/* roulang page: index */
:root {
  --primary: #00E5FF;
  --secondary: #FF2D95;
  --accent: #7B61FF;
  --bg: #0B0F1A;
  --card: #131A2A;
  --panel: #0E1322;
  --text: #E8F0F8;
  --text-dim: #8892A6;
  --border: rgba(0, 229, 255, 0.12);
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-neon: 0 8px 30px rgba(0, 229, 255, 0.15);
  --font: system-ui, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --nav-h: 72px;
  --container: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 15px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

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

ul, ol {
  list-style: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding: 88px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--primary);
  text-transform: uppercase;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.section-sub {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.7;
}

.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
  }
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 28px;
  border-radius: 8px;
  transition: box-shadow 0.3s ease, transform 0.3s ease, background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  line-height: 1.4;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #06121A;
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 0 32px rgba(0, 229, 255, 0.5), 0 0 60px rgba(0, 229, 255, 0.2);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 229, 255, 0.35);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
  transform: translateY(-2px);
}

.btn-download {
  background: linear-gradient(135deg, var(--primary), var(--accent), var(--secondary));
  color: #06121A;
  font-size: 18px;
  font-weight: 700;
  padding: 20px 52px;
  border-radius: 12px;
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.3), 0 0 60px rgba(123, 97, 255, 0.15);
  transition: all 0.35s ease;
}

.btn-download:hover {
  box-shadow: 0 0 48px rgba(0, 229, 255, 0.5), 0 0 80px rgba(123, 97, 255, 0.25);
  transform: translateY(-3px) scale(1.02);
}

.btn-ghost-light {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #fff;
  padding: 14px 26px;
  border-radius: 10px;
  font-weight: 600;
}

.btn-ghost-light:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.4);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(11, 15, 26, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 50%, var(--secondary) 100%);
  opacity: 0.7;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 20px;
}

.logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.45);
  line-height: 1.3;
  white-space: nowrap;
}

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

.nav-link {
  font-size: 15px;
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  position: relative;
  transition: color 0.25s ease, background 0.25s ease, text-shadow 0.25s ease;
}

.nav-link:hover {
  color: var(--primary);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.35);
  background: rgba(0, 229, 255, 0.06);
}

.nav-link.active {
  color: var(--primary);
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
}

.nav-btn {
  font-size: 14px;
  font-weight: 600;
  color: #06121A;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  padding: 9px 20px;
  border-radius: 8px;
  margin-left: 10px;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  box-shadow: 0 0 14px rgba(0, 229, 255, 0.2);
  white-space: nowrap;
}

.nav-btn:hover {
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.45);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 6px;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--primary);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--primary);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-image: linear-gradient(135deg, rgba(11, 15, 26, 0.85) 0%, rgba(11, 15, 26, 0.7) 50%, rgba(11, 15, 26, 0.85) 100%), url('/assets/images/backpic/back-1.webp');
  background-size: cover;
  background-position: center;
  padding-top: var(--nav-h);
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background:
    radial-gradient(600px 400px at 15% 25%, rgba(0, 229, 255, 0.16), transparent 70%),
    radial-gradient(700px 450px at 85% 75%, rgba(123, 97, 255, 0.18), transparent 70%),
    radial-gradient(400px 300px at 70% 20%, rgba(255, 45, 149, 0.10), transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 0 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.22);
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 28px;
  backdrop-filter: blur(6px);
}

.hero-badge i {
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--primary);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: 50px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.5), 0 0 60px rgba(0, 229, 255, 0.15);
}

.hero-title .gradient-text {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 auto 36px;
  line-height: 1.7;
  letter-spacing: 0.01em;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-note {
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.02em;
  margin-top: 14px;
}

.scroll-indicator {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  width: 30px;
  height: 48px;
  border: 1px solid rgba(0, 229, 255, 0.4);
  border-radius: 100px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.scroll-indicator::before {
  content: "";
  width: 4px;
  height: 10px;
  background: var(--primary);
  border-radius: 4px;
  box-shadow: 0 0 8px var(--primary);
  animation: scroll-dot 1.8s ease-in-out infinite;
}

@keyframes scroll-dot {
  0% { transform: translateY(0); opacity: 1; }
  60% { transform: translateY(16px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px 24px;
  text-align: center;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-neon);
  border-color: rgba(0, 229, 255, 0.25);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(123, 97, 255, 0.15));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  border: 1px solid rgba(0, 229, 255, 0.18);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.1);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* Carousel */
.carousel-section {
  background: linear-gradient(180deg, transparent, rgba(11, 15, 26, 0.6), transparent);
}

.carousel-wrap {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
}

.carousel-viewport {
  overflow: hidden;
  border-radius: 16px;
  padding: 10px 0;
}

.carousel-track {
  display: flex;
  gap: 24px;
  transition: transform 0.4s ease;
}

.carousel-slide {
  flex: 0 0 100%;
  min-width: 100%;
  padding: 0 2px;
}

.carousel-slide img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid rgba(0, 229, 255, 0.25);
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.12), 0 12px 40px rgba(0, 0, 0, 0.4);
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(19, 26, 42, 0.9);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--primary);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  z-index: 3;
  backdrop-filter: blur(6px);
}

.carousel-btn:hover {
  background: rgba(19, 26, 42, 1);
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

.carousel-btn.prev {
  left: -22px;
}

.carousel-btn.next {
  right: -22px;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
}

.carousel-dot.active {
  width: 24px;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
}

/* System Requirements */
.sys-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.sys-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.sys-panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}

.sys-panel-head .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.sys-panel-head .dot:nth-child(1) { background: #FF5F57; }
.sys-panel-head .dot:nth-child(2) { background: #FEBC2E; }
.sys-panel-head .dot:nth-child(3) { background: #28C840; }

.sys-panel-head .sys-title {
  margin-left: auto;
  font-size: 14px;
  color: var(--text-dim);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.sys-panel-body {
  padding: 24px 24px 30px;
}

.sys-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 13px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-variant-numeric: tabular-nums;
}

.sys-row:last-child {
  border-bottom: none;
}

.sys-label {
  color: var(--text-dim);
  font-size: 14px;
}

.sys-value {
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.sys-value::before {
  content: "› ";
  color: var(--primary);
  font-weight: 700;
}

.version-bar {
  margin-top: 20px;
  padding: 16px 24px;
  background: linear-gradient(90deg, rgba(0, 229, 255, 0.08), rgba(123, 97, 255, 0.08));
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 14px;
}

.version-bar .ver-label {
  color: var(--text);
  font-weight: 600;
}

.version-bar .ver-code {
  color: var(--primary);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

/* Reviews */
.reviews-wall {
  columns: 3;
  column-gap: 24px;
}

.review-card {
  break-inside: avoid;
  margin-bottom: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-neon);
  border-color: rgba(0, 229, 255, 0.25);
}

.review-user {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(123, 97, 255, 0.2));
  border: 2px solid rgba(0, 229, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  color: var(--primary);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.1);
}

.review-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.review-stars {
  color: #FFB800;
  font-size: 15px;
  letter-spacing: 2px;
  margin-top: 2px;
}

.review-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* Download */
.download-panel {
  background: linear-gradient(135deg, rgba(19, 26, 42, 0.9), rgba(14, 19, 34, 0.95));
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: 20px;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.4), 0 0 80px rgba(0, 229, 255, 0.05);
  text-align: center;
  padding: 64px 48px;
  position: relative;
  overflow: hidden;
}

.download-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(500px 200px at 20% 0%, rgba(0, 229, 255, 0.1), transparent 70%),
    radial-gradient(500px 200px at 80% 100%, rgba(123, 97, 255, 0.1), transparent 70%);
  pointer-events: none;
}

.download-panel > * {
  position: relative;
  z-index: 1;
}

.download-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 10px;
}

.download-sub {
  font-size: 15px;
  color: var(--text-dim);
  margin-bottom: 36px;
}

.download-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.download-actions .btn {
  min-width: 180px;
}

.download-meta {
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  font-variant-numeric: tabular-nums;
}

.download-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.download-meta i {
  color: var(--primary);
  font-style: normal;
}

/* News */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.news-item {
  display: flex;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.news-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-neon);
  border-color: rgba(0, 229, 255, 0.22);
}

.news-thumb {
  width: 280px;
  min-height: 150px;
  flex-shrink: 0;
  overflow: hidden;
}

.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.news-item:hover .news-thumb img {
  transform: scale(1.05);
}

.news-content {
  padding: 22px 26px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  flex: 1;
}

.news-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.03em;
}

.news-content h3 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
}

.news-content h3 a {
  color: var(--text);
  transition: color 0.25s ease;
}

.news-content h3 a:hover {
  color: var(--primary);
}

.news-content p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 4px;
}

.news-meta .date {
  font-variant-numeric: tabular-nums;
}

.empty-tip {
  background: var(--card);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  color: var(--text-dim);
  font-size: 15px;
}

/* CTA Band */
.cta-band {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.12), rgba(123, 97, 255, 0.12), rgba(255, 45, 149, 0.10));
  border-top: 1px solid rgba(0, 229, 255, 0.15);
  border-bottom: 1px solid rgba(0, 229, 255, 0.15);
  text-align: center;
  padding: 72px 24px;
}

.cta-band h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-band p {
  font-size: 16px;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 28px;
}

.cta-band .btn-download {
  font-size: 16px;
  padding: 18px 46px;
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
}

.faq-item:first-child {
  border-top: 1px solid rgba(0, 229, 255, 0.08);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 12px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: color 0.25s ease, border-color 0.25s ease;
  border-left: 2px solid transparent;
  position: relative;
}

.faq-question:hover {
  color: var(--primary);
}

.faq-item.active .faq-question {
  color: var(--primary);
  border-left-color: var(--primary);
}

.faq-question .faq-arrow {
  font-size: 20px;
  color: var(--text-dim);
  transition: transform 0.3s ease, color 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-arrow {
  transform: rotate(45deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer-inner {
  padding: 0 14px 24px;
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.8;
}

/* Footer */
.site-footer {
  background: #070A12;
  border-top: 1px solid rgba(0, 229, 255, 0.12);
  padding: 64px 0 28px;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
  opacity: 0.5;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  font-size: 20px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.7;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: var(--text-dim);
  transition: color 0.25s ease;
}

.footer-col ul li a:hover {
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-dim);
}

.footer-bottom .copyright {
  font-variant-numeric: tabular-nums;
}

/* Back to top */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid rgba(0, 229, 255, 0.25);
  box-shadow: var(--shadow);
  color: var(--primary);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.3s ease, border-color 0.3s ease;
}

.to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  background: var(--primary);
  color: #06121A;
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-title { font-size: 42px; }
  .section { padding: 72px 0; }
  .features-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr; }
  .reviews-wall { columns: 2; }
}

@media (max-width: 991px) {
  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 78%;
    max-width: 340px;
    background: rgba(11, 15, 26, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 4px;
    padding: calc(var(--nav-h) + 24px) 28px 40px;
    transform: translateX(100%);
    transition: transform 0.4s ease;
    z-index: 1000;
    overflow-y: auto;
  }

  .main-nav.open {
    transform: translateX(0);
    box-shadow: -20px 0 60px rgba(0, 0, 0, 0.4);
  }

  .main-nav::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
    opacity: 0.5;
  }

  .nav-link {
    width: 100%;
    font-size: 17px;
    padding: 13px 12px;
    border-radius: 10px;
  }

  .nav-link.active::after {
    left: 12px;
    right: auto;
    width: 34px;
    bottom: auto;
    top: 20%;
    height: 2px;
  }

  .nav-btn {
    margin: 20px 0 0;
    width: 100%;
    justify-content: center;
    padding: 13px;
    font-size: 16px;
  }

  .menu-toggle {
    display: flex;
  }

  .carousel-btn.prev { left: -8px; }
  .carousel-btn.next { right: -8px; }
}

@media (max-width: 768px) {
  .hero-title { font-size: 36px; }
  .hero-sub { font-size: 16px; }
  .section { padding: 56px 0; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .sys-grid { grid-template-columns: 1fr; }
  .download-panel { padding: 48px 24px; }
  .news-item { flex-direction: column; }
  .news-thumb { width: 100%; height: 200px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-band h2 { font-size: 26px; }
}

@media (max-width: 575px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .hero-title { font-size: 32px; }
  .hero-sub { font-size: 15px; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .features-grid { grid-template-columns: 1fr; }
  .reviews-wall { columns: 1; }
  .download-panel { padding: 40px 16px; }
  .download-actions { flex-direction: column; align-items: center; }
  .download-actions .btn { width: 100%; max-width: 340px; }
  .btn-download { width: 100%; max-width: 340px; justify-content: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .version-bar { flex-direction: column; text-align: center; }
  .section-title { font-size: 26px; }
  .download-meta { flex-direction: column; gap: 8px; }
}

/* roulang page: article */
:root {
  --primary: #00E5FF;
  --secondary: #FF2D95;
  --grad-purple: #7B61FF;
  --bg-dark: #0B0F1A;
  --bg-card: #131A2A;
  --bg-deep: #070A12;
  --bg-input: #0E1322;
  --text-main: #E8F0F8;
  --text-sub: #8892A6;
  --border-glow: rgba(0, 229, 255, 0.12);
  --radius-card: 12px;
  --radius-btn: 8px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 30px rgba(0, 229, 255, 0.15);
  --font-stack: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
  --spacer: 80px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background: var(--bg-dark);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style-position: inside;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header & Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  background: rgba(11, 15, 26, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  border-image: linear-gradient(90deg, #00E5FF 0%, #7B61FF 50%, #FF2D95 100%) 1;
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
}

.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  border-radius: var(--radius-btn);
  transition: all 0.25s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, #00E5FF, #7B61FF, #FF2D95);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
}

.nav-link.active::after {
  opacity: 1;
}

.nav-btn {
  display: inline-block;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #00E5FF, #7B61FF);
  border-radius: var(--radius-btn);
  box-shadow: 0 0 16px rgba(0, 229, 255, 0.25);
  transition: all 0.3s ease;
  white-space: nowrap;
}

.nav-btn:hover {
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.5);
  transform: translateY(-1px);
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  cursor: pointer;
  position: relative;
  z-index: 1001;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all 0.3s ease;
  position: absolute;
  left: 11px;
}

.nav-toggle span {
  top: 21px;
}

.nav-toggle span::before {
  top: -7px;
}

.nav-toggle span::after {
  top: 7px;
}

.nav-toggle.active span {
  background: transparent;
}

.nav-toggle.active span::before {
  transform: rotate(45deg);
  top: 0;
  background: var(--primary);
}

.nav-toggle.active span::after {
  transform: rotate(-45deg);
  top: 0;
  background: var(--primary);
}

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  padding: 140px 0 60px;
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 15, 26, 0.92) 20%, rgba(11, 15, 26, 0.75) 55%, rgba(123, 97, 255, 0.25) 100%);
  z-index: 1;
}

.page-hero .container {
  position: relative;
  z-index: 2;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--text-sub);
  transition: color 0.2s ease;
}

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

.breadcrumb-sep {
  color: rgba(255, 255, 255, 0.3);
}

.breadcrumb .current {
  color: var(--text-main);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  max-width: 260px;
}

.page-hero h1 {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.35), 0 0 60px rgba(0, 229, 255, 0.12);
  max-width: 860px;
}

.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 14px;
  color: var(--text-sub);
}

.cate-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--primary);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 100px;
}

.post-meta time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.post-meta .meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ===== Article Layout ===== */
.article-wrap {
  padding: 48px 0 80px;
}

.article-main {
  max-width: 800px;
  margin: 0 auto;
}

.article-body {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 48px;
  box-shadow: var(--shadow-card);
  font-size: 16px;
  line-height: 1.8;
  color: #d3dce8;
}

.article-body h2 {
  font-size: 28px;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--text-main);
  line-height: 1.4;
}

.article-body h3 {
  font-size: 22px;
  font-weight: 600;
  margin: 32px 0 14px;
  color: var(--text-main);
  line-height: 1.4;
}

.article-body h4 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--text-main);
}

.article-body p {
  margin-bottom: 18px;
}

.article-body a {
  color: var(--primary);
  border-bottom: 1px dashed rgba(0, 229, 255, 0.4);
  transition: all 0.2s ease;
}

.article-body a:hover {
  color: #fff;
  border-bottom-color: var(--primary);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
}

.article-body img {
  border-radius: 12px;
  margin: 24px 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.article-body blockquote {
  margin: 24px 0;
  padding: 16px 24px;
  border-left: 3px solid var(--primary);
  background: rgba(0, 229, 255, 0.06);
  border-radius: 0 12px 12px 0;
  color: #a8b6c8;
  font-style: normal;
}

.article-body ul,
.article-body ol {
  margin: 16px 0 20px;
  padding-left: 8px;
}

.article-body li {
  margin-bottom: 8px;
}

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

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}

.article-body th,
.article-body td {
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 16px;
  text-align: left;
}

.article-body th {
  background: rgba(0, 229, 255, 0.08);
  color: var(--primary);
  font-weight: 600;
}

.article-body code {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 14px;
  background: rgba(0, 229, 255, 0.08);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--primary);
}

.article-body pre {
  background: #0E1322;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: #d3dce8;
}

.article-empty {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 80px 40px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.article-empty p {
  font-size: 20px;
  color: var(--text-sub);
  margin-bottom: 24px;
}

.article-empty .btn-primary {
  display: inline-block;
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #00E5FF, #7B61FF);
  border-radius: var(--radius-btn);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
  transition: all 0.3s ease;
}

.article-empty .btn-primary:hover {
  box-shadow: 0 0 32px rgba(0, 229, 255, 0.5);
  transform: translateY(-2px);
}

/* ===== Post Nav ===== */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}

.post-nav-btn {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-card);
  transition: all 0.3s ease;
}

.post-nav-btn:hover {
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.post-nav-btn.next {
  text-align: right;
}

.post-nav-label {
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
}

.post-nav-title {
  font-size: 15px;
  color: var(--text-main);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-weight: 500;
}

/* ===== Related Section ===== */
.related-section {
  padding: 80px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(19, 26, 42, 0.4) 100%);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 36px;
  gap: 20px;
}

.section-title {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.section-title span {
  color: var(--primary);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
}

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

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.25);
  box-shadow: var(--shadow-hover);
}

.related-card .thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #0E1322;
}

.related-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.related-card .card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.related-card .card-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--primary);
  background: rgba(0, 229, 255, 0.08);
  border-radius: 100px;
}

.related-card h3 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-main);
  transition: color 0.2s ease;
}

.related-card:hover h3 {
  color: var(--primary);
}

.related-card p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-card .card-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s ease;
}

.related-card .card-link:hover {
  gap: 8px;
}

/* ===== FAQ ===== */
.faq-section {
  padding: var(--spacer) 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
}

.faq-item:first-child {
  border-top: 1px solid rgba(0, 229, 255, 0.08);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 8px;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  color: var(--text-main);
  cursor: pointer;
  transition: color 0.25s ease;
}

.faq-q:hover {
  color: var(--primary);
}

.faq-q .icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--primary);
  transition: all 0.3s ease;
}

.faq-item.open .faq-q {
  color: var(--primary);
}

.faq-item.open .icon {
  transform: rotate(45deg);
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--primary);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-a-inner {
  padding: 0 8px 20px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

.question-mark {
  width: 2px;
  background: none;
  transition: background 0.3s ease;
}

.faq-item.open .question-mark {
  background: var(--primary);
}

/* ===== CTA Section ===== */
.cta-section {
  position: relative;
  padding: 80px 0;
  background: linear-gradient(135deg, #00E5FF 0%, #7B61FF 50%, #FF2D95 100%);
  overflow: hidden;
  text-align: center;
}

.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%),
              linear-gradient(-45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%);
  background-size: 40px 40px;
}

.cta-section .container {
  position: relative;
  z-index: 2;
}

.cta-title {
  font-size: 34px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.cta-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
}

.cta-btn {
  display: inline-block;
  padding: 16px 48px;
  font-size: 16px;
  font-weight: 700;
  color: #0B0F1A;
  background: #fff;
  border-radius: 100px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}

.cta-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 36px rgba(0, 0, 0, 0.3);
  color: #0B0F1A;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid transparent;
  border-image: linear-gradient(90deg, #00E5FF 0%, #7B61FF 50%, #FF2D95 100%) 1;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 48px;
}

.footer-brand .logo {
  font-size: 20px;
  margin-bottom: 12px;
  display: inline-block;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.footer-col a:hover {
  color: var(--primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 13px;
  color: var(--text-sub);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 229, 255, 0.2);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 229, 255, 0.4);
}

::selection {
  background: rgba(0, 229, 255, 0.3);
  color: #fff;
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

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

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 360px;
    height: 100vh;
    background: rgba(11, 15, 26, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 100px 40px 40px;
    gap: 6px;
    transition: right 0.4s ease;
    border-left: 1px solid var(--border-glow);
    box-shadow: -20px 0 60px rgba(0, 0, 0, 0.5);
    z-index: 1000;
  }

  .main-nav.open {
    right: 0;
  }

  .nav-link {
    font-size: 18px;
    padding: 14px 8px;
    width: 100%;
  }

  .nav-link::after {
    left: 8px;
    right: auto;
    width: 28px;
  }

  .nav-btn {
    margin-top: 16px;
    width: 100%;
    text-align: center;
    padding: 14px;
    font-size: 16px;
  }

  .page-hero {
    padding: 120px 0 40px;
  }

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

  .article-body {
    padding: 32px 24px;
  }

  .article-body h2 {
    font-size: 24px;
  }

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

  .post-nav {
    grid-template-columns: 1fr;
  }

  .post-nav-btn.next {
    text-align: left;
  }

  .section-title {
    font-size: 26px;
  }

  .cta-title {
    font-size: 26px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .footer-brand {
    grid-column: auto;
  }
}

@media (max-width: 575px) {
  .page-hero h1 {
    font-size: 28px;
  }

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

  .breadcrumb .current {
    max-width: 160px;
  }

  .article-body {
    padding: 24px 18px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* roulang page: category1 */
/* ===== Design Tokens ===== */
  :root {
    --primary: #00E5FF;
    --accent: #FF2D95;
    --purple: #7B61FF;
    --bg: #0B0F1A;
    --bg-deep: #070A12;
    --card: #131A2A;
    --text: #E8F0F8;
    --text-sub: #8892A6;
    --border: rgba(0, 229, 255, 0.12);
    --border-hover: rgba(0, 229, 255, 0.28);
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 8px 30px rgba(0, 229, 255, 0.15);
    --font: system-ui, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --max-w: 1200px;
    --spacer: 90px;
    --transition: all 0.3s ease;
  }

  /* ===== Reset & Base ===== */
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  body.nav-locked {
    overflow: hidden;
  }

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

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

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

  ul,
  ol {
    list-style: none;
  }

  h1,
  h2,
  h3,
  h4 {
    line-height: 1.25;
    font-weight: 700;
    letter-spacing: -0.02em;
  }

  h1 {
    font-size: clamp(32px, 5vw, 48px);
  }

  h2 {
    font-size: clamp(24px, 3.4vw, 34px);
    margin-bottom: 12px;
  }

  h3 {
    font-size: clamp(18px, 2vw, 22px);
    font-weight: 600;
  }

  p {
    color: var(--text-sub);
    line-height: 1.8;
  }

  .container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
  }

  /* ===== Page Background ===== */
  .page-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
      radial-gradient(ellipse 600px 400px at 15% 10%, rgba(0, 229, 255, 0.08), transparent 60%),
      radial-gradient(ellipse 800px 500px at 85% 80%, rgba(123, 97, 255, 0.08), transparent 60%),
      linear-gradient(rgba(0, 229, 255, 0.025) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0, 229, 255, 0.025) 1px, transparent 1px);
    background-size: auto, auto, 60px 60px, 60px 60px;
  }

  main {
    position: relative;
    z-index: 1;
  }

  /* ===== Button ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.2;
    transition: var(--transition);
    white-space: nowrap;
  }

  .btn i {
    font-size: 14px;
  }

  .btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--purple));
    color: #04121A;
    box-shadow: 0 4px 20px rgba(0, 229, 255, 0.25);
  }

  .btn-primary:hover {
    box-shadow: 0 6px 32px rgba(0, 229, 255, 0.45);
    transform: translateY(-2px);
    filter: brightness(1.08);
    color: #04121A;
  }

  .btn-ghost {
    border: 1px solid var(--border);
    color: var(--text);
    background: rgba(19, 26, 42, 0.6);
  }

  .btn-ghost:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
    transform: translateY(-2px);
  }

  .btn-lg {
    padding: 17px 40px;
    font-size: 16px;
  }

  .btn-block {
    width: 100%;
  }

  /* ===== Section ===== */
  .section {
    padding: var(--spacer) 0;
  }

  .section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 48px;
  }

  .section-head.left {
    text-align: left;
    margin: 0 0 32px;
  }

  .section-head h2 {
    position: relative;
    display: inline-block;
  }

  .section-head h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 48px;
    height: 3px;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--primary), var(--purple));
    box-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
  }

  .section-head.center h2::after {
    left: 50%;
    transform: translateX(-50%);
  }

  .section-head p {
    margin-top: 18px;
    font-size: 15px;
  }

  /* ===== Header ===== */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: 72px;
    background: rgba(11, 15, 26, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
  }

  .site-header::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--purple) 50%, var(--accent) 100%);
    opacity: 0.55;
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
  }

  .logo {
    font-size: 21px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
    text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
    position: relative;
    z-index: 1001;
  }

  .logo:hover {
    color: var(--primary);
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
  }

  .nav-link {
    display: inline-block;
    padding: 8px 16px;
    font-size: 15px;
    color: var(--text);
    border-radius: 8px;
    position: relative;
    transition: var(--transition);
  }

  .nav-link::after {
    content: '';
    position: absolute;
    left: 16px;
    right: 16px;
    bottom: 2px;
    height: 2px;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transform: scaleX(0.4);
    transition: var(--transition);
  }

  .nav-link:hover {
    color: var(--primary);
    text-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
  }

  .nav-link.active {
    color: var(--primary);
    text-shadow: 0 0 14px rgba(0, 229, 255, 0.6);
  }

  .nav-link.active::after {
    opacity: 1;
    transform: scaleX(1);
  }

  .nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: 12px;
    padding: 9px 22px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    color: #04121A;
    background: linear-gradient(135deg, var(--primary), var(--purple));
    box-shadow: 0 0 18px rgba(0, 229, 255, 0.25);
    transition: var(--transition);
  }

  .nav-btn:hover {
    box-shadow: 0 0 30px rgba(0, 229, 255, 0.5);
    transform: translateY(-1px);
    color: #04121A;
  }

  .nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: 8px;
    position: relative;
    z-index: 1001;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
  }

  .nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text);
    border-radius: 4px;
    transition: var(--transition);
  }

  .nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* ===== Category Hero ===== */
  .cat-hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    padding: 150px 0 90px;
    background:
      radial-gradient(ellipse 500px 300px at 20% 25%, rgba(0, 229, 255, 0.22), transparent 60%),
      radial-gradient(ellipse 700px 400px at 80% 80%, rgba(123, 97, 255, 0.25), transparent 60%),
      linear-gradient(180deg, rgba(11, 15, 26, 0.88) 0%, rgba(11, 15, 26, 0.94) 100%),
      url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
    overflow: hidden;
  }

  .cat-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
      linear-gradient(180deg, rgba(11, 15, 26, 0) 30%, var(--bg) 100%),
      linear-gradient(90deg, rgba(11, 15, 26, 0.6), transparent 60%);
  }

  .cat-hero .container {
    position: relative;
    z-index: 2;
  }

  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-sub);
    margin-bottom: 24px;
  }

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

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

  .breadcrumb i {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.3);
  }

  .cat-hero h1 {
    margin-bottom: 18px;
    text-shadow: 0 0 20px rgba(0, 229, 255, 0.5), 0 0 60px rgba(0, 229, 255, 0.15);
  }

  .cat-hero h1 .grad-text {
    background: linear-gradient(90deg, var(--primary), var(--purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .cat-hero .hero-desc {
    font-size: 17px;
    color: rgba(232, 240, 248, 0.85);
    max-width: 540px;
    margin-bottom: 32px;
  }

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

  .hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 36px;
    padding-top: 26px;
    border-top: 1px solid var(--border);
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 13px;
    color: var(--text);
    background: rgba(19, 26, 42, 0.7);
    border: 1px solid var(--border);
  }

  .hero-badge i {
    color: var(--primary);
    font-size: 12px;
  }

  /* ===== Topics Section ===== */
  .topics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .topic-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: var(--border-hover);
  }

  .topic-thumb {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
  }

  .topic-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

  .topic-card:hover .topic-thumb img {
    transform: scale(1.05);
  }

  .topic-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 55%, rgba(19, 26, 42, 0.92) 100%);
  }

  .topic-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 2;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    color: #04121A;
    background: linear-gradient(135deg, var(--primary), var(--purple));
    box-shadow: 0 0 12px rgba(0, 229, 255, 0.3);
  }

  .topic-body {
    padding: 24px;
  }

  .topic-body h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
  }

  .topic-body h3 i {
    color: var(--primary);
    font-size: 18px;
    width: 22px;
    text-align: center;
  }

  .topic-body p {
    font-size: 14px;
    margin-bottom: 16px;
  }

  .card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
  }

  .card-link i {
    font-size: 12px;
    transition: transform 0.3s ease;
  }

  .card-link:hover {
    color: #fff;
    text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
  }

  .card-link:hover i {
    transform: translateX(4px);
  }

  /* ===== Value Section ===== */
  .value-section {
    padding: var(--spacer) 0;
    background: linear-gradient(180deg, var(--bg) 0%, rgba(19, 26, 42, 0.35) 100%);
    border-top: 1px solid rgba(123, 97, 255, 0.1);
    border-bottom: 1px solid rgba(123, 97, 255, 0.1);
  }

  .value-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
  }

  .value-media {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
  }

  .value-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 320px;
  }

  .value-media::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(123, 97, 255, 0.08));
  }

  .value-badge {
    position: absolute;
    right: 18px;
    bottom: 18px;
    z-index: 2;
    background: rgba(11, 15, 26, 0.88);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    text-align: center;
    backdrop-filter: blur(8px);
  }

  .value-badge .num {
    display: block;
    font-size: 30px;
    font-weight: 700;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 16px rgba(0, 229, 255, 0.5);
  }

  .value-badge span:last-child {
    font-size: 13px;
    color: var(--text-sub);
  }

  .value-points li {
    display: flex;
    gap: 16px;
    padding: 18px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .value-points li:last-child {
    border-bottom: none;
  }

  .point-icon {
    flex: 0 0 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    font-size: 17px;
    color: var(--primary);
    background: rgba(0, 229, 255, 0.08);
    border: 1px solid var(--border);
  }

  .point-text h4 {
    font-size: 16px;
    margin-bottom: 4px;
  }

  .point-text p {
    font-size: 14px;
  }

  /* ===== Flow Section ===== */
  .flow-section {
    padding: var(--spacer) 0;
  }

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

  .flow-step {
    position: relative;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px 30px;
    transition: var(--transition);
    overflow: hidden;
  }

  .flow-step:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
  }

  .flow-step::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--purple));
    opacity: 0;
    transition: var(--transition);
  }

  .flow-step:hover::before {
    opacity: 1;
  }

  .step-num {
    position: absolute;
    top: 20px;
    right: 22px;
    font-size: 44px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.06);
    font-variant-numeric: tabular-nums;
    line-height: 1;
    transition: var(--transition);
  }

  .flow-step:hover .step-num {
    color: rgba(0, 229, 255, 0.15);
  }

  .step-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 20px;
    color: var(--primary);
    background: rgba(0, 229, 255, 0.08);
    border: 1px solid var(--border);
    margin-bottom: 20px;
  }

  .flow-step h3 {
    margin-bottom: 8px;
  }

  .flow-step p {
    font-size: 14px;
  }

  /* ===== Hot Section ===== */
  .hot-section {
    padding: var(--spacer) 0;
    background: linear-gradient(180deg, var(--bg), rgba(19, 26, 42, 0.3));
  }

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

  .hot-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow);
  }

  .hot-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: var(--border-hover);
  }

  .hot-card .hot-img {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
  }

  .hot-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

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

  .hot-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(19, 26, 42, 0.85) 100%);
  }

  .hot-body {
    padding: 24px;
  }

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

  .tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(0, 229, 255, 0.08);
    border: 1px solid rgba(0, 229, 255, 0.2);
  }

  .hot-views {
    font-size: 13px;
    color: var(--text-sub);
    display: inline-flex;
    align-items: center;
    gap: 5px;
  }

  .hot-body h3 {
    font-size: 17px;
    margin-bottom: 8px;
    transition: var(--transition);
  }

  .hot-card:hover .hot-body h3 {
    color: var(--primary);
  }

  .hot-body p {
    font-size: 14px;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  /* ===== FAQ ===== */
  .faq-section {
    padding: var(--spacer) 0;
  }

  .faq-list {
    max-width: 800px;
    margin: 0 auto;
  }

  .faq-item {
    margin-bottom: 14px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
  }

  .faq-item:hover {
    border-color: rgba(0, 229, 255, 0.2);
  }

  .faq-item.active {
    border-color: rgba(0, 229, 255, 0.3);
    box-shadow: 0 4px 20px rgba(0, 229, 255, 0.08);
  }

  .faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    transition: var(--transition);
  }

  .faq-question span {
    position: relative;
    padding-left: 18px;
  }

  .faq-question span::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
  }

  .faq-question i {
    flex: 0 0 auto;
    color: var(--text-sub);
    transition: transform 0.3s ease;
  }

  .faq-item.active .faq-question {
    color: var(--primary);
  }

  .faq-item.active .faq-question i {
    transform: rotate(180deg);
    color: var(--primary);
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .faq-answer-inner {
    padding: 0 24px 20px;
  }

  .faq-answer-inner p {
    font-size: 14px;
    border-left: 2px solid var(--primary);
    padding-left: 16px;
    color: var(--text-sub);
  }

  /* ===== Bottom CTA ===== */
  .bottom-cta {
    position: relative;
    padding: 90px 0;
    background:
      radial-gradient(ellipse 600px 300px at 50% 0%, rgba(0, 229, 255, 0.18), transparent 70%),
      radial-gradient(ellipse 600px 300px at 80% 100%, rgba(255, 45, 149, 0.12), transparent 70%),
      linear-gradient(135deg, #0E1A2E, #121026);
    border-top: 1px solid rgba(0, 229, 255, 0.15);
    border-bottom: 1px solid rgba(255, 45, 149, 0.15);
    text-align: center;
    overflow: hidden;
  }

  .bottom-cta::before {
    content: '';
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 200px;
    background: radial-gradient(ellipse, rgba(0, 229, 255, 0.15), transparent 70%);
    pointer-events: none;
  }

  .bottom-cta .container {
    position: relative;
    z-index: 2;
  }

  .bottom-cta h2 {
    font-size: clamp(26px, 4vw, 36px);
    margin-bottom: 14px;
    text-shadow: 0 0 18px rgba(0, 229, 255, 0.25);
  }

  .bottom-cta p {
    font-size: 16px;
    color: rgba(232, 240, 248, 0.8);
    margin-bottom: 34px;
  }

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

  /* ===== Footer ===== */
  .site-footer {
    background: var(--bg-deep);
    border-top: 1px solid transparent;
    position: relative;
    z-index: 1;
  }

  .site-footer::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--primary), var(--purple), var(--accent));
    opacity: 0.5;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    padding: 60px 0 40px;
  }

  .footer-brand .logo {
    font-size: 22px;
    margin-bottom: 12px;
  }

  .footer-brand p {
    font-size: 14px;
    max-width: 300px;
    margin-top: 12px;
  }

  .footer-col h4 {
    font-size: 15px;
    color: var(--text);
    margin-bottom: 14px;
  }

  .footer-col ul li {
    margin-bottom: 8px;
  }

  .footer-col ul li a {
    font-size: 14px;
    color: var(--text-sub);
    transition: var(--transition);
  }

  .footer-col ul li a:hover {
    color: var(--primary);
  }

  .footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 13px;
    color: var(--text-sub);
  }

  .footer-bottom .copylink {
    color: var(--text-sub);
    transition: var(--transition);
  }

  .footer-bottom .copylink:hover {
    color: var(--primary);
  }

  /* ===== Reveal Animation ===== */
  .reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  @media (prefers-reduced-motion: no-preference) {
    .reveal[data-reveal] {
      opacity: 0;
      transform: translateY(12px);
    }

    .reveal[data-reveal].in-view {
      opacity: 1;
      transform: none;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    * {
      animation: none !important;
      transition-duration: 0.01ms !important;
    }

    html {
      scroll-behavior: auto;
    }
  }

  /* ===== Responsive ===== */
  @media (max-width: 1200px) {
    .topics-grid {
      grid-template-columns: repeat(3, 1fr);
    }

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

    .footer-grid {
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
    }
  }

  @media (max-width: 992px) {
    .main-nav {
      position: fixed;
      top: 0;
      right: -100%;
      width: min(360px, 85vw);
      height: 100vh;
      background: rgba(11, 15, 26, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: flex-start;
      justify-content: center;
      padding: 80px 36px 40px;
      gap: 18px;
      transition: right 0.35s ease;
      box-shadow: -20px 0 50px rgba(0, 0, 0, 0.4);
      border-left: 1px solid var(--border);
    }

    .main-nav.open {
      right: 0;
    }

    .nav-toggle {
      display: flex;
    }

    .nav-link {
      font-size: 17px;
      padding: 10px 0;
      width: 100%;
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }

    .nav-link::after {
      left: 0;
      right: auto;
      width: 42px;
    }

    .nav-btn {
      margin: 16px 0 0;
      width: 100%;
      justify-content: center;
    }

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

    .value-media img {
      min-height: 260px;
    }
  }

  @media (max-width: 768px) {
    :root {
      --spacer: 60px;
    }

    .topics-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .flow-grid {
      grid-template-columns: 1fr;
      gap: 16px;
    }

    .hot-grid {
      grid-template-columns: 1fr;
      gap: 16px;
    }

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

    .footer-brand {
      grid-column: 1 / -1;
    }

    .cat-hero {
      min-height: 460px;
      padding: 130px 0 70px;
    }

    .hero-badges {
      gap: 8px;
    }
  }

  @media (max-width: 575px) {
    .container {
      padding: 0 16px;
    }

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

    .topic-thumb {
      aspect-ratio: 16 / 9;
    }

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

    .footer-bottom {
      flex-direction: column;
      text-align: center;
      justify-content: center;
    }

    .cat-hero h1 {
      font-size: 30px;
    }

    .hero-desc {
      font-size: 15px;
    }

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

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

    .section-head {
      margin-bottom: 32px;
    }
  }

/* roulang page: category2 */
:root {
      --primary: #00E5FF;
      --accent: #FF2D95;
      --purple: #7B61FF;
      --bg: #0B0F1A;
      --card: #131A2A;
      --panel: #0E1322;
      --text: #E8F0F8;
      --muted: #8892A6;
      --border: rgba(0, 229, 255, 0.12);
      --border-strong: rgba(0, 229, 255, 0.25);
      --grad: linear-gradient(135deg, #00E5FF 0%, #7B61FF 100%);
      --grad-full: linear-gradient(135deg, #00E5FF 0%, #7B61FF 50%, #FF2D95 100%);
      --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
      --shadow-glow: 0 8px 30px rgba(0, 229, 255, 0.15);
      --radius: 12px;
      --radius-lg: 16px;
      --radius-btn: 8px;
      --space-section: 90px;
      --font-main: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
      --nav-h: 72px;
    }

    *,
    *::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);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    body.no-scroll {
      overflow: hidden;
    }

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

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

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

    ul,
    ol {
      list-style: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section-pad {
      padding: var(--space-section) 0;
    }

    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-head .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 5px 16px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: rgba(0, 229, 255, 0.05);
      color: var(--primary);
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 14px;
    }

    .section-head .eyebrow::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 10px var(--primary);
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.25;
      margin-bottom: 12px;
    }

    .section-subtitle {
      color: var(--muted);
      font-size: 15px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-size: 15px;
      font-weight: 600;
      line-height: 1;
      transition: all 0.3s ease;
      position: relative;
      z-index: 1;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--grad);
      color: #fff;
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
    }

    .btn-primary:hover {
      box-shadow: 0 0 38px rgba(0, 229, 255, 0.5);
      transform: translateY(-2px);
      filter: brightness(1.08);
    }

    .btn-secondary {
      background: transparent;
      color: var(--text);
      border: 1px solid var(--border-strong);
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
      transform: translateY(-2px);
    }

    .btn-lg {
      padding: 20px 42px;
      font-size: 17px;
      border-radius: 10px;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.35);
      color: #fff;
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: 0 0 24px rgba(0, 229, 255, 0.2);
    }

    /* Header */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      height: var(--nav-h);
      background: rgba(11, 15, 26, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.08);
    }

    .site-header::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: -1px;
      height: 1px;
      background: linear-gradient(90deg, #00E5FF 0%, #7B61FF 50%, #FF2D95 100%);
      opacity: 0.45;
    }

    .header-inner {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .brand {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: #fff;
      text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand:hover {
      text-shadow: 0 0 24px rgba(0, 229, 255, 0.8);
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      height: var(--nav-h);
      padding: 0 18px;
      font-size: 15px;
      color: var(--text);
      position: relative;
      transition: color 0.3s ease;
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 18px;
      right: 18px;
      bottom: 0;
      height: 2px;
      background: var(--grad-full);
      border-radius: 2px;
      opacity: 0;
      transform: scaleX(0.5);
      transition: all 0.3s ease;
    }

    .nav-link:hover {
      color: var(--primary);
      text-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
    }

    .nav-link.active {
      color: var(--primary);
      text-shadow: 0 0 14px rgba(0, 229, 255, 0.5);
    }

    .nav-link.active::after {
      opacity: 1;
      transform: scaleX(1);
    }

    .nav-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      height: 40px;
      padding: 0 24px;
      margin-left: 14px;
      background: var(--grad);
      color: #fff;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 0 18px rgba(0, 229, 255, 0.22);
      transition: all 0.3s ease;
      white-space: nowrap;
    }

    .nav-btn:hover {
      box-shadow: 0 0 34px rgba(0, 229, 255, 0.55);
      transform: translateY(-2px);
      filter: brightness(1.08);
    }

    .nav-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border-radius: 8px;
      border: 1px solid var(--border);
      background: rgba(0, 229, 255, 0.05);
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 5px;
      transition: border-color 0.3s;
    }

    .nav-toggle:hover {
      border-color: var(--primary);
    }

    .nav-toggle span {
      width: 20px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: transform 0.3s ease, opacity 0.3s ease;
    }

    body.nav-open .nav-toggle span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

    body.nav-open .nav-toggle span:nth-child(2) {
      opacity: 0;
    }

    body.nav-open .nav-toggle span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    /* Hero */
    .category-hero {
      position: relative;
      min-height: 68vh;
      display: flex;
      align-items: center;
      padding-top: calc(var(--nav-h) + 48px);
      padding-bottom: 64px;
      overflow: hidden;
      background:
        radial-gradient(ellipse at 20% 20%, rgba(0, 229, 255, 0.16), transparent 50%),
        radial-gradient(ellipse at 85% 80%, rgba(123, 97, 255, 0.18), transparent 50%),
        linear-gradient(135deg, #070A12 0%, #0B0F1A 50%, #101428 100%);
    }

    .category-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url("/assets/images/backpic/back-2.png");
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      opacity: 0.25;
      pointer-events: none;
    }

    .category-hero::after {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 780px;
    }

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

    .breadcrumb a {
      color: var(--muted);
      transition: color 0.3s;
    }

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

    .breadcrumb span {
      color: rgba(0, 229, 255, 0.8);
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 999px;
      background: rgba(0, 229, 255, 0.08);
      border: 1px solid var(--border-strong);
      color: var(--primary);
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 20px;
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.08);
    }

    .hero-pill::before {
      content: "●";
      font-size: 8px;
      animation: pulse 2s infinite ease-in-out;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.4; }
    }

    .category-hero h1 {
      font-size: 46px;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 18px;
      text-shadow:
        0 0 20px rgba(0, 229, 255, 0.45),
        0 0 60px rgba(0, 229, 255, 0.15);
    }

    .category-hero p.lead {
      font-size: 18px;
      color: var(--muted);
      margin-bottom: 32px;
      max-width: 620px;
      line-height: 1.7;
    }

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

    .hero-scroll {
      position: absolute;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: 28px;
      height: 48px;
      border: 1px solid var(--border-strong);
      border-radius: 999px;
      display: flex;
      justify-content: center;
      padding-top: 10px;
      animation: scrollHint 2s infinite ease-in-out;
      z-index: 3;
    }

    .hero-scroll::before {
      content: "";
      width: 4px;
      height: 8px;
      border-radius: 4px;
      background: var(--primary);
      box-shadow: 0 0 10px var(--primary);
    }

    @keyframes scrollHint {
      0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.8; }
      50% { transform: translateX(-50%) translateY(8px); opacity: 1; }
    }

    /* Feature cards */
    .feature-section {
      background: var(--bg);
      position: relative;
    }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px 28px;
      backdrop-filter: blur(6px);
      transition: all 0.35s ease;
      position: relative;
      overflow: hidden;
    }

    .feature-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--grad-full);
      opacity: 0.3;
      transition: opacity 0.3s;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-glow);
      border-color: var(--border-strong);
      transform: translateY(-4px);
    }

    .feature-card:hover::before {
      opacity: 1;
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.12), rgba(123, 97, 255, 0.15));
      border: 1px solid var(--border-strong);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 22px;
      color: var(--primary);
      box-shadow: 0 0 18px rgba(0, 229, 255, 0.06);
    }

    .feature-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 10px;
      letter-spacing: -0.01em;
    }

    .feature-card p {
      font-size: 14px;
      color: var(--muted);
      line-height: 1.7;
    }

    /* Scene grid */
    .scene-section {
      background: linear-gradient(180deg, var(--bg) 0%, #090D18 100%);
      position: relative;
    }

    .scene-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .scene-card {
      background: var(--card);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      transition: all 0.35s ease;
      display: flex;
      flex-direction: column;
    }

    .scene-card:hover {
      border-color: var(--border-strong);
      box-shadow: var(--shadow-glow);
      transform: translateY(-5px);
    }

    .scene-card .thumb {
      aspect-ratio: 4 / 3;
      overflow: hidden;
      position: relative;
      background: var(--panel);
    }

    .scene-card .thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .scene-card:hover .thumb img {
      transform: scale(1.06);
    }

    .scene-card .thumb::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, transparent 55%, rgba(11, 15, 26, 0.65) 100%);
    }

    .scene-card .card-tag {
      position: absolute;
      top: 14px;
      left: 14px;
      z-index: 2;
      padding: 4px 12px;
      border-radius: 999px;
      background: rgba(0, 229, 255, 0.15);
      border: 1px solid rgba(0, 229, 255, 0.3);
      color: var(--primary);
      font-size: 12px;
      backdrop-filter: blur(8px);
    }

    .scene-card .card-body {
      padding: 22px 22px 26px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .scene-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .scene-card p {
      font-size: 14px;
      color: var(--muted);
      line-height: 1.7;
      margin-bottom: 18px;
      flex: 1;
    }

    .scene-card .card-link {
      color: var(--primary);
      font-size: 14px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.3s;
    }

    .scene-card .card-link:hover {
      gap: 12px;
    }

    /* Info flow */
    .flow-section {
      background: var(--bg);
    }

    .flow-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .flow-steps {
      display: flex;
      flex-direction: column;
      gap: 0;
    }

    .flow-step {
      display: flex;
      gap: 20px;
      position: relative;
      padding-bottom: 36px;
    }

    .flow-step:last-child {
      padding-bottom: 0;
    }

    .flow-step .step-num {
      flex-shrink: 0;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--card);
      border: 1px solid var(--border-strong);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      color: var(--primary);
      position: relative;
      z-index: 2;
      box-shadow: 0 0 16px rgba(0, 229, 255, 0.1);
      font-variant-numeric: tabular-nums;
    }

    .flow-step:not(:last-child) .step-num::after {
      content: "";
      position: absolute;
      top: 48px;
      left: 50%;
      width: 1px;
      height: calc(100% + 36px);
      background: linear-gradient(180deg, rgba(0, 229, 255, 0.4), rgba(0, 229, 255, 0.05));
    }

    .flow-step .step-content h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .flow-step .step-content p {
      font-size: 14px;
      color: var(--muted);
      line-height: 1.7;
    }

    .flow-panel {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
    }

    .flow-panel::before {
      content: "";
      position: absolute;
      top: -60px;
      right: -60px;
      width: 160px;
      height: 160px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0, 229, 255, 0.14), transparent 70%);
    }

    .flow-panel h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .stat-item {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 22px 20px;
      text-align: center;
    }

    .stat-item .stat-num {
      font-size: 34px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
      font-variant-numeric: tabular-nums;
      text-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
    }

    .stat-item .stat-label {
      font-size: 13px;
      color: var(--muted);
      margin-top: 6px;
    }

    .flow-note {
      margin-top: 24px;
      padding: 14px 16px;
      border-radius: 8px;
      background: rgba(123, 97, 255, 0.08);
      border: 1px solid rgba(123, 97, 255, 0.2);
      font-size: 13px;
      color: var(--muted);
      display: flex;
      gap: 10px;
      align-items: flex-start;
    }

    .flow-note strong {
      color: var(--text);
    }

    /* Mid CTA */
    .mid-cta {
      position: relative;
      padding: 110px 0;
      background:
        radial-gradient(ellipse at 15% 30%, rgba(0, 229, 255, 0.16), transparent 45%),
        radial-gradient(ellipse at 85% 70%, rgba(255, 45, 149, 0.12), transparent 42%),
        linear-gradient(135deg, #080C14 0%, #101430 100%);
      text-align: center;
      overflow: hidden;
    }

    .mid-cta::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url("/assets/images/backpic/back-3.webp");
      background-size: cover;
      background-position: center;
      opacity: 0.1;
    }

    .mid-cta .container {
      position: relative;
      z-index: 2;
    }

    .mid-cta h2 {
      font-size: 36px;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      text-shadow: 0 0 30px rgba(0, 229, 255, 0.25);
    }

    .mid-cta p {
      color: var(--muted);
      font-size: 16px;
      max-width: 580px;
      margin: 0 auto 32px;
    }

    .mid-cta .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* FAQ */
    .faq-section {
      background: var(--bg);
    }

    .faq-list {
      max-width: 820px;
      margin: 0 auto;
      border-top: 1px solid rgba(0, 229, 255, 0.08);
    }

    .faq-item {
      border-bottom: 1px solid rgba(0, 229, 255, 0.08);
    }

    .faq-item summary {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 22px 4px;
      cursor: pointer;
      font-size: 16px;
      font-weight: 600;
      position: relative;
      list-style: none;
      transition: color 0.3s ease;
    }

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

    .faq-item summary::after {
      content: "+";
      font-size: 24px;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.3s ease;
      flex-shrink: 0;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      border: 1px solid var(--border-strong);
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(0, 229, 255, 0.05);
    }

    .faq-item[open] summary {
      color: var(--primary);
      text-shadow: 0 0 12px rgba(0, 229, 255, 0.25);
    }

    .faq-item[open] summary::after {
      transform: rotate(45deg);
      background: rgba(0, 229, 255, 0.15);
      border-color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.32s ease;
      padding: 0 4px;
      border-left: 2px solid transparent;
    }

    .faq-item[open] .faq-answer {
      max-height: 600px;
      padding-left: 16px;
      border-left-color: var(--primary);
    }

    .faq-answer p {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.8;
      padding-bottom: 24px;
    }

    /* Download CTA */
    .download-cta {
      position: relative;
      padding: 90px 0;
      text-align: center;
      background:
        radial-gradient(ellipse at 50% 0%, rgba(0, 229, 255, 0.1), transparent 60%),
        radial-gradient(ellipse at 50% 100%, rgba(123, 97, 255, 0.12), transparent 60%),
        var(--bg);
      border-top: 1px solid var(--border);
    }

    .download-cta h2 {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 14px;
      letter-spacing: -0.02em;
    }

    .download-cta p {
      color: var(--muted);
      max-width: 540px;
      margin: 0 auto 34px;
      font-size: 15px;
    }

    .download-cta .btn-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }

    .version-note {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      flex-wrap: wrap;
      font-size: 13px;
      color: var(--muted);
    }

    .version-note .badge {
      padding: 4px 12px;
      border-radius: 999px;
      background: rgba(0, 229, 255, 0.08);
      border: 1px solid var(--border-strong);
      color: var(--primary);
      font-weight: 500;
    }

    /* Footer */
    .site-footer {
      background: #070A12;
      border-top: 1px solid var(--border);
      padding: 70px 0 30px;
      position: relative;
    }

    .site-footer::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 1px;
      background: var(--grad-full);
      opacity: 0.5;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 50px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .footer-brand .logo {
      font-size: 20px;
      font-weight: 700;
      color: #fff;
      text-shadow: 0 0 14px rgba(0, 229, 255, 0.4);
      margin-bottom: 14px;
    }

    .footer-brand p {
      font-size: 13px;
      color: var(--muted);
      line-height: 1.8;
      max-width: 280px;
    }

    .footer-col h4 {
      font-size: 14px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 18px;
      letter-spacing: 0.02em;
    }

    .footer-col ul li {
      margin-bottom: 12px;
    }

    .footer-col ul a {
      font-size: 13px;
      color: var(--muted);
      transition: color 0.3s;
    }

    .footer-col ul a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      padding-top: 26px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      font-size: 13px;
      color: var(--muted);
    }

    .footer-bottom .copyright {
      color: var(--muted);
    }

    /* Responsive */
    @media (max-width: 1199px) {
      .feature-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
      }

      .scene-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
      }

      .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
        gap: 30px;
      }
    }

    @media (max-width: 991px) {
      :root {
        --space-section: 72px;
      }

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

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

      .flow-wrap {
        grid-template-columns: 1fr;
        gap: 48px;
      }

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

      .main-nav {
        position: fixed;
        top: var(--nav-h);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(11, 15, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 40px;
        gap: 8px;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        z-index: 999;
      }

      body.nav-open .main-nav {
        transform: translateX(0);
      }

      .main-nav .nav-link {
        height: 56px;
        font-size: 18px;
        width: 100%;
        justify-content: center;
      }

      .main-nav .nav-link::after {
        left: 40%;
        right: 40%;
      }

      .main-nav .nav-btn {
        margin: 16px 0 0;
        height: 48px;
        font-size: 16px;
        padding: 0 36px;
      }

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

    @media (max-width: 767px) {
      :root {
        --space-section: 58px;
      }

      .section-title {
        font-size: 26px;
      }

      .category-hero {
        min-height: auto;
        padding-top: calc(var(--nav-h) + 40px);
        padding-bottom: 56px;
      }

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

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

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

      .feature-grid {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
      }

      .feature-card {
        padding: 24px 20px;
      }

      .scene-grid {
        grid-template-columns: 1fr;
        gap: 16px;
      }

      .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
      }

      .mid-cta {
        padding: 70px 0;
      }

      .mid-cta h2 {
        font-size: 28px;
      }

      .mid-cta .btn-group .btn {
        width: 100%;
        margin-bottom: 8px;
      }

      .download-cta h2 {
        font-size: 28px;
      }

      .download-cta .btn-group .btn {
        width: 100%;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
      }

      .footer-brand {
        grid-column: 1 / -1;
      }

      .hero-scroll {
        display: none;
      }
    }

    @media (max-width: 575px) {
      .container {
        padding: 0 18px;
      }

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

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

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

      .brand {
        font-size: 17px;
      }

      .nav-btn {
        display: none;
      }

      .main-nav .nav-btn {
        display: inline-flex;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }

/* roulang page: category3 */
:root {
            --primary: #00E5FF;
            --secondary: #FF2D95;
            --accent: #7B61FF;
            --bg: #0B0F1A;
            --bg-card: #131A2A;
            --bg-deep: #070A12;
            --bg-input: #0E1322;
            --text: #E8F0F8;
            --text-muted: #8892A6;
            --border: rgba(0, 229, 255, 0.12);
            --gradient: linear-gradient(135deg, #00E5FF, #7B61FF, #FF2D95);
            --radius: 12px;
            --radius-lg: 16px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            --shadow-glow: 0 8px 30px rgba(0, 229, 255, 0.15);
            --container: 1200px;
            --spacer: 80px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease;
        }
        a:hover {
            color: #5ef2ff;
        }

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

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

        input {
            font-family: inherit;
        }

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            height: 72px;
            background: rgba(11, 15, 26, 0.92);
            -webkit-backdrop-filter: blur(16px);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid transparent;
        }

        .site-header::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 1px;
            background: linear-gradient(90deg, #00E5FF 0%, #7B61FF 50%, #FF2D95 100%);
            opacity: 0.55;
            pointer-events: none;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #E8F0F8, #00E5FF);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 18px rgba(0, 229, 255, 0.35);
            white-space: nowrap;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .main-nav .nav-link {
            position: relative;
            padding: 10px 14px;
            font-size: 15px;
            color: var(--text);
            border-radius: 8px;
            transition: color .25s ease, background .25s ease, text-shadow .25s ease;
        }

        .main-nav .nav-link:hover {
            color: var(--primary);
            text-shadow: 0 0 12px rgba(0, 229, 255, 0.45);
            background: rgba(0, 229, 255, 0.06);
        }

        .main-nav .nav-link.active {
            color: var(--primary);
            text-shadow: 0 0 14px rgba(0, 229, 255, 0.5);
        }

        .main-nav .nav-link.active::after {
            content: "";
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            background: var(--gradient);
            border-radius: 2px;
            box-shadow: 0 0 10px rgba(0, 229, 255, 0.6);
        }

        .main-nav .nav-btn {
            display: inline-flex;
            align-items: center;
            padding: 9px 22px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            color: #0B0F1A;
            background: linear-gradient(135deg, #00E5FF, #7B61FF);
            transition: box-shadow .25s ease, transform .25s ease, filter .25s ease;
            margin-left: 10px;
            white-space: nowrap;
        }

        .main-nav .nav-btn:hover {
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.4);
            transform: translateY(-2px);
            filter: brightness(1.08);
            color: #0B0F1A;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 42px;
            height: 42px;
            border-radius: 8px;
            border: 1px solid rgba(0, 229, 255, 0.25);
            background: rgba(0, 229, 255, 0.05);
            align-items: center;
            transition: border-color .2s ease, background .2s ease;
        }

        .nav-toggle .bar {
            width: 20px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: transform .3s ease, opacity .3s ease;
        }

        .nav-toggle:hover {
            border-color: var(--primary);
            background: rgba(0, 229, 255, 0.1);
        }

        .nav-toggle.open .bar:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open .bar:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open .bar:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            transition: box-shadow .25s ease, transform .25s ease, filter .25s ease, background .3s ease;
            cursor: pointer;
            text-align: center;
            border: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, #00E5FF, #7B61FF);
            color: #0B0F1A;
            box-shadow: 0 4px 20px rgba(0, 229, 255, 0.25);
        }

        .btn-primary:hover {
            box-shadow: 0 8px 32px rgba(0, 229, 255, 0.45);
            transform: translateY(-3px);
            filter: brightness(1.08);
            color: #0B0F1A;
        }

        .btn-outline {
            border: 1px solid rgba(0, 229, 255, 0.4);
            color: var(--primary);
            background: rgba(0, 229, 255, 0.05);
        }

        .btn-outline:hover {
            background: rgba(0, 229, 255, 0.1);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
            transform: translateY(-2px);
            color: var(--primary);
        }

        .btn-white {
            background: #E8F0F8;
            color: #0B0F1A;
        }

        .btn-white:hover {
            background: #fff;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
            transform: translateY(-2px);
        }

        /* ===== Page Hero ===== */
        .page-hero {
            position: relative;
            padding: 170px 0 90px;
            background:
                linear-gradient(135deg, rgba(11, 15, 26, 0.92) 20%, rgba(16, 26, 48, 0.88) 60%, rgba(26, 16, 48, 0.9) 100%),
                url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            overflow: hidden;
            text-align: center;
        }

        .page-hero::before {
            content: "";
            position: absolute;
            width: 520px;
            height: 520px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.28), transparent 70%);
            top: -140px;
            left: -80px;
            pointer-events: none;
        }

        .page-hero::after {
            content: "";
            position: absolute;
            width: 440px;
            height: 440px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(123, 97, 255, 0.28), transparent 70%);
            bottom: -120px;
            right: -70px;
            pointer-events: none;
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
        }

        .page-hero h1 {
            font-size: 46px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            text-shadow: 0 0 24px rgba(0, 229, 255, 0.4), 0 0 60px rgba(0, 229, 255, 0.15);
        }

        .page-hero .hero-sub {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto 32px;
        }

        .hero-search {
            display: flex;
            max-width: 560px;
            margin: 0 auto;
            background: var(--bg-input);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 12px;
            padding: 6px;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
            transition: border-color .25s ease, box-shadow .25s ease;
        }

        .hero-search:focus-within {
            border-color: rgba(0, 229, 255, 0.5);
            box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15), 0 4px 24px rgba(0, 0, 0, 0.4);
        }

        .hero-search input {
            flex: 1;
            background: transparent;
            border: none;
            outline: none;
            padding: 12px 18px;
            color: var(--text);
            font-size: 15px;
        }

        .hero-search input::placeholder {
            color: #5a6478;
        }

        .hero-search button {
            padding: 11px 26px;
            border-radius: 8px;
            background: linear-gradient(135deg, #00E5FF, #7B61FF);
            color: #0B0F1A;
            font-size: 14px;
            font-weight: 600;
            transition: box-shadow .25s ease, filter .25s ease;
        }

        .hero-search button:hover {
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
            filter: brightness(1.1);
        }

        /* ===== Section common ===== */
        .section {
            padding: 80px 0;
        }

        .section-alt {
            background: linear-gradient(180deg, var(--bg), #0d1322, var(--bg));
        }

        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 50px;
        }

        .section-header .tag {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 30px;
            font-size: 13px;
            letter-spacing: 0.05em;
            color: var(--primary);
            border: 1px solid rgba(0, 229, 255, 0.3);
            background: rgba(0, 229, 255, 0.06);
            margin-bottom: 14px;
        }

        .section-header h2 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 15px;
        }

        /* ===== Help Services ===== */
        .help-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .help-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 26px;
            text-align: left;
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
        }

        .help-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
            border-color: rgba(0, 229, 255, 0.25);
        }

        .help-card .icon {
            width: 54px;
            height: 54px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(123, 97, 255, 0.15));
            border: 1px solid rgba(0, 229, 255, 0.2);
            color: var(--primary);
            margin-bottom: 22px;
            box-shadow: 0 0 18px rgba(0, 229, 255, 0.08);
        }

        .help-card .icon svg {
            width: 26px;
            height: 26px;
        }

        .help-card h3 {
            font-size: 19px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .help-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .help-card .more {
            font-size: 14px;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap .2s ease;
        }

        .help-card .more:hover {
            gap: 8px;
            color: #5ef2ff;
        }

        /* ===== Help Flow ===== */
        .flow-section {
            position: relative;
            overflow: hidden;
        }

        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
            z-index: 2;
        }

        .flow-step {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 30px 24px;
            position: relative;
            transition: transform .3s ease, box-shadow .3s ease;
        }

        .flow-step:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }

        .flow-step .step-num {
            font-size: 30px;
            font-weight: 700;
            background: linear-gradient(135deg, #00E5FF, #7B61FF);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 12px;
            font-variant-numeric: tabular-nums;
        }

        .flow-step h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .flow-step p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .flow-arrow {
            position: absolute;
            top: 50%;
            right: -18px;
            transform: translateY(-50%);
            z-index: 3;
            font-size: 22px;
            color: var(--primary);
            opacity: 0.5;
            pointer-events: none;
        }

        /* ===== Contact Panel ===== */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .contact-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 42px 38px;
            display: flex;
            flex-direction: column;
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
        }

        .contact-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
            border-color: rgba(0, 229, 255, 0.2);
        }

        .contact-item .icon {
            width: 58px;
            height: 58px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(123, 97, 255, 0.2));
            border: 1px solid rgba(0, 229, 255, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            margin-bottom: 22px;
        }

        .contact-item .icon svg {
            width: 26px;
            height: 26px;
        }

        .contact-item h3 {
            font-size: 21px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .contact-item .desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 24px;
            flex: 1;
        }

        .contact-item .meta {
            font-size: 13px;
            color: var(--text-muted);
            border-top: 1px solid rgba(0, 229, 255, 0.08);
            padding-top: 16px;
            margin-bottom: 20px;
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            background: var(--bg-card);
            margin-bottom: 14px;
            overflow: hidden;
            transition: border-color .25s ease, box-shadow .25s ease;
        }

        .faq-item.open {
            border-color: rgba(0, 229, 255, 0.3);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.06);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            text-align: left;
            color: var(--text);
            transition: color .25s ease;
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-item.open .faq-question {
            color: var(--primary);
        }

        .faq-question .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1px solid rgba(0, 229, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 18px;
            transition: transform .3s ease, background .3s ease, border-color .3s ease;
            color: var(--primary);
            margin-left: 16px;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: rgba(0, 229, 255, 0.1);
            border-color: var(--primary);
        }

        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        .faq-item.open .faq-body {
            max-height: 400px;
        }

        .faq-body-inner {
            padding: 0 24px 22px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
            border-left: 2px solid var(--primary);
            margin-left: 24px;
            margin-right: 24px;
            padding-left: 18px;
        }

        /* ===== Bottom CTA ===== */
        .bottom-cta {
            padding: 90px 0;
            position: relative;
            overflow: hidden;
            background: linear-gradient(120deg, #061224, #101a30 40%, #1c1030);
        }

        .bottom-cta::before {
            content: "";
            position: absolute;
            width: 480px;
            height: 480px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.3), transparent 70%);
            top: -160px;
            right: 10%;
            pointer-events: none;
        }

        .bottom-cta::after {
            content: "";
            position: absolute;
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255, 45, 149, 0.2), transparent 70%);
            bottom: -140px;
            left: 5%;
            pointer-events: none;
        }

        .bottom-cta .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .bottom-cta h2 {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 16px;
            text-shadow: 0 0 24px rgba(0, 229, 255, 0.3);
        }

        .bottom-cta p {
            font-size: 16px;
            color: var(--text-muted);
            margin-bottom: 34px;
        }

        .bottom-cta .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid rgba(0, 229, 255, 0.08);
            position: relative;
            padding: 60px 0 28px;
        }

        .site-footer::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, #00E5FF 0%, #7B61FF 50%, #FF2D95 100%);
            opacity: 0.4;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-brand .logo {
            font-size: 20px;
            margin-bottom: 14px;
            display: block;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 18px;
            color: var(--text);
        }

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

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

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

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 24px;
            font-size: 13px;
            color: var(--text-muted);
        }

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

        /* ===== Reveal Animation ===== */
        .reveal {
            opacity: 0;
            transform: translateY(16px);
            transition: opacity .6s ease, transform .6s ease;
        }

        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1199px) {
            .help-grid {
                grid-template-columns: repeat(3, 1fr);
            }

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

            .flow-arrow {
                display: none;
            }

            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
                gap: 30px;
            }
        }

        @media (max-width: 991px) {
            .help-grid {
                grid-template-columns: repeat(2, 1fr);
            }

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

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

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }

            .nav-toggle {
                display: flex;
            }

            .main-nav {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                flex-direction: column;
                align-items: stretch;
                background: rgba(11, 15, 26, 0.97);
                -webkit-backdrop-filter: blur(20px);
                backdrop-filter: blur(20px);
                padding: 24px 28px 30px;
                gap: 6px;
                border-bottom: 1px solid rgba(0, 229, 255, 0.15);
                transform: translateY(-120%);
                transition: transform .35s ease;
                z-index: 998;
            }

            .main-nav.open {
                transform: translateY(0);
            }

            .main-nav .nav-link {
                padding: 14px 16px;
                font-size: 17px;
                border-radius: 10px;
            }

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

            .main-nav .nav-btn {
                margin: 12px 0 0;
                justify-content: center;
                padding: 14px;
                font-size: 16px;
            }

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

            .footer-brand {
                grid-column: 1 / -1;
            }

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

            .page-hero {
                padding: 140px 0 70px;
            }

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

            .section-header h2 {
                font-size: 26px;
            }

            .bottom-cta h2 {
                font-size: 28px;
            }
        }

        @media (max-width: 575px) {
            .help-grid {
                grid-template-columns: 1fr;
            }

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

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

            .hero-search {
                flex-direction: column;
                gap: 6px;
            }

            .hero-search button {
                width: 100%;
            }

            .btn-group .btn {
                width: 100%;
            }

            .contact-item {
                padding: 30px 24px;
            }

            .container {
                padding: 0 18px;
            }

            .page-hero h1 {
                font-size: 28px;
            }

            .faq-question {
                font-size: 15px;
                padding: 18px 16px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }

            .reveal {
                opacity: 1;
                transform: none;
            }
        }