/* roulang page: index */
:root {
  --color-bg: #080B14;
  --color-bg-soft: #0D1220;
  --color-primary: #176BFF;
  --color-secondary: #35E0FF;
  --color-accent: #7A5CFF;
  --color-success: #2EE6A0;
  --color-text: #E6EDF7;
  --color-text-secondary: #94A3B8;
  --color-text-muted: #5B6B85;
  --color-card: rgba(255,255,255,0.045);
  --color-border: rgba(255,255,255,0.08);
  --color-border-hover: rgba(53,224,255,0.4);
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 24px;
  --shadow-card: 0 8px 30px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 20px rgba(53,224,255,0.35);
  --shadow-glow-hover: 0 0 32px rgba(53,224,255,0.6);
  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid rgba(53,224,255,0.5);
  outline-offset: 2px;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-pad { padding: 96px 0; }

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 72px;
  background: rgba(8,12,24,0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(53,224,255,0.25);
}
.header-inner { display: flex; align-items: center; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 1.3rem; font-weight: 700; letter-spacing: -0.01em; }
.brand-mark {
  width: 34px; height: 34px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 9px;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 0 16px rgba(23,107,255,0.5);
}
.brand-mark svg { width: 18px; height: 18px; fill: #fff; }
.brand-text { color: var(--color-text); }
.brand-h { color: var(--color-secondary); text-shadow: 0 0 12px rgba(53,224,255,0.8); }
.main-nav { display: flex; align-items: center; gap: 34px; margin-left: 52px; }
.nav-link {
  position: relative;
  font-size: 0.95rem;
  color: var(--color-text);
  padding: 24px 6px 20px;
  transition: color 0.24s ease;
  letter-spacing: 0.02em;
}
.nav-link:hover { color: var(--color-secondary); }
.nav-link.active {
  color: var(--color-secondary);
  text-shadow: 0 0 8px rgba(53,224,255,0.8);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 16px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-secondary), transparent);
  box-shadow: 0 0 12px rgba(53,224,255,0.8);
  border-radius: 2px;
}
.header-cta { margin-left: auto; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; width: 42px; height: 42px; align-items: center; justify-content: center; border: 1px solid var(--color-border); border-radius: var(--radius-s); }
.menu-toggle span { display: block; width: 20px; height: 2px; background: var(--color-text); transition: transform 0.24s ease, opacity 0.24s ease; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  line-height: 1;
  padding: 0 22px;
  height: 46px;
  border-radius: var(--radius-s);
  transition: all 0.18s ease-out;
  cursor: pointer;
  white-space: nowrap;
}
.btn-lg { height: 54px; padding: 0 30px; font-size: 1.02rem; }
.btn-sm { height: 38px; padding: 0 18px; font-size: 0.88rem; }
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(23,107,255,0.35);
}
.btn-primary:hover {
  box-shadow: 0 0 32px rgba(53,224,255,0.6);
  filter: brightness(1.12);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); filter: brightness(1); }
.btn-ghost {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(53,224,255,0.35);
  color: var(--color-text);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { background: rgba(53,224,255,0.1); border-color: var(--color-secondary); box-shadow: var(--shadow-glow); transform: translateY(-1px); }
.btn-ghost:active { transform: translateY(0); }
.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn-outline:hover { border-color: var(--color-secondary); color: var(--color-secondary); box-shadow: var(--shadow-glow); }
.btn-block { width: 100%; }

/* Section head */
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-tag {
  display: inline-flex; align-items: center;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--color-secondary);
  background: rgba(53,224,255,0.08);
  border: 1px solid rgba(53,224,255,0.25);
  padding: 5px 14px;
  border-radius: 999px;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.section-head h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); font-weight: 700; line-height: 1.3; letter-spacing: -0.01em; }
.section-sub { color: var(--color-text-secondary); font-size: 1.02rem; margin-top: 14px; line-height: 1.8; }

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8,11,20,0.55) 0%, rgba(8,11,20,0.82) 60%, var(--color-bg) 100%);
  z-index: 1;
}
.hero-inner { position: relative; z-index: 2; text-align: center; padding: 140px 0 100px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid rgba(53,224,255,0.3);
  background: rgba(8,12,24,0.6);
  backdrop-filter: blur(8px);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}
.dot-pulse {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 10px rgba(46,230,160,0.8);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}
.hero-title {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  max-width: 900px;
  margin: 0 auto 24px;
  text-shadow: 0 2px 30px rgba(0,0,0,0.6);
}
.text-gradient {
  background: linear-gradient(90deg, var(--color-secondary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-top: 80px;
  flex-wrap: wrap;
}
.stat-block { text-align: center; }
.stat-num {
  display: block;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-text);
  text-shadow: 0 0 20px rgba(53,224,255,0.5);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.stat-label { display: block; font-size: 0.9rem; color: var(--color-text-muted); margin-top: 6px; }
.stat-divider { width: 1px; height: 46px; background: linear-gradient(180deg, transparent, rgba(53,224,255,0.4), transparent); }

/* Features */
.features { background: var(--color-bg); }
.features-layout { display: grid; grid-template-columns: 240px 1fr; gap: 60px; }
.features-index { position: sticky; top: 100px; align-self: start; display: flex; flex-direction: column; gap: 8px; }
.feature-index-link {
  padding: 14px 18px;
  border-radius: var(--radius-m);
  font-size: 0.98rem;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  transition: all 0.2s ease;
  line-height: 1.5;
}
.feature-index-link:hover { color: var(--color-secondary); background: rgba(53,224,255,0.05); }
.feature-index-link.active {
  color: var(--color-secondary);
  background: rgba(53,224,255,0.08);
  border-color: rgba(53,224,255,0.3);
  text-shadow: 0 0 10px rgba(53,224,255,0.5);
}
.features-content { display: flex; flex-direction: column; gap: 48px; }
.feature-item {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 40px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.feature-item:hover { border-color: rgba(53,224,255,0.3); box-shadow: 0 0 40px rgba(23,107,255,0.1); }
.feature-num {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--color-secondary);
  border: 1px solid rgba(53,224,255,0.3);
  padding: 4px 12px;
  border-radius: 999px;
  display: inline-block;
  margin-bottom: 16px;
  background: rgba(53,224,255,0.06);
}
.feature-info h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 12px; line-height: 1.4; }
.feature-info p { color: var(--color-text-secondary); line-height: 1.85; margin-bottom: 18px; }
.feature-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.feature-list li { position: relative; padding-left: 26px; color: var(--color-text); font-size: 0.95rem; line-height: 1.6; }
.feature-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 9px;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  box-shadow: 0 0 8px rgba(53,224,255,0.5);
}
.feature-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  object-fit: cover;
}

/* Showcase */
.showcase { background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-soft) 100%); }
.showcase-window {
  background: #0A0F1E;
  border: 1px solid rgba(53,224,255,0.25);
  border-radius: var(--radius-l);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 40px rgba(23,107,255,0.08);
  overflow: hidden;
  max-width: 980px;
  margin: 0 auto;
}
.window-bar {
  display: flex; align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--color-border);
}
.window-dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-red { background: #FF5F57; }
.dot-yellow { background: #FEBC2E; }
.dot-green { background: #28C840; }
.window-title { margin-left: 12px; font-size: 0.85rem; color: var(--color-text-secondary); letter-spacing: 0.02em; }
.window-status { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; font-size: 0.82rem; color: var(--color-success); }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-success); box-shadow: 0 0 8px rgba(46,230,160,0.8); }
.window-body { display: grid; grid-template-columns: 120px 1fr; gap: 0; min-height: 420px; }
.window-sidebar { background: rgba(255,255,255,0.02); border-right: 1px solid var(--color-border); padding: 20px 14px; display: flex; flex-direction: column; gap: 12px; }
.sidebar-item { height: 34px; border-radius: 8px; background: rgba(255,255,255,0.03); border: 1px solid var(--color-border); }
.sidebar-item.active { background: rgba(53,224,255,0.12); border-color: rgba(53,224,255,0.4); box-shadow: 0 0 12px rgba(53,224,255,0.15); }
.window-main { padding: 28px; display: flex; flex-direction: column; gap: 24px; }
.metric-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.metric-card { height: 70px; border-radius: var(--radius-m); background: rgba(255,255,255,0.03); border: 1px solid var(--color-border); position: relative; overflow: hidden; }
.metric-card::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: 0; height: 40%;
  background: linear-gradient(90deg, rgba(23,107,255,0.2), rgba(122,92,255,0.2));
}
.chart-panel { height: 180px; border-radius: var(--radius-m); background: rgba(255,255,255,0.02); border: 1px solid var(--color-border); display: flex; align-items: flex-end; padding: 18px; gap: 14px; }
.chart-bars { display: flex; align-items: flex-end; gap: 14px; height: 100%; width: 100%; }
.bar { flex: 1; background: linear-gradient(180deg, var(--color-secondary) 0%, var(--color-primary) 100%); border-radius: 4px 4px 0 0; opacity: 0.8; min-height: 20px; box-shadow: 0 0 12px rgba(53,224,255,0.2); }
.data-table { display: flex; flex-direction: column; gap: 10px; }
.table-row { height: 26px; border-radius: 6px; background: rgba(255,255,255,0.03); border: 1px solid var(--color-border); }
.table-row.head { background: rgba(53,224,255,0.08); border-color: rgba(53,224,255,0.2); }
.showcase-dots { display: flex; gap: 10px; justify-content: center; margin-top: 32px; }
.showcase-dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.2); transition: all 0.2s ease; }
.showcase-dot.active { background: var(--color-secondary); box-shadow: 0 0 10px rgba(53,224,255,0.7); }

/* Evidence */
.evidence {
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  position: relative;
}
.evidence::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(8,11,20,0.88) 50%, var(--color-bg) 100%);
}
.evidence .container { position: relative; z-index: 2; }
.timeline { position: relative; max-width: 800px; margin: 0 auto; padding: 20px 0; }
.timeline::before {
  content: '';
  position: absolute;
  left: 18px; top: 20px; bottom: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-secondary), var(--color-accent), transparent);
  opacity: 0.6;
}
.timeline-item { position: relative; padding-left: 60px; margin-bottom: 40px; }
.timeline-marker {
  position: absolute;
  left: 8px; top: 8px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-secondary);
  box-shadow: 0 0 14px rgba(53,224,255,0.7);
}
.timeline-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: 24px 28px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.timeline-card:hover { border-color: rgba(53,224,255,0.35); box-shadow: 0 0 30px rgba(23,107,255,0.12); }
.timeline-date { font-size: 0.82rem; color: var(--color-secondary); letter-spacing: 0.08em; display: inline-block; margin-bottom: 8px; }
.timeline-card h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 8px; line-height: 1.5; }
.timeline-card p { color: var(--color-text-secondary); font-size: 0.95rem; line-height: 1.75; }
.evidence-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 56px;
  padding: 36px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  backdrop-filter: blur(10px);
}
.evidence-metric { text-align: center; }
.evidence-metric strong { display: block; font-size: 2rem; font-weight: 700; color: var(--color-text); text-shadow: 0 0 18px rgba(53,224,255,0.4); }
.evidence-metric span { display: block; margin-top: 6px; color: var(--color-text-muted); font-size: 0.9rem; }

/* Pricing */
.pricing { background: var(--color-bg); }
.pricing-grid { display: grid; grid-template-columns: 1fr 1.12fr 1fr; gap: 24px; align-items: stretch; }
.price-card {
  position: relative;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-card);
}
.price-card:hover { border-color: var(--color-border-hover); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.45), 0 0 30px rgba(23,107,255,0.1); }
.price-card.recommended {
  background: linear-gradient(180deg, rgba(23,107,255,0.1) 0%, rgba(122,92,255,0.05) 100%);
  border-color: rgba(53,224,255,0.4);
  box-shadow: 0 0 40px rgba(23,107,255,0.15);
  transform: scale(1.02);
}
.price-card.recommended:hover { transform: scale(1.02) translateY(-4px); }
.badge-recommend {
  position: absolute;
  top: -14px; left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 18px;
  border-radius: 999px;
  letter-spacing: 0.06em;
  box-shadow: 0 4px 18px rgba(23,107,255,0.5);
  white-space: nowrap;
}
.price-card h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 12px; }
.price-amount { font-size: 2.4rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 10px; }
.price-amount span { font-size: 1rem; font-weight: 400; color: var(--color-text-muted); margin-left: 4px; }
.price-desc { color: var(--color-text-secondary); font-size: 0.92rem; line-height: 1.7; margin-bottom: 24px; min-height: 52px; }
.price-features { list-style: none; margin-bottom: 30px; display: flex; flex-direction: column; gap: 10px; }
.price-features li { position: relative; padding-left: 26px; font-size: 0.93rem; line-height: 1.6; color: var(--color-text); }
.price-features li::before {
  content: '';
  position: absolute;
  left: 0; top: 9px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-secondary);
  box-shadow: 0 0 8px rgba(53,224,255,0.6);
}
.price-card .btn { margin-top: auto; }

/* FAQ */
.faq { background: var(--color-bg-soft); }
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.faq-item.open { background: rgba(255,255,255,0.06); border-left: 3px solid var(--color-secondary); }
.faq-question {
  width: 100%;
  display: flex; align-items: center;
  gap: 14px;
  padding: 20px 24px;
  font-size: 1.02rem;
  font-weight: 600;
  text-align: left;
  color: var(--color-text);
  transition: color 0.2s ease;
}
.faq-question:hover { color: var(--color-secondary); }
.faq-icon {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: rgba(53,224,255,0.1);
  border: 1px solid rgba(53,224,255,0.3);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  color: var(--color-secondary);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  line-height: 1;
}
.faq-item.open .faq-icon { transform: rotate(45deg); box-shadow: 0 0 12px rgba(53,224,255,0.4); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.open .faq-answer { max-height: 400px; }
.faq-answer p { padding: 0 24px 22px 66px; color: var(--color-text-secondary); font-size: 0.98rem; line-height: 1.85; }

/* News */
.news { background: var(--color-bg); }
.news-list { display: flex; flex-direction: column; gap: 16px; max-width: 1000px; margin: 0 auto; }
.news-card {
  display: flex; align-items: center;
  gap: 28px;
  padding: 24px 28px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  position: relative;
  transition: all 0.2s ease;
}
.news-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(53,224,255,0.3);
  box-shadow: 0 0 30px rgba(23,107,255,0.1);
  transform: translateY(-2px);
}
.news-card::before {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--color-secondary);
  box-shadow: 0 0 14px rgba(53,224,255,0.6);
  opacity: 0;
  transition: opacity 0.2s ease;
}
.news-card:hover::before { opacity: 1; }
.news-date {
  min-width: 80px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.news-content { flex: 1; min-width: 0; }
.news-title {
  font-size: 1.06rem;
  font-weight: 600;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 6px;
  transition: color 0.2s ease;
}
.news-card:hover .news-title { color: var(--color-secondary); }
.news-summary {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.7;
}
.news-cat {
  flex-shrink: 0;
  font-size: 0.82rem;
  color: var(--color-secondary);
  border: 1px solid rgba(53,224,255,0.3);
  padding: 4px 14px;
  border-radius: 999px;
  background: rgba(53,224,255,0.06);
  white-space: nowrap;
}
.news-empty {
  border: 1px dashed rgba(255,255,255,0.2);
  border-radius: var(--radius-m);
  padding: 60px 24px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.98rem;
}

/* CTA */
.cta-section { background: var(--color-bg); padding-top: 40px; }
.cta-card {
  background: linear-gradient(180deg, var(--color-bg-soft) 0%, #0A0E1A 100%);
  border: 1px solid rgba(53,224,255,0.25);
  border-radius: var(--radius-l);
  padding: 72px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-card::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 260px; height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53,224,255,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.cta-card::after {
  content: '';
  position: absolute;
  bottom: -120px; left: -120px;
  width: 300px; height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(122,92,255,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.cta-card h2 { position: relative; z-index: 2; font-size: clamp(1.8rem, 3.4vw, 2.6rem); font-weight: 700; letter-spacing: -0.01em; margin-bottom: 16px; }
.cta-card p { position: relative; z-index: 2; color: var(--color-text-secondary); font-size: 1.05rem; max-width: 560px; margin: 0 auto 36px; }
.cta-actions { position: relative; z-index: 2; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Footer */
.site-footer {
  background: #070A13;
  border-top: 1px solid rgba(53,224,255,0.25);
  padding: 72px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 56px;
}
.footer-brand { font-size: 1.2rem; margin-bottom: 14px; display: inline-flex; }
.footer-brand-col p { color: var(--color-text-muted); font-size: 0.92rem; line-height: 1.8; max-width: 260px; }
.footer-col h4 {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  text-transform: uppercase;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 28px; height: 2px;
  background: linear-gradient(90deg, var(--color-secondary), transparent);
  box-shadow: 0 0 8px rgba(53,224,255,0.4);
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li { color: var(--color-text-muted); font-size: 0.9rem; line-height: 1.6; }
.footer-col ul a { color: var(--color-text-secondary); transition: color 0.2s ease; }
.footer-col ul a:hover { color: var(--color-secondary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { color: var(--color-text-muted); font-size: 0.85rem; }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(4,6,12,0.72);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.modal-overlay.open { opacity: 1; visibility: visible; }
.modal-card {
  background: #0D1220;
  border: 1px solid rgba(53,224,255,0.3);
  border-radius: var(--radius-l);
  padding: 40px;
  max-width: 520px;
  width: 100%;
  max-height: 92vh;
  overflow-y: auto;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6), 0 0 50px rgba(23,107,255,0.15);
  position: relative;
  transform: translateY(16px);
  transition: transform 0.25s ease;
}
.modal-overlay.open .modal-card { transform: translateY(0); }
.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: rgba(255,255,255,0.04);
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s ease;
  line-height: 1;
}
.modal-close:hover { color: var(--color-secondary); border-color: rgba(53,224,255,0.4); }
.modal-head { margin-bottom: 24px; }
.modal-head h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; }
.modal-head p { color: var(--color-text-secondary); font-size: 0.94rem; line-height: 1.7; }
.modal-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.82rem; color: var(--color-text-muted); letter-spacing: 0.04em; }
.form-group input, .form-group select, .form-group textarea {
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-s);
  padding: 12px 14px;
  font-size: 16px;
  color: var(--color-text);
  line-height: 1.5;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(53,224,255,0.15);
  outline: none;
}
.form-group select { appearance: none; }
.form-group textarea { resize: vertical; }
.form-tip { font-size: 0.82rem; color: var(--color-text-muted); text-align: center; line-height: 1.6; }
.form-success { text-align: center; padding: 20px 0; }
.success-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: rgba(46,230,160,0.12);
  border: 2px solid var(--color-success);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  color: var(--color-success);
  margin: 0 auto 20px;
  box-shadow: 0 0 20px rgba(46,230,160,0.3);
}
.form-success h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.form-success p { color: var(--color-text-secondary); margin-bottom: 24px; }

/* Float CTA */
.float-cta {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: 0 4px 24px rgba(23,107,255,0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.25s ease;
}
.float-cta.show { opacity: 1; visibility: visible; transform: translateY(0); }
.float-cta:hover { box-shadow: 0 0 36px rgba(53,224,255,0.6); transform: translateY(-2px); }
.float-cta-pulse {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 10px rgba(46,230,160,0.9);
  animation: pulse 2s infinite;
}

/* Responsive */
@media (max-width: 1024px) {
  .features-layout { grid-template-columns: 1fr; gap: 32px; }
  .features-index { position: static; flex-direction: row; flex-wrap: wrap; }
  .feature-index-link { padding: 10px 16px; font-size: 0.9rem; }
  .pricing-grid { grid-template-columns: 1fr 1fr; }
  .price-card.recommended { transform: none; }
  .price-card.recommended:hover { transform: translateY(-4px); }
  .evidence-panel { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .section-pad { padding: 64px 0; }
  .menu-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: rgba(10,14,26,0.96);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 12px 24px 20px;
    border-bottom: 1px solid rgba(53,224,255,0.25);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }
  .main-nav.open { transform: translateY(0); }
  .nav-link { padding: 15px 4px; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .nav-link.active::after { bottom: 8px; }
  .header-cta { display: none; }
  .hero-title { font-size: clamp(2.2rem, 8vw, 3rem); }
  .hero-sub { font-size: 1rem; }
  .hero-stats { gap: 24px; margin-top: 56px; }
  .stat-divider { height: 36px; }
  .feature-item { grid-template-columns: 1fr; padding: 28px; }
  .feature-img { order: -1; }
  .showcase-window { border-radius: var(--radius-m); }
  .window-body { grid-template-columns: 1fr; min-height: auto; }
  .window-sidebar { display: none; }
  .timeline-item { padding-left: 48px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
  .evidence-panel { padding: 24px; gap: 16px; }
  .news-card { flex-direction: column; align-items: flex-start; gap: 12px; padding: 20px; }
  .news-date { min-width: auto; text-align: left; }
  .news-cat { align-self: flex-start; }
  .cta-card { padding: 48px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .modal-card { padding: 28px 24px; }
}
@media (max-width: 520px) {
  .hero-inner { padding: 120px 0 80px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .feature-item { padding: 24px; gap: 24px; }
  .metric-row { grid-template-columns: 1fr; }
  .chart-panel { height: 140px; }
  .timeline::before { left: 12px; }
  .timeline-marker { left: 3px; width: 18px; height: 18px; }
  .timeline-item { padding-left: 40px; }
  .evidence-panel { grid-template-columns: 1fr; }
  .faq-question { padding: 16px 18px; font-size: 0.96rem; }
  .faq-answer p { padding: 0 18px 18px 48px; }
  .float-cta { right: 16px; bottom: 16px; padding: 12px 18px; }
}

/* roulang page: category1 */
:root {
    --bg-primary: #080B14;
    --bg-secondary: #0D1220;
    --bg-card: rgba(255, 255, 255, 0.045);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --border-card: rgba(255, 255, 255, 0.08);
    --border-neon: rgba(53, 224, 255, 0.4);
    --text-primary: #E6EDF7;
    --text-secondary: #94A3B8;
    --text-muted: #5B6B85;
    --primary: #176BFF;
    --secondary: #35E0FF;
    --accent: #7A5CFF;
    --success: #2EE6A0;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.35);
    --shadow-cta: 0 0 20px rgba(53, 224, 255, 0.35);
    --shadow-cta-hover: 0 0 32px rgba(53, 224, 255, 0.6);
    --transition: 200ms ease-out;
    --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.8;
    letter-spacing: 0.01em;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  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;
  }

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

  /* Header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 72px;
    background: rgba(8, 12, 24, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(53, 224, 255, 0.25);
  }

  .header-inner {
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }

  .brand {
    display: flex;
    align-items: center;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    color: var(--text-primary);
    white-space: nowrap;
  }

  .brand-h {
    color: var(--secondary);
    text-shadow: 0 0 12px rgba(53, 224, 255, 0.6);
    margin-right: 2px;
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
  }

  .nav-link {
    position: relative;
    padding: 10px 18px;
    font-size: 0.95rem;
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
    white-space: nowrap;
  }

  .nav-link:hover {
    color: var(--secondary);
    background: rgba(53, 224, 255, 0.04);
    box-shadow: 0 4px 0 -2px rgba(53, 224, 255, 0.7);
  }

  .nav-link.active {
    color: var(--secondary);
    text-shadow: 0 0 8px rgba(53, 224, 255, 0.7);
    background: rgba(53, 224, 255, 0.06);
    box-shadow: 0 4px 0 -2px rgba(53, 224, 255, 0.85);
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    box-shadow: var(--shadow-cta);
    transition: box-shadow var(--transition), transform var(--transition), filter var(--transition);
    white-space: nowrap;
  }

  .btn-primary:hover {
    box-shadow: var(--shadow-cta-hover);
    filter: brightness(1.08);
    transform: translateY(-1px);
  }

  .btn-primary:active {
    transform: translateY(0);
  }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(53, 224, 255, 0.35);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.3px;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition), transform var(--transition);
    white-space: nowrap;
  }

  .btn-outline:hover {
    border-color: var(--secondary);
    box-shadow: 0 0 20px rgba(53, 224, 255, 0.2);
    background: rgba(53, 224, 255, 0.06);
    color: var(--secondary);
    transform: translateY(-1px);
  }

  .menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    border-radius: var(--radius-sm);
  }

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

  /* Page Hero */
  .page-hero {
    position: relative;
    min-height: 300px;
    display: flex;
    align-items: center;
    padding: 140px 0 80px;
    background-image:
      linear-gradient(rgba(53, 224, 255, 0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(53, 224, 255, 0.04) 1px, transparent 1px),
      linear-gradient(180deg, rgba(8, 11, 20, 0.15) 0%, rgba(8, 11, 20, 0.88) 100%),
      url('/assets/images/backpic/back-1.webp');
    background-size: 44px 44px, 44px 44px, 100% 100%, cover;
    background-position: center;
    border-bottom: 1px solid rgba(53, 224, 255, 0.12);
  }

  .page-hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(180deg, transparent 0%, var(--bg-primary) 100%);
    pointer-events: none;
  }

  .page-hero-content {
    position: relative;
    z-index: 2;
    max-width: 760px;
  }

  .page-hero h1 {
    font-size: clamp(2.2rem, 4.5vw, 3.2rem);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-bottom: 18px;
    background: linear-gradient(135deg, #E6EDF7 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .page-hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 640px;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 999px;
    border: 1px solid rgba(53, 224, 255, 0.35);
    background: rgba(53, 224, 255, 0.06);
    color: var(--secondary);
    font-size: 0.875rem;
    margin-bottom: 24px;
    letter-spacing: 0.02em;
  }

  .hero-badge .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 8px rgba(46, 230, 160, 0.6);
  }

  /* Layout */
  .section-block {
    padding: 80px 0;
  }

  .section-block + .section-block {
    border-top: 1px solid rgba(255, 255, 255, 0.04);
  }

  .section-heading {
    margin-bottom: 48px;
  }

  .section-heading h2 {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-bottom: 12px;
    position: relative;
    padding-bottom: 16px;
  }

  .section-heading h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 56px;
    height: 2px;
    background: linear-gradient(90deg, var(--secondary), transparent);
    box-shadow: 0 0 8px rgba(53, 224, 255, 0.5);
  }

  .section-heading p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 720px;
    line-height: 1.8;
  }

  /* Sidebar */
  .sidebar-nav {
    position: relative;
  }

  .sidebar-inner {
    position: sticky;
    top: 100px;
    padding: 20px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-card);
  }

  .sidebar-inner h3 {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .sidebar-inner .side-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--text-secondary);
    border: 1px solid transparent;
    transition: all var(--transition);
    margin-bottom: 4px;
  }

  .sidebar-inner .side-link::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition), box-shadow var(--transition);
    flex-shrink: 0;
  }

  .sidebar-inner .side-link:hover {
    color: var(--secondary);
    background: rgba(53, 224, 255, 0.05);
    border-color: rgba(53, 224, 255, 0.15);
  }

  .sidebar-inner .side-link:hover::before {
    background: var(--secondary);
    box-shadow: 0 0 8px rgba(53, 224, 255, 0.6);
  }

  /* Service Cards */
  .service-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .service-card {
    padding: 28px;
    border-radius: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    box-shadow: var(--shadow-card);
    transition: transform var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
  }

  .service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 0;
    background: linear-gradient(180deg, var(--secondary), var(--primary));
    transition: height 300ms ease-out;
  }

  .service-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-neon);
    background: var(--bg-card-hover);
    box-shadow: 0 0 40px rgba(23, 107, 255, 0.12);
  }

  .service-card:hover::before {
    height: 100%;
  }

  .service-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(53, 224, 255, 0.08);
    border: 1px solid rgba(53, 224, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--secondary);
  }

  .service-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.4;
  }

  .service-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
  }

  /* Scenario cards */
  .scenario-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .scenario-item {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 28px;
    border-radius: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    transition: all var(--transition);
  }

  .scenario-item:hover {
    border-color: var(--border-neon);
    background: var(--bg-card-hover);
    transform: translateX(4px);
  }

  .scenario-num {
    font-size: 2.4rem;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 60px;
  }

  .scenario-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
  }

  .scenario-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
  }

  /* Process Timeline */
  .process-timeline {
    position: relative;
    padding-left: 32px;
  }

  .process-timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(180deg, var(--secondary) 0%, rgba(53, 224, 255, 0.1) 100%);
  }

  .process-item {
    position: relative;
    padding: 16px 0 32px 24px;
  }

  .process-item:last-child {
    padding-bottom: 0;
  }

  .process-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 26px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--secondary);
    box-shadow: 0 0 12px rgba(53, 224, 255, 0.5);
  }

  .process-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
  }

  .process-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
  }

  .process-tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 999px;
    border: 1px solid rgba(53, 224, 255, 0.3);
    color: var(--secondary);
    background: rgba(53, 224, 255, 0.04);
    margin-bottom: 8px;
    letter-spacing: 0.05em;
  }

  /* FAQ */
  .faq-wrap {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .faq-item {
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-card);
    overflow: hidden;
    transition: border-color var(--transition), background var(--transition);
  }

  .faq-item.open {
    border-color: rgba(53, 224, 255, 0.4);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 30px rgba(23, 107, 255, 0.06);
  }

  .faq-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    text-align: left;
    color: var(--text-primary);
    font-size: 1.02rem;
    font-weight: 500;
    transition: color var(--transition);
  }

  .faq-btn:hover {
    color: var(--secondary);
  }

  .faq-icon {
    position: relative;
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    border-radius: 6px;
    border: 1px solid rgba(53, 224, 255, 0.3);
    background: rgba(53, 224, 255, 0.04);
    transition: transform var(--transition), border-color var(--transition);
  }

  .faq-icon::before,
  .faq-icon::after {
    content: '';
    position: absolute;
    background: var(--secondary);
    border-radius: 2px;
    transition: transform var(--transition);
  }

  .faq-icon::before {
    width: 12px;
    height: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }

  .faq-icon::after {
    width: 2px;
    height: 12px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }

  .faq-item.open .faq-icon {
    border-color: rgba(53, 224, 255, 0.6);
  }

  .faq-item.open .faq-icon::after {
    transform: translate(-50%, -50%) rotate(90deg);
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 280ms ease-out;
  }

  .faq-answer-inner {
    padding: 0 24px 24px;
    color: var(--text-secondary);
    font-size: 0.96rem;
    line-height: 1.8;
    border-left: 2px solid var(--secondary);
    margin-left: 24px;
    padding-left: 16px;
  }

  /* CTA */
  .cta-section {
    position: relative;
    padding: 100px 0;
    background:
      linear-gradient(180deg, var(--bg-primary) 0%, rgba(13, 18, 32, 0.6) 40%, rgba(13, 18, 32, 0.9) 100%),
      url('/assets/images/backpic/back-2.png');
    background-size: cover;
    background-position: center;
    border-top: 1px solid rgba(53, 224, 255, 0.08);
    overflow: hidden;
  }

  .cta-inner {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
  }

  .cta-inner h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 18px;
    background: linear-gradient(135deg, #E6EDF7 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .cta-inner p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 36px;
    line-height: 1.8;
  }

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

  /* Footer */
  .site-footer {
    background: #060911;
    border-top: 1px solid rgba(53, 224, 255, 0.15);
    padding: 60px 0 0;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  .footer-brand-col p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-top: 16px;
    max-width: 320px;
  }

  .site-footer h4 {
    font-size: 0.85rem;
    color: var(--text-primary);
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    padding-bottom: 10px;
    position: relative;
  }

  .site-footer h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 1px;
    background: var(--secondary);
    box-shadow: 0 0 8px rgba(53, 224, 255, 0.5);
  }

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

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

  .site-footer ul a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition), padding-left var(--transition);
  }

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

  .footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 24px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
  }

  /* Float CTA */
  .float-cta {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 90;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: 0 0 20px rgba(53, 224, 255, 0.35);
    opacity: 0;
    transform: translateY(20px);
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition), visibility var(--transition);
  }

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

  .float-cta:hover {
    box-shadow: 0 0 32px rgba(53, 224, 255, 0.6);
    transform: translateY(-2px);
  }

  .float-cta .pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 0 0 rgba(46, 230, 160, 0.6);
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(46, 230, 160, 0.5); }
    70% { box-shadow: 0 0 0 10px rgba(46, 230, 160, 0); }
    100% { box-shadow: 0 0 0 0 rgba(46, 230, 160, 0); }
  }

  /* Reveal Animation */
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 500ms ease-out, transform 500ms ease-out;
  }

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

  /* Focus */
  a:focus-visible,
  button:focus-visible {
    outline: 2px solid rgba(53, 224, 255, 0.5);
    outline-offset: 2px;
  }

  /* Responsive */
  @media (max-width: 1024px) {
    .footer-grid {
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

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

  @media (max-width: 768px) {
    .header-inner {
      gap: 12px;
    }

    .main-nav {
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      background: rgba(8, 12, 24, 0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: stretch;
      padding: 16px 24px;
      border-bottom: 1px solid rgba(53, 224, 255, 0.2);
      gap: 4px;
      display: none;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    }

    .main-nav.open {
      display: flex;
    }

    .nav-link {
      padding: 14px 16px;
      border-radius: var(--radius-sm);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }

    .nav-link.active {
      background: rgba(53, 224, 255, 0.08);
    }

    .btn-header {
      display: none;
    }

    .menu-toggle {
      display: flex;
    }

    .page-hero {
      padding: 120px 0 60px;
      min-height: 280px;
    }

    .section-block {
      padding: 56px 0;
    }

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

    .scenario-item {
      flex-direction: column;
      gap: 12px;
    }

    .cta-section {
      padding: 72px 0;
    }

    .float-cta {
      bottom: 20px;
      right: 20px;
      padding: 10px 20px;
    }
  }

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

    .brand {
      font-size: 1.15rem;
    }

    .page-hero h1 {
      font-size: 2rem;
    }

    .page-hero p {
      font-size: 1rem;
    }

    .section-heading h2 {
      font-size: 1.6rem;
    }

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

    .cta-btns {
      flex-direction: column;
      width: 100%;
    }

    .cta-btns .btn-primary,
    .cta-btns .btn-outline {
      width: 100%;
    }
  }

/* roulang page: article */
:root {
  --bg-body: #080B14;
  --bg-panel: #0D1220;
  --bg-card: rgba(255,255,255,0.045);
  --border-card: rgba(255,255,255,0.08);
  --primary: #176BFF;
  --secondary: #35E0FF;
  --accent: #7A5CFF;
  --success: #2EE6A0;
  --text-main: #E6EDF7;
  --text-sub: #94A3B8;
  --text-weak: #5B6B85;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --shadow-card: 0 8px 30px rgba(0,0,0,0.35);
  --transition: 200ms ease-out;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  background: var(--bg-body);
  color: var(--text-main);
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
a:focus-visible, button:focus-visible {
  outline: 2px solid rgba(53,224,255,0.5);
  outline-offset: 2px;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 840px; margin: 0 auto; padding: 0 24px; }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8,12,24,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(53,224,255,0.3);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.brand-h {
  color: var(--secondary);
  text-shadow: 0 0 12px rgba(53,224,255,0.8);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  position: relative;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}
.nav-link:hover {
  color: var(--secondary);
  box-shadow: 0 4px 0 -2px rgba(53,224,255,0.8);
}
.nav-link.active {
  color: var(--secondary);
  background: rgba(53,224,255,0.06);
  text-shadow: 0 0 8px rgba(53,224,255,0.8);
  box-shadow: 0 4px 0 -2px rgba(53,224,255,0.8);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.btn-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: var(--radius-sm);
  box-shadow: 0 0 20px rgba(53,224,255,0.35);
  transition: box-shadow var(--transition), transform var(--transition);
  letter-spacing: 0.3px;
}
.btn-nav:hover {
  box-shadow: 0 0 32px rgba(53,224,255,0.6);
  transform: translateY(-1px);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all 240ms ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 28px;
}
.breadcrumb a { color: var(--text-sub); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--secondary); }
.breadcrumb-sep { color: var(--text-weak); }
.breadcrumb-current {
  color: var(--secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 340px;
}

/* ===== 文章头部 ===== */
.article-hero {
  padding: 56px 0 36px;
  background:
    radial-gradient(1200px 400px at 20% 0%, rgba(23,107,255,0.14), transparent 60%),
    linear-gradient(rgba(8,11,20,0.88), rgba(8,11,20,0.96)),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom: 1px solid rgba(53,224,255,0.12);
}
.article-header { max-width: 840px; margin: 0 auto; }
.category-badge {
  display: inline-block;
  padding: 5px 18px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--secondary);
  border: 1px solid rgba(53,224,255,0.4);
  border-radius: 999px;
  box-shadow: 0 0 14px rgba(53,224,255,0.18);
  margin-bottom: 18px;
}
.article-title {
  font-size: clamp(1.9rem, 4.4vw, 2.7rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
  color: #F0F5FF;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  font-size: 0.9rem;
  color: var(--text-sub);
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.meta-item svg {
  width: 16px;
  height: 16px;
  stroke: var(--text-weak);
  fill: none;
  stroke-width: 1.8;
}

/* ===== 正文区 ===== */
.article-main {
  padding: 52px 0 20px;
  background: var(--bg-body);
}
.article-content {
  max-width: 840px;
  margin: 0 auto;
  color: rgba(230,237,247,0.9);
  font-size: 1.0625rem;
  line-height: 1.9;
}
.article-content > * + * { margin-top: 1.4em; }
.article-content h2 {
  font-size: 1.8rem;
  font-weight: 650;
  line-height: 1.4;
  margin-top: 2.2em;
  margin-bottom: 0.7em;
  border-left: 4px solid var(--secondary);
  padding-left: 16px;
  color: #E8EEFB;
}
.article-content h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  color: #E8EEFB;
}
.article-content p {
  margin-bottom: 1.3em;
  line-height: 1.95;
}
.article-content a {
  color: var(--secondary);
  border-bottom: 1px solid rgba(53,224,255,0.35);
  transition: border-color var(--transition);
}
.article-content a:hover { border-bottom-color: var(--secondary); }
.article-content ul,
.article-content ol {
  padding-left: 1.5em;
  margin-bottom: 1.3em;
}
.article-content li {
  margin-bottom: 0.5em;
  line-height: 1.75;
}
.article-content li::marker { color: var(--secondary); }
.article-content blockquote {
  border-left: 4px solid var(--secondary);
  background: rgba(53,224,255,0.05);
  padding: 18px 22px;
  border-radius: 0 12px 12px 0;
  margin: 1.8em 0;
  color: var(--text-sub);
  font-style: normal;
}
.article-content table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-card);
  margin: 1.8em 0;
}
.article-content th {
  background: rgba(23,107,255,0.18);
  color: var(--text-main);
  padding: 13px 18px;
  text-align: left;
  font-weight: 600;
  font-size: 0.95rem;
}
.article-content td {
  padding: 13px 18px;
  border-top: 1px solid var(--border-card);
  background: rgba(255,255,255,0.02);
  font-size: 0.95rem;
}
.article-content tr:nth-child(even) td {
  background: rgba(255,255,255,0.04);
}
.article-content code {
  background: rgba(53,224,255,0.1);
  color: var(--secondary);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.9em;
}
.article-content pre {
  background: var(--bg-panel);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  padding: 22px;
  overflow-x: auto;
  margin: 1.8em 0;
  box-shadow: var(--shadow-card);
}
.article-content pre code {
  background: none;
  padding: 0;
  color: #C8D6EA;
}
.article-content hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(53,224,255,0.4), transparent);
  margin: 2.4em 0;
}

/* ===== 空态 ===== */
.article-empty {
  max-width: 840px;
  margin: 60px auto;
  text-align: center;
  padding: 60px 30px;
  border: 2px dashed rgba(53,224,255,0.2);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.02);
}
.article-empty p {
  font-size: 1.15rem;
  color: var(--text-sub);
  margin-bottom: 20px;
}
.btn-back {
  display: inline-flex;
  align-items: center;
  padding: 10px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-sm);
  box-shadow: 0 0 20px rgba(53,224,255,0.3);
  transition: all var(--transition);
}
.btn-back:hover {
  box-shadow: 0 0 32px rgba(53,224,255,0.55);
  transform: translateY(-1px);
}

/* ===== 相关推荐 ===== */
.article-related {
  padding: 56px 0 16px;
  background: var(--bg-body);
}
.article-related .section-title {
  font-size: 1.7rem;
  font-weight: 700;
  margin-bottom: 34px;
  text-align: center;
  color: #E8EEFB;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 840px;
  margin: 0 auto;
}
.related-card {
  display: flex;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: all var(--transition);
  overflow: hidden;
  position: relative;
}
.related-card:hover {
  border-color: rgba(53,224,255,0.4);
  background: rgba(255,255,255,0.06);
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(23,107,255,0.12);
}
.related-thumb {
  width: 96px;
  height: 72px;
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-panel);
  border: 1px solid var(--border-card);
}
.related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.related-body {
  min-width: 0;
  flex: 1;
}
.related-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 6px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.related-excerpt {
  font-size: 0.88rem;
  color: var(--text-sub);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-height: 1.6;
}
.related-empty {
  border: 2px dashed rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-weak);
  font-size: 0.9rem;
}
.article-back-links {
  max-width: 840px;
  margin: 30px auto 0;
  display: flex;
  gap: 20px;
  justify-content: center;
  padding-top: 8px;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-sub);
  padding: 8px 18px;
  border: 1px solid var(--border-card);
  border-radius: 999px;
  transition: all var(--transition);
}
.back-link:hover {
  color: var(--secondary);
  border-color: rgba(53,224,255,0.4);
  box-shadow: 0 0 16px rgba(53,224,255,0.12);
}

/* ===== CTA ===== */
.cta-section {
  position: relative;
  margin-top: 40px;
  padding: 80px 0;
  overflow: hidden;
  background:
    radial-gradient(700px 300px at 50% 120%, rgba(23,107,255,0.25), transparent 70%),
    linear-gradient(180deg, rgba(8,11,20,0.92), rgba(8,11,20,0.96)),
    url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-top: 1px solid rgba(53,224,255,0.15);
  border-bottom: 1px solid rgba(53,224,255,0.15);
}
.cta-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.cta-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 18px;
  color: #EEF3FC;
}
.cta-sub {
  font-size: 1rem;
  color: var(--text-sub);
  margin-bottom: 34px;
  line-height: 1.8;
}
.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 34px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: var(--radius-sm);
  box-shadow: 0 0 24px rgba(53,224,255,0.35);
  transition: all var(--transition);
}
.btn-primary:hover {
  box-shadow: 0 0 40px rgba(53,224,255,0.65);
  transform: translateY(-2px);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 30px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  border: 1px solid rgba(53,224,255,0.4);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  backdrop-filter: blur(8px);
  transition: all var(--transition);
}
.btn-outline:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  box-shadow: 0 0 24px rgba(53,224,255,0.2);
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.site-footer {
  background: #060912;
  border-top: 1px solid rgba(53,224,255,0.2);
  padding: 64px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 44px;
  margin-bottom: 48px;
}
.footer-brand {
  display: inline-flex;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.footer-brand p { margin-top: 8px; }
.footer-brand .brand-h {
  color: var(--secondary);
  text-shadow: 0 0 12px rgba(53,224,255,0.7);
}
.footer-col p {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-top: 8px;
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(53,224,255,0.2);
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul a {
  font-size: 0.9rem;
  color: var(--text-sub);
  transition: color var(--transition);
}
.footer-col ul a:hover {
  color: var(--secondary);
}
.footer-col li {
  font-size: 0.9rem;
  color: var(--text-sub);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-weak);
}
.footer-bottom a {
  color: var(--text-weak);
  transition: color var(--transition);
}
.footer-bottom a:hover { color: var(--secondary); }

/* ===== 浮动CTA ===== */
.float-cta {
  position: fixed;
  right: 28px;
  bottom: 32px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 999px;
  box-shadow: 0 0 25px rgba(53,224,255,0.4);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all 280ms ease;
}
.float-cta.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.float-cta:hover {
  box-shadow: 0 0 40px rgba(53,224,255,0.7);
  transform: translateY(-2px);
}
.float-cta::before {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  border: 1px solid rgba(53,224,255,0.4);
  animation: pulse-ring 2.4s ease-out infinite;
}
@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.7; }
  100% { transform: scale(1.08); opacity: 0; }
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(5,8,16,0.72);
  backdrop-filter: blur(8px);
  padding: 20px;
}
.modal.open { display: flex; }
.modal-content {
  width: 100%;
  max-width: 460px;
  background: var(--bg-panel);
  border: 1px solid rgba(53,224,255,0.2);
  border-radius: var(--radius-lg);
  padding: 34px 32px;
  box-shadow: 0 0 60px rgba(23,107,255,0.2);
  position: relative;
}
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-sub);
  border-radius: 50%;
  transition: all var(--transition);
}
.modal-close:hover {
  color: var(--secondary);
  background: rgba(53,224,255,0.08);
}
.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: #EAF0F9;
}
.modal-sub {
  font-size: 0.92rem;
  color: var(--text-sub);
  margin-bottom: 24px;
}
.modal-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.modal-form label {
  font-size: 0.85rem;
  color: var(--text-sub);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.modal-form input,
.modal-form textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 1rem;
  transition: all var(--transition);
}
.modal-form input:focus,
.modal-form textarea:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(53,224,255,0.15);
}
.modal-form textarea {
  min-height: 80px;
  resize: vertical;
}
.modal-form .btn-primary {
  justify-content: center;
  width: 100%;
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}
@media (max-width: 768px) {
  .header-inner { height: 64px; }
  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(8,12,24,0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(53,224,255,0.25);
    padding: 10px 20px 20px;
    display: none;
    z-index: 99;
  }
  .main-nav.open { display: flex; }
  .nav-link {
    padding: 13px 18px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    border-radius: 0;
  }
  .nav-link:last-child { border-bottom: none; }
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .btn-nav { padding: 8px 18px; font-size: 0.85rem; }
  .article-hero { padding: 40px 0 30px; }
  .article-title { font-size: 1.65rem; }
  .article-meta { gap: 12px; font-size: 0.83rem; }
  .article-main { padding: 32px 0 10px; }
  .article-content { font-size: 1rem; }
  .article-content h2 { font-size: 1.5rem; }
  .article-content h3 { font-size: 1.25rem; }
  .related-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .related-thumb { width: 84px; height: 64px; }
  .cta-section { padding: 56px 0; }
  .cta-actions { flex-direction: column; align-items: stretch; }
  .cta-actions .btn-primary,
  .cta-actions .btn-outline { justify-content: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; gap: 6px; }
  .float-cta { right: 16px; bottom: 20px; padding: 10px 20px; font-size: 0.88rem; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .container-narrow { padding: 0 16px; }
  .brand { font-size: 1.15rem; }
  .btn-nav { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* roulang page: category3 */
:root {
            --bg-dark: #080B14;
            --bg-panel: #0D1220;
            --primary: #176BFF;
            --secondary: #35E0FF;
            --accent: #7A5CFF;
            --success: #2EE6A0;
            --text-main: #E6EDF7;
            --text-sub: #94A3B8;
            --text-dim: #5B6B85;
            --border: rgba(255, 255, 255, 0.08);
            --card-bg: rgba(255, 255, 255, 0.045);
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 20px rgba(53, 224, 255, 0.35);
            --btn-gradient: linear-gradient(135deg, #176BFF 0%, #7A5CFF 100%);
            --section-pad: 96px 0;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            background: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.8;
            letter-spacing: 0.01em;
            overflow-x: hidden;
        }

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

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

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

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

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

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 72px;
            background: rgba(8, 12, 24, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(53, 224, 255, 0.25);
        }

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

        .brand {
            display: flex;
            align-items: center;
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .brand-h {
            color: var(--secondary);
            text-shadow: 0 0 12px rgba(53, 224, 255, 0.6);
            margin-right: 2px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .main-nav .nav-link {
            font-size: 0.95rem;
            font-weight: 400;
            color: var(--text-main);
            padding: 8px 4px;
            position: relative;
            transition: color 0.24s ease-out, box-shadow 0.24s ease-out;
            white-space: nowrap;
        }

        .main-nav .nav-link:hover {
            color: var(--secondary);
            box-shadow: 0 4px 0 -2px rgba(53, 224, 255, 0.8);
        }

        .main-nav .nav-link.active {
            color: var(--secondary);
            text-shadow: 0 0 8px rgba(53, 224, 255, 0.8);
            box-shadow: 0 4px 0 -2px rgba(53, 224, 255, 0.8);
            background: rgba(53, 224, 255, 0.06);
            border-radius: 4px;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.95rem;
            font-weight: 500;
            letter-spacing: 0.3px;
            border-radius: 8px;
            padding: 12px 24px;
            transition: all 0.18s ease-out;
            outline: none;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn:focus-visible {
            outline: 2px solid rgba(53, 224, 255, 0.5);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--btn-gradient);
            color: #fff;
            box-shadow: 0 0 20px rgba(53, 224, 255, 0.35);
            border: 1px solid rgba(53, 224, 255, 0.2);
        }

        .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53, 224, 255, 0.6);
            transform: translateY(-1px);
            filter: brightness(1.1);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 0 16px rgba(53, 224, 255, 0.4);
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.18);
            color: var(--text-main);
            backdrop-filter: blur(4px);
        }

        .btn-ghost:hover {
            border-color: rgba(53, 224, 255, 0.6);
            color: var(--secondary);
            box-shadow: 0 0 20px rgba(53, 224, 255, 0.2);
            transform: translateY(-1px);
        }

        .btn-ghost:active {
            transform: translateY(0);
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 0.88rem;
        }

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

        .menu-toggle span {
            width: 22px;
            height: 2px;
            background: var(--text-main);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .page-hero {
            position: relative;
            min-height: 320px;
            display: flex;
            align-items: center;
            padding: 140px 0 80px;
            background: linear-gradient(180deg, rgba(8, 11, 20, 0.88), rgba(8, 11, 20, 0.96)), url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(53, 224, 255, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(53, 224, 255, 0.08) 1px, transparent 1px);
            background-size: 48px 48px;
            pointer-events: none;
        }

        .page-hero::after {
            content: '';
            position: absolute;
            right: -120px;
            top: 50%;
            transform: translateY(-50%);
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(23, 107, 255, 0.35), transparent 70%);
            filter: blur(30px);
            pointer-events: none;
        }

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

        .hero-badge {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border: 1px solid rgba(53, 224, 255, 0.4);
            border-radius: 100px;
            font-size: 0.85rem;
            color: var(--secondary);
            margin-bottom: 20px;
            text-shadow: 0 0 8px rgba(53, 224, 255, 0.4);
            background: rgba(53, 224, 255, 0.06);
        }

        .page-hero h1 {
            font-size: clamp(2.2rem, 4.5vw, 3.6rem);
            font-weight: 700;
            letter-spacing: -0.01em;
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .page-hero .hero-sub {
            font-size: 1.1rem;
            color: var(--text-sub);
            max-width: 640px;
            line-height: 1.8;
            margin-bottom: 32px;
        }

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

        .guide-layout {
            display: grid;
            grid-template-columns: 260px 1fr;
            gap: 56px;
            padding: 72px 24px 96px;
            position: relative;
            z-index: 2;
        }

        .guide-menu {
            position: sticky;
            top: 96px;
            align-self: start;
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 16px 12px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 14px;
        }

        .guide-menu a {
            display: flex;
            align-items: center;
            padding: 12px 16px;
            font-size: 0.95rem;
            color: var(--text-sub);
            border-radius: 8px;
            transition: all 0.2s ease-out;
            border-left: 2px solid transparent;
        }

        .guide-menu a:hover {
            color: var(--secondary);
            background: rgba(53, 224, 255, 0.06);
            border-left-color: var(--secondary);
        }

        .guide-menu a.active-menu {
            color: var(--secondary);
            background: rgba(53, 224, 255, 0.08);
            border-left-color: var(--secondary);
            text-shadow: 0 0 8px rgba(53, 224, 255, 0.4);
        }

        .guide-content {
            min-width: 0;
        }

        .content-section {
            padding: 16px 0 72px;
        }

        .section-heading {
            margin-bottom: 40px;
        }

        .section-tag {
            display: inline-block;
            font-size: 0.82rem;
            color: var(--secondary);
            border: 1px solid rgba(53, 224, 255, 0.3);
            border-radius: 100px;
            padding: 4px 14px;
            margin-bottom: 14px;
            text-shadow: 0 0 6px rgba(53, 224, 255, 0.3);
        }

        .section-heading h2 {
            font-size: clamp(1.75rem, 2.5vw, 2.25rem);
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
            position: relative;
            padding-bottom: 14px;
        }

        .section-heading h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 3px;
            background: var(--btn-gradient);
            box-shadow: 0 0 12px rgba(53, 224, 255, 0.5);
            border-radius: 4px;
        }

        .section-heading .section-desc {
            color: var(--text-sub);
            margin-top: 14px;
            font-size: 0.95rem;
            max-width: 620px;
        }

        .scope-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 48px;
            align-items: stretch;
        }

        .scope-items {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .scope-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 14px;
            padding: 20px 24px;
            transition: all 0.2s ease-out;
        }

        .scope-item:hover {
            border-color: rgba(53, 224, 255, 0.4);
            background: rgba(255, 255, 255, 0.06);
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(23, 107, 255, 0.1);
        }

        .scope-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: rgba(23, 107, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(23, 107, 255, 0.3);
            color: var(--secondary);
        }

        .scope-item h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-main);
        }

        .scope-item p {
            font-size: 0.92rem;
            color: var(--text-sub);
            line-height: 1.7;
        }

        .scope-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
            min-height: 300px;
        }

        .scope-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: brightness(0.85) contrast(1.05);
        }

        .scope-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(0, 0, 0, 0), rgba(8, 11, 20, 0.5));
            pointer-events: none;
        }

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

        .scenario-card {
            position: relative;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 16px;
            padding: 32px 24px 24px;
            transition: all 0.2s ease-out;
            overflow: hidden;
        }

        .scenario-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--btn-gradient);
            opacity: 0;
            transition: opacity 0.2s ease;
        }

        .scenario-card:hover {
            border-color: rgba(53, 224, 255, 0.35);
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(23, 107, 255, 0.1);
        }

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

        .scenario-num {
            font-size: 0.85rem;
            color: var(--text-dim);
            font-weight: 400;
            letter-spacing: 0.05em;
            margin-bottom: 12px;
            display: block;
        }

        .scenario-icon {
            width: 42px;
            height: 42px;
            border-radius: 10px;
            background: rgba(53, 224, 255, 0.08);
            border: 1px solid rgba(53, 224, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            color: var(--secondary);
        }

        .scenario-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .scenario-card p {
            font-size: 0.92rem;
            color: var(--text-sub);
            line-height: 1.7;
        }

        .process-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .process-timeline {
            position: relative;
            padding-left: 28px;
        }

        .process-timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: rgba(53, 224, 255, 0.2);
        }

        .process-step {
            position: relative;
            padding: 16px 0 24px 32px;
        }

        .process-step::before {
            content: '';
            position: absolute;
            left: -24px;
            top: 24px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 16px rgba(53, 224, 255, 0.8);
            border: 2px solid var(--bg-dark);
        }

        .process-step:nth-child(even)::before {
            background: var(--primary);
            box-shadow: 0 0 16px rgba(23, 107, 255, 0.8);
        }

        .process-step h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .process-step p {
            font-size: 0.92rem;
            color: var(--text-sub);
        }

        .process-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
            min-height: 280px;
        }

        .process-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: brightness(0.85) contrast(1.05);
        }

        .faq-list {
            max-width: 860px;
        }

        .faq-item {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 14px;
            padding: 0;
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color 0.2s ease, background 0.2s ease;
            border-left: 3px solid transparent;
        }

        .faq-item.active {
            background: rgba(255, 255, 255, 0.06);
            border-left-color: var(--secondary);
            border-color: rgba(53, 224, 255, 0.3);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 1.05rem;
            font-weight: 500;
            color: var(--text-main);
        }

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(23, 107, 255, 0.15);
            border: 1px solid rgba(53, 224, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--secondary);
            transition: transform 0.2s ease;
            position: relative;
        }

        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            background: currentColor;
            border-radius: 2px;
        }

        .faq-icon::before {
            width: 12px;
            height: 2px;
        }

        .faq-icon::after {
            width: 2px;
            height: 12px;
            transition: opacity 0.2s ease;
        }

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

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

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

        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-sub);
            line-height: 1.7;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 14px;
        }

        .cta-section {
            position: relative;
            padding: 88px 0;
            background: linear-gradient(180deg, rgba(8, 11, 20, 0.85), rgba(0, 0, 0, 0.6)), url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            text-align: center;
            overflow: hidden;
        }

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

        .cta-section h2 {
            font-size: clamp(1.8rem, 3vw, 2.6rem);
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 16px;
            text-shadow: 0 0 30px rgba(53, 224, 255, 0.3);
        }

        .cta-section p {
            color: var(--text-sub);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }

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

        .site-footer {
            background: #060910;
            border-top: 1px solid rgba(53, 224, 255, 0.25);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 48px;
        }

        .footer-brand-col p {
            color: var(--text-sub);
            font-size: 0.95rem;
            margin-top: 16px;
            max-width: 320px;
            line-height: 1.7;
        }

        .footer-brand {
            font-size: 1.35rem;
            color: #fff;
            font-weight: 700;
        }

        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 8px;
        }

        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 24px;
            height: 2px;
            background: var(--secondary);
            box-shadow: 0 0 8px rgba(53, 224, 255, 0.5);
        }

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

        .footer-col ul li {
            margin-bottom: 10px;
            font-size: 0.9rem;
            color: var(--text-sub);
        }

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

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 18px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-dim);
        }

        .float-cta {
            position: fixed;
            right: 32px;
            bottom: 32px;
            z-index: 90;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 22px;
            background: var(--btn-gradient);
            color: #fff;
            border-radius: 100px;
            font-size: 0.92rem;
            font-weight: 500;
            box-shadow: 0 0 20px rgba(53, 224, 255, 0.35);
            opacity: 0;
            transform: translateY(16px);
            pointer-events: none;
            transition: all 0.3s ease-out;
            border: 1px solid rgba(53, 224, 255, 0.3);
        }

        .float-cta.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }

        .float-cta:hover {
            box-shadow: 0 0 32px rgba(53, 224, 255, 0.6);
            filter: brightness(1.1);
        }

        .reveal {
            opacity: 0;
            transform: translateY(12px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }

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

        @media (max-width: 1024px) {
            .guide-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .guide-menu {
                position: static;
                flex-direction: row;
                flex-wrap: wrap;
                gap: 8px;
                padding: 12px;
            }

            .guide-menu a {
                border-left: none;
                border-bottom: 2px solid transparent;
                padding: 8px 14px;
                font-size: 0.9rem;
            }

            .guide-menu a:hover,
            .guide-menu a.active-menu {
                border-left-color: transparent;
                border-bottom-color: var(--secondary);
            }

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

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

            .process-image {
                min-height: 200px;
            }

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

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

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }

            .menu-toggle {
                display: flex;
            }

            .main-nav {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: rgba(10, 14, 26, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                border-bottom: 1px solid rgba(53, 224, 255, 0.2);
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.4s ease-out;
                z-index: 99;
            }

            .main-nav.open {
                max-height: 400px;
            }

            .main-nav .nav-link {
                display: block;
                padding: 16px 24px;
                border-top: 1px solid rgba(255, 255, 255, 0.04);
                font-size: 1rem;
                box-shadow: none !important;
                border-radius: 0;
            }

            .main-nav .nav-link.active {
                background: rgba(53, 224, 255, 0.06);
            }

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

            .page-hero {
                min-height: 260px;
                padding: 110px 0 50px;
            }

            .page-hero .hero-sub {
                font-size: 1rem;
            }

            .scope-grid,
            .scenario-grid,
            .process-layout {
                grid-template-columns: 1fr;
            }

            .section-heading h2 {
                font-size: 1.7rem;
            }

            .content-section {
                padding: 16px 0 48px;
            }

            .cta-section {
                padding: 64px 0;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 100px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }

            .float-cta {
                right: 16px;
                bottom: 16px;
                padding: 12px 18px;
            }

            .guide-layout {
                padding: 48px 16px 72px;
            }
        }

        @media (max-width: 520px) {
            .scenario-grid {
                grid-template-columns: 1fr;
            }

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

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

            .page-hero h1 {
                font-size: 2rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg: #080B14;
            --bg-panel: #0D1220;
            --bg-card: rgba(255, 255, 255, 0.045);
            --border: rgba(255, 255, 255, 0.08);
            --primary: #176BFF;
            --secondary: #35E0FF;
            --accent: #7A5CFF;
            --success: #2EE6A0;
            --text: #E6EDF7;
            --text-secondary: #94A3B8;
            --text-muted: #5B6B85;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
            --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 96px;
        }

        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.8;
            letter-spacing: 0.01em;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        ul, ol {
            list-style: none;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 2px solid rgba(53, 224, 255, 0.5);
            outline-offset: 2px;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.95rem;
            font-weight: 600;
            padding: 11px 26px;
            border-radius: var(--radius-sm);
            transition: all 0.18s ease-out;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            color: #fff;
            box-shadow: 0 0 20px rgba(53, 224, 255, 0.35);
        }
        .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53, 224, 255, 0.6);
            filter: brightness(1.1);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            filter: brightness(0.95);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.16);
        }
        .btn-secondary:hover {
            border-color: rgba(53, 224, 255, 0.5);
            color: var(--secondary);
            box-shadow: 0 0 20px rgba(53, 224, 255, 0.15);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 200;
            background: rgba(8, 12, 24, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(53, 224, 255, 0.25);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .brand {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.01em;
            display: flex;
            align-items: center;
            gap: 2px;
        }
        .brand-h {
            color: var(--secondary);
            text-shadow: 0 0 12px rgba(53, 224, 255, 0.6);
        }

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

        .main-nav .nav-link {
            color: var(--text);
            font-size: 0.95rem;
            padding: 8px 16px;
            border-radius: 6px;
            transition: all 0.24s ease-out;
            position: relative;
            font-weight: 400;
        }

        .main-nav .nav-link:hover {
            color: var(--secondary);
            text-shadow: 0 0 8px rgba(53, 224, 255, 0.6);
        }

        .main-nav .nav-link.active {
            color: var(--secondary);
            text-shadow: 0 0 8px rgba(53, 224, 255, 0.8);
            background: rgba(53, 224, 255, 0.06);
        }

        .main-nav .nav-link.active::after {
            content: '';
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 2px;
            height: 2px;
            background: var(--secondary);
            box-shadow: 0 0 8px rgba(53, 224, 255, 0.8);
            border-radius: 2px;
        }

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

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .nav-toggle span {
            display: block;
            width: 18px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all 0.25s ease-out;
        }
        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== Page Hero ===== */
        .page-hero {
            position: relative;
            min-height: 340px;
            display: flex;
            align-items: center;
            padding: 140px 0 80px;
            background-image:
                linear-gradient(rgba(53, 224, 255, 0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(53, 224, 255, 0.05) 1px, transparent 1px),
                radial-gradient(ellipse at 70% 30%, rgba(23, 107, 255, 0.18), transparent 60%),
                url('/assets/images/backpic/back-2.png');
            background-size: 60px 60px, 60px 60px, cover, cover;
            background-position: center;
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(8, 11, 20, 0.2), rgba(8, 11, 20, 0.9));
            z-index: 1;
        }

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

        .page-hero h1 {
            font-size: clamp(2.4rem, 5vw, 3.4rem);
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin-bottom: 16px;
            text-shadow: 0 0 24px rgba(53, 224, 255, 0.25);
        }

        .page-hero p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.9;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 999px;
            border: 1px solid rgba(53, 224, 255, 0.4);
            color: var(--secondary);
            font-size: 0.8rem;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
            background: rgba(53, 224, 255, 0.06);
        }
        .hero-tag .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 8px var(--secondary);
        }

        /* ===== Category Layout ===== */
        .category-content {
            padding: 96px 0;
            background: var(--bg);
        }

        .category-layout {
            display: grid;
            grid-template-columns: 260px 1fr;
            gap: 56px;
            align-items: start;
        }

        .toc-sidebar {
            position: sticky;
            top: 104px;
            align-self: start;
        }

        .toc-nav {
            background: var(--bg-panel);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow);
        }

        .toc-nav h3 {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border);
        }

        .toc-nav ul {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .toc-nav a {
            display: block;
            padding: 10px 14px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            border-radius: 8px;
            border-left: 2px solid transparent;
            transition: all 0.2s ease-out;
        }

        .toc-nav a:hover {
            color: var(--secondary);
            background: rgba(53, 224, 255, 0.05);
        }

        .toc-nav a.active {
            color: var(--secondary);
            background: rgba(53, 224, 255, 0.08);
            border-left-color: var(--secondary);
            font-weight: 500;
            text-shadow: 0 0 8px rgba(53, 224, 255, 0.3);
        }

        .toc-card {
            margin-top: 20px;
            background: linear-gradient(135deg, rgba(23, 107, 255, 0.12), rgba(122, 92, 255, 0.08));
            border: 1px solid rgba(53, 224, 255, 0.2);
            border-radius: var(--radius-md);
            padding: 20px;
            text-align: center;
        }
        .toc-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 14px;
        }
        .toc-card .btn {
            width: 100%;
            font-size: 0.9rem;
            padding: 10px 16px;
        }

        .content-main {
            min-width: 0;
        }

        .content-section {
            margin-bottom: 72px;
            scroll-margin-top: 96px;
        }

        .content-section:last-child {
            margin-bottom: 0;
        }

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

        .section-heading h2 {
            font-size: clamp(1.6rem, 3vw, 2.1rem);
            font-weight: 700;
            line-height: 1.3;
            padding-bottom: 16px;
            position: relative;
            margin-bottom: 12px;
        }

        .section-heading h2::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 56px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 3px;
            box-shadow: 0 0 12px rgba(53, 224, 255, 0.5);
        }

        .section-heading p {
            color: var(--text-secondary);
            font-size: 1rem;
            max-width: 700px;
        }

        /* ===== Scope Section ===== */
        .scope-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .scope-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .scope-item {
            display: flex;
            gap: 16px;
            padding: 18px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            transition: all 0.2s ease-out;
        }
        .scope-item:hover {
            border-color: rgba(53, 224, 255, 0.4);
            background: rgba(255, 255, 255, 0.06);
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(23, 107, 255, 0.1);
        }

        .scope-dot {
            flex-shrink: 0;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--secondary);
            box-shadow: 0 0 10px rgba(53, 224, 255, 0.8);
            margin-top: 8px;
            position: relative;
        }

        .scope-item h3 {
            font-size: 1.02rem;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--text);
        }

        .scope-item p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .scope-visual {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: var(--shadow);
        }

        .scope-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 420px;
        }

        .scope-visual::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(0, 0, 0, 0), rgba(8, 11, 20, 0.5));
            pointer-events: none;
        }

        .scope-visual-caption {
            position: absolute;
            left: 20px;
            right: 20px;
            bottom: 20px;
            z-index: 2;
            background: rgba(8, 12, 24, 0.75);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(53, 224, 255, 0.2);
            border-radius: 12px;
            padding: 14px 18px;
        }
        .scope-visual-caption p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .scope-visual-caption strong {
            color: var(--secondary);
            font-weight: 600;
        }

        /* ===== Scenarios ===== */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .scenario-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.2s ease-out;
            position: relative;
            overflow: hidden;
        }

        .scenario-card:hover {
            border-color: rgba(53, 224, 255, 0.4);
            background: rgba(255, 255, 255, 0.06);
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(23, 107, 255, 0.12);
        }

        .scenario-card.featured {
            grid-column: span 2;
            background: linear-gradient(135deg, rgba(23, 107, 255, 0.12), rgba(122, 92, 255, 0.06)), var(--bg-card);
            border-color: rgba(53, 224, 255, 0.25);
        }

        .scenario-card.wide {
            grid-column: span 2;
        }

        .scenario-num {
            font-size: 2.6rem;
            font-weight: 800;
            color: rgba(255, 255, 255, 0.06);
            position: absolute;
            top: 14px;
            right: 18px;
            line-height: 1;
            font-family: inherit;
            letter-spacing: -0.03em;
        }

        .scenario-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: rgba(53, 224, 255, 0.1);
            border: 1px solid rgba(53, 224, 255, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            color: var(--secondary);
        }

        .scenario-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .scenario-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Process ===== */
        .process-timeline {
            position: relative;
            padding-left: 36px;
        }

        .process-timeline::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: linear-gradient(180deg, rgba(53, 224, 255, 0.5), rgba(53, 224, 255, 0.05));
        }

        .process-step {
            position: relative;
            padding-bottom: 36px;
        }

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

        .process-dot {
            position: absolute;
            left: -36px;
            top: 6px;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--bg);
            border: 2px solid var(--secondary);
            box-shadow: 0 0 0 4px rgba(53, 224, 255, 0.1), 0 0 16px rgba(53, 224, 255, 0.4);
        }

        .process-step h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .process-step .step-tag {
            font-size: 0.7rem;
            background: rgba(53, 224, 255, 0.1);
            border: 1px solid rgba(53, 224, 255, 0.3);
            color: var(--secondary);
            padding: 2px 10px;
            border-radius: 999px;
            font-weight: 500;
            letter-spacing: 0.5px;
        }

        .process-step p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.75;
            max-width: 700px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all 0.2s ease-out;
        }

        .faq-item:hover {
            border-color: rgba(255, 255, 255, 0.14);
        }

        .faq-item.open {
            background: rgba(255, 255, 255, 0.06);
            border-color: rgba(53, 224, 255, 0.35);
            border-left: 3px solid var(--secondary);
        }

        .faq-question {
            display: flex;
            align-items: center;
            gap: 16px;
            width: 100%;
            padding: 20px 24px;
            text-align: left;
            font-size: 1.05rem;
            color: var(--text);
            font-weight: 500;
            background: none;
            border: none;
            transition: all 0.2s ease-out;
        }

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

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 6px;
            border: 1px solid rgba(53, 224, 255, 0.4);
            color: var(--secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 400;
            transition: all 0.2s ease-out;
            line-height: 1;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: rgba(53, 224, 255, 0.12);
            border-color: var(--secondary);
            box-shadow: 0 0 12px rgba(53, 224, 255, 0.3);
        }

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

        .faq-answer-inner {
            padding: 0 24px 22px 68px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.85;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            padding: 96px 0;
            text-align: center;
            background-image:
                linear-gradient(rgba(53, 224, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(53, 224, 255, 0.04) 1px, transparent 1px),
                radial-gradient(ellipse at center, rgba(23, 107, 255, 0.25), transparent 70%);
            background-size: 48px 48px, 48px 48px, cover;
            background-color: #0A0E1A;
            border-top: 1px solid rgba(53, 224, 255, 0.15);
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(180deg, var(--bg), rgba(10, 14, 26, 0));
        }

        .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 700px;
            margin: 0 auto;
        }

        .cta-inner h2 {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            font-weight: 700;
            margin-bottom: 18px;
            line-height: 1.35;
            text-shadow: 0 0 30px rgba(53, 224, 255, 0.35);
        }

        .cta-inner p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 36px;
            line-height: 1.85;
        }

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

        /* ===== Footer ===== */
        .site-footer {
            background: #060A12;
            border-top: 1px solid rgba(53, 224, 255, 0.2);
            padding: 64px 0 0;
        }

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

        .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            gap: 2px;
            margin-bottom: 16px;
        }

        .footer-brand .brand-h {
            color: var(--secondary);
        }

        .footer-brand-col p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.8;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 18px;
            padding-bottom: 10px;
            position: relative;
            letter-spacing: 0.5px;
        }

        .footer-col h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 28px;
            height: 2px;
            background: var(--secondary);
            box-shadow: 0 0 8px rgba(53, 224, 255, 0.5);
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col li {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .footer-col a {
            color: var(--text-secondary);
            transition: color 0.2s ease-out;
        }
        .footer-col a:hover {
            color: var(--secondary);
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-bottom p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== Float CTA ===== */
        .float-cta {
            position: fixed;
            right: 24px;
            bottom: 32px;
            z-index: 150;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 12px 22px;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-size: 0.9rem;
            font-weight: 600;
            box-shadow: 0 0 16px rgba(53, 224, 255, 0.35);
            opacity: 0;
            visibility: hidden;
            transform: translateY(16px);
            transition: all 0.35s ease-out;
            letter-spacing: 0.3px;
        }

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

        .float-cta:hover {
            box-shadow: 0 0 28px rgba(53, 224, 255, 0.65);
            transform: translateY(-2px);
        }

        @keyframes pulse-glow {
            0% { box-shadow: 0 0 12px rgba(53, 224, 255, 0.3); }
            50% { box-shadow: 0 0 28px rgba(53, 224, 255, 0.55); }
            100% { box-shadow: 0 0 12px rgba(53, 224, 255, 0.3); }
        }

        .float-cta.visible {
            animation: pulse-glow 2.4s ease-in-out infinite;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .category-layout {
                grid-template-columns: 220px 1fr;
                gap: 36px;
            }

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

            .scope-visual img {
                min-height: 300px;
                max-height: 420px;
            }

            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scenario-card.featured {
                grid-column: span 2;
            }
            .scenario-card.wide {
                grid-column: span 2;
            }

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

        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }

            .nav-cta {
                display: none;
            }

            .main-nav {
                position: fixed;
                top: 72px;
                right: 0;
                width: min(320px, 85vw);
                height: calc(100vh - 72px);
                background: rgba(8, 12, 24, 0.96);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: stretch;
                padding: 24px;
                gap: 8px;
                border-left: 1px solid rgba(53, 224, 255, 0.2);
                box-shadow: -20px 0 60px rgba(0, 0, 0, 0.6);
                transform: translateX(100%);
                transition: transform 0.3s ease-out;
                z-index: 100;
            }

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

            .main-nav .nav-link {
                font-size: 1.05rem;
                padding: 14px 16px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                border-radius: 0;
            }

            .main-nav .nav-link.active::after {
                left: 0;
                right: auto;
                width: 3px;
                bottom: auto;
                top: 0;
                height: 100%;
            }

            .category-content {
                padding: 64px 0;
            }

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

            .toc-sidebar {
                position: static;
            }

            .toc-nav {
                padding: 16px;
            }

            .toc-nav ul {
                flex-direction: row;
                flex-wrap: wrap;
                gap: 4px;
            }

            .toc-nav a {
                padding: 6px 12px;
                font-size: 0.85rem;
                border-left: none;
                border-bottom: 2px solid transparent;
                border-radius: 6px;
            }
            .toc-nav a.active {
                border-left: none;
                border-bottom-color: var(--secondary);
                background: rgba(53, 224, 255, 0.08);
            }

            .toc-card {
                display: none;
            }

            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .scenario-card.featured,
            .scenario-card.wide {
                grid-column: span 1;
            }

            .page-hero {
                min-height: 300px;
                padding: 120px 0 56px;
            }

            .page-hero p {
                font-size: 1rem;
            }

            .cta-section {
                padding: 64px 0;
            }

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

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

        @media (max-width: 520px) {
            .container {
                padding: 0 18px;
            }

            .header-inner {
                padding: 0 18px;
            }

            .btn {
                padding: 10px 18px;
                font-size: 0.9rem;
            }

            .page-hero h1 {
                font-size: 2rem;
            }

            .scope-item {
                padding: 14px 16px;
            }

            .scenario-card {
                padding: 22px;
            }

            .faq-question {
                padding: 16px 16px;
                font-size: 0.95rem;
            }
            .faq-answer-inner {
                padding: 0 16px 18px 48px;
            }

            .float-cta {
                right: 16px;
                bottom: 20px;
                padding: 10px 16px;
                font-size: 0.85rem;
            }

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