 7, 15, 0.55) 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  color: #B9FCF7;
  background: rgba(34, 217, 208, 0.08);
  border: 1px solid rgba(34, 217, 208, 0.25);
  margin-bottom: 24px;
}

.live-dot {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ice);
}

.live-dot::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid rgba(34, 217, 208, 0.55);
  animation: pulse-ring 2s ease-out infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.5); opacity: 0.9; }
  70% { transform: scale(1.4); opacity: 0; }
  100% { transform: scale(1.4); opacity: 0; }
}

.hero h1 {
  font-size: clamp(36px, 4.4vw, 58px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: #F5F9FF;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  line-height: 1.9;
  color: var(--text-sub);
  max-width: 560px;
  margin-bottom: 30px;
}

.hero-points {
  display: grid;
  gap: 12px;
  margin-bottom: 38px;
}

.hero-point {
  position: relative;
  padding-left: 18px;
  color: #C8D6F0;
  font-size: 15px;
}

.hero-point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--ice);
  box-shadow: 0 0 10px rgba(34, 217, 208, 0.6);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-visual {
  position: relative;
}

.device-frame {
  position: relative;
  width: 100%;
  max-width: 590px;
  margin-left: auto;
  border-radius: 24px;
  overflow: hidden;
  background: #0A1120;
  box-shadow: var(--shadow-md), inset 0 0 0 1px var(--glass-border);
  z-index: 1;
}

.device-frame::before {
  content: "";
  display: block;
  padding-top: 72%;
}

.device-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.device-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: 24px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.float-card {
  position: absolute;
  z-index: 3;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 12px 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 12px;
  color: #D9E7FF;
  font-size: 13px;
  line-height: 1.4;
}

.float-card strong {
  display: block;
  font-size: 14px;
  color: #F2F7FF;
}

.float-card--1 {
  top: 28px;
  left: -26px;
}

.float-card--2 {
  bottom: 34px;
  right: -20px;
}

.card-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(34, 217, 208, 0.12);
  border: 1px solid rgba(34, 217, 208, 0.2);
}

/* Trust strip */
.trust-strip {
  background: #070E1A;
  border-top: 1px solid rgba(130, 165, 220, 0.12);
  border-bottom: 1px solid rgba(130, 165, 220, 0.12);
  padding: 28px 0;
}

.trust-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 8px;
  border-left: 1px solid rgba(130, 165, 220, 0.13);
  padding-left: 18px;
  color: var(--text-sub);
  font-size: 14px;
}

.trust-item:first-child {
  border-left: 0;
  padding-left: 0;
}

.trust-item span {
  display: block;
  font-size: 17px;
  font-weight: 700;
  color: #EAF2FF;
  margin-bottom: 2px;
}

/* Section */
.section {
  padding: 96px 0;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 56px;
}

.section-head-title h2 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: #EFF5FF;
}

.section-head-title .lead {
  margin-top: 12px;
  color: var(--text-sub);
  font-size: 16px;
  max-width: 720px;
}

.section-title-mark {
  width: 34px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--ice), transparent);
  margin-bottom: 16px;
}

/* Feature preview */
.feature-section {
  background: linear-gradient(180deg, #070D19 0%, #0A1120 100%);
}

.feature-grid {
  display: grid;
  grid-template-columns: 0.32fr 0.68fr;
  gap: 44px;
  align-items: stretch;
}

.feature-tabs {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-tab {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  text-align: left;
  padding: 22px 20px;
  border-radius: 16px;
  background: rgba(13, 21, 40, 0.72);
  border: 1px solid var(--line);
  color: var(--text-sub);
  transition: border-color 0.25s ease, background 0.25s ease, color 0.25s ease;
  width: 100%;
}

.feature-tab:hover {
  border-color: rgba(34, 217, 208, 0.25);
  color: var(--text);
}

.feature-tab.is-active {
  background: rgba(34, 217, 208, 0.08);
  border-color: rgba(34, 217, 208, 0.34);
  color: #EAF7FF;
  box-shadow: 0 12px 35px rgba(4, 10, 25, 0.36);
}

.feature-tab-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(47, 107, 255, 0.12);
  border: 1px solid rgba(120, 175, 255, 0.12);
}

.feature-tab h4 {
  font-size: 17px;
  color: inherit;
  margin-bottom: 4px;
}

.feature-tab p {
  font-size: 13px;
  color: var(--text-weak);
  line-height: 1.7;
}

.shot-panel {
  background: rgba(10, 17, 32, 0.64);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 26px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  min-height: 420px;
}

.screen-shell {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: #04070F;
  border: 1px solid var(--line);
  width: 100%;
}

.screen-shell::before {
  content: "";
  display: block;
  padding-top: 58.5%;
}

.screen-shell img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.screen-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.shot-caption {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 22px;
  margin-top: auto;
}

.shot-copy {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.8;
}

.shot-copy strong {
  display: block;
  color: #DDE8FF;
  font-size: 17px;
  margin-bottom: 6px;
}

.mini-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mini-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: #2A3854;
  border: 0;
  padding: 0;
  transition: width 0.2s ease, background 0.2s ease;
}

.mini-dot.is-active {
  width: 28px;
  background: var(--ice);
}

/* Spec section */
.spec-grid {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 60px;
  align-items: start;
}

.spec-intro .tag {
  margin-bottom: 18px;
}

.spec-intro h3 {
  font-size: 24px;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #EEF4FF;
}

.spec-intro p {
  color: var(--text-sub);
  margin-bottom: 16px;
  font-size: 15px;
}

.spec-intro .btn-text-link {
  margin-top: 14px;
}

.spec-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: #0B1424;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.spec-col {
  padding: 28px 24px;
  border-right: 1px solid var(--line);
}

.spec-col:last-child {
  border-right: 0;
}

.spec-col h4 {
  font-size: 15px;
  color: var(--ice);
  margin-bottom: 22px;
  font-weight: 600;
}

.spec-col li {
  position: relative;
  padding: 12px 0;
  border-bottom: 1px solid rgba(130, 165, 220, 0.09);
  color: #C9D7F0;
  font-size: 14px;
  line-height: 1.65;
}

.spec-col li:last-child {
  border-bottom: 0;
}

/* Reviews wall */
.review-wall {
  columns: 2;
  column-gap: 24px;
}

.review-card {
  display: inline-block;
  width: 100%;
  margin-bottom: 24px;
  background: rgba(13, 21, 40, 0.88);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 217, 208, 0.22);
}

.stars {
  display: flex;
  gap: 3px;
  color: var(--ice);
  font-size: 14px;
  margin-bottom: 14px;
}

.review-card blockquote {
  font-size: 15px;
  line-height: 1.9;
  color: #C7D6F2;
  margin-bottom: 18px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), #1040A0);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
}

.review-author .name {
  font-size: 14px;
  color: #E3ECFF;
}

.review-author .role {
  font-size: 12px;
  color: var(--text-weak);
}

/* News */
.news-section {
  background: linear-gradient(180deg, #070D19, #05070F);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: rgba(11, 20, 36, 0.92);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.news-card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 217, 208, 0.22);
  box-shadow: var(--shadow-md);
}

.news-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.news-meta time {
  color: var(--text-weak);
  font-size: 13px;
}

.news-card h3 {
  font-size: 17px;
  color: #EAF1FF;
  line-height: 1.5;
  margin-bottom: 12px;
  font-weight: 650;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.news-card p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  margin-bottom: 16px;
}

.news-card .read-more {
  margin-top: auto;
  color: var(--ice);
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.news-empty {
  padding: 40px 0 10px;
}

.news-empty-inner {
  height: 160px;
  border: 1px dashed rgba(130, 165, 220, 0.26);
  border-radius: 18px;
  background: rgba(10, 17, 32, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-weak);
  font-size: 14px;
}

.section-foot-link {
  margin-top: 36px;
  text-align: center;
}

/* Download zone */
.download-zone {
  position: relative;
  padding: 96px 0;
  overflow: hidden;
  border-top: 1px solid rgba(130, 165, 220, 0.12);
  border-bottom: 1px solid rgba(130, 165, 220, 0.12);
}

.download-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.download-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.download-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 15, 0.85), rgba(5, 7, 15, 0.92));
}

.download-wrap {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.download-heading .tag {
  margin-bottom: 18px;
}

.download-heading h2 {
  font-size: clamp(26px, 3vw, 38px);
  color: #EFF5FF;
  line-height: 1.3;
  margin-bottom: 14px;
}

.download-heading p {
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.9;
  max-width: 560px;
}

.dl-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 30px;
}

.dl-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 18px;
  border-radius: 16px;
  background: rgba(16, 26, 52, 0.66);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  color: #EAF2FF;
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.dl-btn:hover {
  border-color: rgba(34, 217, 208, 0.38);
  transform: translateY(-3px);
  background: rgba(22, 38, 72, 0.8);
}

.dl-btn small {
  display: block;
  font-size: 12px;
  color: var(--text-weak);
  line-height: 1.4;
}

.dl-btn strong {
  font-size: 15px;
  font-weight: 600;
  color: #DDE8FF;
}

.dl-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: rgba(47, 107, 255, 0.15);
  border: 1px solid rgba(120, 175, 255, 0.18);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #8DB6FF;
}

.download-aside {
  background: rgba(10, 17, 32, 0.68);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 28px;
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  text-align: center;
  box-shadow: var(--shadow-md);
}

.qr-box {
  width: 132px;
  height: 132px;
  margin: 0 auto 18px;
  border-radius: 14px;
  background: #EAF2FF;
  padding: 10px;
  line-height: 0;
}

.qr-box svg {
  width: 100%;
  height: 100%;
}

.download-aside p {
  color: var(--text-sub);
  font-size: 14px;
}

.download-aside strong {
  color: #DCE9FF;
  font-size: 15px;
}

.security-note {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(130, 165, 220, 0.12);
  color: var(--text-weak);
  font-size: 13px;
  line-height: 1.8;
}

/* FAQ */
.faq-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 28px;
}

.faq-item {
  background: rgba(13, 21, 40, 0.82);
  border: 1px solid var(--line);
  border-radius: 14px;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: rgba(34, 217, 208, 0.3);
  background: rgba(15, 25, 48, 0.9);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  cursor: pointer;
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: #DFE9FF;
  line-height: 1.6;
  min-height: 56px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 24px;
  font-weight: 400;
  color: var(--ice);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(34, 217, 208, 0.1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 20px 20px;
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.9;
}

/* Footer */
.site-footer {
  background: #04060D;
  border-top: 1px solid rgba(130, 165, 220, 0.08);
}

.footer-top {
  padding: 64px 0 44px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 0.75fr;
  gap: 48px;
}

.footer-brand .brand {
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.9;
  max-width: 340px;
}

.footer-title {
  font-size: 15px;
  color: #DCE7FF;
  font-weight: 600;
  margin-bottom: 18px;
}

.footer-grid ul li + li {
  margin-top: 10px;
}

.footer-grid ul a {
  color: var(--text-sub);
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-grid ul a:hover {
  color: var(--ice);
}

.footer-contact {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 2;
}

.footer-bottom {
  border-top: 1px solid rgba(130, 165, 220, 0.06);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--text-weak);
  font-size: 13px;
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  flex-shrink: 0;
}

.brand-text {
  line-height: 1.3;
}

.brand-text strong {
  display: block;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #EEF6FF;
}

.brand-text small {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-weak);
  margin-top: 3px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  height: 76px;
  background: rgba(6, 10, 20, 0.75);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(130, 165, 220, 0.10);
  transition: box-shadow 0.2s ease, background 0.2s ease;
}

.site-header.is-scrolled {
  background: rgba(5, 8, 16, 0.88);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
}

.header-inner {
  height: 76px;
  display: flex;
  align-items: center;
  gap: 28px;
  position: relative;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 auto;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-sub);
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover {
  color: #fff;
  background: rgba(34, 217, 208, 0.08);
}

.nav-link.is-active {
  color: var(--ice);
  background: rgba(34, 217, 208, 0.08);
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  border-radius: 999px;
  background: var(--ice);
  box-shadow: 0 0 10px rgba(34, 217, 208, 0.65);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-actions .btn {
  min-height: 40px;
  padding: 0 18px;
  border-radius: 10px;
  font-size: 14px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: transparent;
  border: 1px solid rgba(130, 165, 220, 0.2);
  align-items: center;
  justify-content: center;
  color: #D3E2FF;
}

@media (max-width: 1199px) {
  .hero-inner {
    gap: 36px;
  }

  .header-actions .btn-outline {
    display: none;
  }
}

@media (max-width: 1023px) {
  .section {
    padding: 80px 0;
  }

  .hero {
    padding: 120px 0 70px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-visual {
    max-width: 640px;
  }

  .device-frame {
    max-width: 100%;
    margin-left: 0;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .feature-tabs {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 8px;
  }

  .feature-tab {
    min-width: 220px;
  }

  .spec-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .spec-columns {
    grid-template-columns: repeat(3, 1fr);
  }

  .download-wrap {
    grid-template-columns: 1fr;
  }

  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .faq-two-col {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .header-actions .btn-primary {
    display: none;
  }

  .nav-menu {
    margin: 0;
  }
}

@media (max-width: 767px) {
  .section {
    padding: 64px 0;
  }

  .site-header,
  .header-inner {
    height: 62px;
  }

  .header-inner {
    gap: 12px;
  }

  .site-header {
    background: rgba(4, 7, 14, 0.92);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-menu-wrap {
    display: none;
    position: absolute;
    top: 62px;
    left: 0;
    width: 100%;
    background: rgba(5, 7, 15, 0.98);
    -webkit-backdrop-filter: blur(24px);
    backdrop-filter: blur(24px);
    padding: 12px 20px 20px;
    border-bottom: 1px solid rgba(130, 165, 220, 0.12);
  }

  .site-header.is-open .nav-menu-wrap {
    display: block;
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .nav-link.is-active::after {
    display: none;
  }

  .header-actions .btn-primary {
    display: inline-flex;
    min-height: 40px;
  }

  .brand-text strong {
    font-size: 16px;
  }

  .hero {
    min-height: auto;
    padding: 100px 0 56px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .float-card--2 {
    right: -8px;
    bottom: 16px;
  }

  .float-card--1 {
    left: -4px;
  }

  .trust-grid {
    flex-direction: column;
  }

  .trust-item {
    border-left: 0;
    padding-left: 4px;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 36px;
  }

  .shot-panel {
    padding: 16px;
    min-height: auto;
  }

  .shot-caption {
    flex-direction: column;
  }

  .spec-columns {
    grid-template-columns: 1fr;
  }

  .spec-col {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .spec-col:last-child {
    border-bottom: 0;
  }

  .review-wall {
    columns: 1;
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .dl-grid {
    grid-template-columns: 1fr;
  }

  .download-wrap {
    gap: 32px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
  }

  .float-card {
    padding: 8px 12px;
    font-size: 12px;
  }

  .card-icon {
    width: 28px;
    height: 28px;
  }
}

@media (max-width: 520px) {
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }

  .header-actions .btn-primary {
    display: none;
  }

  .brand-text small {
    display: none;
  }

  .hero h1 {
    font-size: 32px;
  }

  .float-card--1,
  .float-card--2 {
    display: none;
  }

  .feature-tab {
    min-width: 190px;
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
    scroll-behavior: auto !important;
  }
}

/* roulang page: category1 */
:root {
  --bg: #05070F;
  --bg-deep: #04060D;
  --bg-panel: #0A1120;
  --bg-soft: #0D1528;
  --glass: rgba(16, 26, 52, 0.62);
  --glass-border: rgba(120, 175, 255, 0.22);
  --line: rgba(130, 165, 220, 0.16);
  --text: #EEF4FF;
  --text-sub: #B2C2E0;
  --text-weak: #7B8EB3;
  --primary: #2F6BFF;
  --primary-hover: #4A85FF;
  --cyan: #22D9D0;
  --orange: #FFAA5C;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.18);
  --shadow-md: 0 18px 50px rgba(0, 0, 0, 0.30);
  --container: 1240px;
  --font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    radial-gradient(420px 300px at 88% 8%, rgba(47, 107, 255, 0.10), transparent 70%),
    radial-gradient(420px 300px at -5% 18%, rgba(34, 217, 208, 0.06), transparent 70%);
  color: var(--text);
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
body.no-scroll { overflow: hidden; }
img { max-width: 100%; display: block; }
a {
  color: inherit;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0; }
button { font-family: inherit; cursor: pointer; }
.container { width: min(var(--container), 100% - 48px); margin-inline: auto; }

.section {
  padding-top: 96px;
  padding-bottom: 96px;
}
.section-tight {
  padding-top: 80px;
  padding-bottom: 80px;
}
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 36px;
}
.section-title {
  font-size: clamp(28px, 3.2vw, 40px);
  line-height: 1.3;
  font-weight: 650;
  letter-spacing: 0.5px;
  margin: 0 0 12px 0;
}
.section-sub {
  color: var(--text-sub);
  font-size: 16px;
  line-height: 1.8;
  max-width: 640px;
}
.section-rule {
  width: 42px;
  height: 3px;
  background: var(--cyan);
  border-radius: 99px;
  margin-top: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  transition: all .2s ease;
}
.btn:focus-visible,
.nav-toggle:focus-visible,
.nav-link:focus-visible,
a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, #2F6BFF, #2255E0);
  box-shadow: 0 8px 30px rgba(35, 80, 255, 0.35);
}
.btn-primary:hover {
  background: linear-gradient(180deg, #4A85FF, #2F6BFF);
  transform: translateY(-2px);
  box-shadow: 0 12px 34px rgba(47, 107, 255, 0.4);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 4px 16px rgba(35, 80, 255, 0.3);
}
.btn-cyan {
  color: #041014;
  background: linear-gradient(135deg, #18D6CF, #10A8B8);
  box-shadow: 0 0 26px rgba(34, 217, 208, 0.35);
}
.btn-cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(34, 217, 208, 0.36);
}
.btn-outline {
  color: rgba(238, 244, 255, 0.88);
  background: transparent;
  border-color: rgba(160, 190, 240, 0.28);
}
.btn-outline:hover {
  color: var(--cyan);
  border-color: rgba(34, 217, 208, 0.6);
  background: rgba(34, 217, 208, 0.06);
}
.btn-block { width: 100%; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 76px;
  background: rgba(6, 10, 20, 0.75);
  border-bottom: 1px solid rgba(130, 165, 220, 0.10);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.header-inner {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(34, 217, 208, 0.08);
  border: 1px solid rgba(34, 217, 208, 0.2);
}
.brand-mark svg { display: block; }
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-text strong {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.4px;
  color: var(--text);
}
.brand-text small {
  font-size: 11px;
  margin-top: 4px;
  color: var(--text-weak);
  letter-spacing: 0.6px;
}
.nav-menu-wrap {
  display: flex;
  align-items: center;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 42px;
  padding: 0 16px;
  border-radius: 10px;
  color: var(--text-sub);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  transition: all .2s ease;
}
.nav-link:hover {
  color: var(--text);
  background: rgba(34, 217, 208, 0.08);
}
.nav-link.is-active {
  color: var(--text);
  background: rgba(34, 217, 208, 0.08);
}
.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: -2px;
  height: 2px;
  border-radius: 99px;
  background: var(--cyan);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.header-actions .btn { min-height: 40px; padding: 0 18px; font-size: 14px; }
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: rgba(16, 26, 52, 0.6);
  border-radius: 10px;
  color: var(--text);
  align-items: center;
  justify-content: center;
}

/* Hero */
.page-hero {
  position: relative;
  padding: 170px 0 70px;
  overflow: hidden;
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--text-weak);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--text-weak); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb .sep { opacity: 0.6; }
.breadcrumb .current { color: var(--text-sub); }
.page-hero h1 {
  font-size: clamp(40px, 5.2vw, 62px);
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: 1px;
  margin: 0 0 20px 0;
}
.hero-lead {
  max-width: 760px;
  color: var(--text-sub);
  font-size: clamp(17px, 1.6vw, 19px);
  line-height: 1.9;
  margin-bottom: 24px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(34, 217, 208, 0.10);
  border: 1px solid rgba(34, 217, 208, 0.25);
  color: var(--cyan);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 22px;
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}

/* Split layout */
.version-main {
  background: var(--bg-panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  gap: 44px;
  align-items: stretch;
}
.visual-side {
  min-height: 380px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #0B1322;
  box-shadow: var(--shadow-md);
}
.visual-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
}
.visual-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 15, 0.08), rgba(5, 7, 15, 0.8));
}
.visual-card {
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 22px;
  border-radius: 18px;
  padding: 22px;
  background: rgba(16, 26, 52, 0.68);
  border: 1px solid rgba(120, 175, 255, 0.22);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
}
.visual-card .visual-tag {
  display: inline-flex;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  color: var(--cyan);
  border: 1px solid rgba(34, 217, 208, 0.28);
  background: rgba(34, 217, 208, 0.08);
  margin-bottom: 12px;
}
.visual-card h3 {
  font-size: 21px;
  line-height: 1.4;
  font-weight: 650;
  margin: 0 0 8px;
}
.visual-card p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}
.entry-list {
  display: flex;
  flex-direction: column;
}
.entry-block {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(130, 165, 220, 0.14);
}
.entry-block:first-child { padding-top: 0; }
.entry-block:last-child { border-bottom: 0; }
.entry-icon {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(120, 175, 255, 0.18);
  background: rgba(47, 107, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}
.entry-icon svg { width: 22px; height: 22px; }
.entry-body h4 {
  font-size: 17px;
  line-height: 1.4;
  font-weight: 600;
  margin: 0 0 6px;
}
.entry-body p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 12px;
}
.entry-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--cyan);
  transition: gap .2s ease;
}
.entry-link:hover { gap: 8px; }
.entry-list-foot {
  margin-top: 24px;
  padding: 14px 16px;
  font-size: 13px;
  color: var(--text-weak);
  background: rgba(16, 26, 52, 0.36);
  border: 1px dashed rgba(130, 165, 220, 0.22);
  border-radius: 12px;
}

/* Spec info */
.spec-grid {
  margin-top: 70px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--bg-soft);
}
.spec-cell {
  min-height: 156px;
  padding: 28px 32px;
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
}
.spec-cell:nth-child(odd) { border-left: 0; }
.spec-cell:nth-child(1),
.spec-cell:nth-child(2) { border-top: 0; }
.spec-cell .spec-mark {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(34, 217, 208, 0.5);
  margin-right: 8px;
}
.spec-title {
  display: flex;
  align-items: center;
  font-size: 14px;
  color: var(--text-weak);
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}
.spec-cell strong {
  display: block;
  font-size: 20px;
  font-weight: 650;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 6px;
}
.spec-cell p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* Channel info with coverpic */
.channel-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.channel-image-wrap {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.channel-image-wrap img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}
.channel-info h2 {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.4;
  font-weight: 650;
  margin: 0 0 14px;
}
.channel-info > p {
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 20px;
}
.channel-points li {
  position: relative;
  padding: 14px 0 14px 34px;
  border-bottom: 1px solid rgba(130, 165, 220, 0.12);
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.75;
}
.channel-points li::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 24px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}
.channel-points li strong { color: var(--text); font-weight: 550; }
.channel-note {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin-top: 22px;
  padding: 11px 16px;
  border-radius: 12px;
  border: 1px solid rgba(34, 217, 208, 0.22);
  background: rgba(34, 217, 208, 0.06);
  color: var(--cyan);
  font-size: 14px;
}

/* FAQ */
.faq-section {
  background: var(--bg-panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.6fr) minmax(0, 1.4fr);
  gap: 56px;
}
.faq-side .section-title { font-size: 30px; }
.faq-side .lead-muted {
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.8;
  margin-top: 14px;
}
.faq-accordion {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
}
.faq-item {
  border-bottom: 1px solid var(--line);
}
.faq-item:last-child { border-bottom: 0; }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  width: 100%;
  min-height: 64px;
  padding: 18px 24px;
  background: transparent;
  border: 0;
  color: var(--text);
  font-size: 15px;
  font-weight: 550;
  text-align: left;
  transition: background .2s ease;
}
.faq-question:hover { background: rgba(34, 217, 208, 0.06); }
.faq-icon {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.faq-icon span,
.faq-icon span::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
  transition: transform .3s ease;
}
.faq-icon span::after { transform: rotate(90deg); }
.faq-item.open .faq-icon span::after { transform: rotate(0deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .35s ease, opacity .3s ease, padding .3s ease;
}
.faq-item.open .faq-answer {
  padding: 0 24px 24px 24px;
  max-height: 240px;
  opacity: 1;
}
.faq-answer-content {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.85;
  border-left: 2px solid rgba(34, 217, 208, 0.3);
  padding-left: 16px;
}

/* CTA */
.cta-banner {
  border-radius: 22px;
  border: 1px solid rgba(120, 175, 255, 0.2);
  padding: 60px 48px;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(47, 107, 255, 0.2), rgba(34, 217, 208, 0.1)),
    url('/assets/images/backpic/back-2.png') center/cover;
}
.cta-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(5, 7, 15, 0.82), rgba(5, 7, 15, 0.45));
}
.cta-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
}
.cta-content h2 {
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.4;
  font-weight: 650;
  margin: 0 0 14px;
}
.cta-content p {
  color: rgba(238, 244, 255, 0.86);
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 28px;
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* Footer */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--line);
}
.footer-top {
  padding: 64px 0 44px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
  gap: 44px;
}
.footer-brand p {
  font-size: 13px;
  color: var(--text-weak);
  line-height: 1.8;
  margin-top: 16px;
  max-width: 300px;
}
.footer-title {
  font-size: 15px;
  color: var(--text);
  font-weight: 600;
  margin: 0 0 16px;
  letter-spacing: 0.4px;
}
.footer-grid ul li { margin-bottom: 10px; }
.footer-grid ul li a {
  color: var(--text-sub);
  font-size: 14px;
  transition: color .2s ease, padding-left .2s ease;
}
.footer-grid ul li a:hover {
  color: var(--cyan);
  padding-left: 4px;
}
.footer-contact p {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 12px;
}
.footer-bottom {
  padding: 18px 0;
  border-top: 1px solid rgba(130, 165, 220, 0.12);
  color: var(--text-weak);
  font-size: 13px;
}
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* responsive */
@media (max-width: 1024px) {
  .nav-menu-wrap {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: rgba(5, 7, 15, 0.98);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    display: none;
  }
  .nav-menu-wrap.open { display: block; }
  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 18px 24px 28px;
  }
  .nav-link { height: 48px; padding: 0 14px; justify-content: flex-start; }
  .nav-link.is-active::after { display: none; }
  .header-actions .btn-outline { display: none; }
  .nav-toggle {
    display: flex;
    margin-left: 8px;
  }
  .split-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .spec-grid { margin-top: 50px; }
  .channel-layout { grid-template-columns: 1fr; }
  .channel-image-wrap img { height: 340px; }
  .faq-layout { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
  .section { padding-top: 80px; padding-bottom: 80px; }
}
@media (max-width: 767px) {
  body { font-size: 15px; }
  .container { width: calc(100% - 32px); }
  .site-header,
  .header-inner { height: 62px; }
  .header-inner { gap: 12px; }
  .brand-text strong { font-size: 15px; }
  .brand-text small { font-size: 10px; }
  .brand-mark { width: 34px; height: 34px; }
  .nav-menu-wrap { top: 62px; }
  .header-actions .btn { min-height: 38px; padding: 0 14px; font-size: 13px; }
  .header-actions .btn-primary { padding: 0 12px; }
  .page-hero { padding: 120px 0 50px; }
  .hero-lead { font-size: 16px; }
  .section { padding-top: 60px; padding-bottom: 60px; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 10px; margin-bottom: 26px; }
  .spec-grid { grid-template-columns: 1fr; }
  .spec-cell { border: 0; border-top: 1px solid var(--line); }
  .spec-cell:first-child { border-top: 0; }
  .spec-cell:nth-child(even) { border-left: 0; }
  .visual-card { left: 14px; right: 14px; bottom: 14px; padding: 18px; }
  .channel-image-wrap img { height: 230px; }
  .faq-question { padding: 16px 18px; font-size: 14px; }
  .faq-answer-content { padding-left: 12px; }
  .faq-answer-content,
  .faq-answer { font-size: 14px; }
  .cta-banner { padding: 36px 22px; border-radius: 16px; }
  .cta-actions { flex-direction: column; align-items: stretch; }
  .footer-top { padding: 44px 0 30px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .page-hero h1 { font-size: 38px; }
  .entry-block { gap: 12px; }
  .entry-icon { flex-basis: 40px; width: 40px; height: 40px; }
}

/* roulang page: article */
:root {
  --bg: #05070F;
  --bg-deep: #04060D;
  --bg-panel: #0D1528;
  --bg-soft: #0A1120;
  --glass: rgba(16, 26, 52, 0.62);
  --glass-border: rgba(120, 175, 255, 0.22);
  --line: rgba(130, 165, 220, 0.16);
  --line-strong: rgba(150, 185, 245, 0.26);
  --text: #EEF4FF;
  --text-2: #B2C2E0;
  --text-3: #7B8EB3;
  --primary: #2F6BFF;
  --primary-bright: #4A85FF;
  --cyan: #22D9D0;
  --cyan-bg: rgba(34, 217, 208, 0.08);
  --orange: #FFAA5C;
  --radius-lg: 18px;
  --radius-sm: 12px;
  --font-main: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-num: "Bahnschrift", "DIN Alternate", "Roboto", sans-serif;
  --header-height: 76px;
  --shadow-1: 0 10px 30px rgba(0, 0, 0, 0.18);
  --shadow-2: 0 18px 50px rgba(0, 0, 0, 0.30);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: -160px;
  left: -160px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(47, 107, 255, 0.16), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  top: 30%;
  right: -220px;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(34, 217, 208, 0.10), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

img {
  max-width: 100%;
  display: block;
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

input,
button,
textarea {
  font-family: inherit;
}

button {
  cursor: pointer;
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #070C18;
}

::-webkit-scrollbar-thumb {
  background: #1E3356;
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: #2A4ManBetX;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: rgba(34, 217, 208, 0.1);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.2px;
}

.brand-text small {
  font-size: 11px;
  color: var(--text-3);
  font-weight: 400;
  letter-spacing: 0.3px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  border: 0;
  transition: transform .22s ease, background .22s ease, border-color .22s ease, box-shadow .22s ease, color .22s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(180deg, #2F6BFF 0%, #2255E0 100%);
  color: #fff;
  box-shadow: 0 8px 30px rgba(35, 80, 255, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #4A85FF 0%, #2960EE 100%);
  transform: translateY(-2px);
  box-shadow: 0 12px 38px rgba(35, 80, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 4px 16px rgba(35, 80, 255, 0.25);
}

.btn-cyan {
  background: linear-gradient(135deg, #18D6CF, #10A8B8);
  color: #041014;
  box-shadow: 0 0 26px rgba(34, 217, 208, 0.32);
}

.btn-cyan:hover {
  box-shadow: 0 0 34px rgba(34, 217, 208, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(160, 190, 240, 0.26);
  color: rgba(238, 244, 255, 0.86);
}

.btn-outline:hover {
  border-color: rgba(34, 217, 208, 0.55);
  color: var(--cyan);
  background: rgba(34, 217, 208, 0.06);
}

.btn-sm {
  min-height: 38px;
  padding: 8px 16px;
  font-size: 14px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 10, 20, 0.75);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(130, 165, 220, 0.12);
}

.header-inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-menu-wrap {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 15px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-2);
  border-radius: 999px;
  transition: background .24s ease, color .24s ease;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(34, 217, 208, 0.08);
}

.nav-link.is-active {
  background: rgba(34, 217, 208, 0.12);
  color: var(--text);
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: -3px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(34, 217, 208, 0.8);
}

.nav-link[data-slug="home"] .is-active::after {
  display: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.header-actions .btn {
  min-height: 42px;
  padding-left: 18px;
  padding-right: 18px;
  font-size: 14px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px solid rgba(130, 165, 220, 0.24);
  background: rgba(16, 26, 52, 0.5);
  color: var(--text);
}

.nav-toggle:hover {
  border-color: rgba(34, 217, 208, 0.4);
}

.nav-toggle[aria-expanded="true"] svg {
  transform: rotate(90deg);
}

.nav-toggle svg {
  transition: transform .22s ease;
}

.site-main {
  position: relative;
  z-index: 1;
  min-height: 70vh;
}

.page-banner {
  padding: 30px 0 18px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
  padding: 11px 16px;
  border: 1px solid rgba(130, 165, 220, 0.10);
  background: rgba(10, 17, 32, 0.54);
  border-radius: 999px;
  margin-bottom: 18px;
}

.breadcrumb-nav a {
  color: var(--text-2);
  transition: color .2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-nav a:hover {
  color: var(--cyan);
}

.breadcrumb-sep {
  opacity: .7;
  color: var(--text-3);
}

.breadcrumb-current {
  color: var(--text);
  max-width: 340px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  display: inline-block;
  vertical-align: bottom;
}

.article-hero {
  padding: 22px 0 36px;
}

.article-hero-inner {
  position: relative;
  border-radius: 22px;
  padding: 40px 44px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.035) 0%, transparent 60%),
    var(--bg-panel);
  border: 1px solid rgba(130, 165, 220, 0.16);
}

.article-hero-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 10%, rgba(47, 107, 255, 0.16), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(34, 217, 208, 0.10), transparent 45%);
  pointer-events: none;
}

.article-hero-content {
  position: relative;
  z-index: 1;
}

.article-category {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(34, 217, 208, 0.1);
  border: 1px solid rgba(34, 217, 208, 0.3);
  color: var(--cyan);
  height: 28px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.article-hero h1 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.5px;
  max-width: 920px;
  margin-bottom: 22px;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 28px;
  font-size: 14px;
  color: var(--text-3);
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.article-meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--text-3);
  opacity: .8;
}

.article-meta-divider {
  width: 1px;
  height: 18px;
  background: var(--line);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 322px;
  gap: 56px;
  align-items: start;
  padding: 16px 0 30px;
}

.article-main-col {
  min-width: 0;
  max-width: 840px;
}

.post-editor-area {
  background: rgba(13, 21, 40, 0.55);
  border: 1px solid rgba(130, 165, 220, 0.10);
  border-radius: 18px;
  padding: 42px 50px 50px;
  margin-bottom: 28px;
}

.article-body {
  max-width: 100%;
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--text-2);
  word-break: break-word;
}

.article-body > * + * {
  margin-top: 24px;
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
  color: var(--text);
  line-height: 1.5;
  font-weight: 700;
  margin-top: 44px;
}

.article-body h1 {
  font-size: 28px;
}

.article-body h2 {
  font-size: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(130, 165, 220, 0.10);
  position: relative;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--cyan), var(--primary));
  margin-right: 12px;
  vertical-align: -3px;
}

.article-body h3 {
  font-size: 20px;
  color: #D9E6FF;
}

.article-body h4 {
  font-size: 18px;
}

.article-body p {
  margin: 0;
}

.article-body strong {
  color: #E6EEFF;
}

.article-body em {
  color: var(--cyan);
  font-style: normal;
  font-weight: 500;
}

.article-body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color .2s;
}

.article-body a:hover {
  color: var(--primary-bright);
}

.article-body ul,
.article-body ol {
  padding-left: 1.3em;
  margin: 0;
}

.article-body ul li,
.article-body ol li {
  margin-top: 8px;
}

.article-body ul li::marker {
  color: var(--cyan);
}

.article-body ol li::marker {
  color: var(--cyan);
  font-family: var(--font-num);
  font-weight: 600;
}

.article-body blockquote {
  border-left: 3px solid var(--cyan);
  padding: 16px 22px;
  border-radius: 0 12px 12px 0;
  background: rgba(34, 217, 208, 0.06);
  color: var(--text-2);
}

.article-body img {
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-1);
  margin: 28px auto;
}

.article-body img + em {
  display: block;
  text-align: center;
  font-size: 13px;
  color: var(--text-3);
  margin-top: -14px;
}

.article-body figure {
  margin: 28px 0;
}

.article-body hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
  margin: 44px 0;
}

.article-body code {
  background: rgba(130, 165, 220, 0.12);
  color: #B9E8E6;
  padding: 2px 8px;
  border-radius: 6px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
}

.article-body pre {
  background: #081020;
  border: 1px solid rgba(130, 165, 220, 0.16);
  border-radius: 14px;
  padding: 20px;
  overflow-x: auto;
  color: #BFDBFE;
  line-height: 1.7;
}

.article-body pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 15px;
}

.article-body th,
.article-body td {
  border: 1px solid rgba(130, 165, 220, 0.16);
  padding: 12px 14px;
  text-align: left;
  color: var(--text-2);
}

.article-body th {
  background: rgba(47, 107, 255, 0.1);
  color: var(--text);
  font-weight: 600;
}

.article-body tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

.article-post-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 24px 0 0;
  padding-top: 24px;
  border-top: 1px solid rgba(130, 165, 220, 0.12);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(130, 165, 220, 0.06);
  border: 1px solid rgba(130, 165, 220, 0.18);
  color: var(--text-2);
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 12px;
  transition: border-color .2s, color .2s;
}

.tag:hover,
.tag.is-active {
  border-color: rgba(34, 217, 208, 0.5);
  background: rgba(34, 217, 208, 0.08);
  color: var(--cyan);
}

.article-side-col {
  position: sticky;
  top: 104px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

.side-card,
.side-panel {
  background: rgba(13, 21, 40, 0.76);
  border: 1px solid rgba(130, 165, 220, 0.12);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-1);
}

.side-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(130, 165, 220, 0.14);
  position: relative;
}

.side-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 36px;
  height: 2px;
  background: var(--cyan);
  border-radius: 3px;
}

.side-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.side-link-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-2);
  font-size: 14px;
  padding: 10px 12px;
  border-radius: 10px;
  transition: background .2s, color .2s, transform .2s;
}

.side-link-list a::before {
  content: "·";
  color: var(--cyan);
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  margin-right: 2px;
}

.side-link-list a:hover {
  background: rgba(34, 217, 208, 0.08);
  color: var(--text);
  transform: translateX(2px);
}

.side-download-card {
  background:
    linear-gradient(150deg, rgba(47, 107, 255, 0.18), transparent 55%),
    rgba(13, 21, 40, 0.82);
  border-color: rgba(47, 107, 255, 0.25);
}

.side-download-pic {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 17px;
}

.side-download-pic img {
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.side-download-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.side-download-card p {
  font-size: 14px;
  color: var(--text-3);
  margin-bottom: 16px;
}

.side-card .btn {
  width: 100%;
}

.related-section {
  margin-top: 26px;
  padding: 30px 50px 6px;
  background: rgba(13, 21, 40, 0.5);
  border: 1px solid rgba(130, 165, 220, 0.10);
  border-radius: 18px;
}

.related-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.related-head h2 {
  font-size: 21px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.related-head h2::before {
  content: "";
  width: 5px;
  height: 22px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--cyan), var(--primary));
}

.related-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-card {
  background: rgba(16, 26, 52, 0.6);
  border: 1px solid rgba(130, 165, 220, 0.14);
  border-radius: 14px;
  overflow: hidden;
  transition: transform .24s ease, border-color .24s ease, box-shadow .24s ease;
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 217, 208, 0.5);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
}

.related-card-pic {
  position: relative;
  aspect-ratio: 16 / 8.2;
  overflow: hidden;
  background: #0F1D38;
}

.related-card-pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}

.related-card:hover .related-card-pic img {
  transform: scale(1.05);
}

.related-card-pic::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 58%, rgba(5, 7, 15, 0.35));
  pointer-events: none;
}

.related-card-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 15px 17px 17px;
}

.related-card-label {
  display: inline-flex;
  width: fit-content;
  font-size: 11px;
  color: var(--cyan);
  background: rgba(34, 217, 208, 0.08);
  border: 1px solid rgba(34, 217, 208, 0.24);
  padding: 2px 10px;
  border-radius: 999px;
}

.related-card-title {
  font-size: 15px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.related-card-more {
  margin-top: 2px;
  font-size: 13px;
  color: var(--text-3);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: color .2s;
}

.related-card:hover .related-card-more {
  color: var(--cyan);
}

.related-back {
  margin-top: 24px;
  display: flex;
  justify-content: flex-start;
}

.page-feedback {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
  padding: 18px 24px;
  background: rgba(16, 26, 52, 0.44);
  border: 1px dashed rgba(130, 165, 220, 0.24);
  border-radius: 16px;
}

.feedback-title {
  color: var(--text-2);
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feedback-title::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(34, 217, 208, 0.8);
}

.feedback-btns {
  display: flex;
  align-items: center;
  gap: 10px;
}

.fb-btn {
  border: 1px solid rgba(130, 165, 220, 0.2);
  background: transparent;
  color: var(--text-2);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 13px;
  transition: all .2s;
  min-height: 36px;
}

.fb-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(34, 217, 208, 0.06);
}

.fb-btn.is-active {
  border-color: var(--cyan);
  background: rgba(34, 217, 208, 0.12);
  color: var(--cyan);
}

.feedback-tip {
  font-size: 13px;
  color: var(--text-3);
  width: 100%;
  display: none;
  margin-top: 8px;
}

.feedback-tip.show {
  display: block;
}

.article-unavailable {
  padding: 80px 24px 90px;
  display: flex;
  justify-content: center;
}

.empty-box {
  max-width: 720px;
  width: 100%;
  padding: 56px 40px;
  text-align: center;
  border: 1px dashed rgba(130, 165, 220, 0.25);
  border-radius: 300px;
}

.empty-box h1 {
  font-size: 30px;
  color: var(--text);
  margin-bottom: 14px;
}

.empty-box h1 span {
  color: var(--cyan);
}

.empty-box p {
  color: var(--text-3);
  font-size: 15px;
  margin-bottom: 28px;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(130, 165, 220, 0.1);
  margin-top: 40px;
  position: relative;
  z-index: 1;
}

.footer-top {
  padding: 60px 0 38px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 44px;
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--text-3);
  font-size: 14px;
  line-height: 1.9;
  max-width: 300px;
}

.footer-title {
  font-size: 16px;
  color: #D8E4FA;
  font-weight: 600;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 1px;
  background: var(--cyan);
}

.footer-grid ul {
  list-style: none;
}

.footer-grid ul li {
  margin-bottom: 10px;
}

.footer-grid ul a {
  color: var(--text-3);
  font-size: 14px;
  transition: color .22s, padding-left .22s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-grid ul a:hover {
  color: var(--cyan);
  padding-left: 6px;
}

.footer-contact p {
  color: var(--text-3);
  font-size: 14px;
  margin-bottom: 8px;
  display: flex;
  gap: 8px;
}

.footer-contact p::before {
  content: "›";
  color: var(--cyan);
  font-weight: 700;
}

.footer-bottom {
  border-top: 1px solid rgba(130, 165, 220, 0.08);
  padding: 22px 0;
}

.footer-bottom span {
  color: var(--text-3);
  font-size: 13px;
  line-height: 1.8;
}

@media (max-width: 1199px) {
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }

  .header-inner {
    gap: 12px;
  }

  .brand-text strong {
    font-size: 17px;
  }

  .nav-link {
    padding-left: 11px;
    padding-right: 11px;
    font-size: 14px;
  }

  .article-layout {
    gap: 32px;
    grid-template-columns: minmax(0, 1fr) 280px;
  }

  .article-side-col {
    top: 96px;
  }
}

@media (max-width: 1023px) {
  :root {
    --header-height: 62px;
  }

  .nav-menu-wrap {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: var(--header-height);
    background: #08101f;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    padding: 12px 20px 22px;
    justify-content: flex-start;
  }

  .nav-menu-wrap.open {
    display: flex;
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .nav-link {
    justify-content: flex-start;
    height: 46px;
    min-height: 46px;
    padding-left: 16px;
    border-radius: 10px;
  }

  .nav-link.is-active {
    background: rgba(34, 217, 208, 0.1);
  }

  .nav-link.is-active::after {
    left: 16px;
    right: auto;
    width: 24px;
    bottom: 8px;
  }

  .header-actions > .btn-outline {
    display: none;
  }

  .header-actions .btn {
    min-height: 40px;
    padding: 8px 14px;
    font-size: 13px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-side-col {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .post-editor-area {
    padding: 34px 28px;
  }

  .related-section {
    padding-left: 28px;
    padding-right: 28px;
  }

  .related-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }

  .related-card-info {
    padding: 12px;
  }

  .related-card-title {
    font-size: 14px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 767px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand-text strong {
    font-size: 16px;
    letter-spacing: 0.2px;
  }

  .brand-text small {
    font-size: 10px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .header-actions .btn {
    display: none;
  }

  .header-inner {
    justify-content: space-between;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .article-hero-inner {
    padding: 30px 22px;
    border-radius: 16px;
  }

  .article-hero h1 {
    font-size: 29px;
  }

  .article-meta {
    gap: 10px 16px;
    font-size: 13px;
  }

  .article-meta-divider {
    height: 14px;
  }

  .post-editor-area {
    padding: 24px 18px;
  }

  .article-body {
    font-size: 16px;
    line-height: 1.9;
  }

  .article-body > * + * {
    margin-top: 20px;
  }

  .article-body h1,
  .article-body h2,
  .article-body h3,
  .article-body h4 {
    margin-top: 36px;
  }

  .article-body h2 {
    font-size: 21px;
  }

  .article-body h3 {
    font-size: 18px;
  }

  .article-side-col {
    grid-template-columns: 1fr;
  }

  .related-cards {
    grid-template-columns: 1fr;
  }

  .related-section {
    padding: 24px 20px 8px;
  }

  .page-feedback {
    flex-direction: column;
    align-items: flex-start;
  }

  .feedback-btns {
    width: 100%;
  }

  .fb-btn {
    flex: 1;
    justify-content: center;
    text-align: center;
  }

  .breadcrumb-nav {
    border-radius: 14px;
    font-size: 12px;
    padding: 10px 12px;
  }

  .page-banner {
    padding-top: 12px;
  }

  .article-hero {
    padding-top: 12px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-top {
    padding: 42px 0 30px;
  }

  .empty-box {
    padding: 40px 16px;
  }
}

@media (max-width: 480px) {
  .brand-text small {
    display: none;
  }

  .article-meta-item:nth-child(3) {
    display: none;
  }

  .empty-box h1 {
    font-size: 24px;
  }
}

/* roulang page: category3 */
:root {
            --bg: #05070F;
            --bg2: #0A1120;
            --bg3: #0D1528;
            --glass: rgba(16, 26, 52, 0.62);
            --glass-border: rgba(120, 175, 255, 0.22);
            --stroke: rgba(130, 165, 220, 0.16);
            --line: rgba(130, 165, 220, 0.12);
            --text: #EEF4FF;
            --text2: #B2C2E0;
            --text3: #7B8EB3;
            --brand: #2F6BFF;
            --brand2: #4A85FF;
            --ice: #22D9D0;
            --warm: #FFAA5C;
            --radius-card: 18px;
            --radius-md: 12px;
            --radius-pill: 999px;
            --shadow-1: 0 10px 30px rgba(0, 0, 0, 0.18);
            --shadow-2: 0 18px 50px rgba(0, 0, 0, 0.30);
            --font-main: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            --font-en: "Bahnschrift", "DIN Alternate", "Roboto", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background: var(--bg);
            color: var(--text);
            font-family: var(--font-main);
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        ul,
        ol {
            list-style: none;
        }
        img {
            display: block;
            max-width: 100%;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            background: none;
            border: none;
        }
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 48px;
            padding: 0 28px;
            border-radius: 12px;
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            transition: all .24s ease;
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: linear-gradient(180deg, #2F6BFF, #2255E0);
            box-shadow: 0 8px 30px rgba(35, 80, 255, 0.35);
            color: #fff;
        }
        .btn-primary:hover {
            background: linear-gradient(180deg, #4A85FF, #2F6BFF);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(47, 107, 255, 0.4);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 4px 14px rgba(35, 80, 255, 0.3);
        }
        .btn-outline {
            border-color: rgba(160, 190, 240, 0.28);
            color: rgba(255, 255, 255, 0.85);
            background: transparent;
        }
        .btn-outline:hover {
            border-color: rgba(34, 217, 208, 0.8);
            color: var(--ice);
            background: rgba(34, 217, 208, 0.06);
            transform: translateY(-2px);
        }
        .btn-ice {
            background: linear-gradient(135deg, #18D6CF, #10A8B8);
            color: #041014;
            box-shadow: 0 0 26px rgba(34, 217, 208, 0.3);
        }
        .btn-ice:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 36px rgba(34, 217, 208, 0.45);
        }
        .btn-ice:active {
            transform: translateY(0);
            box-shadow: 0 0 18px rgba(34, 217, 208, 0.25);
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(6, 10, 20, 0.68);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid transparent;
            transition: background .3s ease, border-color .3s ease, box-shadow .3s ease;
        }
        .site-header.is-scrolled {
            background: rgba(5, 8, 16, 0.9);
            border-bottom-color: var(--line);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
        }
        .header-inner {
            display: flex;
            align-items: center;
            gap: 28px;
            min-height: 76px;
            flex-wrap: wrap;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .brand-mark {
            width: 36px;
            height: 36px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .brand-mark svg {
            width: 100%;
            height: 100%;
        }
        .brand-text {
            display: flex;
            flex-direction: column;
            line-height: 1.3;
            min-width: 0;
        }
        .brand-text strong {
            font-size: 18px;
            font-weight: 700;
            letter-spacing: 0.2px;
            color: #fff;
        }
        .brand-text small {
            font-size: 11px;
            color: var(--text3);
            letter-spacing: 0.6px;
            margin-top: 2px;
        }
        .nav-menu-wrap {
            flex: 1;
            display: flex;
            justify-content: center;
            min-width: 0;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-link {
            padding: 9px 15px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text2);
            transition: background .2s ease, color .2s ease;
            position: relative;
        }
        .nav-link:hover {
            color: #fff;
            background: rgba(34, 217, 208, 0.08);
        }
        .nav-link.is-active {
            color: #fff;
        }
        .nav-link.is-active::after {
            content: "";
            position: absolute;
            left: 15px;
            right: 15px;
            bottom: 2px;
            height: 2px;
            border-radius: 4px;
            background: var(--ice);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .header-actions .btn {
            min-height: 42px;
            padding: 0 22px;
            font-size: 14px;
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            color: var(--text);
            border-radius: 10px;
            background: rgba(130, 165, 220, 0.08);
            border: 1px solid var(--line);
            transition: background .2s ease, border-color .2s ease;
        }
        .nav-toggle:hover {
            border-color: rgba(34, 217, 208, 0.5);
            color: var(--ice);
        }
        .page-hero {
            position: relative;
            padding: 74px 0 78px;
            overflow: hidden;
            background: var(--bg);
        }
        .page-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            pointer-events: none;
            background:
                radial-gradient(760px 360px at 88% 0%, rgba(34, 217, 208, 0.12), transparent 60%),
                radial-gradient(700px 380px at 0% 80%, rgba(47, 107, 255, 0.20), transparent 60%);
        }
        .page-hero-bg {
            position: absolute;
            inset: 0;
            opacity: 0.35;
            background-image: linear-gradient(90deg, rgba(5, 7, 15, 0.7), rgba(5, 7, 15, 0.2)), url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center right;
            pointer-events: none;
        }
        .page-hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.25fr 0.85fr;
            gap: 56px;
            align-items: center;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text3);
            margin-bottom: 24px;
        }
        .breadcrumb a {
            color: var(--text3);
            transition: color .2s ease;
        }
        .breadcrumb a:hover {
            color: var(--ice);
        }
        .breadcrumb .sep {
            color: rgba(130, 165, 220, 0.45);
        }
        .breadcrumb span[aria-current="page"] {
            color: var(--text2);
            font-weight: 500;
        }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 1px;
            color: var(--ice);
            margin-bottom: 14px;
            background: rgba(34, 217, 208, 0.08);
            border: 1px solid rgba(34, 217, 208, 0.18);
            padding: 6px 14px;
            border-radius: var(--radius-pill);
        }
        .eyebrow::before {
            content: "";
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--ice);
            box-shadow: 0 0 12px rgba(34, 217, 208, 0.8);
        }
        .page-hero h1 {
            font-size: 54px;
            line-height: 1.14;
            font-weight: 700;
            letter-spacing: 1px;
            color: #fff;
            margin-bottom: 22px;
        }
        .page-hero-lead {
            max-width: 650px;
            font-size: 17px;
            line-height: 1.85;
            color: var(--text2);
            margin-bottom: 28px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .hero-visual {
            position: relative;
        }
        .hero-shot {
            border-radius: 22px;
            position: relative;
            border: 1px solid rgba(255, 255, 255, 0.08);
            background: var(--bg2);
            box-shadow: var(--shadow-2);
            overflow: hidden;
        }
        .hero-shot::after {
            content: "";
            position: absolute;
            inset: 0;
            border-radius: 22px;
            border: 1px solid rgba(255, 255, 255, 0.04);
            pointer-events: none;
        }
        .hero-shot img {
            width: 100%;
            height: auto;
            object-fit: cover;
            max-height: 400px;
        }
        .hero-shot-meta {
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 14px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 12px 18px;
            border-radius: 16px;
            background: rgba(10, 15, 28, 0.76);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(120, 175, 255, 0.18);
            color: var(--text2);
            font-size: 13px;
        }
        .hero-shot-meta strong {
            color: #fff;
            font-size: 14px;
        }
        .hero-float-chip {
            position: absolute;
            top: 222px;
            right: -24px;
            border-radius: 999px;
            background: rgba(13, 21, 40, 0.82);
            backdrop-filter: blur(14px);
            border: 1px solid rgba(120, 175, 255, 0.22);
            color: #fff;
            padding: 10px 18px;
            font-size: 13px;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: var(--shadow-1);
        }
        .floating-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--ice);
            box-shadow: 0 0 12px rgba(34, 217, 208, 0.8);
        }
        @media (max-width: 1080px) {
            .hero-float-chip {
                right: 12px;
            }
            .page-hero-inner {
                grid-template-columns: 1fr;
                gap: 38px;
            }
            .page-hero {
                padding-top: 56px;
                padding-bottom: 56px;
            }
            .hero-visual {
                max-width: 640px;
            }
        }
        .section {
            padding-top: 92px;
            padding-bottom: 92px;
        }
        .section-head {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            gap: 40px;
            margin-bottom: 40px;
        }
        .section-title-line {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .section-index {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 14px;
            border: 1px solid rgba(34, 217, 208, 0.2);
            background: rgba(34, 217, 208, 0.06);
            color: var(--ice);
            font-family: var(--font-en);
            font-size: 14px;
            font-weight: 600;
            flex-shrink: 0;
        }
        .section-title {
            font-size: 34px;
            line-height: 1.3;
            color: #fff;
            font-weight: 650;
            letter-spacing: 0.5px;
        }
        .section-desc {
            font-size: 15px;
            color: var(--text3);
            line-height: 1.7;
            max-width: 320px;
            text-align: right;
        }
        .section-title-divider {
            width: 56px;
            height: 3px;
            border-radius: 8px;
            background: linear-gradient(90deg, var(--ice), transparent);
            margin-top: 14px;
        }
        .spec-overview {
            background: var(--bg2);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }
        .spec-hero-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            margin-bottom: 42px;
            background: rgba(6, 11, 22, 0.52);
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            overflow: hidden;
        }
        .spec-mini {
            padding: 22px 24px;
            border-right: 1px solid var(--line);
        }
        .spec-mini:last-child {
            border-right: none;
        }
        .spec-mini span {
            font-size: 13px;
            color: var(--text3);
            display: block;
            margin-bottom: 6px;
        }
        .spec-mini strong {
            display: block;
            color: #fff;
            font-size: 17px;
            font-weight: 600;
            line-height: 1.4;
        }
        .spec-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .spec-panel-block {
            border: 1px solid var(--stroke);
            border-radius: var(--radius-card);
            background: linear-gradient(180deg, rgba(16, 26, 52, 0.42), rgba(10, 16, 32, 0.6));
            padding: 28px;
            box-shadow: var(--shadow-1);
        }
        .spec-panel-title {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 18px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--line);
        }
        .spec-panel-title img {
            width: 44px;
            height: 44px;
            object-fit: cover;
            border-radius: 12px;
        }
        .spec-panel-title span {
            font-size: 18px;
        }
        .spec-list {
            display: flex;
            flex-direction: column;
        }
        .spec-list-item {
            display: flex;
            align-items: flex-start;
            gap: 24px;
            padding: 14px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }
        .spec-list-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }
        .spec-list-label {
            width: 88px;
            flex-shrink: 0;
            font-size: 14px;
            color: var(--text3);
        }
        .spec-list-value {
            color: var(--text2);
            font-size: 14px;
            line-height: 1.8;
        }
        .spec-list-value strong {
            color: #fff;
            font-weight: 500;
        }
        .platform-section {
            background: var(--bg);
        }
        .platform-stack {
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            background: rgba(10, 17, 32, 0.42);
            overflow: hidden;
        }
        .platform-item {
            display: grid;
            grid-template-columns: 190px 1fr 140px;
            gap: 28px;
            align-items: start;
            padding: 26px 28px;
            border-bottom: 1px solid var(--line);
            transition: background .25s ease;
        }
        .platform-item:last-child {
            border-bottom: none;
        }
        .platform-item:hover {
            background: rgba(34, 217, 208, 0.02);
        }
        .platform-side {
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .platform-ic {
            width: 46px;
            height: 46px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 14px;
            font-family: var(--font-en);
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            background: rgba(47, 107, 255, 0.14);
            border: 1px solid rgba(47, 107, 255, 0.26);
        }
        .platform-ic.ic-mac {
            background: rgba(34, 217, 208, 0.1);
            border-color: rgba(34, 217, 208, 0.2);
            color: var(--ice);
        }
        .platform-ic.ic-android {
            background: rgba(122, 203, 92, 0.08);
            border-color: rgba(122, 203, 92, 0.2);
            color: #A8EC86;
        }
        .platform-ic.ic-ios {
            background: rgba(160, 190, 240, 0.08);
            border-color: rgba(160, 190, 240, 0.2);
            color: #d4e2ff;
        }
        .platform-name h4 {
            font-size: 17px;
            color: #fff;
            font-weight: 600;
        }
        .platform-name p {
            font-size: 13px;
            color: var(--text3);
            margin-top: 4px;
        }
        .platform-desc ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
            font-size: 14px;
            color: var(--text2);
            line-height: 1.8;
        }
        .platform-desc li strong {
            color: #fff;
            font-weight: 600;
            margin-right: 4px;
        }
        .platform-status {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            align-self: flex-start;
            border-radius: var(--radius-pill);
            background: rgba(34, 217, 208, 0.08);
            border: 1px solid rgba(34, 217, 208, 0.18);
            color: var(--ice);
            font-size: 13px;
            padding: 5px 12px;
        }
        .timeline-area {
            background: var(--bg2);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }
        .timeline-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 300px;
            gap: 40px;
            align-items: start;
        }
        .version-stack {
            position: relative;
        }
        .version-item {
            display: grid;
            grid-template-columns: 190px minmax(0, 1fr);
            gap: 32px;
            border-bottom: 1px solid var(--line);
            padding: 26px 4px;
        }
        .version-item:hover {
            background: rgba(34, 217, 208, 0.02);
        }
        .version-meta {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .version-tag {
            display: inline-flex;
            align-items: center;
            align-self: flex-start;
            color: #fff;
            font-family: var(--font-en);
            font-weight: 600;
            font-size: 16px;
            letter-spacing: 0.4px;
            background: rgba(47, 107, 255, 0.2);
            border: 1px solid rgba(47, 107, 255, 0.28);
            border-radius: 10px;
            padding: 6px 12px;
        }
        .version-date {
            font-size: 13px;
            color: var(--text3);
            font-family: var(--font-en);
        }
        .version-body h3 {
            font-size: 18px;
            color: #fff;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .version-feats {
            margin-bottom: 10px;
        }
        .version-feats li {
            position: relative;
            padding-left: 18px;
            color: var(--text2);
            font-size: 14px;
            line-height: 1.9;
        }
        .version-feats li::before {
            content: "";
            position: absolute;
            left: 2px;
            top: 13px;
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--ice);
            opacity: 0.8;
        }
        .version-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .version-tags span {
            font-size: 12px;
            color: var(--brand2);
            background: rgba(130, 165, 220, 0.06);
            border: 1px solid rgba(130, 165, 220, 0.12);
            border-radius: var(--radius-pill);
            padding: 4px 10px;
        }
        .timeline-side {
            position: sticky;
            top: 104px;
        }
        .side-box {
            border: 1px solid var(--stroke);
            background: rgba(13, 21, 40, 0.68);
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-1);
        }
        .side-box .side-title {
            font-size: 17px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            padding-bottom: 14px;
            border-bottom: 1px solid var(--line);
        }
        .side-box a.side-link {
            display: block;
            color: var(--text2);
            font-size: 14px;
            padding: 10px 12px;
            border-radius: 10px;
            border-left: 2px solid transparent;
            transition: color .2s ease, background .2s ease, border-color .2s ease;
        }
        .side-box a.side-link:hover {
            color: var(--ice);
            background: rgba(34, 217, 208, 0.06);
            border-left-color: var(--ice);
        }
        .side-note {
            margin-top: 20px;
            padding: 16px;
            background: rgba(47, 107, 255, 0.08);
            border: 1px solid rgba(47, 107, 255, 0.18);
            border-radius: 12px;
            font-size: 13px;
            color: var(--text2);
            line-height: 1.8;
        }
        .side-action {
            margin-top: 14px;
        }
        .side-action .btn {
            width: 100%;
        }
        @media (max-width: 1080px) {
            .timeline-layout {
                grid-template-columns: 1fr;
            }
            .timeline-side {
                position: static;
                order: -1;
            }
            .side-box {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 8px 24px;
            }
            .side-box .side-title {
                grid-column: 1/-1;
            }
            .side-note,
            .side-action {
                grid-column: 1/-1;
            }
        }
        .faq-section {
            background: var(--bg);
        }
        .faq-panel {
            max-width: 920px;
            border: 1px solid var(--line);
            background: var(--bg3);
            border-radius: var(--radius-card);
            overflow: hidden;
            padding: 0 18px;
        }
        .faq-item {
            border-bottom: 1px solid rgba(130, 165, 220, 0.14);
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        details.faq-item {
            position: relative;
        }
        details.faq-item summary::-webkit-details-marker {
            display: none;
        }
        details.faq-item summary {
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            min-height: 58px;
            padding: 14px 0;
            cursor: pointer;
            border-radius: 8px;
            transition: color .2s ease;
        }
        details.faq-item summary:hover {
            color: var(--ice);
        }
        .faq-title {
            font-size: 16px;
            font-weight: 500;
            color: #fff;
            line-height: 1.6;
            transition: color .2s ease;
        }
        details.faq-item summary:hover .faq-title {
            color: var(--ice);
        }
        .faq-plus {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(34, 217, 208, 0.08);
            border: 1px solid rgba(34, 217, 208, 0.26);
            color: var(--ice);
            flex-shrink: 0;
            transition: transform .3s cubic-bezier(.2, .7, .3, 1), background .2s ease;
        }
        .faq-plus svg {
            width: 16px;
            height: 16px;
            transition: transform .3s ease;
        }
        details[open] .faq-plus svg {
            transform: rotate(45deg);
        }
        details[open] .faq-plus {
            background: rgba(34, 217, 208, 0.16);
        }
        .faq-content {
            padding: 0 0 22px;
            max-width: 820px;
        }
        .faq-content p {
            font-size: 15px;
            line-height: 1.9;
            color: var(--text2);
        }
        .cta-band {
            background: var(--bg2);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
            position: relative;
            overflow: hidden;
            padding: 72px 0;
        }
        .cta-band::before {
            content: "";
            position: absolute;
            width: 440px;
            height: 440px;
            left: 10%;
            top: -200px;
            border-radius: 50%;
            background: rgba(34, 217, 208, 0.08);
            filter: blur(90px);
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 48px;
        }
        .cta-copy h2 {
            font-size: 30px;
            font-weight: 650;
            color: #fff;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .cta-copy h2 strong {
            color: var(--ice);
            font-weight: 650;
        }
        .cta-copy p {
            font-size: 15px;
            color: var(--text2);
            max-width: 620px;
        }
        .cta-btns {
            display: flex;
            gap: 14px;
            flex-shrink: 0;
            flex-wrap: wrap;
        }
        .site-footer {
            background: #04060D;
            border-top: 1px solid var(--line);
        }
        .footer-top {
            padding: 56px 0 46px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 44px;
        }
        .footer-brand .brand {
            margin-bottom: 16px;
        }
        .footer-brand>p {
            color: var(--text3);
            font-size: 14px;
            line-height: 1.9;
            max-width: 300px;
        }
        .footer-title {
            font-size: 15px;
            color: #fff;
            font-weight: 600;
            margin-bottom: 14px;
        }
        .footer-top ul {
            display: flex;
            flex-direction: column;
            gap: 11px;
        }
        .footer-top ul a {
            color: var(--text3);
            font-size: 14px;
            transition: color .2s ease;
        }
        .footer-top ul a:hover {
            color: var(--ice);
        }
        .footer-contact {
            color: var(--text3);
            font-size: 14px;
            line-height: 1.9;
        }
        .footer-bottom {
            border-top: 1px solid rgba(130, 165, 220, 0.1);
            padding: 20px 0;
            color: var(--text3);
            font-size: 13px;
        }
        .footer-bottom-inner {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }
        .text-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 500;
            color: var(--ice);
            transition: color .2s ease;
        }
        .text-link:hover {
            color: #fff;
        }
        a:focus-visible,
        button:focus-visible,
        summary:focus-visible {
            outline: 2px solid var(--brand2);
            outline-offset: 3px;
            border-radius: 6px;
        }
        @media (max-width: 1199px) {
            .header-inner {
                gap: 20px;
            }
            .nav-menu-wrap {
                justify-content: flex-end;
            }
            .nav-link {
                padding-left: 12px;
                padding-right: 12px;
            }
        }
        @media (max-width: 1024px) {
            .section {
                padding-top: 76px;
                padding-bottom: 76px;
            }
            .section-title {
                font-size: 30px;
            }
            .spec-grid {
                grid-template-columns: 1fr;
            }
            .platform-item {
                grid-template-columns: 170px 1fr;
                gap: 20px;
            }
            .platform-status {
                grid-column: 1 / -1;
                justify-self: start;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 900px) {
            .nav-menu-wrap {
                position: fixed;
                top: 76px;
                left: 0;
                right: 0;
                background: rgba(4, 6, 13, 0.98);
                border-bottom: 1px solid var(--line);
                padding: 18px 20px 26px;
                display: flex;
                justify-content: flex-start;
                flex-direction: column;
                gap: 10px;
                opacity: 0;
                visibility: hidden;
                transform: translateY(-10px);
                transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
            }
            .nav-menu-wrap.nav-open {
                opacity: 1;
                visibility: visible;
                transform: translateY(0);
            }
            .nav-menu {
                flex-direction: column;
                align-items: stretch;
                gap: 8px;
                width: 100%;
            }
            .nav-link {
                display: block;
                padding: 13px 16px;
                font-size: 16px;
            }
            .nav-link.is-active::after {
                display: none;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .header-actions .btn-outline {
                display: none;
            }
            .header-actions .btn {
                min-height: 40px;
                padding: 0 18px;
            }
        }
        @media (max-width: 768px) {
            .site-header {
                position: sticky;
            }
            .header-inner {
                min-height: 64px;
            }
            .page-hero {
                padding: 46px 0 50px;
            }
            .page-hero h1 {
                font-size: 40px;
            }
            .section {
                padding-top: 62px;
                padding-bottom: 62px;
            }
            .section-head {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                margin-bottom: 28px;
            }
            .section-desc {
                text-align: left;
                max-width: 100%;
            }
            .spec-hero-list {
                grid-template-columns: 1fr 1fr;
            }
            .spec-mini {
                border-bottom: 1px solid var(--line);
            }
            .spec-mini:nth-child(2n) {
                border-right: none;
            }
            .spec-mini:nth-child(3) {
                border-bottom: none;
            }
            .spec-mini:nth-child(4) {
                border-bottom: none;
            }
            .spec-panel-block {
                padding: 20px;
            }
            .platform-item {
                grid-template-columns: 1fr;
                padding: 22px 20px;
                gap: 16px;
            }
            .platform-side {
                align-items: flex-start;
            }
            .version-item {
                grid-template-columns: 1fr;
                gap: 14px;
                padding: 22px 0;
            }
            .version-meta {
                flex-direction: row;
                align-items: center;
                flex-wrap: wrap;
                gap: 12px;
            }
            .version-date {
                margin-left: 2px;
            }
            .faq-panel {
                padding: 0 16px;
            }
            .cta-inner {
                flex-direction: column;
                text-align: left;
                gap: 28px;
                align-items: flex-start;
            }
            .cta-copy h2 {
                font-size: 24px;
            }
            .cta-btns {
                width: 100%;
            }
            .cta-btns .btn {
                flex: 1;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 18px;
                padding-right: 18px;
            }
            .page-hero h1 {
                font-size: 34px;
            }
            .page-hero-lead {
                font-size: 15px;
            }
            .section-title {
                font-size: 27px;
            }
            .hero-actions,
            .cta-btns {
                flex-direction: column;
            }
            .hero-actions .btn,
            .cta-btns .btn {
                width: 100%;
            }
            .spec-hero-list {
                grid-template-columns: 1fr;
            }
            .spec-mini {
                border-right: 0;
                border-bottom: 1px solid var(--line);
            }
            .spec-mini:nth-child(3) {
                border-bottom: 1px solid var(--line);
            }
            .spec-mini:last-child {
                border-bottom: none;
            }
            .timeline-side .side-box {
                display: flex;
                flex-wrap: wrap;
                gap: 6px;
                padding: 18px;
            }
            .side-box .side-title {
                width: 100%;
            }
            .side-box a.side-link {
                width: 48%;
                flex: 0 0 auto;
                padding: 10px 10px;
                border-left: 2px solid rgba(34, 217, 208, 0.2);
                margin: 2px 0;
            }
            .side-note,
            .side-action {
                width: 100%;
            }
            .footer-bottom-inner {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .brand-text strong {
                font-size: 16px;
            }
            .header-actions .btn {
                display: none;
            }
            .nav-toggle {
                display: inline-flex;
            }
        }

/* roulang page: category2 */
:root {
      --bg: #05070F;
      --bg-elev: #0A1120;
      --bg-soft: #0D1528;
      --glass: rgba(16, 26, 52, 0.62);
      --glass-border: rgba(120, 175, 255, 0.22);
      --divider: rgba(130, 165, 220, 0.16);
      --text: #EEF4FF;
      --text-sub: #B2C2E0;
      --text-weak: #7B8EB3;
      --primary: #2F6BFF;
      --primary-hover: #4A85FF;
      --cyan: #22D9D0;
      --orange: #FFAA5C;
      --radius-lg: 22px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.18);
      --shadow-md: 0 18px 50px rgba(0, 0, 0, 0.30);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      background: var(--bg);
      color: var(--text);
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

    body,
    h1,
    h2,
    h3,
    p,
    ul,
    ol,
    blockquote,
    pre {
      margin: 0;
    }

    ul,
    ol {
      padding: 0;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      display: block;
      max-width: 100%;
      border: 0;
    }

    button {
      border: 0;
      background: none;
      font: inherit;
      color: inherit;
      cursor: pointer;
    }

    section[id],
    [id] {
      scroll-margin-top: 96px;
    }

    .container {
      width: min(1240px, 100% - 64px);
      margin: 0 auto;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 12px 24px;
      border-radius: 12px;
      font-size: 15px;
      font-weight: 600;
      line-height: 1.2;
      border: 1px solid transparent;
      transition: color .22s, background .22s, border-color .22s, box-shadow .22s, transform .2s;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(180deg, #2F6BFF, #2255E0);
      color: #FFFFFF;
      box-shadow: 0 8px 30px rgba(35, 80, 255, 0.32);
    }

    .btn-primary:hover {
      background: linear-gradient(180deg, #4A85FF, #2F6BFF);
      transform: translateY(-2px);
      box-shadow: 0 12px 36px rgba(35, 80, 255, 0.42);
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.02);
      border-color: rgba(160, 190, 240, 0.28);
      color: rgba(238, 244, 255, 0.9);
    }

    .btn-outline:hover {
      border-color: rgba(34, 217, 208, 0.58);
      color: #22D9D0;
      background: rgba(34, 217, 208, 0.06);
      transform: translateY(-2px);
    }

    .btn-primary:active,
    .btn-outline:active {
      transform: translateY(1px);
    }

    .btn:focus-visible,
    a:focus-visible {
      outline: 2px solid rgba(34, 217, 208, 0.65);
      outline-offset: 3px;
    }

    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 76px;
      background: rgba(6, 10, 20, 0.78);
      backdrop-filter: saturate(120%) blur(18px);
      -webkit-backdrop-filter: saturate(120%) blur(18px);
      border-bottom: 1px solid rgba(120, 175, 255, 0.1);
    }

    .header-inner {
      height: 76px;
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .brand-mark {
      display: flex;
      justify-content: center;
      align-items: center;
      filter: drop-shadow(0 0 12px rgba(34, 217, 208, 0.34));
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.15;
      min-width: 0;
    }

    .brand-text strong {
      font-size: 18px;
      font-weight: 700;
      letter-spacing: 0.2px;
      color: #FFFFFF;
      white-space: nowrap;
    }

    .brand-text small {
      margin-top: 4px;
      font-size: 11px;
      color: rgba(178, 194, 224, 0.75);
      letter-spacing: 0.6px;
      white-space: nowrap;
    }

    .brand:hover .brand-text strong {
      color: #22D9D0;
    }

    .nav-menu-wrap {
      margin-left: auto;
      margin-right: auto;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .nav-link {
      position: relative;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 40px;
      padding: 8px 17px;
      border-radius: 10px;
      color: var(--text-sub);
      font-size: 15px;
      font-weight: 500;
      transition: background .2s, color .2s;
    }

    .nav-link:hover {
      color: #FFFFFF;
      background: rgba(34, 217, 208, 0.08);
    }

    .nav-link.is-active {
      color: #FFFFFF;
      background: rgba(34, 217, 208, 0.1);
      font-weight: 600;
    }

    .nav-link.is-active::after {
      content: "";
      position: absolute;
      left: 18px;
      right: 18px;
      bottom: 4px;
      height: 2px;
      border-radius: 999px;
      background: var(--cyan);
      box-shadow: 0 0 10px rgba(34, 217, 208, 0.7);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
      margin-left: auto;
    }

    .header-actions .btn {
      min-height: 42px;
      padding: 9px 18px;
      font-size: 14px;
    }

    .nav-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border-radius: 10px;
      border: 1px solid rgba(130, 165, 220, 0.18);
      background: rgba(16, 26, 52, 0.5);
      color: #FFFFFF;
      align-items: center;
      justify-content: center;
      transition: border-color .2s, background .2s, transform .2s;
    }

    .nav-toggle:hover {
      border-color: rgba(34, 217, 208, 0.5);
      background: rgba(34, 217, 208, 0.1);
    }

    .nav-toggle:active {
      transform: scale(0.96);
    }

    .content-hero {
      position: relative;
      padding: 176px 0 78px;
      background:
        radial-gradient(circle at 18% 20%, rgba(34, 217, 208, 0.09), transparent 260px),
        radial-gradient(circle at 84% 10%, rgba(47, 107, 255, 0.2), transparent 420px),
        linear-gradient(180deg, rgba(5, 7, 15, 0.86), rgba(10, 17, 32, 0.92)),
        url('/assets/images/backpic/back-3.png') center / cover no-repeat;
    }

    .content-hero::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: -1px;
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(34, 217, 208, 0.45), rgba(47, 107, 255, 0.4), transparent);
      pointer-events: none;
    }

    .hero-column {
      position: relative;
      z-index: 1;
      max-width: 980px;
      margin-left: 0;
    }

    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 26px;
      color: var(--text-weak);
      font-size: 14px;
    }

    .breadcrumb a {
      color: var(--text-sub);
      transition: color .2s;
    }

    .breadcrumb a:hover {
      color: var(--cyan);
    }

    .breadcrumb .divider {
      color: rgba(178, 194, 224, 0.44);
    }

    .hero-kicker {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 18px;
      padding: 7px 14px;
      border: 1px solid rgba(34, 217, 208, 0.3);
      border-radius: 999px;
      background: rgba(34, 217, 208, 0.08);
      color: #C9F6F2;
      font-size: 13.5px;
      font-weight: 500;
      letter-spacing: .3px;
    }

    .hero-kicker::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 10px rgba(34, 217, 208, 0.85);
    }

    .hero-column h1 {
      font-size: clamp(42px, 6vw, 66px);
      line-height: 1.08;
      font-weight: 750;
      letter-spacing: 0;
      color: #FFFFFF;
      margin-bottom: 20px;
    }

    .hero-lead {
      max-width: 780px;
      font-size: 18px;
      line-height: 1.9;
      color: var(--text-sub);
    }

    .hero-tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 32px;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 15px;
      border-radius: 999px;
      background: rgba(13, 21, 40, 0.7);
      border: 1px solid rgba(130, 165, 220, 0.16);
      color: var(--text-sub);
      font-size: 13px;
    }

    .hero-tag i {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 8px rgba(34, 217, 208, 0.6);
    }

    .index-area,
    .operation-area,
    .assist-area,
    .bottom-note-area {
      padding: 96px 0;
    }

    .index-area {
      background: linear-gradient(180deg, rgba(10, 17, 32, 0.2), rgba(5, 7, 15, 0.2));
    }

    .section-head {
      margin-bottom: 44px;
    }

    .section-head.compact {
      max-width: 760px;
    }

    .section-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      color: var(--cyan);
      font-size: 14px;
      font-weight: 600;
      letter-spacing: 1px;
      text-transform: none;
    }

    .section-eyebrow::after {
      content: "";
      width: 36px;
      height: 1px;
      background: linear-gradient(90deg, var(--cyan), transparent);
    }

    .section-head h2 {
      margin-top: 14px;
      font-size: clamp(28px, 4vw, 38px);
      line-height: 1.3;
      color: #FFFFFF;
      font-weight: 700;
    }

    .section-head p {
      margin-top: 14px;
      font-size: 16px;
      color: var(--text-sub);
      line-height: 1.8;
    }

    .chapter-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 18px;
    }

    .chapter-card {
      position: relative;
      display: block;
      min-height: 180px;
      padding: 26px 24px 22px;
      border: 1px solid rgba(130, 165, 220, 0.16);
      border-radius: 18px;
      background: linear-gradient(145deg, rgba(16, 26, 52, 0.6), rgba(11, 18, 36, 0.74));
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: transform .24s, border-color .24s, background .24s, box-shadow .24s;
    }

    .chapter-card::before {
      content: "";
      position: absolute;
      top: -50px;
      right: -50px;
      width: 120px;
      height: 120px;
      border-radius: 50%;
      background: rgba(47, 107, 255, 0.16);
      filter: blur(10px);
      transition: opacity .3s;
      opacity: .6;
    }

    .chapter-card:hover {
      transform: translateY(-4px);
      border-color: rgba(34, 217, 208, 0.3);
      background: linear-gradient(145deg, rgba(20, 32, 64, 0.84), rgba(10, 17, 32, 0.9));
      box-shadow: 0 18px 50px rgba(0, 0, 0, 0.3);
    }

    .chapter-no {
      position: relative;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      height: 30px;
      padding: 0 12px;
      border-radius: 999px;
      background: rgba(34, 217, 208, 0.1);
      border: 1px solid rgba(34, 217, 208, 0.2);
      color: var(--cyan);
      font-size: 12px;
      font-weight: 600;
      letter-spacing: .6px;
    }

    .chapter-card strong {
      position: relative;
      display: block;
      margin-top: 16px;
      font-size: 18px;
      color: #FFFFFF;
      font-weight: 650;
      line-height: 1.4;
    }

    .chapter-card span {
      position: relative;
      display: block;
      margin-top: 10px;
      color: var(--text-sub);
      font-size: 14px;
      line-height: 1.75;
    }

    .chapter-card .chapter-arrow {
      position: relative;
      margin-top: 20px;
      color: var(--cyan);
      font-size: 14px;
      font-weight: 600;
      transition: letter-spacing .2s;
    }

    .chapter-card:hover .chapter-arrow {
      letter-spacing: .5px;
    }

    .operation-area {
      padding-top: 40px;
    }

    .operation-subtitle {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 36px;
      padding: 24px 0;
      border-bottom: 1px solid var(--divider);
    }

    .operation-subtitle h2 {
      font-size: clamp(24px, 3vw, 34px);
      color: #FFFFFF;
    }

    .operation-subtitle p {
      max-width: 620px;
      color: var(--text-sub);
      font-size: 15px;
      line-height: 1.8;
    }

    .operation-card {
      position: relative;
      display: block;
      margin-bottom: 28px;
      padding: 42px;
      border-radius: var(--radius-lg);
      background: linear-gradient(145deg, rgba(15, 25, 52, 0.72), rgba(8, 14, 28, 0.86));
      border: 1px solid rgba(130, 165, 220, 0.15);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .operation-card::before {
      content: "";
      position: absolute;
      top: 0;
      bottom: 0;
      left: 0;
      width: 3px;
      background: linear-gradient(180deg, var(--cyan), rgba(47, 107, 255, 0.18));
      opacity: .6;
    }

    .operation-header {
      display: flex;
      align-items: flex-start;
      gap: 18px;
    }

    .operation-no {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 52px;
      height: 52px;
      border-radius: 16px;
      border: 1px solid rgba(34, 217, 208, 0.32);
      background: rgba(34, 217, 208, 0.08);
      color: var(--cyan);
      font-size: 18px;
      font-weight: 700;
      font-family: "Bahnschrift", "DIN Alternate", "Roboto", sans-serif;
    }

    .operation-title-row {
      flex: 1;
      min-width: 0;
    }

    .operation-title-row h3 {
      font-size: 24px;
      line-height: 1.35;
      color: #FFFFFF;
      font-weight: 700;
    }

    .operation-title-row p {
      margin-top: 8px;
      color: var(--text-sub);
      font-size: 15.5px;
      line-height: 1.85;
    }

    .operation-body {
      margin-top: 28px;
      padding-left: 70px;
    }

    .operation-note {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 14px 18px;
      margin-top: 18px;
      border-radius: 14px;
      background: rgba(47, 107, 255, 0.08);
      border: 1px solid rgba(47, 107, 255, 0.16);
      color: #C7D6FF;
      font-size: 14px;
      line-height: 1.75;
    }

    .operation-note::before {
      content: "提示";
      flex: 0 0 auto;
      margin-top: 2px;
      padding: 1px 9px;
      border-radius: 999px;
      background: rgba(47, 107, 255, 0.18);
      color: #DCE7FF;
      font-size: 12px;
      font-weight: 600;
    }

    .operation-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 22px;
      padding-left: 70px;
    }

    .operation-links .btn {
      min-height: 40px;
      padding: 8px 18px;
      font-size: 14px;
    }

    .text-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--cyan);
      font-size: 15px;
      font-weight: 600;
      transition: gap .2s, color .2s;
    }

    .text-link:hover {
      gap: 12px;
      color: #FFFFFF;
    }

    .text-link .arrow {
      transition: transform .2s;
    }

    .text-link:hover .arrow {
      transform: translateX(3px);
    }

    .operation-duo {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
      gap: 38px;
      align-items: center;
      margin-top: 30px;
      padding-left: 70px;
    }

    .operation-media {
      position: relative;
      border-radius: 16px;
      border: 1px solid rgba(120, 175, 255, 0.14);
      overflow: hidden;
      background: rgba(5, 9, 20, 0.6);
    }

    .operation-media img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .media-caption {
      display: block;
      padding: 11px 14px;
      color: var(--text-weak);
      font-size: 12.5px;
      line-height: 1.6;
      text-align: center;
      border-top: 1px solid rgba(130, 165, 220, 0.12);
    }

    .step-list {
      margin-top: 14px;
      list-style: none;
      counter-reset: stepCounter;
      display: grid;
      gap: 14px;
    }

    .step-list li {
      position: relative;
      counter-increment: stepCounter;
      padding-left: 44px;
      color: #BDCAE4;
      font-size: 15px;
      line-height: 1.8;
    }

    .step-list li::before {
      content: counter(stepCounter);
      position: absolute;
      left: 0;
      top: 1px;
      display: flex;
      justify-content: center;
      align-items: center;
      width: 27px;
      height: 27px;
      border-radius: 50%;
      background: rgba(34, 217, 208, 0.1);
      border: 1px solid rgba(34, 217, 208, 0.22);
      color: var(--cyan);
      font-size: 13px;
      font-weight: 650;
      line-height: 1;
    }

    .assist-area {
      padding-top: 28px;
      padding-bottom: 58px;
    }

    .assist-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 20px;
    }

    .assist-card {
      padding: 34px 36px;
      border-radius: 18px;
      background: rgba(13, 21, 40, 0.72);
      border: 1px solid rgba(130, 165, 220, 0.14);
      transition: border-color .22s, background .22s, transform .22s;
    }

    .assist-card:hover {
      border-color: rgba(34, 217, 208, 0.3);
      background: rgba(15, 25, 52, 0.82);
      transform: translateY(-2px);
    }

    .assist-card h3 {
      font-size: 20px;
      color: #FFFFFF;
      line-height: 1.5;
    }

    .assist-card p {
      margin-top: 12px;
      color: var(--text-sub);
      font-size: 15px;
      line-height: 1.85;
    }

    .assist-card .btn {
      margin-top: 20px;
      min-height: 40px;
      padding: 9px 20px;
      font-size: 14px;
    }

    .bottom-note-area {
      padding: 64px 0 96px;
      background: transparent;
    }

    .bottom-note {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 38px;
      flex-wrap: wrap;
      padding: 44px 50px;
      border-radius: 24px;
      background:
        radial-gradient(circle at 8% 10%, rgba(34, 217, 208, 0.12), transparent 280px),
        linear-gradient(140deg, rgba(16, 26, 52, 0.68), rgba(9, 16, 33, 0.95));
      border: 1px solid rgba(120, 175, 255, 0.18);
      overflow: hidden;
    }

    .bottom-note h2 {
      font-size: clamp(22px, 3vw, 30px);
      color: #FFFFFF;
      line-height: 1.35;
    }

    .bottom-note p {
      max-width: 640px;
      margin-top: 12px;
      color: var(--text-sub);
      font-size: 15.5px;
      line-height: 1.8;
    }

    .bottom-note .btn {
      min-height: 48px;
    }

    .site-footer {
      background: #04060D;
      border-top: 1px solid rgba(120, 175, 255, 0.08);
    }

    .footer-top {
      padding: 72px 0 40px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.7fr 1fr 1fr 1.2fr;
      gap: 48px;
    }

    .footer-brand p {
      max-width: 330px;
      margin-top: 14px;
      color: var(--text-weak);
      font-size: 14px;
      line-height: 1.9;
    }

    .footer-brand .brand-text small {
      color: var(--text-weak);
    }

    .footer-title {
      margin-bottom: 18px;
      font-size: 15px;
      color: #FFFFFF;
      font-weight: 650;
    }

    .footer-grid ul {
      list-style: none;
      display: grid;
      gap: 12px;
    }

    .footer-grid ul a {
      color: var(--text-sub);
      font-size: 14px;
      transition: color .2s, padding-left .2s;
    }

    .footer-grid ul a:hover {
      color: var(--cyan);
      padding-left: 4px;
    }

    .footer-contact {
      color: var(--text-sub);
      font-size: 14px;
      line-height: 2;
    }

    .footer-contact p {
      margin-bottom: 8px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(130, 165, 220, 0.12);
      padding: 20px 0 24px;
      color: var(--text-weak);
      font-size: 13px;
      line-height: 1.8;
    }

    .footer-bottom span {
      font-size: 13px;
    }

    @media (max-width: 1140px) {
      .nav-menu-wrap {
        position: fixed;
        top: 76px;
        left: 0;
        width: 100%;
        display: none;
        margin: 0;
        padding: 20px 28px 30px;
        background: rgba(6, 10, 20, 0.96);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
        border-bottom: 1px solid rgba(120, 175, 255, 0.12);
        max-height: calc(100vh - 76px);
        overflow-y: auto;
      }

      .nav-menu-wrap.is-open {
        display: block;
      }

      .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
      }

      .nav-link {
        justify-content: flex-start;
        height: auto;
        min-height: 46px;
        padding: 12px 16px;
        font-size: 16px;
      }

      .nav-link.is-active::after {
        left: auto;
        right: auto;
        bottom: auto;
        top: 50%;
        transform: translateY(-50%);
        width: 3px;
        height: 20px;
        left: 6px;
      }

      .nav-toggle {
        display: inline-flex;
      }

      .header-actions {
        margin-left: 0;
      }

      .operation-duo {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 960px) {
      .chapter-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .operation-body {
        padding-left: 0;
      }

      .operation-duo {
        padding-left: 0;
      }

      .operation-links {
        padding-left: 0;
      }

      .assist-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
      }
    }

    @media (max-width: 760px) {
      .container {
        width: min(100% - 40px, 1240px);
      }

      .content-hero {
        padding: 128px 0 56px;
      }

      .hero-column h1 {
        font-size: 38px;
      }

      .hero-lead {
        font-size: 16px;
      }

      .hero-tag-row {
        gap: 9px;
      }

      .index-area,
      .operation-area,
      .assist-area,
      .bottom-note-area {
        padding: 68px 0 48px;
      }

      .operation-card {
        padding: 30px 22px 26px;
      }

      .operation-header {
        flex-direction: row;
        gap: 14px;
      }

      .operation-no {
        flex-basis: 46px;
        height: 46px;
        border-radius: 13px;
      }

      .operation-title-row h3 {
        font-size: 21px;
      }

      .operation-title-row p {
        font-size: 14.5px;
      }

      .operation-medial .operation-duo {
        gap: 20px;
      }

      .bottom-note {
        padding: 32px 22px;
      }

      .bottom-note .btn {
        width: 100%;
      }
    }

    @media (max-width: 600px) {
      .brand-text small {
        display: none;
      }

      .brand-text strong {
        font-size: 16px;
      }

      .header-actions .btn-outline {
        display: none;
      }

      .header-actions .btn {
        padding: 8px 13px;
        font-size: 13.5px;
      }

      .header-actions {
        gap: 8px;
      }

      .chapter-grid {
        grid-template-columns: 1fr;
      }

      .operation-links {
        flex-direction: column;
      }

      .operation-links .btn {
        width: 100%;
      }

      .assist-card {
        padding: 26px 22px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }

      .footer-bottom {
        padding-bottom: 20px;
      }

      .nav-menu-wrap {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        scroll-behavior: auto !important;
        transition: none !important;
        animation: none !important;
      }
    }

/* roulang page: category4 */
:root {
      --bg: #05070F;
      --bg2: #0A1120;
      --bg3: #0D1528;
      --bg-deep: #04060D;
      --card: rgba(17, 27, 54, 0.55);
      --card-border: rgba(120, 175, 255, 0.22);
      --line: rgba(130, 165, 220, 0.16);
      --text: #EEF4FF;
      --text2: #B2C2E0;
      --text3: #7B8EB3;
      --blue: #2F6BFF;
      --blue-hover: #4A85FF;
      --cyan: #22D9D0;
      --orange: #FFAA5C;
      --radius-xl: 18px;
      --radius-md: 12px;
      --radius-sm: 10px;
      --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.18);
      --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.30);
      --shadow-btn: 0 8px 30px rgba(35, 80, 255, 0.35);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      background: var(--bg);
      color: var(--text);
      font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      font-size: 16px;
      line-height: 1.8;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    button {
      font-family: inherit;
      border: none;
      background: none;
      cursor: pointer;
    }

    ul {
      list-style: none;
    }

    ::selection {
      background: rgba(34, 217, 208, 0.22);
      color: #fff;
    }

    :focus-visible {
      outline: 2px solid var(--cyan);
      outline-offset: 3px;
      border-radius: 4px;
    }

    .container {
      max-width: 1240px;
      width: 100%;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 48px;
      padding: 0 24px;
      border-radius: var(--radius-md);
      font-size: 15px;
      font-weight: 600;
      line-height: 1.2;
      letter-spacing: 0.2px;
      transition: color .24s ease, background .24s ease, border-color .24s ease, box-shadow .24s ease, transform .24s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(180deg, #2F6BFF, #2255E0);
      color: #fff;
      box-shadow: 0 8px 30px rgba(35, 80, 255, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(180deg, #4A85FF, #2F6BFF);
      transform: translateY(-2px);
      box-shadow: 0 12px 38px rgba(35, 80, 255, 0.44);
    }

    .btn-primary:active {
      transform: translateY(1px);
      box-shadow: 0 4px 16px rgba(35, 80, 255, 0.32);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(160, 190, 240, 0.28);
      color: rgba(255, 255, 255, 0.86);
    }

    .btn-outline:hover {
      border-color: var(--cyan);
      color: var(--cyan);
      background: rgba(34, 217, 208, 0.06);
    }

    .btn-cyan {
      background: linear-gradient(135deg, #18D6CF, #10A8B8);
      color: #041014;
      box-shadow: 0 0 26px rgba(34, 217, 208, 0.35);
    }

    .btn-cyan:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 34px rgba(34, 217, 208, 0.5);
      color: #041014;
    }

    .btn-cyan:active {
      transform: translateY(1px);
    }

    .btn-lg {
      min-height: 56px;
      padding: 0 32px;
      font-size: 16px;
    }

    .chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 32px;
      padding: 0 14px;
      border-radius: 999px;
      border: 1px solid rgba(34, 217, 208, 0.24);
      background: rgba(34, 217, 208, 0.08);
      color: var(--cyan);
      font-size: 13px;
      line-height: 1;
      white-space: nowrap;
    }

    .section {
      padding: 100px 0;
    }

    .section-head {
      max-width: 860px;
      margin-bottom: 44px;
    }

    .section-head.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .section-kicker {
      display: inline-block;
      margin-bottom: 12px;
      color: var(--cyan);
      font-size: 14px;
      letter-spacing: 0.8px;
      font-weight: 600;
    }

    .section-title {
      font-size: clamp(30px, 4vw, 40px);
      line-height: 1.3;
      font-weight: 700;
      color: var(--text);
      letter-spacing: 0.2px;
    }

    .section-lead {
      margin-top: 14px;
      font-size: 16px;
      color: var(--text2);
      max-width: 720px;
    }

    .section-head.center .section-lead {
      margin-left: auto;
      margin-right: auto;
    }

    /* ========== Header ========== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(6, 10, 20, 0.76);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(130, 165, 220, 0.12);
      transition: background .3s ease, border-color .3s ease, box-shadow .3s ease;
    }

    .site-header.scrolled {
      background: rgba(5, 8, 16, 0.88);
      border-bottom-color: rgba(130, 165, 220, 0.2);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.24);
    }

    .header-inner {
      height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .brand-mark {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      flex-shrink: 0;
    }

    .brand-mark svg {
      width: 34px;
      height: 34px;
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .brand-text strong {
      color: var(--text);
      font-size: 18px;
      font-weight: 700;
      letter-spacing: 0.3px;
      white-space: nowrap;
    }

    .brand-text small {
      color: var(--text3);
      font-size: 11px;
      letter-spacing: 0.6px;
      margin-top: 3px;
    }

    .nav-menu-wrap {
      flex: 1;
      display: flex;
      justify-content: center;
      padding: 0 16px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-link {
      position: relative;
      display: inline-flex;
      min-height: 40px;
      align-items: center;
      padding: 0 6px;
      color: var(--text2);
      font-size: 15px;
      font-weight: 500;
      transition: color .2s ease, background .2s ease, border-color .2s ease;
      border-radius: var(--radius-sm);
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 10px;
      right: 10px;
      bottom: 4px;
      height: 2px;
      border-radius: 999px;
      background: transparent;
      transition: background .2s ease;
    }

    .nav-link:hover {
      color: #fff;
      background: rgba(34, 217, 208, 0.08);
    }

    .nav-link.is-active {
      color: #fff;
    }

    .nav-link.is-active::after {
      background: var(--cyan);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .header-actions .btn {
      min-height: 42px;
      padding: 0 18px;
      font-size: 14px;
    }

    .header-actions .btn-primary {
      box-shadow: 0 6px 22px rgba(35, 80, 255, 0.34);
    }

    .nav-toggle {
      display: none;
      width: 42px;
      height: 42px;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(130, 165, 220, 0.18);
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.04);
      color: var(--text);
      transition: border-color .2s ease, background .2s ease;
    }

    .nav-toggle:hover {
      border-color: rgba(34, 217, 208, 0.5);
      background: rgba(34, 217, 208, 0.08);
    }

    /* ========== Page Hero ========== */
    .page-hero {
      position: relative;
      display: flex;
      align-items: center;
      min-height: 560px;
      padding: 170px 0 80px;
      overflow: hidden;
      background: linear-gradient(180deg, #05070F 0%, #091224 100%);
    }

    .page-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: linear-gradient(90deg, rgba(5, 7, 15, 0.92) 0%, rgba(5, 7, 15, 0.68) 55%, rgba(5, 7, 15, 0.42) 100%), url("/assets/images/backpic/back-2.png");
      background-size: cover;
      background-position: center 26%;
      opacity: 0.9;
      z-index: 0;
    }

    .page-hero::after {
      content: "";
      position: absolute;
      width: 460px;
      height: 460px;
      right: 4%;
      top: 22%;
      background: radial-gradient(circle, rgba(47, 107, 255, 0.34) 0%, rgba(47, 107, 255, 0) 70%);
      z-index: 0;
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 970px;
    }

    .hero-crumb {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      color: var(--text3);
      font-size: 13px;
      margin-bottom: 24px;
    }

    .hero-crumb a {
      color: var(--text2);
      transition: color .2s ease;
    }

    .hero-crumb a:hover {
      color: var(--cyan);
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 14px;
      border-radius: 999px;
      border: 1px solid rgba(34, 217, 208, 0.3);
      background: rgba(34, 217, 208, 0.1);
      color: var(--cyan);
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 24px;
    }

    .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 0 0 rgba(34, 217, 208, 0.5);
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(34, 217, 208, 0.5);
      }
      70% {
        box-shadow: 0 0 0 8px rgba(34, 217, 208, 0);
      }
      100% {
        box-shadow: 0 0 0 0 rgba(34, 217, 208, 0);
      }
    }

    .page-hero h1 {
      color: var(--text);
      font-size: clamp(36px, 5vw, 62px);
      line-height: 1.14;
      letter-spacing: 0.4px;
      font-weight: 800;
    }

    .hero-lead {
      margin-top: 20px;
      font-size: 18px;
      line-height: 1.85;
      color: var(--text2);
      max-width: 760px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 34px;
    }

    .hero-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 28px;
    }

    .hero-chips .chip {
      border-color: rgba(160, 190, 240, 0.18);
      background: rgba(255, 255, 255, 0.05);
      color: var(--text2);
      padding: 0 15px;
      min-height: 36px;
      font-size: 14px;
      transition: color .2s ease, border-color .2s ease, background .2s ease;
    }

    .hero-chips .chip:hover {
      color: var(--cyan);
      border-color: rgba(34, 217, 208, 0.45);
      background: rgba(34, 217, 208, 0.08);
    }

    /* ========== Status bar ========== */
    .status-bar {
      border-bottom: 1px solid var(--line);
      background: #070D19;
      padding: 15px 0;
    }

    .status-row {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px 30px;
      color: var(--text2);
      font-size: 14px;
    }

    .status-item {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .status-item .pulse-dot {
      width: 7px;
      height: 7px;
    }

    .status-item.highlight {
      color: var(--cyan);
    }

    /* ========== Guide modules ========== */
    .guide-section {
      background: var(--bg);
      padding: 100px 0;
    }

    .guide-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    .guide-card {
      background: var(--card);
      border: 1px solid var(--card-border);
      border-radius: 20px;
      padding: 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      position: relative;
      overflow: hidden;
      transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
    }

    .guide-card::before {
      content: "";
      position: absolute;
      right: -80px;
      top: -80px;
      width: 180px;
      height: 180px;
      background: radial-gradient(circle, rgba(47, 107, 255, 0.2), rgba(47, 107, 255, 0));
      pointer-events: none;
    }

    .guide-card:hover {
      transform: translateY(-4px);
      border-color: rgba(34, 217, 208, 0.36);
      box-shadow: var(--shadow-lg);
    }

    .guide-card-media {
      border-radius: 16px;
      border: 1px solid rgba(255, 255, 255, 0.08);
      overflow: hidden;
      margin-bottom: 24px;
      max-height: 190px;
    }

    .guide-card-media img {
      width: 100%;
      height: 190px;
      object-fit: cover;
    }

    .guide-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 18px;
    }

    .guide-num {
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 1px;
      color: var(--cyan);
    }

    .guide-card h2 {
      font-size: 22px;
      line-height: 1.45;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 14px;
    }

    .guide-card > p {
      color: var(--text2);
      font-size: 15px;
      line-height: 1.85;
      margin-bottom: 20px;
    }

    .guide-list {
      margin-top: auto;
      padding: 20px 0 22px;
      border-top: 1px solid var(--line);
    }

    .guide-list li {
      position: relative;
      padding: 9px 0 9px 28px;
      color: var(--text2);
      font-size: 15px;
      line-height: 1.7;
    }

    .guide-list li::before {
      content: "";
      position: absolute;
      left: 2px;
      top: 19px;
      width: 9px;
      height: 9px;
      border-radius: 2px;
      background: linear-gradient(135deg, var(--cyan), #10A8B8);
    }

    .text-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 40px;
      color: var(--cyan);
      font-size: 15px;
      font-weight: 600;
      transition: color .2s ease, gap .2s ease;
    }

    .text-link::after {
      content: "→";
      font-size: 17px;
      transition: transform .2s ease;
    }

    .text-link:hover {
      color: #fff;
      gap: 10px;
    }

    /* ========== FAQ ========== */
    .faq-section {
      background: linear-gradient(180deg, var(--bg2) 0%, #0B1426 100%);
      padding: 100px 0;
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }

    .faq-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-bottom: 44px;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px 20px;
      align-items: start;
    }

    .faq-col {
      display: grid;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg3);
      border: 1px solid var(--line);
      border-radius: 18px;
      overflow: hidden;
      transition: border-color .25s ease, background .25s ease;
    }

    .faq-item:hover {
      border-color: rgba(130, 165, 220, 0.3);
    }

    .faq-item.is-open {
      border-color: rgba(34, 217, 208, 0.3);
    }

    .faq-q {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 20px 22px;
      color: var(--text);
      font-size: 16px;
      font-weight: 600;
      text-align: left;
      line-height: 1.6;
      transition: background .2s ease, color .2s ease;
      min-height: 56px;
    }

    .faq-q:hover {
      background: rgba(34, 217, 208, 0.06);
      color: var(--cyan);
    }

    .faq-icon {
      position: relative;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 26px;
      height: 26px;
      border-radius: 50%;
      border: 1px solid rgba(160, 190, 240, 0.3);
      color: var(--text2);
      flex-shrink: 0;
      transition: transform .25s ease, background .25s ease, border-color .25s ease, color .25s ease;
    }

    .faq-icon::after {
      content: "+";
      font-size: 19px;
      line-height: 1;
      font-weight: 400;
    }

    .faq-item.is-open .faq-icon {
      transform: rotate(45deg);
      background: var(--cyan);
      border-color: var(--cyan);
      color: #041014;
    }

    .faq-a {
      display: none;
      padding: 0 22px 22px;
      color: var(--text2);
      font-size: 15px;
      line-height: 1.85;
    }

    .faq-item.is-open .faq-a {
      display: block;
    }

    .faq-a p {
      padding-top: 4px;
    }

    .faq-more-note {
      margin-top: 40px;
      text-align: center;
      color: var(--text3);
      font-size: 14px;
    }

    /* ========== Contact CTA ========== */
    .contact-cta {
      position: relative;
      padding: 100px 0;
      background: linear-gradient(180deg, #060A14 0%, #0A1224 100%);
      overflow: hidden;
    }

    .contact-cta::before {
      content: "";
      position: absolute;
      left: 50%;
      top: 50%;
      width: 620px;
      height: 620px;
      transform: translate(-50%, -50%);
      background: radial-gradient(circle, rgba(47, 107, 255, 0.18) 0%, rgba(47, 107, 255, 0) 70%);
      pointer-events: none;
    }

    .contact-cta-inner {
      position: relative;
      z-index: 2;
      max-width: 860px;
      margin: 0 auto;
      text-align: center;
    }

    .contact-cta h2 {
      font-size: clamp(28px, 4vw, 40px);
      font-weight: 700;
      line-height: 1.3;
      color: var(--text);
    }

    .contact-cta p {
      margin: 18px auto 0;
      max-width: 720px;
      color: var(--text2);
      font-size: 16px;
      line-height: 1.85;
    }

    .cta-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-top: 34px;
    }

    .contact-points {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 26px;
    }

    /* ========== Footer ========== */
    .site-footer {
      background: #04060D;
      border-top: 1px solid rgba(130, 165, 220, 0.14);
    }

    .footer-top {
      padding: 68px 0 36px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
      gap: 40px;
    }

    .footer-brand .brand {
      margin-bottom: 16px;
    }

    .footer-brand p {
      margin-top: 18px;
      color: var(--text3);
      font-size: 14px;
      max-width: 340px;
      line-height: 1.8;
    }

    .footer-title {
      color: var(--text);
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: 0.4px;
    }

    .footer-column ul li,
    .footer-column ul li a {
      color: var(--text3);
      font-size: 14px;
      line-height: 1.7;
      transition: color .2s ease, padding-left .2s ease;
    }

    .footer-column ul li + li {
      margin-top: 10px;
    }

    .footer-column ul li a:hover {
      color: var(--cyan);
    }

    .footer-contact p {
      color: var(--text3);
      font-size: 14px;
      line-height: 1.8;
    }

    .footer-contact p + p {
      margin-top: 10px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(130, 165, 220, 0.12);
      padding: 20px 0;
      font-size: 13px;
      color: var(--text3);
      line-height: 1.8;
    }

    /* ========== Responsive ========== */
    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.001s !important;
        transition-duration: 0.001s !important;
      }
      html {
        scroll-behavior: auto;
      }
    }

    @media (max-width: 1199px) {
      .nav-menu {
        gap: 18px;
      }
      .brand-text strong {
        font-size: 16px;
      }
      .brand-text small {
        font-size: 10px;
      }
      .page-hero {
        padding: 150px 0 64px;
      }
      .page-hero h1 {
        font-size: clamp(34px, 5vw, 52px);
      }
      .guide-card {
        padding: 24px;
      }
    }

    @media (max-width: 991px) {
      .nav-toggle {
        display: inline-flex;
      }

      .nav-menu-wrap {
        position: fixed;
        top: 76px;
        left: 16px;
        right: 16px;
        z-index: 1200;
        display: none;
        padding: 16px;
        background: rgba(5, 8, 17, 0.98);
        border: 1px solid rgba(130, 165, 220, 0.2);
        border-radius: 18px;
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.44);
        backdrop-filter: blur(20px);
      }

      .nav-menu-wrap.open {
        display: block;
      }

      .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
      }

      .nav-link {
        width: 100%;
        min-height: 48px;
        padding: 0 14px;
        border-radius: 12px;
      }

      .nav-link::after {
        display: none;
      }

      .nav-link.is-active,
      .nav-link:hover {
        background: rgba(34, 217, 208, 0.1);
      }

      .status-row {
        gap: 10px 20px;
      }

      .guide-grid {
        grid-template-columns: 1fr 1fr;
      }

      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 767px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }

      .header-inner {
        height: 62px;
      }

      .nav-menu-wrap {
        top: 62px;
      }

      .header-actions .btn {
        min-height: 38px;
        padding: 0 14px;
        font-size: 13px;
      }

      .header-actions .btn-outline {
        display: none;
      }

      .brand-text strong {
        font-size: 16px;
      }

      .brand-text small {
        display: none;
      }

      .page-hero {
        min-height: 0;
        padding: 120px 0 56px;
      }

      .hero-lead {
        font-size: 16px;
      }

      .hero-actions {
        gap: 12px;
      }

      .hero-actions .btn {
        width: 100%;
      }

      .guide-section,
      .faq-section,
      .contact-cta {
        padding: 72px 0;
      }

      .guide-grid {
        grid-template-columns: 1fr;
      }

      .section {
        padding: 72px 0;
      }

      .section-title {
        font-size: 28px;
      }

      .guide-card h2 {
        font-size: 20px;
      }

      .footer-top {
        padding: 52px 0 24px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }

      .footer-bottom {
        padding: 18px 0;
      }

      .cta-actions {
        flex-direction: column;
      }

      .cta-actions .btn {
        width: 100%;
      }

      .contact-cta p {
        font-size: 15px;
      }
    }

    @media (max-width: 520px) {
      .header-actions .btn-primary {
        padding: 0 13px;
        font-size: 13px;
      }

      .brand-text strong {
        font-size: 15px;
      }

      .brand-mark {
        width: 32px;
        height: 32px;
      }

      .brand-mark svg {
        width: 30px;
        height: 30px;
      }

      .footer-bottom {
        text-align: center;
      }

      .footer-bottom .container {
        flex-direction: column;
        align-items: center;
        text-align: center;
      }
    }