/* roulang page: index */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #161e2e;
  --bg-card-hover: #1c2638;
  --accent: #00d4ff;
  --accent-2: #8b5cf6;
  --accent-3: #ff3e8e;
  --text-primary: #e8eef7;
  --text-secondary: #9aa8bd;
  --text-muted: #6b7a90;
  --border: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(0, 212, 255, 0.35);
  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.12);
  --container-w: 1200px;
  --header-h: 76px;
  --transition: 0.3s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; }
ul { list-style: none; }
.container { max-width: var(--container-w); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}
.site-header::after {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  opacity: 0.7;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.35);
}
.brand-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.main-nav .nav-link {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: all var(--transition);
}
.main-nav .nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}
.main-nav .nav-link.active {
  color: var(--accent);
  text-shadow: 0 0 16px rgba(0, 212, 255, 0.4);
}
.main-nav .nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  border-radius: 3px;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.6);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #0099cc);
  color: #06121a;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}
.btn-primary:hover {
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.5);
  transform: translateY(-2px);
  color: #000;
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-accent);
  color: var(--accent);
}
.btn-ghost:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.15);
  transform: translateY(-2px);
}
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; border-radius: 8px; }
.btn:focus { outline: 3px solid rgba(0, 212, 255, 0.35); outline-offset: 2px; }
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-size: 18px;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.menu-toggle:hover { background: rgba(0, 212, 255, 0.15); }
.mobile-menu {
  display: none;
  background: rgba(10, 14, 23, 0.97);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px 20px;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  z-index: 999;
  box-shadow: var(--shadow);
}
.mobile-menu.open { display: block; }
.mobile-menu .mobile-link {
  display: block;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.mobile-menu .mobile-link:hover { background: rgba(255, 255, 255, 0.05); color: var(--text-primary); }
.mobile-menu .mobile-link.active { color: var(--accent); background: rgba(0, 212, 255, 0.08); }

/* Hero */
.hero {
  position: relative;
  padding: 110px 0 90px;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 14, 23, 0.94) 0%, rgba(10, 14, 23, 0.78) 45%, rgba(10, 14, 23, 0.55) 100%);
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(to bottom, transparent, var(--bg-primary));
  z-index: 1;
}
.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 30px;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}
.hero-badge i { font-size: 12px; }
.hero h1 {
  font-size: 52px;
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #ffffff, #e0e7ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p.lead {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 440px;
}
.stat-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 14px;
  text-align: center;
  transition: all var(--transition);
}
.stat-item:hover { border-color: var(--border-accent); box-shadow: var(--shadow-glow); }
.stat-item .stat-num {
  font-size: 26px;
  font-weight: 700;
  color: var(--accent);
  display: block;
  line-height: 1.2;
}
.stat-item .stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  display: block;
}
.hero-visual {
  position: relative;
}
.hero-visual img {
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.hero-visual::before {
  content: "";
  position: absolute;
  inset: -20px;
  border-radius: 30px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(139, 92, 246, 0.2), rgba(255, 62, 142, 0.1));
  filter: blur(40px);
  z-index: -1;
}

/* Section base */
.section { padding: 90px 0; }
.section-head { text-align: center; margin-bottom: 50px; }
.section-tag {
  display: inline-block;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(139, 92, 246, 0.12));
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 18px;
  border-radius: 30px;
  margin-bottom: 14px;
  letter-spacing: 1px;
}
.section-head h2 {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
}
.section-head p {
  color: var(--text-secondary);
  margin-top: 12px;
  font-size: 16px;
}

/* Features */
.features { background: var(--bg-primary); }
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  height: 100%;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity var(--transition);
}
.feature-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(0, 212, 255, 0.2);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(0, 212, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--accent);
  margin-bottom: 22px;
}
.feature-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.feature-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.65; }

/* Category cards */
.categories { background: var(--bg-secondary); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.category-card {
  position: relative;
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  height: 260px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.category-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.category-card:hover img { transform: scale(1.06); }
.category-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 14, 23, 0.92) 0%, rgba(10, 14, 23, 0.35) 50%, rgba(10, 14, 23, 0.15) 100%);
}
.category-card:hover { border-color: var(--border-accent); box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4); transform: translateY(-4px); }
.category-body {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px;
  z-index: 2;
}
.category-body h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.category-body p { font-size: 13px; color: var(--text-secondary); }
.category-body .arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--accent);
  margin-top: 10px;
  transition: gap var(--transition);
}
.category-card:hover .arrow { gap: 12px; }

/* Latest section */
.latest-section { background: var(--bg-primary); }
.latest-list {
  max-width: 860px;
  margin: 0 auto;
}
.news-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 12px;
  transition: all var(--transition);
}
.news-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateX(6px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
}
.news-badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  white-space: nowrap;
}
.news-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}
.news-date {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}
.news-desc {
  grid-column: 2;
  font-size: 13px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}
.empty-tip {
  text-align: center;
  padding: 50px 20px;
  color: var(--text-muted);
  font-size: 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px dashed var(--border);
}

/* Channel tabs */
.channel-section { background: var(--bg-secondary); }
.channel-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 10px 24px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--transition);
}
.tab-btn:hover { color: var(--text-primary); border-color: rgba(0, 212, 255, 0.3); }
.tab-btn.active {
  background: linear-gradient(135deg, var(--accent), #0099cc);
  color: #06121a;
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.cards-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.content-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(0, 212, 255, 0.2);
}
.content-card .card-img {
  position: relative;
  height: 160px;
  overflow: hidden;
}
.content-card .card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.content-card:hover .card-img img { transform: scale(1.05); }
.content-card .card-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 14, 23, 0.5), transparent);
}
.card-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #06121a;
  font-size: 16px;
  opacity: 0;
  transition: all var(--transition);
  z-index: 2;
}
.content-card:hover .card-play { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.card-body { padding: 18px 18px 20px; }
.card-body .card-tag {
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 6px;
  display: block;
}
.card-body h3 { font-size: 16px; font-weight: 600; line-height: 1.4; margin-bottom: 8px; }
.card-body p { font-size: 13px; color: var(--text-secondary); line-height: 1.55; }
.card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Stats & Process */
.stats-process { background: var(--bg-primary); }
.stats-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 60px;
}
.stat-box {
  text-align: center;
  padding: 34px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}
.stat-box:hover { border-color: var(--border-accent); box-shadow: var(--shadow-glow); }
.stat-box .icon {
  font-size: 28px;
  color: var(--accent);
  margin-bottom: 12px;
}
.stat-box .num {
  font-size: 32px;
  font-weight: 700;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-box .label { font-size: 13px; color: var(--text-muted); margin-top: 6px; }
.process-title {
  text-align: center;
  margin-bottom: 36px;
}
.process-title h3 { font-size: 26px; font-weight: 700; }
.process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  max-width: 900px;
  margin: 0 auto;
}
.step-item {
  text-align: center;
  padding: 30px 24px;
  position: relative;
}
.step-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.3);
}
.step-item h4 { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.step-item p { font-size: 14px; color: var(--text-secondary); }
.step-item::after {
  content: "";
  position: absolute;
  top: 56px;
  right: -15px;
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0.4;
}
.step-item:last-child::after { display: none; }

/* FAQ */
.faq-section { background: var(--bg-secondary); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item:hover { border-color: rgba(0, 212, 255, 0.2); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  text-align: left;
}
.faq-question .faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* CTA */
.cta-section {
  position: relative;
  padding: 100px 0;
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  text-align: center;
}
.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 14, 23, 0.88), rgba(10, 14, 23, 0.72));
}
.cta-section .container { position: relative; z-index: 2; }
.cta-section h2 {
  font-size: 38px;
  font-weight: 700;
  margin-bottom: 16px;
}
.cta-section p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
}
.cta-buttons { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.cta-section .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.3); }
.cta-section .btn-ghost:hover { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.6); }

/* Footer */
.site-footer {
  background: #080c14;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .brand-text { font-size: 22px; }
.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 14px;
  line-height: 1.7;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 18px;
  color: var(--text-primary);
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  color: var(--text-muted);
  font-size: 14px;
  transition: all var(--transition);
}
.footer-col ul a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 12px;
}
.footer-contact li i { color: var(--accent); width: 16px; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom p, .footer-bottom span {
  color: var(--text-muted);
  font-size: 13px;
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--accent); }

@media (max-width: 1024px) {
  .hero { padding: 80px 0 60px; }
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { max-width: 480px; }
  .cards-track { grid-template-columns: repeat(3, 1fr); }
  .stats-wrap { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .header-actions .btn { display: none; }
  .hero h1 { font-size: 36px; }
  .hero p.lead { font-size: 16px; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .cards-track { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: 1fr; gap: 20px; }
  .step-item::after { display: none; }
  .section { padding: 60px 0; }
  .section-head h2 { font-size: 26px; }
  .news-item { grid-template-columns: 1fr auto; }
  .news-desc { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 28px; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); }
  .stat-item .stat-num { font-size: 20px; }
  .cards-track { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .news-item { grid-template-columns: 1fr; gap: 8px; }
  .news-date { white-space: normal; }
  .stats-wrap { grid-template-columns: 1fr; }
  .btn-lg { padding: 12px 28px; font-size: 15px; }
  .cta-section h2 { font-size: 28px; }
  .cta-buttons .btn { width: 100%; }
}

/* roulang page: category1 */
:root {
  --primary: #00e5ff;
  --primary-dim: #00b8d4;
  --accent: #ff2d78;
  --accent-dim: #d61f63;
  --bg-deep: #0b0f1a;
  --bg-body: #0e1422;
  --bg-card: #141c2e;
  --bg-card-hover: #182236;
  --bg-soft: rgba(0, 229, 255, 0.08);
  --text-main: #e8ecf4;
  --text-muted: #94a0b5;
  --text-soft: #6b7a94;
  --border-color: #1e2940;
  --border-light: #26334d;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 24px rgba(0, 229, 255, 0.25);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s ease;
}

ul, ol {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header / Nav ===== */
.site-header {
  background: var(--bg-deep);
  border-bottom: 2px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

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

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

.brand-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  color: #fff;
  font-size: 18px;
  box-shadow: var(--shadow-glow);
}

.brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, var(--primary), #a8f0ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 20px;
}

.nav-link {
  display: inline-block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 30px;
  transition: all 0.3s ease;
  position: relative;
  border: 1px solid transparent;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(0, 229, 255, 0.08);
}

.nav-link.active {
  color: #0b0f1a;
  background: linear-gradient(135deg, var(--primary), #7ceaff);
  font-weight: 700;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.35);
  border-color: transparent;
}

.nav-link.active::before {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 3px;
  background: var(--primary);
  border-radius: 3px;
  box-shadow: 0 0 12px var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #7ceaff);
  color: #0b0f1a;
  box-shadow: 0 4px 16px rgba(0, 229, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.35);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: inset 0 0 20px rgba(0, 229, 255, 0.05);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #ff6ba0);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 45, 120, 0.25);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(255, 45, 120, 0.4);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-main);
  width: 44px;
  height: 44px;
  border-radius: 10px;
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

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

/* ===== Category Hero ===== */
.category-hero {
  position: relative;
  padding: 100px 0 80px;
  background: linear-gradient(135deg, rgba(11, 15, 26, 0.92), rgba(11, 15, 26, 0.75)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.category-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.15), transparent 60%);
  pointer-events: none;
}

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

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

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

.hero-breadcrumb .sep {
  color: var(--text-soft);
  font-size: 11px;
}

.hero-breadcrumb .current {
  color: var(--primary);
}

.category-hero .hero-content {
  max-width: 720px;
}

.category-hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 18px;
  background: linear-gradient(120deg, #ffffff, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
}

.category-hero .hero-desc {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 30px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.25);
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.tag-badge:hover {
  background: rgba(0, 229, 255, 0.2);
  box-shadow: 0 0 16px rgba(0, 229, 255, 0.15);
  transform: translateY(-1px);
}

/* ===== Channel Intro ===== */
.channel-intro {
  padding: 90px 0;
  background: var(--bg-body);
}

.intro-grid {
  display: flex;
  align-items: center;
  gap: 56px;
}

.intro-media {
  flex: 0 0 48%;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.intro-media img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.intro-media:hover img {
  transform: scale(1.03);
}

.intro-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(11, 15, 26, 0.6));
  pointer-events: none;
}

.intro-media .play-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(11, 15, 26, 0.6);
  backdrop-filter: blur(12px);
  border-radius: 30px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.intro-content {
  flex: 1;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 14px;
  padding: 4px 14px;
  border-radius: 20px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.2);
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
}

.section-title .highlight {
  color: var(--primary);
}

.intro-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 28px;
}

.intro-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.intro-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.intro-feature:hover {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.intro-feature i {
  font-size: 18px;
  color: var(--primary);
  width: 20px;
  text-align: center;
}

.intro-feature span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
}

/* ===== News List ===== */
.news-section {
  padding: 90px 0;
  background: var(--bg-deep);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 44px;
  gap: 20px;
  flex-wrap: wrap;
}

.section-header .section-title {
  margin-bottom: 8px;
  font-size: 32px;
}

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

.header-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 30px;
  border: 1px solid rgba(0, 229, 255, 0.25);
  background: rgba(0, 229, 255, 0.05);
  transition: all 0.3s ease;
}

.header-link:hover {
  background: rgba(0, 229, 255, 0.15);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
  transform: translateY(-1px);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.news-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all 0.4s ease;
}

.news-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: var(--shadow-lg);
}

.news-card-media {
  position: relative;
  overflow: hidden;
  height: 200px;
}

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

.news-card:hover .news-card-media img {
  transform: scale(1.06);
}

.news-card-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, var(--primary), #7ceaff);
  color: #0b0f1a;
  font-size: 12px;
  font-weight: 700;
  border-radius: 20px;
  box-shadow: 0 2px 8px rgba(0, 229, 255, 0.3);
}

.news-card-body {
  padding: 24px;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 12px;
}

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

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

.news-card-body h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 12px;
}

.news-card-body h3 a {
  transition: color 0.3s;
}

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

.news-card-body p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  transition: all 0.3s;
}

.news-more i {
  transition: transform 0.3s;
  font-size: 13px;
}

.news-more:hover i {
  transform: translateX(4px);
}

/* ===== Topics Section ===== */
.topics-section {
  padding: 90px 0;
  background: var(--bg-body);
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.topic-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.topic-card:hover {
  border-color: rgba(255, 45, 120, 0.35);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.topic-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(0, 229, 255, 0.1);
  color: var(--primary);
  font-size: 22px;
  flex-shrink: 0;
}

.topic-card:nth-child(2) .topic-icon {
  background: rgba(255, 45, 120, 0.1);
  color: var(--accent);
}

.topic-card:nth-child(3) .topic-icon {
  background: rgba(255, 200, 60, 0.1);
  color: #ffc83c;
}

.topic-card:nth-child(4) .topic-icon {
  background: rgba(120, 100, 255, 0.1);
  color: #9d8cff;
}

.topic-card:nth-child(5) .topic-icon {
  background: rgba(60, 220, 140, 0.1);
  color: #3cd88c;
}

.topic-card:nth-child(6) .topic-icon {
  background: rgba(255, 140, 80, 0.1);
  color: #ff8c50;
}

.topic-info h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.topic-info p {
  font-size: 13px;
  color: var(--text-muted);
}

.topic-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 32px;
}

/* ===== Stats Section ===== */
.stats-section {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(11, 15, 26, 0.95), rgba(11, 15, 26, 0.85)), url('/assets/images/backpic/back-2.png') center/cover no-repeat fixed;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
}

.stat-item {
  padding: 30px 20px;
  background: rgba(20, 28, 46, 0.7);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 229, 255, 0.15);
  transition: all 0.4s ease;
}

.stat-item:hover {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 44px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #7ceaff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* ===== FAQ Section ===== */
.faq-section {
  padding: 90px 0;
  background: var(--bg-body);
}

.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(0, 229, 255, 0.3);
}

.faq-item.active {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: var(--shadow-md);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  gap: 16px;
  transition: all 0.3s;
}

.faq-question i {
  color: var(--primary);
  font-size: 14px;
  transition: transform 0.3s;
  flex-shrink: 0;
}

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

.faq-item.active .faq-question i {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.85;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(255, 45, 120, 0.06)), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  border-top: 1px solid var(--border-color);
  position: relative;
}

.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(11, 15, 26, 0.8);
}

.cta-box {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
  padding: 40px 20px;
}

.cta-box h2 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-box p {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.8;
}

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

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 2px solid var(--border-color);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 50px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
  margin-top: 16px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-main);
  position: relative;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), transparent);
  border-radius: 3px;
}

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

.footer-col ul li a {
  color: var(--text-muted);
  font-size: 14px;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-col ul li a:hover {
  color: var(--primary);
  transform: translateX(4px);
}

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 14px;
}

.footer-contact li i {
  color: var(--primary);
  font-size: 14px;
  width: 18px;
  text-align: center;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
  color: var(--text-soft);
  flex-wrap: wrap;
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
  }
  .intro-grid {
    flex-direction: column;
    gap: 36px;
  }
  .intro-media {
    flex: none;
    width: 100%;
  }
  .intro-content {
    flex: none;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }
  .nav-toggle {
    display: flex;
  }
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-deep);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 24px;
    margin: 0;
    gap: 8px;
    border-bottom: 2px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    display: none;
  }
  .main-nav.open {
    display: flex;
  }
  .nav-link {
    padding: 12px 20px;
    text-align: center;
    border-radius: 10px;
  }
  .nav-link.active::before {
    display: none;
  }
  .header-actions .btn-outline {
    display: none;
  }
  .category-hero {
    padding: 70px 0 50px;
  }
  .category-hero h1 {
    font-size: 34px;
  }
  .category-hero .hero-desc {
    font-size: 15px;
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .topics-grid {
    grid-template-columns: 1fr;
  }
  .section-title {
    font-size: 28px;
  }
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .cta-box h2 {
    font-size: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }
  .brand-text {
    font-size: 17px;
  }
  .brand-icon {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }
  .category-hero h1 {
    font-size: 28px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .intro-features {
    grid-template-columns: 1fr;
  }
  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .cta-buttons .btn {
    justify-content: center;
  }
  .hero-tags-row {
    gap: 8px;
  }
  .tag-badge {
    font-size: 12px;
    padding: 5px 12px;
  }
}

/* ===== Utility ===== */
.text-primary {
  color: var(--primary);
}

.text-accent {
  color: var(--accent);
}

.mt-20 {
  margin-top: 20px;
}

.mb-20 {
  margin-bottom: 20px;
}

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

/* roulang page: article */
:root {
      --bg-deep: #080d1a;
      --bg-body: #0c1322;
      --bg-card: #121b30;
      --bg-card-hover: #17203a;
      --bg-elevated: #1a2542;
      --border: rgba(0, 229, 255, 0.12);
      --border-strong: rgba(0, 229, 255, 0.3);
      --primary: #00e5ff;
      --primary-dark: #00b8d4;
      --secondary: #8b5cf6;
      --accent: #ff3d81;
      --text-main: #ecf2ff;
      --text-secondary: #9aaac6;
      --text-muted: #64748b;
      --radius-sm: 10px;
      --radius: 16px;
      --radius-lg: 24px;
      --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.35);
      --shadow-hover: 0 12px 38px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 229, 255, 0.15);
      --glow: 0 0 30px rgba(0, 229, 255, 0.15);
      --transition: .3s cubic-bezier(.4, 0, .2, 1);
      --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

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

    h1, h2, h3, h4, h5, h6 {
      line-height: 1.3;
      color: #f4f8ff;
      margin: 0 0 .55em;
    }

    p {
      margin: 0 0 1em;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition), border-color var(--transition), background var(--transition), transform var(--transition), box-shadow var(--transition);
    }

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

    ul, ol {
      list-style: none;
      margin: 0;
      padding: 0;
    }

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

    input, textarea {
      font-family: inherit;
    }

    a:focus, button:focus, input:focus {
      outline: 2px solid rgba(0, 229, 255, 0.4);
      outline-offset: 2px;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 26px;
      border-radius: 12px;
      font-size: 15px;
      font-weight: 700;
      line-height: 1;
      border: 1px solid transparent;
      cursor: pointer;
      transition: all var(--transition);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #6ef7ff);
      color: #081424;
      box-shadow: 0 6px 22px rgba(0, 229, 255, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 30px rgba(0, 229, 255, 0.45);
    }

    .btn-primary:active {
      transform: translateY(2px);
      box-shadow: 0 2px 10px rgba(0, 229, 255, 0.2);
    }

    .btn-outline {
      background: rgba(0, 229, 255, 0.04);
      border-color: var(--border-strong);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.14);
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .btn-block {
      width: 100%;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
    }

    .badge-primary {
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(139, 92, 246, 0.15));
      color: var(--primary);
      border: 1px solid rgba(0, 229, 255, 0.3);
    }

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

    .section-head.centered {
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .section-eyebrow {
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 2px;
      color: var(--primary);
      text-transform: uppercase;
    }

    .section-title {
      font-size: 30px;
      margin-top: 8px;
      color: #f4f8ff;
    }

    .section-desc {
      color: var(--text-secondary);
      margin-top: 8px;
      max-width: 560px;
    }

    .empty-tip {
      text-align: center;
      color: var(--text-muted);
      padding: 40px 0;
      font-size: 15px;
      background: var(--bg-card);
      border: 1px dashed var(--border-strong);
      border-radius: var(--radius-lg);
    }

    /* ===== 顶部导航 ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(8, 13, 26, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      gap: 16px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 20px;
      color: #ffffff;
      flex-shrink: 0;
    }

    .brand-icon {
      width: 38px;
      height: 38px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 11px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #081424;
      font-size: 17px;
      box-shadow: var(--glow);
    }

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

    .main-nav .nav-link {
      padding: 9px 16px;
      border-radius: 10px;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-secondary);
      transition: var(--transition);
    }

    .main-nav .nav-link:hover {
      color: var(--primary);
      background: rgba(0, 229, 255, 0.08);
    }

    .main-nav .nav-link.active {
      color: #081424;
      background: linear-gradient(135deg, var(--primary), #44d5ff);
      font-weight: 700;
      box-shadow: 0 4px 20px rgba(0, 229, 255, 0.35);
    }

    .header-tools {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .nav-toggle {
      display: none;
      font-size: 20px;
      color: var(--text-main);
      background: rgba(0, 229, 255, 0.08);
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-sm);
      padding: 8px 12px;
      transition: var(--transition);
    }

    .nav-toggle:hover {
      background: rgba(0, 229, 255, 0.18);
    }

    .mobile-menu {
      display: none;
      flex-direction: column;
      gap: 6px;
      padding: 14px 20px 20px;
      background: var(--bg-deep);
      border-top: 1px solid var(--border);
    }

    .mobile-menu.open {
      display: flex;
    }

    .mobile-menu a {
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      color: var(--text-secondary);
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition);
    }

    .mobile-menu a:hover,
    .mobile-menu a.active {
      background: rgba(0, 229, 255, 0.1);
      color: var(--primary);
    }

    /* ===== 文章 Banner ===== */
    .page-banner {
      position: relative;
      min-height: 330px;
      display: flex;
      align-items: center;
      overflow: hidden;
      padding: 110px 0 65px;
    }

    .banner-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
    }

    .banner-overlay {
      position: absolute;
      inset: 0;
      z-index: 1;
      background: linear-gradient(135deg, rgba(8, 13, 26, 0.95), rgba(8, 13, 26, 0.7) 55%, rgba(139, 92, 246, 0.3));
    }

    .banner-content {
      position: relative;
      z-index: 2;
      text-align: center;
      width: 100%;
    }

    .breadcrumb {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text-secondary);
      margin-bottom: 16px;
      flex-wrap: wrap;
    }

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

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

    .breadcrumb i {
      font-size: 10px;
      color: var(--text-muted);
    }

    .banner-content h1 {
      font-size: 40px;
      font-weight: 800;
      color: #ffffff;
      text-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
      margin-bottom: 14px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .banner-meta {
      display: flex;
      justify-content: center;
      gap: 12px;
      flex-wrap: wrap;
    }

    .banner-tag {
      padding: 6px 16px;
      border-radius: 999px;
      background: rgba(0, 229, 255, 0.12);
      border: 1px solid var(--border-strong);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      backdrop-filter: blur(6px);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* ===== 文章主体 ===== */
    .article-main-layout {
      padding: 50px 0 80px;
    }

    .article-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }

    .article-head {
      border-bottom: 1px solid var(--border);
      padding-bottom: 22px;
      margin-bottom: 26px;
    }

    .article-tags {
      margin-bottom: 14px;
    }

    .article-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
      font-size: 14px;
      color: var(--text-muted);
    }

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

    .article-meta i {
      color: var(--primary);
      width: 15px;
    }

    .article-cover {
      border-radius: 14px;
      overflow: hidden;
      margin-bottom: 28px;
      border: 1px solid var(--border);
    }

    .article-cover img {
      width: 100%;
      aspect-ratio: 16 / 7;
      object-fit: cover;
    }

    .article-body {
      font-size: 16px;
      line-height: 1.9;
      color: var(--text-main);
    }

    .article-body h2 {
      font-size: 24px;
      margin-top: 36px;
      margin-bottom: 16px;
      padding-left: 14px;
      border-left: 3px solid var(--primary);
    }

    .article-body h3 {
      font-size: 20px;
      margin-top: 28px;
      margin-bottom: 12px;
    }

    .article-body h4 {
      font-size: 17px;
      margin-top: 22px;
      margin-bottom: 10px;
    }

    .article-body p {
      margin-bottom: 1.4em;
    }

    .article-body ul {
      padding-left: 1.4em;
      list-style: disc;
      margin-bottom: 1.4em;
    }

    .article-body ol {
      padding-left: 1.4em;
      list-style: decimal;
      margin-bottom: 1.4em;
    }

    .article-body li {
      margin-bottom: 6px;
    }

    .article-body blockquote {
      border-left: 3px solid var(--secondary);
      background: rgba(139, 92, 246, 0.08);
      padding: 16px 22px;
      border-radius: 0 12px 12px 0;
      margin: 1.6em 0;
      color: var(--text-secondary);
    }

    .article-body img {
      border-radius: 14px;
      margin: 1.2em 0;
    }

    .article-body a {
      color: var(--primary);
      border-bottom: 1px solid rgba(0, 229, 255, 0.4);
    }

    .article-share {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-top: 34px;
      padding-top: 22px;
      border-top: 1px solid var(--border);
      flex-wrap: wrap;
    }

    .article-share span {
      font-size: 14px;
      color: var(--text-secondary);
      font-weight: 600;
      margin-right: 4px;
    }

    .article-share a {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      background: rgba(0, 229, 255, 0.07);
      border: 1px solid var(--border);
      color: var(--text-secondary);
      transition: var(--transition);
    }

    .article-share a:hover {
      background: rgba(0, 229, 255, 0.15);
      border-color: var(--border-strong);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .not-found-card {
      text-align: center;
      padding: 70px 32px;
    }

    .not-found-icon {
      width: 72px;
      height: 72px;
      margin: 0 auto 22px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 20px;
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.12), rgba(139, 92, 246, 0.12));
      color: var(--primary);
      font-size: 28px;
      border: 1px solid var(--border-strong);
    }

    .not-found-card h2 {
      font-size: 26px;
      margin-bottom: 14px;
    }

    .not-found-card p {
      color: var(--text-secondary);
      max-width: 360px;
      margin: 0 auto 24px;
    }

    /* ===== 侧边栏 ===== */
    .sidebar {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .sidebar-widget {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 26px;
      box-shadow: var(--shadow-card);
    }

    .widget-title {
      font-size: 17px;
      margin-bottom: 18px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      color: #f4f8ff;
    }

    .widget-title::before {
      content: "";
      width: 4px;
      height: 18px;
      border-radius: 4px;
      background: linear-gradient(180deg, var(--primary), var(--secondary));
      flex-shrink: 0;
    }

    .about-widget {
      padding: 0;
      overflow: hidden;
    }

    .about-img {
      width: 100%;
      height: 140px;
      object-fit: cover;
    }

    .about-body {
      padding: 24px;
    }

    .about-body h4 {
      font-size: 20px;
      margin-bottom: 10px;
    }

    .about-body p {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .channel-list li {
      margin-bottom: 6px;
    }

    .channel-list li:last-child {
      margin-bottom: 0;
    }

    .channel-list a {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px;
      border-radius: 12px;
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid transparent;
      transition: var(--transition);
    }

    .channel-list a:hover {
      background: rgba(0, 229, 255, 0.07);
      border-color: var(--border-strong);
      transform: translateX(3px);
    }

    .channel-list i:first-child {
      width: 34px;
      height: 34px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(139, 92, 246, 0.15));
      color: var(--primary);
      flex-shrink: 0;
    }

    .channel-list span {
      flex: 1;
      font-weight: 700;
      font-size: 14px;
    }

    .channel-list small {
      font-size: 12px;
      color: var(--text-muted);
      margin-left: 6px;
      white-space: nowrap;
    }

    .channel-list i.fa-arrow-right {
      color: var(--text-muted);
      font-size: 13px;
      transition: var(--transition);
    }

    .channel-list a:hover i.fa-arrow-right {
      color: var(--primary);
      transform: translateX(3px);
    }

    .tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .tag {
      padding: 7px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      background: rgba(139, 92, 246, 0.08);
      border: 1px solid rgba(139, 92, 246, 0.2);
      color: var(--text-secondary);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }

    .tag:hover {
      background: rgba(0, 229, 255, 0.12);
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-1px);
    }

    /* ===== 相关文章 ===== */
    .related-section {
      padding: 70px 0;
      background: linear-gradient(180deg, transparent, rgba(8, 13, 26, 0.6));
    }

    .post-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }

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

    .post-card-thumb {
      position: relative;
      display: block;
      overflow: hidden;
    }

    .post-card-thumb img {
      width: 100%;
      height: 120px;
      object-fit: cover;
      transition: transform .5s ease;
    }

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

    .post-card-badge {
      position: absolute;
      top: 14px;
      left: 14px;
      padding: 5px 12px;
      border-radius: 999px;
      background: rgba(8, 13, 26, 0.85);
      color: var(--primary);
      font-size: 12px;
      font-weight: 700;
      backdrop-filter: blur(4px);
      border: 1px solid var(--border-strong);
    }

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

    .post-card-body h3 {
      font-size: 17px;
      line-height: 1.5;
      margin-bottom: 8px;
    }

    .post-card-body h3 a {
      color: var(--text-main);
    }

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

    .post-card-body p {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.65;
      flex: 1;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .post-card-meta {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 14px;
      gap: 10px;
      flex-wrap: wrap;
    }

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

    .post-card-meta i {
      color: var(--primary);
      font-size: 12px;
    }

    .post-card-meta span:last-child {
      color: var(--primary);
      font-weight: 600;
    }

    /* ===== FAQ ===== */
    .faq-section {
      padding: 70px 0;
    }

    .faq-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      transition: border-color var(--transition), box-shadow var(--transition);
      margin-bottom: 0;
    }

    .faq-card:hover {
      border-color: var(--border-strong);
    }

    .faq-card.open {
      border-color: var(--border-strong);
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding: 20px 22px;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      text-align: left;
      transition: var(--transition);
    }

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

    .faq-question i {
      color: var(--primary);
      transition: transform .3s ease;
      flex-shrink: 0;
    }

    .faq-card.open .faq-question i {
      transform: rotate(180deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height .4s ease;
    }

    .faq-card.open .faq-answer {
      max-height: 320px;
    }

    .faq-answer p {
      padding: 0 22px 20px;
      color: var(--text-secondary);
      font-size: 14px;
      line-height: 1.7;
      margin: 0;
    }

    /* ===== CTA ===== */
    .cta-section {
      padding: 60px 0 80px;
    }

    .cta-box {
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(139, 92, 246, 0.14), rgba(255, 61, 129, 0.05)), var(--bg-card);
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-lg);
      padding: 48px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
      flex-wrap: wrap;
    }

    .cta-box h2 {
      font-size: 26px;
      margin-bottom: 8px;
    }

    .cta-box p {
      color: var(--text-secondary);
      margin-bottom: 0;
    }

    .cta-actions {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    /* ===== 页脚 ===== */
    .site-footer {
      background: var(--bg-deep);
      border-top: 1px solid var(--border);
      padding: 60px 0 0;
      color: var(--text-secondary);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.4fr;
      gap: 40px;
      padding-bottom: 40px;
    }

    .footer-brand .brand {
      margin-bottom: 14px;
      display: inline-flex;
    }

    .footer-brand p {
      font-size: 14px;
      line-height: 1.7;
      color: var(--text-muted);
      margin-top: 14px;
      max-width: 360px;
    }

    .footer-col h4 {
      font-size: 15px;
      color: #ffffff;
      margin-bottom: 18px;
      font-weight: 800;
    }

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

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

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

    .footer-contact li {
      color: var(--text-muted);
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .footer-contact li i {
      color: var(--primary);
      width: 16px;
      flex-shrink: 0;
    }

    .footer-bottom {
      border-top: 1px solid var(--border);
      padding: 22px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--text-muted);
      gap: 12px;
      flex-wrap: wrap;
    }

    .footer-bottom p {
      margin: 0;
    }

    .footer-bottom span {
      color: var(--primary);
      font-weight: 600;
    }

    /* ===== 响应式断点 ===== */
    @media screen and (max-width: 1023px) {
      .article-grid {
        row-gap: 40px;
      }

      .article-sidebar-col {
        margin-top: 10px;
      }

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

      .cta-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media screen and (max-width: 767px) {
      .main-nav {
        display: none;
      }

      .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
      }

      .header-inner {
        height: 64px;
      }

      .brand-text {
        font-size: 18px;
      }

      .page-banner {
        min-height: 260px;
        padding: 90px 0 45px;
      }

      .banner-content h1 {
        font-size: 26px;
        line-height: 1.35;
      }

      .banner-meta {
        gap: 8px;
      }

      .article-main-layout {
        padding: 36px 0 60px;
      }

      .article-card {
        padding: 22px 18px;
        border-radius: 18px;
      }

      .article-meta {
        gap: 14px;
        font-size: 13px;
      }

      .article-cover img {
        aspect-ratio: 16 / 9;
      }

      .article-body {
        font-size: 15px;
        line-height: 1.85;
      }

      .article-body h2 {
        font-size: 20px;
        margin-top: 28px;
      }

      .section-title {
        font-size: 24px;
      }

      .related-section {
        padding: 50px 0;
      }

      .faq-section {
        padding: 50px 0;
      }

      .cta-section {
        padding: 40px 0 60px;
      }

      .cta-box {
        padding: 32px 24px;
      }

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

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

    @media screen and (max-width: 520px) {
      .container {
        padding: 0 16px;
      }

      .section-head {
        flex-direction: column;
        align-items: flex-start;
      }

      .btn {
        width: 100%;
      }

      .cta-actions {
        width: 100%;
      }

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

      .banner-content h1 {
        font-size: 22px;
      }

      .banner-tag {
        font-size: 12px;
        padding: 5px 12px;
      }

      .article-card {
        padding: 18px 14px;
      }

      .article-share {
        justify-content: center;
      }

      .post-card-body h3 {
        font-size: 16px;
      }
    }

/* roulang page: category2 */
:root {
  --bg-dark: #080d1f;
  --bg-body: #0d1526;
  --bg-card: #131c36;
  --bg-deep: #0a1122;
  --neur: #00e5a0;
  --neon-gold: #ffc857;
  --neon-blue: #38bdf8;
  --text-light: #eaf0ff;
  --text-body: #b4c0d8;
  --text-muted: #74809c;
  --border-light: rgba(255,255,255,0.08);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-lg: 0 24px 60px rgba(0,0,0,0.45);
  --shadow-md: 0 12px 32px rgba(0,0,0,0.30);
  --shadow-neon: 0 0 22px rgba(0,229,160,0.25);
  --space-section: 6rem;
  --transition: all 0.3s ease;
}
*,*::before,*::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-body);
  color: var(--text-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
.container { width: 100%; max-width: 1210px; margin: 0 auto; padding: 0 24px; }
.section { padding: var(--space-section) 0; position: relative; }
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.85rem; font-weight: 600; letter-spacing: 0.14em;
  color: var(--neur); background: rgba(0,229,160,0.1);
  border: 1px solid rgba(0,229,160,0.25);
  padding: 6px 16px; border-radius: 999px; margin-bottom: 16px;
}
.section-label i { font-size: 0.75rem; }
.section-title {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  color: var(--text-light); font-weight: 800; line-height: 1.25;
  margin: 0 0 16px;
}
.section-sub {
  font-size: 1.02rem; color: var(--text-muted);
  max-width: 680px; margin: 0 0 40px;
}
.text-center { text-align: center; }
.text-center .section-sub { margin-left: auto; margin-right: auto; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8,13,31,0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 8px 30px rgba(0,0,0,0.28);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 72px; gap: 20px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  flex-shrink: 0;
}
.brand-icon {
  width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--neur), #00b386);
  color: #071019; font-size: 1rem; border-radius: 10px;
  box-shadow: var(--shadow-neon);
}
.brand-text { font-size: 1.2rem; font-weight: 800; color: var(--text-light); letter-spacing: 0.02em; }
.brand-text .dot { color: var(--neur); }
.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  position: relative; display: inline-block;
  padding: 8px 16px; font-size: 0.95rem; font-weight: 600;
  color: var(--text-body); border-radius: var(--radius-sm);
}
.nav-link:hover { color: var(--text-light); background: rgba(255,255,255,0.04); }
.nav-link.active { color: var(--neur); }
.nav-link.active::after {
  content: ''; position: absolute; left: 14px; right: 14px; bottom: 2px;
  height: 2px; background: var(--neur); border-radius: 2px;
  box-shadow: 0 0 10px rgba(0,229,160,0.7);
}
.header-actions { display: flex; align-items: center; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 24px; border-radius: 999px; border: none;
  font-size: 0.92rem; font-weight: 700; line-height: 1.2;
  transition: var(--transition); text-decoration: none;
}
.btn-neon {
  background: linear-gradient(135deg, #00e5a0, #00b386);
  color: #071019; box-shadow: 0 6px 20px rgba(0,229,160,0.25);
}
.btn-neon:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(0,229,160,0.35); color: #071019; }
.btn-outline {
  background: transparent; color: var(--text-light);
  border: 1px solid rgba(255,255,255,0.2);
}
.btn-outline:hover { border-color: var(--neur); color: var(--neur); box-shadow: var(--shadow-neon); }
.btn-gold {
  background: linear-gradient(135deg, var(--neon-gold), #f5a623);
  color: #241a00;
}
.btn-gold:hover { transform: translateY(-2px); color: #241a00; box-shadow: 0 10px 28px rgba(255,200,87,0.3); }
.btn-lg { padding: 15px 34px; font-size: 1rem; }
.nav-toggle {
  display: none; width: 42px; height: 42px;
  align-items: center; justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px; color: var(--text-light); font-size: 1.05rem;
}
.nav-toggle:focus { outline: 2px solid var(--neur); outline-offset: 2px; }

/* ===== Hero ===== */
.channel-hero {
  position: relative; padding: 110px 0;
  background-image: linear-gradient(rgba(8,13,31,0.82), rgba(8,13,31,0.94)), url('/assets/images/backpic/back-2.png');
  background-size: cover; background-position: center;
  border-bottom: 1px solid var(--border-light);
  overflow: hidden;
}
.channel-hero::before {
  content: ''; position: absolute; top: -120px; right: -80px;
  width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,229,160,0.20), transparent 70%);
  pointer-events: none;
}
.channel-hero-inner { position: relative; z-index: 2; max-width: 760px; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.82rem; font-weight: 700; letter-spacing: 0.16em;
  color: var(--neon-gold); text-transform: uppercase;
  background: rgba(255,200,87,0.1); border: 1px solid rgba(255,200,87,0.3);
  padding: 6px 16px; border-radius: 999px; margin-bottom: 20px;
}
.channel-hero h1 {
  font-size: clamp(2.3rem, 5vw, 3.4rem); font-weight: 900;
  color: var(--text-light); line-height: 1.18; margin: 0 0 18px;
}
.channel-hero h1 span { color: var(--neur); }
.channel-hero p { font-size: 1.08rem; color: var(--text-body); margin: 0 0 32px; max-width: 640px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-badges {
  display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.05); border: 1px solid var(--border-light);
  border-radius: 999px; padding: 8px 18px; font-size: 0.85rem; color: var(--text-body);
}
.hero-badge i { color: var(--neur); }
.hero-badge strong { color: var(--text-light); }

/* ===== Feature Section ===== */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 34px 28px;
  transition: var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; left: 0; top: 0; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--neur), transparent); opacity: 0.6;
}
.feature-card:hover { transform: translateY(-6px); border-color: rgba(0,229,160,0.3); box-shadow: var(--shadow-md); }
.feature-icon {
  width: 56px; height: 56px; display: flex; align-items: center; justify-content: center;
  border-radius: 16px; font-size: 1.3rem; margin-bottom: 20px;
}
.feature-icon.green { background: rgba(0,229,160,0.12); color: var(--neur); }
.feature-icon.blue { background: rgba(56,189,248,0.12); color: var(--neon-blue); }
.feature-icon.gold { background: rgba(255,200,87,0.12); color: var(--neon-gold); }
.feature-card h3 { color: var(--text-light); font-size: 1.1rem; font-weight: 700; margin: 0 0 10px; }
.feature-card p { font-size: 0.92rem; color: var(--text-muted); margin: 0; }

/* ===== Category Cards ===== */
.sport-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sport-card {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: var(--transition); position: relative;
}
.sport-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: rgba(0,229,160,0.3); }
.sport-card .cover-wrap { position: relative; aspect-ratio: 4/3; overflow: hidden; }
.sport-card .cover-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.sport-card:hover .cover-wrap img { transform: scale(1.06); }
.sport-card .cover-mask {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(8,13,31,0.85), transparent 60%);
}
.sport-card .cover-tag {
  position: absolute; top: 14px; left: 14px;
  background: rgba(8,13,31,0.75); backdrop-filter: blur(6px);
  color: var(--neur); font-size: 0.75rem; font-weight: 700;
  padding: 4px 12px; border-radius: 999px; border: 1px solid rgba(0,229,160,0.3);
}
.sport-card .sport-info { padding: 20px; }
.sport-card .sport-info h3 { font-size: 1.15rem; font-weight: 700; color: var(--text-light); margin: 0 0 8px; }
.sport-card .sport-info p { font-size: 0.88rem; color: var(--text-muted); margin: 0 0 16px; line-height: 1.6; }
.sport-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.85rem; font-weight: 700; color: var(--neur);
}
.sport-link i { transition: transform 0.2s ease; font-size: 0.8rem; }
.sport-card:hover .sport-link i { transform: translateX(4px); }

/* ===== Schedule ===== */
.schedule-wrap {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); overflow: hidden;
}
.schedule-list { margin: 0; padding: 0; }
.schedule-item {
  display: flex; align-items: center; gap: 20px;
  padding: 24px; border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}
.schedule-item:last-child { border-bottom: none; }
.schedule-item:hover { background: rgba(255,255,255,0.03); }
.schedule-date {
  min-width: 64px; text-align: center;
  background: rgba(0,229,160,0.08); border: 1px solid rgba(0,229,160,0.2);
  border-radius: 12px; padding: 8px 6px;
}
.schedule-date .day { display: block; font-size: 1.4rem; font-weight: 800; color: var(--neur); line-height: 1.1; }
.schedule-date .month { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; }
.schedule-info { flex: 1; }
.schedule-info .tag { display: inline-block; font-size: 0.72rem; font-weight: 700; color: var(--neon-gold); background: rgba(255,200,87,0.1); border-radius: 999px; padding: 2px 10px; margin-bottom: 5px; }
.schedule-info h3 { font-size: 1.02rem; font-weight: 700; color: var(--text-light); margin: 0 0 4px; }
.schedule-info p { font-size: 0.84rem; color: var(--text-muted); margin: 0; }
.schedule-status {
  font-size: 0.82rem; font-weight: 700;
  padding: 6px 16px; border-radius: 999px; white-space: nowrap;
}
.schedule-status.live { color: #ff6b6b; background: rgba(255,107,107,0.12); }
.schedule-status.upcoming { color: var(--neur); background: rgba(0,229,160,0.1); }
.schedule-status.finished { color: var(--text-muted); background: rgba(255,255,255,0.05); }
.schedule-more { text-align: center; padding: 24px; }

/* ===== Stats ===== */
.stats-wrap {
  background: linear-gradient(135deg, rgba(0,229,160,0.05), rgba(56,189,248,0.05)), var(--bg-deep);
  border: 1px solid var(--border-light); border-radius: var(--radius-lg);
  padding: 48px 24px; display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}
.stat-block { text-align: center; position: relative; }
.stat-block + .stat-block::before {
  content: ''; position: absolute; left: 0; top: 10%; height: 80%; width: 1px;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.15), transparent);
}
.stat-num {
  font-size: clamp(2rem, 3.6vw, 2.9rem); font-weight: 900;
  color: var(--text-light); line-height: 1.2;
}
.stat-num em { font-style: normal; color: var(--neur); }
.stat-label { font-size: 0.92rem; color: var(--text-muted); margin-top: 6px; }
.stat-block i { font-size: 1.4rem; color: var(--neon-gold); margin-bottom: 8px; }

/* ===== Steps ===== */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.step-card {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 32px 24px; position: relative;
  transition: var(--transition);
}
.step-card:hover { transform: translateY(-5px); border-color: rgba(0,229,160,0.3); box-shadow: var(--shadow-md); }
.step-num {
  width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  background: rgba(0,229,160,0.12); color: var(--neur);
  border-radius: 50%; font-weight: 800; font-size: 1.2rem;
  margin-bottom: 18px; border: 1px dashed rgba(0,229,160,0.4);
}
.step-card h3 { color: var(--text-light); font-size: 1.02rem; font-weight: 700; margin: 0 0 10px; }
.step-card p { font-size: 0.88rem; color: var(--text-muted); margin: 0; }

/* ===== FAQ ===== */
.faq-wrap { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-md); margin-bottom: 14px; overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(0,229,160,0.3); box-shadow: var(--shadow-neon); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 24px; background: none; border: none; text-align: left;
  font-size: 1rem; font-weight: 600; color: var(--text-light);
  transition: var(--transition);
}
.faq-question:hover { background: rgba(255,255,255,0.02); }
.faq-question i { color: var(--neur); transition: transform 0.3s ease; font-size: 0.9rem; }
.faq-item.open .faq-question i { transform: rotate(180deg); }
.faq-answer { display: none; padding: 0 24px 22px; font-size: 0.92rem; color: var(--text-muted); line-height: 1.8; }
.faq-item.open .faq-answer { display: block; }

/* ===== CTA ===== */
.cta-section {
  position: relative; padding: 90px 0; text-align: center;
  background-image: linear-gradient(rgba(8,13,31,0.9), rgba(8,13,31,0.95)), url('/assets/images/backpic/back-1.png');
  background-size: cover; background-position: center;
  border-top: 1px solid var(--border-light); border-bottom: 1px solid var(--border-light);
}
.cta-section h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); color: var(--text-light); font-weight: 900; margin: 0 0 16px; }
.cta-section p { font-size: 1.05rem; color: var(--text-body); max-width: 600px; margin: 0 auto 32px; }
.cta-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 16px; }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-dark); border-top: 1px solid var(--border-light);
  padding: 70px 0 0; margin-top: 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px;
  padding-bottom: 46px;
}
.footer-brand p { font-size: 0.92rem; color: var(--text-muted); margin-top: 16px; line-height: 1.7; }
.footer-col h4 {
  font-size: 0.96rem; font-weight: 700; color: var(--text-light);
  margin: 0 0 18px; position: relative; padding-bottom: 10px;
}
.footer-col h4::after {
  content: ''; position: absolute; left: 0; bottom: 0; width: 26px; height: 2px;
  background: var(--neur); border-radius: 2px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: var(--text-muted); font-size: 0.9rem; }
.footer-col ul li a:hover { color: var(--neur); padding-left: 4px; }
.footer-contact li { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; }
.footer-contact i { color: var(--neur); width: 20px; margin-right: 6px; }
.footer-bottom {
  border-top: 1px solid var(--border-light); padding: 22px 0;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
}
.footer-bottom p { font-size: 0.85rem; color: var(--text-muted); margin: 0; }
.footer-bottom span { font-size: 0.82rem; color: var(--text-muted); }

/* ===== Reveal animation ===== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media screen and (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .sport-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media screen and (max-width: 768px) {
  :root { --space-section: 4rem; }
  .nav-toggle { display: inline-flex; }
  .main-nav {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: rgba(8,13,31,0.98); backdrop-filter: blur(20px);
    flex-direction: column; align-items: flex-start; gap: 6px;
    padding: 20px 24px; border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
  }
  .main-nav.open { display: flex; }
  .nav-link { width: 100%; padding: 12px 12px; font-size: 1rem; }
  .nav-link.active::after { display: none; }
  .nav-link.active { background: rgba(0,229,160,0.08); border-radius: 10px; }
  .header-actions .btn-neon { display: none; }
  .channel-hero { padding: 80px 0; }
  .channel-hero h1 { font-size: 2rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .stats-wrap { grid-template-columns: 1fr 1fr; padding: 36px 20px; }
  .stat-block + .stat-block::before { display: none; }
  .steps-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .schedule-item { flex-wrap: wrap; gap: 12px; }
  .schedule-status { margin-left: auto; }
}
@media screen and (max-width: 520px) {
  .container { padding: 0 18px; }
  .sport-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .stats-wrap { grid-template-columns: 1fr; gap: 26px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .schedule-date { min-width: 56px; }
}

/* roulang page: category3 */
:root {
  --bg-dark: #080c14;
  --bg-deep: #0b111e;
  --bg-card: #111a2c;
  --bg-card-hover: #16223a;
  --bg-soft: #1a2740;
  --neon-primary: #00e5ff;
  --neon-secondary: #ff2d75;
  --neon-accent: #ffb72d;
  --text-main: #eef2f9;
  --text-muted: #91a0b5;
  --text-weak: #5e6d82;
  --border: rgba(255, 255, 255, 0.07);
  --border-neon: rgba(0, 229, 255, 0.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.55);
  --shadow-neon: 0 4px 24px rgba(0, 229, 255, 0.18);
  --spacing-section: 92px;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--neon-primary); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: #7cf1ff; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button, input { font-family: inherit; }

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ===== Header & Nav ===== */
.site-header {
  background: rgba(8, 12, 20, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--neon-primary), var(--neon-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #0a0e17;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}
.brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-main);
  background: linear-gradient(90deg, var(--neon-primary), var(--neon-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.3s ease;
  border: 1px solid transparent;
}
.nav-link:hover {
  color: var(--neon-primary);
  background: rgba(0, 229, 255, 0.06);
  border-color: rgba(0, 229, 255, 0.2);
}
.nav-link.active {
  color: var(--neon-primary);
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--border-neon);
  box-shadow: 0 0 14px rgba(0, 229, 255, 0.15);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 3px;
  border-radius: 4px;
  background: var(--neon-primary);
  box-shadow: 0 0 10px var(--neon-primary);
}
.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
}
.btn:focus-visible { outline: 3px solid rgba(0, 229, 255, 0.5); outline-offset: 3px; }
.btn-primary {
  background: linear-gradient(135deg, var(--neon-primary), var(--neon-secondary));
  color: #0a0e17;
  border: none;
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0, 229, 255, 0.35);
  color: #0a0e17;
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--neon-primary);
  border: 1px solid var(--border-neon);
}
.btn-secondary:hover {
  background: rgba(0, 229, 255, 0.1);
  transform: translateY(-3px);
  box-shadow: var(--shadow-neon);
  color: var(--neon-primary);
}
.btn-light {
  background: var(--text-main);
  color: var(--bg-dark);
  border: none;
}
.btn-light:hover { background: #fff; transform: translateY(-3px); box-shadow: 0 8px 24px rgba(255,255,255,0.15); color: var(--bg-dark); }
.btn-mobile { display: none; }

/* ===== Hero / Page Banner ===== */
.page-hero {
  position: relative;
  padding: 110px 0 90px;
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(8, 12, 20, 0.92) 0%, rgba(10, 18, 34, 0.78) 50%, rgba(8, 12, 20, 0.55) 100%);
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0; right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--bg-dark), transparent);
}
.hero-inner { position: relative; z-index: 2; max-width: 820px; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--neon-primary); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb i { font-size: 12px; color: var(--text-weak); }
.page-hero h1 {
  font-size: 48px;
  line-height: 1.2;
  font-weight: 900;
  margin-bottom: 18px;
  background: linear-gradient(90deg, var(--text-main) 20%, var(--neon-primary) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-badges { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 40px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  backdrop-filter: blur(8px);
}
.hero-badge i { color: var(--neon-primary); }

/* ===== Section base ===== */
.section { padding: var(--spacing-section) 0; }
.section-alt { background: var(--bg-deep); }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--neon-primary);
  margin-bottom: 12px;
}
.section-label i { font-size: 15px; }
.section-title {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin: 0 0 10px 0;
}
.section-desc { color: var(--text-muted); max-width: 560px; font-size: 15px; line-height: 1.8; }
.link-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(0, 229, 255, 0.06);
  border: 1px solid var(--border-neon);
  border-radius: 40px;
  color: var(--neon-primary);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  white-space: nowrap;
}
.link-more:hover { background: rgba(0, 229, 255, 0.14); transform: translateX(4px); color: var(--neon-primary); }

/* ===== Filter Tabs ===== */
.channel-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}
.tab-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}
.tab-pill:hover { color: var(--neon-primary); border-color: var(--border-neon); transform: translateY(-2px); }
.tab-pill.active {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(255, 45, 117, 0.12));
  border-color: var(--neon-primary);
  color: var(--neon-primary);
  box-shadow: var(--shadow-neon);
}

/* ===== Guide Cards Grid ===== */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.guide-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  display: flex;
  flex-direction: column;
}
.guide-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-neon);
  box-shadow: var(--shadow-lg), var(--shadow-neon);
  background: var(--bg-card-hover);
}
.guide-card-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.guide-card-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.guide-card:hover .guide-card-cover img { transform: scale(1.06); }
.guide-card-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--bg-card) 0%, transparent 45%);
}
.guide-card-cat {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 6px 14px;
  background: rgba(8, 12, 20, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 30px;
  font-size: 12px;
  font-weight: 700;
  color: var(--neon-primary);
  letter-spacing: 0.5px;
}
.guide-card-body { padding: 24px 24px 26px; flex: 1; display: flex; flex-direction: column; }
.guide-card-hd { font-size: 19px; font-weight: 800; line-height: 1.45; color: var(--text-main); margin-bottom: 12px; }
.guide-card-hd a { color: var(--text-main); transition: color 0.3s; }
.guide-card-hd a:hover { color: var(--neon-primary); }
.guide-card-excerpt { font-size: 14px; color: var(--text-muted); line-height: 1.75; flex: 1; margin-bottom: 18px; }
.guide-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-weak);
}
.guide-meta-left { display: flex; align-items: center; gap: 14px; }
.guide-meta-left span { display: inline-flex; align-items: center; gap: 5px; }
.guide-meta-left i { color: var(--neon-primary); font-size: 12px; }

/* ===== Feature Split ===== */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.feature-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}
.feature-media img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.feature-media::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), transparent 40%);
  z-index: 1;
}
.feature-media-tag {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 2;
  padding: 8px 18px;
  background: rgba(0, 229, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid var(--neon-primary);
  border-radius: 30px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}
.feature-body h2 { font-size: 30px; font-weight: 800; line-height: 1.4; margin-bottom: 18px; color: var(--text-main); }
.feature-body h2 em { font-style: normal; color: var(--neon-primary); }
.feature-body p { color: var(--text-muted); font-size: 15px; line-height: 1.9; margin-bottom: 20px; }
.feature-list { margin-top: 10px; display: flex; flex-direction: column; gap: 12px; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-main);
  font-size: 15px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.3s ease;
}
.feature-list li:hover { border-color: var(--border-neon); background: var(--bg-card-hover); transform: translateX(4px); }
.feature-list i { color: var(--neon-primary); margin-top: 4px; font-size: 15px; }

/* ===== Stats Block ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin: 48px 0 0;
}
.stat-card {
  background: linear-gradient(145deg, var(--bg-card), var(--bg-card-hover));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 24px;
  text-align: center;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: var(--neon-primary);
  box-shadow: 0 0 16px var(--neon-primary);
}
.stat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md), var(--shadow-neon); }
.stat-num {
  font-size: 40px;
  font-weight: 900;
  background: linear-gradient(120deg, var(--neon-primary), var(--neon-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 8px;
}
.stat-label { font-size: 14px; color: var(--text-muted); font-weight: 600; }

/* ===== Approach Steps ===== */
.steps-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.step-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all 0.4s ease;
}
.step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(255, 45, 117, 0.3); }
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(255, 45, 117, 0.12));
  border: 1px solid rgba(0, 229, 255, 0.25);
  color: var(--neon-primary);
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 18px;
}
.step-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.step-card p { font-size: 14px; color: var(--text-muted); line-height: 1.75; }
.step-arrow {
  position: absolute;
  top: 44px;
  right: -22px;
  color: var(--neon-primary);
  font-size: 18px;
  z-index: 2;
  opacity: 0.7;
}

/* ===== FAQ ===== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s ease;
}
.faq-item:hover { border-color: var(--border-neon); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: all 0.3s ease;
}
.faq-q i {
  color: var(--neon-primary);
  transition: transform 0.4s ease;
  flex-shrink: 0;
}
.faq-item.open .faq-q i { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
  transition: all 0.45s cubic-bezier(0.4, 0, 0.2, 1);
  border-top: 0 solid transparent;
}
.faq-item.open .faq-a {
  max-height: 240px;
  padding: 0 24px 20px;
  border-top-width: 1px;
  border-top-color: var(--border);
}

/* ===== CTA ===== */
.cta-block {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: 60px 48px;
  background-image: url('/assets/images/backpic/back-3.png');
  background-size: cover;
  background-position: center;
  text-align: center;
}
.cta-block::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(8, 12, 20, 0.92), rgba(0, 229, 255, 0.12));
  backdrop-filter: blur(4px);
}
.cta-content { position: relative; z-index: 2; }
.cta-content h2 { font-size: 32px; font-weight: 800; margin-bottom: 14px; color: #fff; }
.cta-content p { font-size: 16px; color: rgba(255, 255, 255, 0.8); margin-bottom: 30px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-btns { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ===== Footer ===== */
.site-footer {
  background: #060a12;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
  position: relative;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon-primary), var(--neon-secondary), transparent);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand p { font-size: 14px; color: var(--text-muted); line-height: 1.9; margin-top: 16px; }
.footer-col h4 {
  font-size: 15px;
  color: var(--text-main);
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 1px;
  position: relative;
  padding-bottom: 12px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--neon-primary);
  border-radius: 4px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  color: var(--text-muted);
  font-size: 14px;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.footer-col ul a:hover { color: var(--neon-primary); transform: translateX(4px); }
.footer-col ul a::before { content: '›'; color: var(--neon-primary); opacity: 0; transform: translateX(-6px); transition: all 0.3s ease; }
.footer-col ul a:hover::before { opacity: 1; transform: translateX(0); }
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 12px;
}
.footer-contact i { color: var(--neon-primary); width: 16px; text-align: center; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-weak);
}
.footer-bottom a { color: var(--text-weak); transition: color 0.3s; }
.footer-bottom a:hover { color: var(--neon-primary); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .guide-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .steps-wrap { grid-template-columns: repeat(2, 1fr); }
  .feature-split { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .page-hero h1 { font-size: 38px; }
  .section-title { font-size: 28px; }
}
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { --spacing-section: 64px; }
  .header-inner { flex-wrap: wrap; gap: 12px; padding: 12px 0; }
  .main-nav { order: 3; width: 100%; justify-content: center; flex-wrap: wrap; }
  .nav-link { padding: 8px 14px; font-size: 14px; }
  .header-cta .btn { display: none; }
  .btn-mobile { display: inline-flex; }
  .page-hero { padding: 80px 0 64px; }
  .page-hero h1 { font-size: 32px; }
  .hero-desc { font-size: 15px; }
  .section-title { font-size: 24px; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 16px; }
  .guide-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; gap: 16px; }
  .steps-wrap { grid-template-columns: 1fr; }
  .step-arrow { display: none; }
  .cta-block { padding: 44px 24px; }
  .cta-content h2 { font-size: 26px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .feature-body h2 { font-size: 24px; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .brand-text { font-size: 17px; }
  .brand-icon { width: 36px; height: 36px; font-size: 15px; }
  .main-nav { gap: 4px; }
  .nav-link { padding: 7px 10px; font-size: 13px; }
  .guide-card-hd { font-size: 17px; }
  .stats-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-badge { font-size: 13px; padding: 6px 14px; }
  .section-title { font-size: 22px; }
  .tab-pill { padding: 8px 16px; font-size: 13px; }
}