/* roulang page: index */
:root {
  --bg-base: #070B14;
  --bg-raised: #0E1526;
  --glass-bg: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.08);
  --glass-bg-hover: rgba(255,255,255,0.07);
  --accent: #22D3EE;
  --accent-hover: #67E8F9;
  --accent-glow: rgba(34,211,238,0.25);
  --warm-accent: #F59E0B;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.3);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { background: none; border: none; cursor: pointer; color: inherit; font: inherit; }
.container-x {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 32px;
  padding-right: 32px;
}
.section {
  padding-top: 96px;
  padding-bottom: 96px;
  position: relative;
}
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-glass);
  transition: transform 150ms ease-out, box-shadow 150ms ease-out, background 150ms ease-out;
}
.glass-card:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #070B14;
  font-weight: 600;
  border-radius: 9999px;
  padding: 12px 28px;
  font-size: 15px;
  transition: all 150ms ease-out;
  box-shadow: 0 0 20px rgba(34,211,238,0.15);
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 30px rgba(34,211,238,0.3);
  transform: translateY(-1px);
}
.btn-primary:active { transform: scale(0.98); }
.btn-glass {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 9999px;
  padding: 12px 28px;
  font-size: 15px;
  transition: all 150ms ease-out;
}
.btn-glass:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.22);
  transform: translateY(-1px);
}
.btn-glass:active { transform: scale(0.98); }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-lg { padding: 14px 36px; font-size: 16px; }

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 80px;
  transition: all 200ms ease;
  background: transparent;
}
.site-header.scrolled {
  background: rgba(7,11,20,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  height: 64px;
}
.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #0891B2);
  display: flex; align-items: center; justify-content: center;
  color: #070B14;
  font-size: 16px;
}
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: color 150ms ease, background 150ms ease;
  position: relative;
  white-space: nowrap;
}
.nav-link:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-link.active { color: var(--text-primary); }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 14px; right: 14px;
  bottom: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 10px rgba(34,211,238,0.5);
}

/* Mobile top bar */
.mobile-topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: rgba(7,11,20,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 1000;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}
.hamburger {
  width: 40px; height: 40px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  color: var(--text-primary);
  transition: background 150ms ease;
}
.hamburger:hover { background: rgba(255,255,255,0.08); }

/* Drawer */
.drawer {
  position: fixed;
  top: 56px; left: 0; right: 0; bottom: 0;
  background: rgba(7,11,20,0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 999;
  padding: 32px 24px 120px;
  display: none;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}
.drawer.open { display: flex; }
.drawer a {
  padding: 14px 12px;
  font-size: 18px;
  color: var(--text-primary);
  border-radius: 10px;
  transition: background 150ms ease;
}
.drawer a:hover { background: rgba(255,255,255,0.06); }
.drawer a.active { color: var(--accent); }

/* Mobile tab nav */
.mobile-tab-nav {
  display: none;
  position: fixed;
  bottom: 16px;
  left: 20px;
  right: 20px;
  height: 56px;
  background: rgba(7,11,20,0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 9999px;
  z-index: 1000;
  align-items: center;
  justify-content: space-around;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: var(--text-secondary);
  font-size: 10px;
  padding: 6px 12px;
  border-radius: 9999px;
  transition: color 150ms ease;
}
.tab-item i { font-size: 16px; }
.tab-item.active { color: var(--accent); }
.tab-item:hover { color: var(--text-primary); }

/* Floating CTA */
.floating-cta {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  background: var(--accent);
  color: #070B14;
  font-weight: 600;
  border-radius: 9999px;
  padding: 12px 24px;
  display: none;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 24px rgba(34,211,238,0.3);
  transition: all 150ms ease-out;
  font-size: 14px;
}
.floating-cta:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 32px rgba(34,211,238,0.45);
  transform: translateY(-2px);
}
.floating-cta.visible { display: inline-flex; }

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 120px;
  padding-bottom: 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7,11,20,0.55) 0%, rgba(7,11,20,0.84) 100%);
}
.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 30% 50%, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 30% 50%, black 0%, transparent 70%);
}
.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 64px;
  align-items: center;
}
.hero-left { max-width: 640px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid rgba(34,211,238,0.3);
  background: rgba(34,211,238,0.08);
  border-radius: 9999px;
  font-size: 13px;
  color: var(--accent-hover);
  margin-bottom: 24px;
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(34,211,238,0.8);
}
.hero h1 {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.6;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.hero-metrics {
  display: flex;
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.metric-num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  line-height: 1.2;
}
.metric-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}
.hero-float-card {
  border-radius: 20px;
  padding: 24px;
  transform: rotate(1.5deg);
  position: relative;
  transition: transform 300ms ease-out;
}
.hero-float-card:hover { transform: rotate(0deg) translateY(-4px); }
.hfc-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hfc-icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: var(--accent-glow);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.hfc-list { display: flex; flex-direction: column; gap: 14px; }
.hfc-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}
.hfc-item i { color: var(--accent); font-size: 16px; }

/* Section helpers */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  padding: 4px 12px;
  border: 1px solid rgba(34,211,238,0.2);
  background: rgba(34,211,238,0.06);
  border-radius: 9999px;
  margin-bottom: 12px;
}
.section-header { margin-bottom: 48px; }
.section-header.centered { text-align: center; }
.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-top: 8px;
  max-width: 640px;
}
.section-header.centered .section-desc { margin-left: auto; margin-right: auto; }
.text-link {
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  transition: color 150ms ease, gap 150ms ease;
}
.text-link:hover { color: var(--accent-hover); gap: 10px; }

/* Features */
.features {
  background: var(--bg-base);
}
.features-grid {
  display: grid;
  grid-template-columns: 1fr 45%;
  gap: 24px;
  align-items: stretch;
}
.feature-main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}
.feature-img {
  height: 260px;
  overflow: hidden;
}
.feature-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.feature-main-content { padding: 32px; flex: 1; }
.feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--accent-glow);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 16px;
}
.feature-icon.small {
  width: 40px; height: 40px;
  font-size: 15px;
  margin-bottom: 0;
  flex-shrink: 0;
}
.feature-main h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}
.feature-main p, .feature-side-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
}
.feature-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.feature-side-card {
  padding: 32px;
  display: flex;
  gap: 16px;
  flex: 1;
  align-items: flex-start;
}
.feature-side-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.feature-tags {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.tag-pill {
  padding: 8px 18px;
  border-radius: 9999px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 150ms ease;
}
.tag-pill:hover {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
  border-color: rgba(34,211,238,0.3);
}

/* Demo */
.demo {
  background: var(--bg-base);
}
.demo::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  pointer-events: none;
}
.demo-screen {
  aspect-ratio: 16 / 9;
  max-width: 90%;
  margin: 0 auto;
  border-radius: 16px;
  overflow: hidden;
  padding: 0;
  position: relative;
}
.demo-topbar {
  height: 44px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  background: rgba(13,20,32,0.9);
  border-bottom: 1px solid var(--glass-border);
}
.demo-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.demo-dot.red { background: #F87171; }
.demo-dot.yellow { background: var(--warm-accent); }
.demo-dot.green { background: #34D399; }
.demo-url {
  margin-left: 12px;
  font-size: 11px;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  padding: 3px 12px;
  border-radius: 6px;
}
.demo-body {
  display: grid;
  grid-template-columns: 180px 1fr;
  height: calc(100% - 44px);
  min-height: 300px;
}
.demo-sidebar {
  padding: 16px;
  background: rgba(10,15,26,0.8);
  border-right: 1px solid var(--glass-border);
}
.demo-menu {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  transition: all 150ms ease;
}
.demo-menu:hover { background: rgba(255,255,255,0.04); color: var(--text-primary); }
.demo-menu.active { background: rgba(34,211,238,0.12); color: var(--accent); }
.demo-main {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  overflow: hidden;
}
.demo-chart {
  flex: 1;
  min-height: 160px;
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(34,211,238,0.06), rgba(34,211,238,0.01));
  border: 1px solid rgba(255,255,255,0.06);
  position: relative;
  overflow: hidden;
}
.demo-chart img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.demo-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  position: relative;
  z-index: 2;
}
.demo-card-item {
  height: 80px;
  border-radius: 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}
.demo-steps {
  display: flex;
  justify-content: center;
  gap: 64px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.demo-step { display: flex; align-items: center; gap: 12px; }
.step-num {
  font-size: 32px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  opacity: 0.5;
}
.demo-step p { color: var(--text-secondary); font-size: 15px; }

/* Evidence */
.evidence { background: var(--bg-raised); }
.evidence-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.evidence-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat-card { padding: 28px; text-align: center; }
.stat-number {
  font-size: 40px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  line-height: 1.2;
}
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 8px; }
.evidence-quotes {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.quote-card {
  padding: 18px 24px;
  border-left: 3px solid var(--accent);
  background: rgba(255,255,255,0.02);
  border-radius: 0 12px 12px 0;
}
.quote-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}
.quote-source {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 12px;
}

/* Pricing */
.pricing { background: var(--bg-base); }
.pricing-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 48px;
  gap: 24px;
}
.pricing-header h2 { font-size: 36px; font-weight: 700; letter-spacing: -0.02em; }
.pricing-note { color: var(--text-secondary); font-size: 14px; max-width: 360px; line-height: 1.7; }
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr 1fr;
  gap: 24px;
  align-items: stretch;
}
.price-card {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  opacity: 0.92;
}
.price-card.featured {
  transform: scale(1.07);
  border-color: rgba(34,211,238,0.3);
  box-shadow: 0 0 30px rgba(34,211,238,0.15);
  z-index: 2;
  opacity: 1;
}
.price-name { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.price-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
.price-amount {
  font-size: 40px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  margin-bottom: 20px;
}
.price-amount .unit { font-size: 14px; color: var(--text-muted); font-weight: 400; }
.price-features {
  list-style: none;
  margin-bottom: 32px;
  flex: 1;
}
.price-features li {
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.price-features li i { color: var(--accent); font-size: 12px; }

/* News */
.news { background: var(--bg-raised); }
.news-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}
.news-timeline {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.news-row {
  padding: 24px;
  position: relative;
  overflow: hidden;
  border-radius: 14px;
}
.news-time-mark {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--warm-accent);
  border-radius: 3px;
}
.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.news-category {
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--warm-accent);
  background: rgba(245, 158, 11, 0.1);
  border-radius: 9999px;
}
.news-date { font-size: 12px; color: var(--text-muted); }
.news-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
}
.news-title a:hover { color: var(--accent); }
.news-summary {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 12px;
}
.news-link {
  color: var(--accent);
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.news-empty {
  grid-column: span 2;
  text-align: center;
  padding: 60px;
  color: var(--text-muted);
  font-size: 16px;
}

/* FAQ */
.faq { background: var(--bg-base); }
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  border-radius: 12px;
  overflow: hidden;
}
.faq-item.open { background: rgba(255,255,255,0.07); }
.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  transition: background 150ms ease;
}
.faq-question:hover { background: rgba(255,255,255,0.03); }
.faq-question i {
  font-size: 14px;
  color: var(--text-muted);
  transition: transform 200ms ease;
  flex-shrink: 0;
  margin-left: 16px;
}
.faq-item.open .faq-question i { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 200ms ease-out;
}
.faq-item.open .faq-answer { max-height: 320px; }
.faq-answer p {
  padding: 16px 24px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid rgba(255,255,255,0.06);
}

/* CTA section */
.cta-section { background: var(--bg-base); padding-top: 80px; padding-bottom: 80px; }
.cta-band {
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(34,211,238,0.12), transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(34,211,238,0.08), transparent 50%),
    var(--glass-bg);
}
.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}
.cta-band h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
}
.cta-band p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  position: relative;
}
.cta-band .btn-primary { position: relative; }

/* Footer */
.site-footer {
  background: #05080F;
  border-top: 1px solid rgba(34,211,238,0.12);
  padding-top: 64px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: inline-block;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 280px;
}
.footer-socials { display: flex; gap: 10px; }
.footer-socials a {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(255,255,255,0.03);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: all 150ms ease;
}
.footer-socials a:hover {
  color: var(--accent);
  border-color: rgba(34,211,238,0.3);
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 4px 0;
  transition: color 150ms ease;
}
.footer-col a:hover { color: var(--accent); }
.footer-contact p {
  color: var(--text-secondary);
  font-size: 14px;
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-contact i {
  width: 18px;
  color: var(--text-muted);
  text-align: center;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
}
.bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* Responsive */
@media (max-width: 1023.98px) {
  .site-header { display: none; }
  .mobile-topbar { display: flex; }
  .mobile-tab-nav { display: flex; }
  .floating-cta { bottom: 84px; right: 16px; padding: 10px 18px; font-size: 13px; }
  .hero { min-height: 92vh; padding-top: 96px; padding-bottom: 40px; }
  .hero-content { grid-template-columns: 1fr; gap: 32px; }
  .hero-float-card { max-width: 440px; transform: rotate(0deg); }
  .features-grid { grid-template-columns: 1fr; }
  .demo-screen { max-width: 100%; }
  .evidence-grid { grid-template-columns: 1fr; gap: 32px; }
  .pricing-grid { grid-template-columns: 1fr; gap: 16px; }
  .price-card.featured { transform: scale(1.02); }
}
@media (max-width: 768px) {
  .container-x { padding-left: 20px; padding-right: 20px; }
  .section { padding-top: 64px; padding-bottom: 64px; }
  .hero h1 { font-size: 38px; }
  .hero-subtitle { font-size: 16px; }
  .hero-metrics { gap: 20px; }
  .section-header h2 { font-size: 28px; }
  .section-header { margin-bottom: 32px; }
  .feature-tags { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 8px; }
  .feature-main-content { padding: 24px; }
  .feature-side-card { padding: 24px; flex-direction: column; }
  .demo-body { grid-template-columns: 120px 1fr; }
  .demo-steps { gap: 20px; flex-wrap: wrap; }
  .news-timeline { grid-template-columns: 1fr; }
  .news-empty { grid-column: span 1; }
  .pricing-header { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .cta-band { padding: 40px 24px; }
  .cta-band h2 { font-size: 22px; }
  .stat-number { font-size: 32px; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 32px; }
  .section-header h2 { font-size: 24px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .demo-cards { grid-template-columns: 1fr; }
  .demo-body { grid-template-columns: 1fr; }
  .demo-sidebar { display: none; }
  .bottom-inner { flex-direction: column; gap: 8px; }
  .hero-ctas .btn-primary, .hero-ctas .btn-glass { width: 100%; }
}

/* roulang page: category1 */
:root {
      --bg-base: #070B14;
      --bg-raised: #0E1526;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-bg-hover: rgba(255, 255, 255, 0.07);
      --accent: #22D3EE;
      --accent-hover: #67E8F9;
      --accent-glow: rgba(34, 211, 238, 0.25);
      --warm-accent: #F59E0B;
      --text-primary: #F1F5F9;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
    }

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

    html { scroll-behavior: smooth; }

    body {
      background-color: var(--bg-base);
      color: var(--text-primary);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
      font-size: 16px;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background:
        radial-gradient(circle at 15% 10%, rgba(34, 211, 238, 0.06), transparent 40%),
        radial-gradient(circle at 85% 90%, rgba(34, 211, 238, 0.04), transparent 35%),
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
      background-size: 100% 100%, 100% 100%, 36px 36px, 36px 36px;
      pointer-events: none;
      z-index: 0;
    }

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

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

    .container-x {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    @media (min-width: 1024px) {
      .container-x { padding-left: 32px; padding-right: 32px; }
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
      transition: transform 0.15s ease-out, box-shadow 0.15s ease-out, background 0.15s ease-out;
    }

    .glass-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4), 0 0 20px var(--accent-glow);
      background: var(--glass-bg-hover);
    }

    /* 按钮 */
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--accent);
      color: #081018;
      font-weight: 600;
      border: none;
      border-radius: 9999px;
      padding: 12px 28px;
      font-size: 15px;
      cursor: pointer;
      box-shadow: 0 0 20px var(--accent-glow);
      transition: background 0.15s ease-out, box-shadow 0.15s ease-out, transform 0.15s ease-out;
    }

    .btn-primary:hover { background: var(--accent-hover); box-shadow: 0 0 30px rgba(34, 211, 238, 0.3); }
    .btn-primary:active { transform: scale(0.98); }
    .btn-primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

    .btn-ghost {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: transparent;
      color: var(--text-primary);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 9999px;
      padding: 12px 28px;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.15s ease-out, border-color 0.15s ease-out, transform 0.15s ease-out;
    }

    .btn-ghost:hover { background: rgba(255, 255, 255, 0.06); border-color: rgba(255, 255, 255, 0.2); }
    .btn-ghost:active { transform: scale(0.98); }
    .btn-ghost:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

    .btn-sm { padding: 8px 20px; font-size: 14px; }

    /* ===== 导航 ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      height: 80px;
      display: flex;
      align-items: center;
      background: transparent;
      border-bottom: 1px solid transparent;
      transition: background 0.2s ease-out, height 0.2s ease-out, border-color 0.2s ease-out;
    }

    .site-header.scrolled {
      height: 64px;
      background: rgba(7, 11, 20, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

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

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      flex-shrink: 0;
    }

    .brand-icon {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(34, 211, 238, 0.15);
      border: 1px solid rgba(34, 211, 238, 0.3);
      border-radius: 10px;
      color: var(--accent);
      font-size: 16px;
    }

    .nav-menu {
      display: none;
      align-items: center;
      gap: 6px;
    }

    .nav-link {
      padding: 8px 14px;
      border-radius: 8px;
      font-size: 15px;
      color: var(--text-secondary);
      transition: color 0.15s ease-out, background 0.15s ease-out;
      white-space: nowrap;
    }

    .nav-link:hover { color: var(--text-primary); background: rgba(255, 255, 255, 0.04); }
    .nav-link.active { color: var(--accent); position: relative; }
    .nav-link.active::after {
      content: '';
      position: absolute;
      left: 14px;
      right: 14px;
      bottom: 2px;
      height: 2px;
      border-radius: 2px;
      background: var(--accent);
      box-shadow: 0 0 8px var(--accent-glow);
    }

    .nav-cta { display: none; }

    /* 移动端 top bar */
    .mobile-topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 56px;
      padding: 0 20px;
      background: rgba(7, 11, 20, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .mobile-topbar .brand { font-size: 17px; }
    .mobile-topbar .brand-icon { width: 28px; height: 28px; font-size: 13px; border-radius: 8px; }

    .hamburger-btn {
      background: transparent;
      border: none;
      color: var(--text-primary);
      font-size: 20px;
      cursor: pointer;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
    }

    .hamburger-btn:hover { background: rgba(255, 255, 255, 0.06); }

    .mobile-drawer {
      position: fixed;
      top: 56px;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(7, 11, 20, 0.97);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      z-index: 99;
      padding: 30px 28px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      transform: translateX(100%);
      transition: transform 0.25s ease-out;
      visibility: hidden;
    }

    .mobile-drawer.open {
      transform: translateX(0);
      visibility: visible;
    }

    .mobile-drawer a {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-primary);
      padding: 16px 12px;
      border-radius: 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }

    .mobile-drawer a:hover { background: rgba(255, 255, 255, 0.05); }
    .mobile-drawer a.active { color: var(--accent); }

    /* 移动端底部 Tab */
    .mobile-tabbar {
      position: fixed;
      bottom: 16px;
      left: 20px;
      right: 20px;
      height: 56px;
      background: rgba(14, 21, 38, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      z-index: 90;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2px;
      font-size: 11px;
      color: var(--text-muted);
      flex: 1;
      height: 100%;
      border-radius: 16px;
      transition: color 0.15s ease-out;
    }

    .tab-item i { font-size: 16px; }
    .tab-item.active { color: var(--accent); }
    .tab-item:hover { color: var(--text-secondary); }

    /* 浮动 CTA */
    .floating-cta {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 80;
      opacity: 0;
      visibility: hidden;
      transform: translateY(12px);
      transition: opacity 0.2s ease-out, transform 0.2s ease-out, visibility 0.2s ease-out;
    }

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

    @media (min-width: 1024px) {
      .nav-menu { display: flex; }
      .nav-cta { display: inline-flex; }
      .mobile-topbar, .mobile-drawer, .mobile-tabbar { display: none; }
    }

    @media (max-width: 1023px) {
      .site-header { display: none; }
      .floating-cta { bottom: 88px; right: 16px; }
      .floating-cta .btn-primary { padding: 10px 18px; font-size: 13px; }
    }

    /* ===== 分类 Hero ===== */
    .cat-hero {
      position: relative;
      min-height: 70vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 120px 0 80px;
      background:
        linear-gradient(rgba(7, 11, 20, 0.7), rgba(7, 11, 20, 0.9)),
        url('/assets/images/backpic/back-1.png') no-repeat center center / cover;
      overflow: hidden;
    }

    .cat-hero-inner { position: relative; z-index: 2; max-width: 800px; }

    .cat-hero h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
    }

    .cat-hero .subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 28px;
      max-width: 520px;
      margin-left: auto;
      margin-right: auto;
    }

    .cat-hero .hero-ctas {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      justify-content: center;
    }

    .breadcrumb {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text-muted);
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.06);
      padding: 6px 16px;
      border-radius: 9999px;
      margin-bottom: 24px;
    }

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

    @media (min-width: 768px) {
      .cat-hero h1 { font-size: 40px; }
      .cat-hero .subtitle { font-size: 18px; }
    }

    /* ===== 图文交错区 ===== */
    .guide-content {
      padding: 80px 0;
    }

    .section-head {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-head h2 {
      font-size: 30px;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 8px;
    }

    .section-head p {
      font-size: 15px;
      color: var(--text-secondary);
      max-width: 560px;
      margin: 0 auto;
    }

    .stagger-list {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .stagger-card {
      display: flex;
      flex-direction: column;
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
      overflow: hidden;
    }

    .stagger-card .card-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 0;
    }

    .stagger-card .card-body {
      padding: 24px;
      flex: 1;
    }

    .stagger-card .card-body h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .stagger-card .card-body p {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.7;
    }

    .stagger-card .card-meta {
      margin-top: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 13px;
      color: var(--text-muted);
    }

    .stagger-card .card-meta .tag {
      background: rgba(34, 211, 238, 0.1);
      color: var(--accent);
      padding: 3px 12px;
      border-radius: 9999px;
      font-size: 12px;
      font-weight: 500;
    }

    @media (min-width: 768px) {
      .stagger-card {
        flex-direction: row;
        align-items: center;
        padding: 20px;
      }

      .stagger-card .card-img {
        width: 200px;
        height: 160px;
        flex-shrink: 0;
        border-radius: 12px;
      }

      .stagger-card .card-body { padding: 8px 24px; }

      .stagger-card.reversed {
        flex-direction: row-reverse;
      }

      .stagger-card.reversed .card-body {
        text-align: right;
      }

      .stagger-card.reversed .card-meta {
        justify-content: flex-end;
      }
    }

    /* ===== 适用场景 ===== */
    .scenarios {
      background: var(--bg-raised);
      padding: 80px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }

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

    .scenario-card {
      text-align: center;
      padding: 30px 20px;
    }

    .scenario-card i {
      font-size: 28px;
      color: var(--accent);
      margin-bottom: 16px;
      display: inline-block;
      width: 60px;
      height: 60px;
      line-height: 60px;
      border-radius: 16px;
      background: rgba(34, 211, 238, 0.1);
      border: 1px solid rgba(34, 211, 238, 0.2);
    }

    .scenario-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }

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

    @media (min-width: 640px) {
      .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (min-width: 1024px) {
      .scenario-grid { grid-template-columns: repeat(4, 1fr); }
    }

    /* ===== 服务流程 ===== */
    .process {
      padding: 80px 0;
    }

    .process-steps {
      display: flex;
      flex-direction: column;
      gap: 20px;
      max-width: 760px;
      margin: 0 auto;
    }

    .process-step {
      display: flex;
      gap: 18px;
      align-items: flex-start;
      padding: 24px;
    }

    .process-step .step-num {
      flex-shrink: 0;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: rgba(34, 211, 238, 0.1);
      border: 1px solid rgba(34, 211, 238, 0.25);
      color: var(--accent);
      font-size: 17px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-variant-numeric: tabular-nums;
    }

    .process-step h3 {
      font-size: 17px;
      font-weight: 600;
      margin-bottom: 4px;
    }

    .process-step p {
      font-size: 14px;
      color: var(--text-secondary);
    }

    @media (min-width: 768px) {
      .process-steps { flex-direction: row; flex-wrap: wrap; gap: 16px; }
      .process-step { flex: 1 1 calc(50% - 16px); }
    }

    @media (min-width: 1024px) {
      .process-step { flex: 1 1 calc(33.3% - 16px); }
    }

    /* ===== FAQ ===== */
    .faq-section {
      padding: 80px 0;
      background: var(--bg-raised);
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }

    .faq-list {
      max-width: 760px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      border-radius: 12px;
      overflow: hidden;
      transition: background 0.15s ease-out;
    }

    .faq-item.open {
      background: rgba(255, 255, 255, 0.06);
      border-color: rgba(255, 255, 255, 0.12);
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 22px;
      background: transparent;
      border: none;
      color: var(--text-primary);
      font-size: 16px;
      font-weight: 500;
      text-align: left;
      cursor: pointer;
      gap: 16px;
    }

    .faq-question i {
      flex-shrink: 0;
      color: var(--text-muted);
      transition: transform 0.2s ease-out, color 0.2s ease-out;
    }

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

    .faq-answer {
      padding: 0 22px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease-out, padding 0.25s ease-out;
      color: var(--text-secondary);
      font-size: 14px;
      line-height: 1.7;
    }

    .faq-item.open .faq-answer {
      padding: 0 22px 20px;
      max-height: 300px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 14px;
      margin-top: 0;
    }

    /* ===== CTA 区 ===== */
    .cta-section {
      padding: 80px 0;
      position: relative;
      overflow: hidden;
    }

    .cta-section::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 50% 50%, rgba(34, 211, 238, 0.08), transparent 60%);
      pointer-events: none;
    }

    .cta-box {
      max-width: 900px;
      margin: 0 auto;
      padding: 40px 32px;
      text-align: center;
      position: relative;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 24px;
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
    }

    .cta-box h2 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .cta-box p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 28px;
    }

    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 520px;
      margin: 0 auto;
    }

    .cta-form input,
    .cta-form textarea {
      width: 100%;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 8px;
      height: 44px;
      padding: 0 16px;
      color: var(--text-primary);
      font-size: 14px;
      outline: none;
      transition: border-color 0.15s ease-out, box-shadow 0.15s ease-out;
    }

    .cta-form textarea {
      height: 100px;
      padding: 14px 16px;
      resize: vertical;
    }

    .cta-form input:focus,
    .cta-form textarea:focus {
      border-color: var(--accent);
      box-shadow: 0 0 4px var(--accent-glow);
    }

    .cta-form input::placeholder,
    .cta-form textarea::placeholder {
      color: var(--text-muted);
    }

    @media (min-width: 768px) {
      .cta-box { padding: 50px 60px; }
    }

    /* ===== 相关分类 ===== */
    .related-cats {
      padding: 40px 0 0;
      text-align: center;
    }

    .related-cats h4 {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 14px;
      font-weight: 500;
    }

    .cat-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .cat-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 18px;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 9999px;
      font-size: 14px;
      color: var(--text-secondary);
      transition: all 0.15s ease-out;
    }

    .cat-pill i { color: var(--accent); font-size: 13px; }
    .cat-pill:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: rgba(34, 211, 238, 0.08);
    }

    /* ===== 页脚 ===== */
    .site-footer {
      background: #05080F;
      border-top: 1px solid rgba(34, 211, 238, 0.15);
      padding-top: 60px;
      position: relative;
      z-index: 1;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 32px;
      padding-bottom: 40px;
    }

    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 12px;
    }

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

    .footer-socials {
      display: flex;
      gap: 10px;
      margin-top: 18px;
    }

    .footer-socials a {
      width: 36px;
      height: 36px;
      border-radius: 10px;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      font-size: 15px;
      transition: all 0.15s ease-out;
    }

    .footer-socials a:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: rgba(34, 211, 238, 0.08);
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 14px;
    }

    .footer-col a {
      display: block;
      padding: 5px 0;
      font-size: 14px;
      color: var(--text-muted);
      transition: color 0.15s ease-out;
    }

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

    .footer-contact p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-contact i { color: var(--accent); width: 16px; }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      padding: 20px 0;
    }

    .bottom-inner {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: space-between;
      color: var(--text-muted);
      font-size: 13px;
    }

    @media (min-width: 768px) {
      .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
        gap: 24px;
      }
    }

/* roulang page: category2 */
:root {
  --bg-base: #070B14;
  --bg-raised: #0E1526;
  --glass-bg: rgba(255,255,255,0.04);
  --glass-bg-hover: rgba(255,255,255,0.07);
  --glass-border: rgba(255,255,255,0.08);
  --accent: #22D3EE;
  --accent-hover: #67E8F9;
  --accent-glow: rgba(34,211,238,0.25);
  --warm-accent: #F59E0B;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { background: none; border: none; color: inherit; font: inherit; cursor: pointer; }
::-webkit-scrollbar { width: 10px; background: #0B1220; }
::-webkit-scrollbar-thumb { background: #1E293B; border-radius: 8px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.container-x { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* 玻璃卡片 */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: transform .15s ease-out, box-shadow .15s ease-out, background .15s ease-out, border-color .15s ease-out;
}
.glass-card:hover {
  transform: translateY(-2px);
  background: var(--glass-bg-hover);
  box-shadow: 0 12px 40px rgba(0,0,0,0.45), 0 0 20px var(--accent-glow);
}

/* 按钮 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #062A3A;
  font-weight: 600;
  border-radius: 9999px;
  padding: 12px 28px;
  font-size: 15px;
  border: none;
  transition: all .15s ease-out;
  box-shadow: 0 0 20px rgba(34,211,238,0.15);
  cursor: pointer;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 0 30px rgba(34,211,238,0.3); transform: translateY(-1px); color: #062A3A; }
.btn-primary:active { transform: scale(0.98); }
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 9999px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  transition: all .15s ease-out;
  cursor: pointer;
}
.btn-ghost:hover { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.22); transform: translateY(-1px); }
.btn-ghost:active { transform: scale(0.98); }
.btn-sm.btn-ghost { padding: 8px 20px; font-size: 14px; }

/* 标签/徽章 */
.badge {
  display: inline-flex;
  align-items: center;
  background: rgba(34,211,238,0.12);
  border: 1px solid rgba(34,211,238,0.25);
  color: var(--accent-hover);
  font-size: 12px;
  font-weight: 500;
  border-radius: 9999px;
  padding: 3px 14px;
  letter-spacing: .03em;
}
.badge-warm {
  background: rgba(245,158,11,0.12);
  border-color: rgba(245,158,11,0.25);
  color: var(--warm-accent);
}

/* 导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  height: 80px;
  display: flex;
  align-items: center;
  background: rgba(7,11,20,0.55);
  border-bottom: 1px solid transparent;
  transition: all .2s ease-out;
}
.site-header.scrolled {
  height: 64px;
  background: rgba(7,11,20,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: rgba(255,255,255,0.06);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; color: var(--text-primary); letter-spacing: -0.02em; white-space: nowrap; }
.brand-icon {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(34,211,238,0.14);
  border: 1px solid rgba(34,211,238,0.3);
  border-radius: 10px;
  color: var(--accent);
  font-size: 17px;
  flex-shrink: 0;
}
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all .15s ease-out;
  white-space: nowrap;
}
.nav-link:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-link.active { color: var(--accent-hover); }
.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--accent);
}
.nav-cta { flex-shrink: 0; }
.menu-toggle { display: none; }

/* 面包屑 */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-muted); margin-bottom: 24px; flex-wrap: wrap; }
.breadcrumb a { color: var(--text-secondary); transition: color .15s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb i { font-size: 10px; color: var(--text-muted); }
.breadcrumb span { color: var(--text-primary); font-weight: 500; }

/* Hero */
.cat-hero {
  position: relative;
  padding: 180px 0 100px;
  background-size: cover;
  background-position: center;
  background-color: var(--bg-raised);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.cat-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(7,11,20,0.72);
  backdrop-filter: brightness(0.85);
}
.cat-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(34,211,238,0.08), transparent 55%);
  pointer-events: none;
}
.cat-hero .container-x { position: relative; z-index: 2; }
.cat-hero-content { max-width: 720px; }
.cat-hero h1 {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.cat-hero-desc { font-size: 18px; color: var(--text-secondary); margin-bottom: 32px; max-width: 600px; }
.cat-hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* 区块 */
.section { padding: 96px 0; position: relative; background: var(--bg-base); }
.section-alt { background: var(--bg-raised); }
.section-head { margin-bottom: 56px; }
.section-head.center { text-align: center; }
.section-head h2 { font-size: 36px; font-weight: 700; letter-spacing: -0.02em; color: var(--text-primary); margin-bottom: 12px; }
.section-head p { font-size: 16px; color: var(--text-secondary); }
.section-head.center p { max-width: 640px; margin: 0 auto; }

/* 不对称亮点 */
.highlight-grid { display: grid; grid-template-columns: 5fr 4fr; gap: 24px; align-items: stretch; }
.highlight-main { padding: 40px; display: flex; flex-direction: column; }
.highlight-main i { font-size: 30px; color: var(--accent); margin-bottom: 20px; }
.highlight-main h3 { font-size: 23px; font-weight: 700; margin-bottom: 14px; }
.highlight-main p { font-size: 15px; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.8; }
.highlight-main img { border-radius: var(--radius-md); object-fit: cover; width: 100%; height: 180px; margin-top: auto; }
.highlight-side { display: flex; flex-direction: column; gap: 24px; }
.highlight-side .glass-card { padding: 28px; flex: 1; display: flex; flex-direction: column; justify-content: center; }
.highlight-side i { font-size: 22px; color: var(--accent); margin-bottom: 12px; }
.highlight-side h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.highlight-side p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* 流程 */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 32px 24px;
  transition: all .15s ease-out;
  position: relative;
}
.step-card:hover { transform: translateY(-2px); background: var(--glass-bg-hover); box-shadow: 0 12px 40px rgba(0,0,0,0.45), 0 0 20px var(--accent-glow); }
.step-num {
  font-size: 40px;
  font-weight: 700;
  color: rgba(34,211,238,0.18);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  display: block;
  margin-bottom: 16px;
}
.step-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.step-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* 图文交错 */
.alternate-list { display: flex; flex-direction: column; gap: 32px; }
.alt-row {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 28px;
  transition: all .15s ease-out;
}
.alt-row:hover { transform: translateY(-2px); background: var(--glass-bg-hover); box-shadow: 0 12px 40px rgba(0,0,0,0.45), 0 0 20px var(--accent-glow); }
.alt-row.reverse .alt-media { order: 2; }
.alt-row.reverse .alt-body { order: 1; }
.alt-media { border-radius: var(--radius-md); overflow: hidden; }
.alt-media img { width: 100%; height: 180px; object-fit: cover; }
.alt-body { padding: 8px 8px 8px 0; }
.alt-body .badge { margin-bottom: 12px; }
.alt-body h3 { font-size: 21px; font-weight: 700; margin-bottom: 12px; }
.alt-body p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; }

/* 适用场景 */
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scenario-card { padding: 36px 28px; text-align: left; }
.scenario-card i { font-size: 26px; color: var(--accent); margin-bottom: 16px; display: inline-block; }
.scenario-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.scenario-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 16px; max-width: 880px; margin: 0 auto; }
.faq-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: background .15s ease-out, border-color .15s ease-out;
}
.faq-item.active { background: rgba(255,255,255,0.07); border-color: rgba(34,211,238,0.25); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  padding: 22px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  transition: color .15s;
  gap: 16px;
}
.faq-question i { font-size: 14px; color: var(--text-muted); transition: transform .2s ease-out, color .2s; flex-shrink: 0; }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease-out, padding .3s ease-out;
  padding: 0 24px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px solid transparent;
}
.faq-item.active .faq-answer { max-height: 400px; padding: 0 24px 22px; border-top-color: rgba(255,255,255,0.07); }
.faq-answer p { padding-top: 16px; }

/* CTA */
.cta-card {
  background: linear-gradient(135deg, rgba(34,211,238,0.08), rgba(255,255,255,0.02));
  border: 1px solid rgba(34,211,238,0.2);
  border-radius: 20px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 64px 48px;
  text-align: center;
  box-shadow: 0 0 40px rgba(34,211,238,0.08);
}
.cta-card h2 { font-size: 28px; font-weight: 700; margin-bottom: 16px; letter-spacing: -0.02em; }
.cta-card p { font-size: 15px; color: var(--text-secondary); margin-bottom: 32px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* 相关分类 */
.related-cats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.related-cats span { font-size: 13px; color: var(--text-muted); }
.chip-link {
  display: inline-flex;
  align-items: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 9999px;
  padding: 6px 18px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all .15s ease-out;
}
.chip-link:hover { background: rgba(34,211,238,0.1); border-color: rgba(34,211,238,0.3); color: var(--accent-hover); }

/* 页脚 */
.site-footer { background: #05080F; border-top: 1px solid rgba(34,211,238,0.12); padding: 64px 0 0 0; margin-top: 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-logo { font-size: 20px; font-weight: 700; color: var(--text-primary); letter-spacing: -0.02em; display: inline-flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand p { font-size: 14px; color: var(--text-muted); line-height: 1.75; margin-bottom: 20px; max-width: 280px; }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 16px;
  transition: all .15s ease-out;
}
.footer-socials a:hover { background: rgba(34,211,238,0.1); border-color: rgba(34,211,238,0.3); color: var(--accent); }
.footer-col h4 { font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 16px; letter-spacing: .02em; }
.footer-col a { display: block; font-size: 14px; color: var(--text-muted); line-height: 2.2; transition: color .15s; }
.footer-col a:hover { color: var(--accent); }
.footer-contact p { font-size: 14px; color: var(--text-muted); line-height: 2.2; margin-bottom: 0; display: flex; align-items: center; gap: 10px; }
.footer-contact i { color: var(--accent); font-size: 14px; width: 18px; text-align: center; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.05); padding: 20px 0; }
.bottom-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--text-muted); }

/* 浮动CTA */
.floating-cta {
  position: fixed;
  right: 32px;
  bottom: 32px;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all .25s ease-out;
}
.floating-cta.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.floating-cta .btn-primary { box-shadow: 0 0 30px rgba(34,211,238,0.25); }

/* 移动端底部Tab */
.mobile-bottom-tab {
  display: none;
  position: fixed;
  bottom: 16px;
  left: 20px;
  right: 20px;
  height: 56px;
  z-index: 1000;
  background: rgba(7,11,20,0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 8px;
}
.tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 12px;
  border-radius: 12px;
  color: var(--text-muted);
  font-size: 10px;
  transition: all .15s ease-out;
}
.tab-item i { font-size: 17px; }
.tab-item span { font-size: 11px; }
.tab-item:hover { color: var(--text-secondary); background: rgba(255,255,255,0.04); }
.tab-item.active { color: var(--accent); }
.tab-item.active i { text-shadow: 0 0 12px var(--accent-glow); }

/* 响应式 */
@media (max-width: 1023px) {
  .nav-menu { display: none; }
  .nav-cta { display: none; }
  .menu-toggle { display: flex; width: 40px; height: 40px; align-items: center; justify-content: center; border-radius: 10px; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); color: var(--text-primary); font-size: 18px; }
  .nav-inner { justify-content: space-between; }
  .mobile-bottom-tab { display: flex; }
  .floating-cta { right: 20px; bottom: 80px; }
  body { padding-bottom: 80px; }
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1100;
  background: rgba(7,11,20,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 80px 40px 40px;
  flex-direction: column;
  gap: 20px;
}
.mobile-drawer.open { display: flex; }
.mobile-drawer a {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  gap: 14px;
}
.mobile-drawer a i { color: var(--accent); font-size: 17px; width: 22px; text-align: center; }
.mobile-drawer a.active { color: var(--accent-hover); }
.mobile-drawer-close { position: absolute; top: 20px; right: 24px; font-size: 22px; color: var(--text-secondary); background: rgba(255,255,255,0.06); border-radius: 10px; width: 42px; height: 42px; display: flex; align-items: center; justify-content: center; }

@media (max-width: 768px) {
  .container-x { padding: 0 20px; }
  .cat-hero { padding: 140px 0 64px; }
  .cat-hero h1 { font-size: 32px; }
  .cat-hero-desc { font-size: 16px; }
  .section { padding: 64px 0; }
  .section-head h2 { font-size: 28px; }
  .highlight-grid { grid-template-columns: 1fr; }
  .highlight-main { padding: 28px; }
  .steps-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .alt-row { grid-template-columns: 1fr; gap: 20px; }
  .alt-row.reverse .alt-media { order: 0; }
  .alt-row.reverse .alt-body { order: 1; }
  .alt-media img { height: 200px; }
  .scenario-grid { grid-template-columns: 1fr; }
  .cta-card { padding: 40px 24px; }
  .cta-card h2 { font-size: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .site-header { height: 64px; }
  .brand { font-size: 16px; }
  .brand-icon { width: 32px; height: 32px; font-size: 14px; }
  .breadcrumb { margin-bottom: 16px; }
}

@media (max-width: 520px) {
  .container-x { padding: 0 16px; }
  .steps-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .nav-cta { display: none; }
  .cat-hero-actions .btn-primary, .cat-hero-actions .btn-ghost { width: 100%; }
  .cta-actions .btn-primary, .cta-actions .btn-ghost { width: 100%; }
  .mobile-bottom-tab { left: 12px; right: 12px; }
}

/* roulang page: article */
:root {
  --bg-base: #070B14;
  --bg-raised: #0E1526;
  --glass-bg: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.08);
  --glass-bg-hover: rgba(255,255,255,0.07);
  --accent: #22D3EE;
  --accent-hover: #67E8F9;
  --accent-glow: rgba(34,211,238,0.25);
  --warm-accent: #F59E0B;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --radius-card: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
  --transition: 150ms ease-out;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background-color:var(--bg-base);
  color:var(--text-primary);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;border:none;cursor:pointer;background:none;color:inherit}
ul,ol{list-style:none}
.container-x{max-width:1200px;margin:0 auto;padding-left:32px;padding-right:32px}

/* Header */
.site-header{
  position:fixed;top:0;left:0;right:0;height:80px;z-index:100;
  display:flex;align-items:center;background:transparent;
  transition:all .3s ease;border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:rgba(7,11,20,.85);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  height:64px;border-bottom-color:rgba(255,255,255,.06);
}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:22px;font-weight:700;letter-spacing:-.02em;white-space:nowrap}
.brand-icon{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:10px;background:rgba(34,211,238,.12);border:1px solid rgba(34,211,238,.3);color:var(--accent);font-size:18px}
.nav-menu{display:flex;align-items:center;gap:28px}
.nav-link{font-size:15px;color:var(--text-secondary);font-weight:500;padding:8px 0;position:relative;transition:color var(--transition);white-space:nowrap}
.nav-link:hover{color:var(--text-primary)}
.nav-link::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--accent);border-radius:2px;transition:width .3s ease}
.nav-link:hover::after,.nav-link.active::after{width:100%}
.nav-link.active{color:var(--accent)}

/* Buttons */
.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--accent);color:#062A33 !important;font-weight:700;border-radius:9999px;padding:12px 28px;font-size:15px;box-shadow:0 0 20px rgba(34,211,238,.15);transition:all var(--transition);border:1px solid transparent;line-height:1.2}
.btn-primary:hover{background:var(--accent-hover);box-shadow:0 0 30px rgba(34,211,238,.3);transform:translateY(-1px)}
.btn-primary:active{transform:scale(.98)}
.btn-sm{padding:10px 22px;font-size:14px}
.btn-glass{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:transparent;border:1px solid rgba(255,255,255,.12);color:var(--text-primary);border-radius:9999px;padding:12px 28px;font-size:15px;font-weight:500;transition:all var(--transition);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.btn-glass:hover{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.25);transform:translateY(-1px)}
.btn-glass:active{transform:scale(.98)}

/* Article */
.article-main{padding-top:80px;min-height:80vh}
.article-hero{
  padding:60px 0 32px;position:relative;
  background:linear-gradient(rgba(7,11,20,.85),rgba(7,11,20,.95)),url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  border-bottom:1px solid rgba(255,255,255,.04);
}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:14px;color:var(--text-muted);margin-bottom:24px}
.breadcrumb a{color:var(--text-secondary);transition:color var(--transition)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb-sep{color:var(--text-muted);font-size:12px}
.breadcrumb-current{color:var(--text-secondary);max-width:320px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.article-title{font-size:32px;font-weight:700;color:var(--text-primary);letter-spacing:-.02em;line-height:1.3;margin-bottom:20px;word-break:break-word}
.article-meta{display:flex;flex-wrap:wrap;gap:20px;color:var(--text-muted);font-size:14px;align-items:center}
.meta-item{display:inline-flex;align-items:center;gap:6px}
.meta-item i{color:var(--accent);font-size:13px}
.meta-category{display:inline-flex;align-items:center;gap:4px;background:rgba(34,211,238,.08);border:1px solid rgba(34,211,238,.2);padding:3px 12px;border-radius:9999px;color:var(--accent);font-size:13px}

.article-body-section{padding:40px 0 64px;background:var(--bg-base)}
.article-content{max-width:680px;margin:0 auto;font-size:16px;line-height:1.8;color:#C0CCDA}
.article-content p{margin-bottom:24px}
.article-content h2{font-size:22px;font-weight:700;color:var(--text-primary);margin:48px 0 16px;line-height:1.4}
.article-content h3{font-size:18px;font-weight:600;color:var(--text-primary);margin:32px 0 12px}
.article-content img{border-radius:12px;margin:16px 0;width:100%;height:auto;object-fit:cover}
.article-content blockquote{border-left:4px solid var(--accent);background:rgba(255,255,255,.03);border-radius:8px;padding:16px 20px;margin:24px 0;color:var(--text-secondary)}
.article-content code{background:#0D1420;border:1px solid #1E293B;border-radius:6px;padding:2px 8px;font-family:"SFMono-Regular",Consolas,monospace;font-size:14px;color:var(--accent-hover)}
.article-content pre{background:#0D1420;border:1px solid #1E293B;border-radius:8px;padding:20px;overflow-x:auto;margin:24px 0}
.article-content pre code{border:none;background:transparent;padding:0}
.article-content table{width:100%;border-collapse:collapse;margin:24px 0;background:#0D1420;border-radius:8px;overflow:hidden}
.article-content th,.article-content td{padding:12px 16px;border:1px solid #1E293B;text-align:left;font-size:14px}
.article-content th{background:rgba(255,255,255,.04);font-weight:600;color:var(--text-primary)}
.article-content a{color:var(--accent);border-bottom:1px solid rgba(34,211,238,.3);transition:all var(--transition)}
.article-content a:hover{color:var(--accent-hover);border-bottom-color:var(--accent)}
.article-content ul,.article-content ol{margin:0 0 24px;padding-left:24px}
.article-content ul{list-style:disc}
.article-content ol{list-style:decimal}
.article-content li{margin-bottom:8px}

.not-found-card{max-width:680px;margin:0 auto;text-align:center;background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-card);padding:60px 40px;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.not-found-icon{font-size:48px;color:var(--text-muted);margin-bottom:20px}
.not-found-title{font-size:24px;font-weight:700;color:var(--text-primary);margin-bottom:12px}
.not-found-text{color:var(--text-secondary);margin-bottom:24px}

/* Related */
.related-section{padding:64px 0 80px;background:var(--bg-raised);border-top:1px solid rgba(255,255,255,.04)}
.section-head{text-align:center;margin-bottom:44px}
.section-head h2{font-size:32px;font-weight:700;color:var(--text-primary);letter-spacing:-.02em}
.section-head p{color:var(--text-secondary);font-size:15px;margin-top:8px}
.related-grid{max-width:800px;margin:0 auto 36px}
.related-card{display:flex;flex-direction:column;background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-card);overflow:hidden;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);transition:all var(--transition);height:100%}
.related-card:hover{background:var(--glass-bg-hover);border-color:rgba(255,255,255,.14);transform:translateY(-2px);box-shadow:var(--shadow-card)}
.related-img{aspect-ratio:16/9;overflow:hidden;background:#0E1526}
.related-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.related-card:hover .related-img img{transform:scale(1.03)}
.related-body{padding:24px;display:flex;flex-direction:column;flex:1}
.related-badge{font-size:12px;color:var(--warm-accent);margin-bottom:10px;font-weight:500;letter-spacing:.02em}
.related-body h3{font-size:18px;font-weight:700;color:var(--text-primary);margin-bottom:8px}
.related-body p{font-size:14px;color:var(--text-secondary);margin-bottom:16px;flex:1;line-height:1.6}
.related-link{font-size:14px;color:var(--accent);font-weight:500;display:inline-flex;align-items:center;gap:6px;transition:gap .2s ease}
.related-card:hover .related-link{gap:10px}
.related-actions{text-align:center}

/* Footer */
.site-footer{background:#05080F;border-top:1px solid rgba(34,211,238,.15);padding-top:60px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:50px}
.footer-logo{font-size:22px;font-weight:700;color:var(--text-primary);display:inline-flex;align-items:center;gap:8px;margin-bottom:16px}
.footer-brand p{font-size:14px;color:var(--text-muted);line-height:1.7;margin-bottom:20px;max-width:280px}
.footer-socials{display:flex;gap:12px}
.footer-socials a{width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;border:1px solid var(--glass-border);background:var(--glass-bg);color:var(--text-secondary);font-size:16px;transition:all var(--transition)}
.footer-socials a:hover{color:var(--accent);border-color:rgba(34,211,238,.4);background:rgba(34,211,238,.08)}
.footer-col h4{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:20px}
.footer-col a{display:block;font-size:14px;color:var(--text-secondary);margin-bottom:12px;transition:color var(--transition)}
.footer-col a:hover{color:var(--accent)}
.footer-contact p{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text-secondary);margin-bottom:14px}
.footer-contact i{color:var(--accent);width:16px;text-align:center}
.footer-bottom{border-top:1px solid rgba(255,255,255,.05);padding:20px 0}
.bottom-inner{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--text-muted);flex-wrap:wrap;gap:8px}

/* Float CTA */
.float-cta{position:fixed;right:24px;bottom:24px;z-index:200;opacity:0;visibility:hidden;transform:translateY(12px);transition:all .3s ease}
.float-cta.visible{opacity:1;visibility:visible;transform:translateY(0)}

/* Mobile */
.mobile-topbar{display:none;position:fixed;top:0;left:0;right:0;height:56px;align-items:center;justify-content:space-between;background:rgba(7,11,20,.85);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);z-index:110;padding:0 20px;border-bottom:1px solid rgba(255,255,255,.06)}
.mobile-brand{display:inline-flex;align-items:center;gap:8px;font-size:18px;font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mobile-hamburger{width:40px;height:40px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;border-radius:10px;flex-shrink:0}
.mobile-hamburger span{width:18px;height:2px;background:var(--text-primary);border-radius:2px;display:block;transition:all .3s ease}
.mobile-drawer{position:fixed;inset:0;background:rgba(7,11,20,.96);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);z-index:300;padding:30px;display:flex;flex-direction:column;opacity:0;visibility:hidden;transform:translateX(100%);transition:all .4s cubic-bezier(.25,.8,.25,1)}
.mobile-drawer.open{opacity:1;visibility:visible;transform:translateX(0)}
.drawer-close{display:flex;justify-content:flex-end;margin-bottom:40px}
.drawer-close-btn{width:44px;height:44px;display:flex;align-items:center;justify-content:center;border-radius:12px;background:var(--glass-bg);border:1px solid var(--glass-border);color:var(--text-primary);font-size:20px}
.drawer-nav{display:flex;flex-direction:column;gap:4px;overflow-y:auto}
.drawer-nav a{font-size:18px;font-weight:500;color:var(--text-secondary);padding:14px 0;border-bottom:1px solid rgba(255,255,255,.05);transition:all var(--transition)}
.drawer-nav a:hover{color:var(--accent);padding-left:8px}
.mobile-tabbar{display:none;position:fixed;bottom:16px;left:20px;right:20px;height:56px;background:rgba(14,21,38,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--glass-border);border-radius:16px;z-index:200;align-items:center;justify-content:space-around;box-shadow:0 8px 32px rgba(0,0,0,.4)}
.tab-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--text-secondary);font-size:11px;padding:6px 0;flex:1;transition:color var(--transition)}
.tab-item i{font-size:18px}
.tab-item:hover,.tab-item.active{color:var(--accent)}

@media (max-width:1023px){
  .site-header{display:none}
  .mobile-topbar{display:flex}
  .mobile-tabbar{display:flex}
  .article-main{padding-top:56px}
  .article-hero{padding-top:36px}
  .float-cta{bottom:88px;right:20px}
}
@media (max-width:768px){
  .container-x{padding-left:20px;padding-right:20px}
  .article-title{font-size:24px}
  .article-hero{padding:32px 0 24px}
  .related-grid{grid-template-columns:1fr !important}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px}
  .related-section{padding:48px 0 64px}
  .section-head h2{font-size:26px}
}
@media (max-width:520px){
  .footer-grid{grid-template-columns:1fr}
  .article-meta{gap:12px}
  .nav-menu{gap:14px}
  .bottom-inner{flex-direction:column;text-align:center}
  .breadcrumb-current{max-width:180px}
}