/* roulang page: index */
:root {
  --bg-primary: #0A0E17;
  --bg-panel: #0C1322;
  --bg-dark: #070A11;
  --neon-cyan: #00D4FF;
  --neon-aux: #7C8CFF;
  --warn-gold: #FFB800;
  --text-main: #E8F0FF;
  --text-secondary: #9AA8C0;
  --text-muted: #6B7A93;
  --border-light: rgba(255,255,255,0.08);
  --glass-bg: rgba(255,255,255,0.04);
  --radius-card: 16px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 0 1px rgba(0,212,255,0.2), 0 8px 32px rgba(0,212,255,0.1);
  --shadow-btn: 0 0 20px rgba(0,212,255,0.4);
  --font-cn: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-num: "Barlow Condensed", "DIN Alternate", "Arial Narrow", sans-serif;
  --container-max: 1200px;
  --spacing-section: 96px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
::selection { background: rgba(0,212,255,0.3); color: #fff; }
:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0,212,255,0.4);
  border-radius: 4px;
}
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: var(--spacing-section) 0; }
.section-head {
  text-align: center;
  margin-bottom: 56px;
}
.section-head .tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--neon-cyan);
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.25);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}
.section-head h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}
.section-head p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  font-size: 15px;
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 64px;
  background: rgba(6,10,18,0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 1000;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-aux));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  color: #0A0E17;
  box-shadow: 0 0 16px rgba(0,212,255,0.5);
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(90deg, #fff, var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.main-nav a {
  font-size: 15px;
  font-weight: 500;
  color: #B6C2D9;
  position: relative;
  padding: 20px 0;
  transition: color 0.3s;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-cyan), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}
.main-nav a:hover { color: #fff; }
.main-nav a.active {
  color: #fff;
  text-shadow: 0 0 8px rgba(0,212,255,0.5);
}
.main-nav a.active::after {
  transform: scaleX(1);
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-aux));
  box-shadow: 0 0 10px rgba(0,212,255,0.6);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-aux));
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 0 12px rgba(0,212,255,0.3);
  min-height: 36px;
}
.nav-cta:hover {
  box-shadow: 0 0 24px rgba(0,212,255,0.5);
  transform: translateY(-1px);
}
.nav-cta:active { transform: scale(0.96); }
.burger {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 1001;
}
.burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  margin: 5px auto;
  transition: all 0.3s;
  border-radius: 2px;
}
.burger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  width: 100%;
  background: rgba(10,14,23,0.95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  padding: 24px;
  z-index: 999;
  border-bottom: 1px solid var(--border-light);
}
.mobile-menu a {
  display: block;
  padding: 14px 16px;
  color: var(--text-secondary);
  font-size: 16px;
  border-left: 3px solid transparent;
  transition: all 0.3s;
}
.mobile-menu a.active {
  color: var(--neon-cyan);
  border-left-color: var(--neon-cyan);
  background: rgba(0,212,255,0.06);
}
.mobile-menu a:hover { color: #fff; }

/* Hero */
.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  margin-top: 64px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, #0B0F1E 0%, rgba(11,15,30,0.85) 40%, transparent 100%);
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(60% 40% at 80% 10%, rgba(0,212,255,0.15), transparent);
  pointer-events: none;
}
.hero-grid-lines {
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  background-image:
    linear-gradient(rgba(0,212,255,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: radial-gradient(circle at center, black, transparent 70%);
  mask-image: radial-gradient(circle at center, black, transparent 70%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}
.hero-content .tag-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--neon-cyan);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
}
.hero-content .tag-line::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--neon-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--neon-cyan);
}
.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  text-shadow: 0 0 20px rgba(0,212,255,0.25);
}
.hero h1 .glow {
  color: var(--neon-cyan);
  text-shadow: 0 0 30px rgba(0,212,255,0.6);
}
.hero-sub {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  text-align: center;
}
.btn-primary {
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-aux));
  color: #fff;
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover {
  box-shadow: 0 0 28px rgba(0,212,255,0.5);
  transform: translateY(-2px);
}
.btn-primary:active { transform: scale(0.97); }
.btn-ghost {
  background: transparent;
  border: 1px solid rgba(0,212,255,0.5);
  color: var(--neon-cyan);
}
.btn-ghost:hover {
  background: rgba(0,212,255,0.1);
  transform: translateY(-2px);
}
.btn-ghost:active { transform: scale(0.97); }
.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.3);
  font-size: 24px;
  animation: floatDown 2s infinite;
  transition: color 0.3s;
  z-index: 2;
}
.scroll-indicator:hover { color: var(--neon-cyan); }
@keyframes floatDown {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* Quick Stats */
.stats-section {
  background: var(--bg-panel);
  padding: 48px 0;
  border-bottom: 1px solid var(--border-light);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s;
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,212,255,0.12);
  border-color: rgba(0,212,255,0.2);
}
.stat-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 16px;
  border-radius: 12px;
  background: rgba(0,212,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}
.stat-icon svg { width: 22px; height: 22px; stroke: var(--neon-cyan); stroke-width: 1.8; fill: none; }
.stat-number {
  font-family: var(--font-num);
  font-size: 36px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Tiers */
.tiers-section {
  background: linear-gradient(180deg, var(--bg-primary), var(--bg-panel));
}
.tiers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
  position: relative;
}
.tier-card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  position: relative;
  transition: all 0.3s;
}
.tier-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glass);
}
.tier-card.highlight {
  border: 1px solid rgba(0,212,255,0.4);
  box-shadow: 0 0 0 1px rgba(0,212,255,0.2), 0 8px 32px rgba(0,212,255,0.1);
  transform: scale(1.02);
}
.tier-card.highlight:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: 0 0 24px rgba(0,212,255,0.2);
}
.tier-level {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}
.tier-card:nth-child(1) .tier-level {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--text-secondary);
}
.tier-card:nth-child(2) .tier-level {
  background: transparent;
  border: 1px solid var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 12px rgba(0,212,255,0.2);
}
.tier-card:nth-child(3) .tier-level {
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-aux));
  color: #fff;
  box-shadow: 0 0 16px rgba(0,212,255,0.4);
}
.tier-name {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}
.tier-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 48px;
}
.tier-features {
  margin-bottom: 32px;
}
.tier-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.tier-features li::before {
  content: '';
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(0,212,255,0.15);
  flex-shrink: 0;
  margin-top: 3px;
  position: relative;
}
.tier-features li::after {
  content: '✓';
  position: absolute;
  font-size: 10px;
  color: var(--neon-cyan);
}
.tier-features li {
  position: relative;
  padding-left: 30px;
}
.tier-features li::before {
  position: absolute;
  left: 0;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(0,212,255,0.15);
  content: '';
}
.tier-features li::after {
  position: absolute;
  left: 4px;
  top: 11px;
  font-size: 10px;
  color: var(--neon-cyan);
  content: '✓';
}
.tier-features li {
  display: block;
  margin-bottom: 6px;
}
.tier-features li.disabled {
  color: var(--text-muted);
  opacity: 0.5;
}
.tier-features li.disabled::after {
  content: '×';
  color: var(--text-muted);
}
.tier-cta {
  width: 100%;
}
.tiers-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  color: var(--neon-cyan);
  opacity: 0.6;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  pointer-events: none;
}
.tiers-arrow.arrow-1 { left: 31%; }
.tiers-arrow.arrow-2 { right: 31%; }

/* Compare */
.compare-section {
  background: var(--bg-panel);
}
.compare-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.compare-card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  position: relative;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}
.compare-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glass);
  border-top: 2px solid var(--neon-cyan);
}
.compare-card.recommend {
  border-color: rgba(0,212,255,0.4);
  box-shadow: var(--shadow-glow);
}
.compare-card.recommend::before {
  content: '推荐';
  position: absolute;
  top: 12px;
  right: 12px;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-aux));
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  transform: rotate(3deg);
}
.plan-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.plan-price {
  font-family: var(--font-num);
  font-size: 44px;
  font-weight: 700;
  color: #fff;
  line-height: 1;
  margin-bottom: 4px;
}
.plan-price .unit {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}
.plan-period {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.plan-features {
  flex-grow: 1;
  margin-bottom: 28px;
}
.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.plan-features li::before {
  content: '';
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(0,212,255,0.15);
  position: relative;
  margin-top: 5px;
}
.plan-features li::after {
  content: '✓';
  position: absolute;
  font-size: 9px;
  color: var(--neon-cyan);
}
.plan-features li {
  position: relative;
  padding-left: 28px;
}
.plan-features li::before {
  position: absolute;
  left: 0;
  top: 13px;
}
.plan-features li::after {
  position: absolute;
  left: 3px;
  top: 12px;
  font-size: 9px;
  color: var(--neon-cyan);
}
.plan-features li.dim {
  color: var(--text-muted);
  opacity: 0.6;
}
.plan-features li.dim::after {
  content: '×';
  color: var(--text-muted);
}

/* Limited Time */
.limited-section {
  position: relative;
  overflow: hidden;
  background: var(--bg-primary);
}
.limited-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(50% 50% at 50% 50%, rgba(255,184,0,0.08), transparent),
    radial-gradient(50% 50% at 50% 50%, rgba(0,212,255,0.08), transparent);
  pointer-events: none;
}
.limited-content {
  position: relative;
  z-index: 2;
  text-align: center;
}
.limited-content h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 12px;
}
.limited-content .limited-sub {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 15px;
}
.countdown {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.countdown-item {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 24px 28px;
  min-width: 100px;
}
.countdown-number {
  font-family: var(--font-num);
  font-size: 48px;
  font-weight: 700;
  color: var(--neon-cyan);
  text-shadow: 0 0 12px rgba(0,212,255,0.4);
  line-height: 1;
}
.countdown-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
  letter-spacing: 0.1em;
}
.limited-content .btn {
  padding: 14px 48px;
  font-size: 16px;
}

/* CMS News */
.news-section {
  background: linear-gradient(180deg, var(--bg-primary), var(--bg-panel));
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.news-card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,212,255,0.12);
  border-top: 2px solid var(--neon-cyan);
}
.news-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.news-card:hover .news-thumb img { transform: scale(1.04); }
.news-cat {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0,212,255,0.9);
  color: #0A0E17;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}
.news-body {
  padding: 24px 20px 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.news-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-title a { color: var(--text-main); transition: color 0.3s; }
.news-title a:hover { color: var(--neon-cyan); }
.news-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
  flex-grow: 1;
}
.news-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 12px;
}
.news-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  color: var(--text-muted);
}

/* Contact Form */
.contact-section {
  background: var(--bg-primary);
}
.contact-wrap {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 48px;
}
.contact-info h3 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 16px;
}
.contact-info p {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 24px;
}
.contact-bullets li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 14px;
}
.contact-bullets li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: 0 0 6px var(--neon-cyan);
  flex-shrink: 0;
}
.contact-form .form-group {
  margin-bottom: 20px;
}
.contact-form label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.03em;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 12px 16px;
  color: var(--text-main);
  transition: all 0.3s;
  outline: none;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 12px rgba(0,212,255,0.2);
}
.contact-form select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' stroke='%239AA8C0' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
}
.contact-form textarea { min-height: 100px; resize: vertical; }
.contact-form .btn { width: 100%; margin-top: 8px; }
.privacy-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 12px;
  text-align: center;
}

/* FAQ */
.faq-section {
  background: var(--bg-panel);
}
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s;
}
.faq-item:hover { border-color: rgba(0,212,255,0.2); }
.faq-item.active {
  border-left: 3px solid var(--neon-cyan);
  box-shadow: 0 4px 20px rgba(0,212,255,0.08);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
}
.faq-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 300;
  color: var(--neon-cyan);
  transition: transform 0.3s;
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.active .faq-answer {
  max-height: 300px;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Footer */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid transparent;
  border-image: linear-gradient(90deg, transparent, var(--neon-cyan), transparent) 1;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding: 64px 0 48px;
}
.footer-brand .logo {
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li {
  padding: 4px 0;
}
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.3s;
}
.footer-col ul li a:hover { color: var(--neon-cyan); }
.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 6px 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.footer-contact li svg {
  width: 16px;
  height: 16px;
  stroke: var(--neon-cyan);
  flex-shrink: 0;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom p {
  font-size: 12px;
  color: #5C6B84;
}
.footer-bottom .footer-links a {
  font-size: 12px;
  color: #5C6B84;
  margin-left: 20px;
  transition: color 0.3s;
}
.footer-bottom .footer-links a:hover { color: var(--neon-cyan); }

/* Responsive */
@media (max-width: 1200px) {
  .container { padding: 0 24px; }
}
@media (max-width: 1024px) {
  .tiers-grid { grid-template-columns: 1fr; gap: 24px; }
  .tier-card.highlight { transform: none; }
  .tier-card.highlight:hover { transform: translateY(-4px); }
  .tiers-arrow { display: none; }
  .compare-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-wrap { grid-template-columns: 1fr; padding: 36px; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .burger { display: block; }
  .mobile-menu { display: block; }
  .nav-cta { display: none; }
  .hero { min-height: 520px; }
  .hero-content { padding: 60px 24px; }
  .section { padding: 56px 0; }
  .section-head { margin-bottom: 32px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .countdown-item { min-width: 70px; padding: 16px 14px; }
  .countdown-number { font-size: 32px; }
  .countdown { gap: 10px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 28px; }
  .hero-sub { font-size: 15px; }
  .hero-ctas { flex-direction: column; }
  .hero-ctas .btn { width: 100%; }
  .stats-grid { grid-template-columns: 1fr; }
  .contact-wrap { padding: 24px; }
  .tier-card { padding: 28px 20px; }
  .compare-card { padding: 28px 20px; }
}

/* roulang page: category1 */
/* ===== Design Variables ===== */
:root {
  --bg-dark: #0A0E17;
  --bg-panel: #0C1322;
  --bg-deeper: #070A11;
  --primary: #00D4FF;
  --primary-end: #7C8CFF;
  --warning: #FFB800;
  --text-main: #E8F0FF;
  --text-secondary: #9AA8C0;
  --text-muted: #6B7A93;
  --border: rgba(255,255,255,0.08);
  --border-light: rgba(255,255,255,0.06);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 0 1px rgba(0,212,255,0.2), 0 8px 32px rgba(0,212,255,0.1);
  --shadow-btn: 0 0 20px rgba(0,212,255,0.4);
  --gradient-btn: linear-gradient(135deg, #00D4FF, #7C8CFF);
  --gradient-line: linear-gradient(90deg, transparent, #00D4FF, transparent);
  --transition: all 0.3s ease;
  --max-w: 1200px;
  --header-h: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

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

input, select, textarea {
  font-family: inherit;
  font-size: 15px;
  color: var(--text-main);
}

ul, ol {
  list-style: none;
}

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

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(6, 10, 18, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  z-index: 100;
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
}

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

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.5);
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.main-nav a {
  font-size: 14px;
  font-weight: 500;
  color: #B6C2D9;
  position: relative;
  padding: 6px 2px;
  white-space: nowrap;
}

.main-nav a:hover {
  color: #fff;
}

.main-nav a.active {
  color: #fff;
  text-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
}

.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  border-radius: 2px;
}

.nav-cta {
  height: 38px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  background: var(--gradient-btn);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-btn);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-cta:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.5);
}

.nav-cta:active {
  transform: translateY(2px);
}

.nav-cta:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.3);
}

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

.burger span {
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

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

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

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

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-h) + 40px) 24px 56px;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  background-color: #0B0F1E;
  margin-top: var(--header-h);
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 15, 30, 0.88) 0%, rgba(11, 15, 30, 0.75) 60%, rgba(10, 14, 23, 1) 100%);
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(60% 50% at 50% 30%, rgba(0, 212, 255, 0.12), transparent);
  pointer-events: none;
}

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

.page-hero h1 {
  font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 800;
  letter-spacing: 0.03em;
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
  margin-bottom: 14px;
}

.page-hero p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

.hero-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 22px;
  flex-wrap: wrap;
}

.hero-tags span {
  padding: 7px 18px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== Main Section Spacing ===== */
.section {
  padding: 72px 0;
}

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

.section-head h2 {
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  margin-bottom: 10px;
}

.section-head p {
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Metrics ===== */
.metrics {
  padding: 56px 0 72px;
  position: relative;
}

.metrics::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: var(--gradient-line);
  opacity: 0.5;
}

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

.metric-card {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-glass);
}

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

.metric-icon {
  width: 42px;
  height: 42px;
  margin: 0 auto 14px;
  border-radius: 12px;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 18px;
}

.metric-num {
  font-family: "Barlow Condensed", "DIN Alternate", "Arial Narrow", sans-serif;
  font-size: 34px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-main);
  margin-bottom: 4px;
}

.metric-label {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

/* ===== Feature Cards ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

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

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

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

.feature-card:hover .card-img img {
  transform: scale(1.04);
}

.feature-card .card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(10, 14, 23, 0.7) 100%);
}

.feature-card .card-body {
  padding: 22px 22px 26px;
}

.feature-card .card-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  background: rgba(0, 212, 255, 0.12);
  color: var(--primary);
  border: 1px solid rgba(0, 212, 255, 0.25);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

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

/* ===== Step Flow ===== */
.flow-section {
  background: var(--bg-panel);
  position: relative;
  overflow: hidden;
}

.flow-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-line);
  opacity: 0.4;
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: flow-step;
}

.flow-item {
  position: relative;
  text-align: center;
  padding: 32px 18px;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.flow-item:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

.flow-num {
  width: 54px;
  height: 54px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--gradient-btn);
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.4);
  font-family: "Barlow Condensed", "DIN Alternate", sans-serif;
}

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

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

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

.related-card {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-glass);
}

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

.related-card .card-img {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  position: relative;
}

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

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

.related-card .card-body {
  padding: 20px;
}

.related-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
}

.related-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 12px;
}

.related-card .card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 12px;
}

.related-card .card-meta a {
  color: var(--primary);
  font-weight: 600;
}

.related-card .card-meta a:hover {
  text-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
}

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

.faq-item {
  margin-bottom: 14px;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(0, 212, 255, 0.25);
}

.faq-item.active {
  box-shadow: var(--shadow-glow);
  border-left: 3px solid var(--primary);
}

.faq-q {
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  user-select: none;
  color: var(--text-main);
}

.faq-q .faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.12);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-a-inner {
  padding: 0 22px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
}

.faq-item.active .faq-a {
  max-height: 320px;
}

/* ===== CTA Band ===== */
.cta-band {
  position: relative;
  padding: 72px 0;
  text-align: center;
  background: var(--bg-panel);
  overflow: hidden;
}

.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(50% 80% at 50% 50%, rgba(255, 184, 0, 0.07), transparent),
              radial-gradient(50% 80% at 50% 50%, rgba(0, 212, 255, 0.08), transparent);
}

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

.cta-band h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 10px;
}

.cta-band p {
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto 26px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 50px;
  padding: 0 36px;
  border-radius: var(--radius-sm);
  background: var(--gradient-btn);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  box-shadow: var(--shadow-btn);
  transition: var(--transition);
}

.cta-btn:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.5);
  transform: translateY(-2px);
}

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

.cta-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.3);
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-deeper);
  border-top: 1px solid transparent;
  background-image: linear-gradient(var(--bg-deeper), var(--bg-deeper)),
                    linear-gradient(90deg, transparent, var(--primary), transparent);
  background-size: 100% 100%, 100% 1px;
  background-position: 0 0, 0 0;
  background-repeat: no-repeat, no-repeat;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding: 56px 0 40px;
}

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

.footer-brand p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 300px;
}

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

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

.footer-col ul li a {
  font-size: 13px;
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-contact svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke: var(--primary);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 18px;
}

.footer-links a {
  font-size: 12px;
  color: var(--text-muted);
  transition: var(--transition);
}

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

/* ===== Focus States ===== */
a:focus-visible,
button:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.3);
  border-radius: 4px;
}

/* ===== Mobile Menu Panel ===== */
.mobile-panel {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: rgba(10, 14, 23, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 16px 24px 24px;
  border-bottom: 1px solid var(--border);
  z-index: 99;
}

.mobile-panel.open {
  display: block;
  animation: fadeDown 0.25s ease;
}

.mobile-panel a {
  display: block;
  padding: 14px 8px;
  font-size: 15px;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.mobile-panel a:last-child {
  border-bottom: none;
}

.mobile-panel a.active {
  color: var(--primary);
  border-left: 3px solid var(--primary);
  padding-left: 14px;
  font-weight: 600;
}

@keyframes fadeDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .burger {
    display: flex;
    margin-left: auto;
  }
  .page-hero {
    min-height: 240px;
    padding-top: calc(var(--header-h) + 32px);
    padding-bottom: 40px;
  }
  .section {
    padding: 56px 0;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .flow-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 520px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .container {
    padding: 0 16px;
  }
  .page-hero h1 {
    font-size: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== Hero Subtle Grid Decoration ===== */
.page-hero .hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  z-index: 1;
  pointer-events: none;
  mask-image: radial-gradient(60% 60% at 50% 40%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(60% 60% at 50% 40%, #000 30%, transparent 100%);
}

/* ===== Scroll Indicator ===== */
.scroll-indicator {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.3);
  font-size: 18px;
  z-index: 2;
  animation: bounceDown 2s infinite;
  transition: color 0.3s ease;
}

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

@keyframes bounceDown {
  0%, 100% {
    transform: translate(-50%, 0);
  }
  50% {
    transform: translate(-50%, 8px);
  }
}

/* roulang page: article */
:root {
  --bg: #0A0E17;
  --bg-2: #0F1625;
  --panel: #0C1322;
  --neon: #00D4FF;
  --neon-2: #7C8CFF;
  --warn: #FFB800;
  --text-1: #E8F0FF;
  --text-2: #9AA8C0;
  --text-3: #6B7A93;
  --border: rgba(255,255,255,0.08);
  --radius-lg: 20px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
  --glow: 0 0 20px rgba(0,212,255,0.4);
  --font-main: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-num: "Barlow Condensed", "DIN Alternate", "Arial Narrow", sans-serif;
  --transition: all .3s ease;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }

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

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 64px;
  background: rgba(6,10,18,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: box-shadow .3s ease;
}
.header.scrolled {
  box-shadow: 0 6px 28px rgba(0,0,0,0.35);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text-1);
  white-space: nowrap;
}
.logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--neon), var(--neon-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 0 16px rgba(0,212,255,0.5);
  flex-shrink: 0;
}
.logo-text {
  letter-spacing: 0.02em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav a {
  color: #B6C2D9;
  font-size: 14px;
  font-weight: 500;
  position: relative;
  padding: 6px 2px;
  transition: color .25s ease;
}
.main-nav a:hover { color: #fff; }
.main-nav a.active {
  color: #fff;
  text-shadow: 0 0 8px rgba(0,212,255,0.5);
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  border-radius: 2px;
}
.nav-cta {
  height: 36px;
  padding: 0 18px;
  border-radius: var(--radius-sm);
  border: none;
  background: linear-gradient(135deg, var(--neon), var(--neon-2));
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 0 16px rgba(0,212,255,0.3);
  transition: box-shadow .3s ease, transform .2s ease;
  white-space: nowrap;
}
.nav-cta:hover {
  box-shadow: 0 0 28px rgba(0,212,255,0.5);
  transform: translateY(-1px);
}
.nav-cta:active {
  transform: translateY(0);
}
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px;
}
.burger span {
  display: block;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform .3s ease, opacity .3s ease;
}
.burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Article Section ===== */
.article-section {
  position: relative;
  padding: 128px 0 64px;
  background:
    radial-gradient(50% 30% at 82% 6%, rgba(0,212,255,0.12), transparent 70%),
    var(--bg);
  overflow: hidden;
}
.article-section::before {
  content: '';
  position: absolute;
  top: 8%; left: -8%;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(0,212,255,0.07), transparent 70%);
  pointer-events: none;
}
.article-section::after {
  content: '';
  position: absolute;
  top: 42%; right: -8%;
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(124,140,255,0.06), transparent 70%);
  pointer-events: none;
}
.article-wrap {
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.breadcrumb {
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumb a {
  color: var(--text-3);
  transition: color .25s ease;
}
.breadcrumb a:hover { color: var(--neon); }
.breadcrumb .sep { opacity: 0.5; }
.breadcrumb .current {
  color: var(--text-2);
  max-width: 320px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.article-card {
  background: var(--panel);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  padding: 48px;
  border: 1px solid rgba(255,255,255,0.04);
  transition: box-shadow .3s ease;
}
.article-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.article-head {
  margin-bottom: 32px;
}
.article-cat {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--neon);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}
.article-head h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-1);
  letter-spacing: 0.01em;
  margin-bottom: 18px;
}
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--text-3);
}
.article-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
}

.article-body {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 28px;
}
.article-body > p:first-child {
  font-size: 18px;
  line-height: 1.8;
  color: #DCE7F5;
}
.article-body p {
  margin-bottom: 18px;
  line-height: 1.8;
  color: #C7D2E0;
  font-size: 16px;
}
.article-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-1);
  margin: 40px 0 16px;
  padding-left: 14px;
  border-left: 3px solid var(--neon);
  line-height: 1.4;
}
.article-body h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-1);
  margin: 28px 0 12px;
  line-height: 1.4;
}
.article-body ul,
.article-body ol {
  margin: 0 0 18px;
  padding-left: 22px;
  color: #C7D2E0;
  line-height: 1.8;
}
.article-body li {
  margin-bottom: 6px;
}
.article-body .lead {
  font-size: 18px;
  color: #DCE7F5;
}
.article-body img {
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  max-width: 100%;
  height: auto;
  margin: 24px 0;
}
.article-body a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color .25s ease;
}
.article-body a:hover { color: #7AE6FF; }
.article-body blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 3px solid var(--neon);
  background: rgba(0,212,255,0.05);
  border-radius: 0 10px 10px 0;
  color: #B6C2D9;
  font-size: 15px;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 15px;
}
.article-body th,
.article-body td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
  color: #C7D2E0;
}
.article-body th {
  background: rgba(255,255,255,0.04);
  font-weight: 600;
  color: var(--text-1);
}
.article-body code {
  background: rgba(0,212,255,0.08);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 14px;
  color: #7AE6FF;
}
.not-found {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-2);
  font-size: 16px;
}
.not-found a {
  color: var(--neon);
  text-decoration: underline;
  margin-left: 6px;
}

/* ===== Article CTA ===== */
.article-cta {
  margin-top: 32px;
  padding: 36px 32px;
  text-align: center;
  border-radius: var(--radius);
  background: rgba(0,212,255,0.03);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0,212,255,0.4);
  box-shadow: 0 0 0 1px rgba(0,212,255,0.2), 0 8px 32px rgba(0,212,255,0.1);
}
.article-cta .cta-line {
  display: block;
  font-size: 14px;
  color: var(--text-2);
  margin-bottom: 14px;
}
.article-cta .cta-link {
  display: inline-block;
  font-size: 20px;
  font-weight: 700;
  color: var(--neon);
  text-shadow: 0 0 12px rgba(0,212,255,0.5);
  padding: 8px 4px;
  transition: text-shadow .3s ease, color .3s ease;
}
.article-cta .cta-link:hover {
  color: #7AE6FF;
  text-shadow: 0 0 20px rgba(0,212,255,0.8);
}

/* ===== Post Nav ===== */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
}
.post-nav a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  transition: all .3s ease;
}
.post-nav a:hover {
  border-color: rgba(0,212,255,0.3);
  background: rgba(0,212,255,0.03);
  color: var(--text-1);
}
.post-nav .nav-label {
  font-size: 12px;
  color: var(--text-3);
  letter-spacing: 0.05em;
}
.post-nav .nav-title {
  font-size: 14px;
  color: var(--text-2);
  transition: color .3s ease;
}
.post-nav a:hover .nav-title { color: var(--neon); }
.post-nav .post-next {
  text-align: right;
}

/* ===== Related Section ===== */
.related-section {
  padding: 72px 0 96px;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
}
.section-head {
  text-align: center;
  margin-bottom: 44px;
}
.section-head h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 8px;
}
.section-head p {
  font-size: 15px;
  color: var(--text-2);
  max-width: 560px;
  margin: 0 auto;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.rel-card {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.rel-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,212,255,0.12);
  border-color: rgba(0,212,255,0.2);
}
.rel-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.rel-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.rel-card:hover .rel-thumb img {
  transform: scale(1.03);
}
.rel-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(6,10,18,0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--neon);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.rel-body {
  padding: 20px;
}
.rel-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.4;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .25s ease;
}
.rel-card:hover .rel-body h3 {
  color: #7AE6FF;
}
.rel-body p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}
.rel-foot {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-3);
}

/* ===== Buttons ===== */
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0,212,255,0.5);
  background: transparent;
  color: var(--neon);
  font-size: 14px;
  font-weight: 600;
  transition: all .3s ease;
}
.btn-ghost:hover {
  background: rgba(0,212,255,0.1);
  box-shadow: 0 0 20px rgba(0,212,255,0.15);
}
.btn-ghost:focus-visible,
.nav-cta:focus-visible,
.burger:focus-visible,
a:focus-visible,
button:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0,212,255,0.4);
}
.back-wrap {
  text-align: center;
  margin-top: 48px;
}

/* ===== Footer ===== */
.footer {
  background: #070A11;
  border-top: 1px solid transparent;
  background-image: linear-gradient(90deg, transparent, rgba(0,212,255,0.35), transparent);
  background-size: 100% 1px;
  background-position: top;
  background-repeat: no-repeat;
  padding-top: 56px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo {
  margin-bottom: 14px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 16px;
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul a {
  font-size: 14px;
  color: var(--text-2);
  transition: color .25s ease;
}
.footer-col ul a:hover { color: var(--neon); }
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-2);
}
.footer-contact svg {
  width: 16px;
  height: 16px;
  stroke: var(--neon);
  flex-shrink: 0;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
  font-size: 12px;
  color: #5C6B84;
}
.footer-bottom p { margin: 0; }
.footer-links {
  display: flex;
  gap: 18px;
}
.footer-links a {
  color: #5C6B84;
  transition: color .25s ease;
}
.footer-links a:hover { color: var(--neon); }

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .header-inner {
    gap: 8px;
  }
  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10,14,23,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px;
    gap: 6px;
    border-bottom: 1px solid rgba(0,212,255,0.15);
    display: none;
    box-shadow: 0 16px 40px rgba(0,0,0,0.4);
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav a {
    display: block;
    width: 100%;
    padding: 12px 8px;
    font-size: 15px;
    border-radius: 8px;
  }
  .main-nav a.active {
    background: rgba(0,212,255,0.06);
    border-left: 3px solid var(--neon);
    padding-left: 10px;
  }
  .main-nav a.active::after {
    display: none;
  }
  .burger {
    display: flex;
  }
  .nav-cta {
    display: none;
  }
  .article-section {
    padding: 100px 0 48px;
  }
  .article-card {
    padding: 28px 20px;
    border-radius: var(--radius);
  }
  .article-head h1 {
    font-size: 26px;
    line-height: 1.35;
  }
  .article-body p {
    font-size: 15px;
  }
  .article-body > p:first-child {
    font-size: 17px;
  }
  .article-cta {
    padding: 28px 20px;
  }
  .article-cta .cta-link {
    font-size: 18px;
  }
  .post-nav {
    grid-template-columns: 1fr;
  }
  .post-nav .post-next {
    text-align: left;
  }
  .related-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .related-section {
    padding: 56px 0 72px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }
  .logo-text {
    font-size: 16px;
  }
  .article-meta {
    font-size: 12px;
  }
  .breadcrumb .current {
    max-width: 180px;
  }
}

/* roulang page: category2 */
:root {
  --bg-primary: #0A0E17;
  --bg-panel: #0C1322;
  --bg-footer: #070A11;
  --neon: #00D4FF;
  --neon-secondary: #7C8CFF;
  --warn: #FFB800;
  --text-main: #E8F0FF;
  --text-sub: #9AA8C0;
  --text-weak: #6B7A93;
  --border: rgba(255,255,255,0.08);
  --glass-bg: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.1);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 0 1px rgba(0,212,255,0.2), 0 8px 32px rgba(0,212,255,0.1);
  --font-cn: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-num: "Barlow Condensed", "DIN Alternate", "Arial Narrow", sans-serif;
  --spacing-section: 96px;
  --spacing-section-mb: 56px;
  --container-max: 1200px;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-cn);
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
a {
  color: var(--neon);
  text-decoration: none;
  transition: color .2s;
}
img {
  max-width: 100%;
  display: block;
}
button {
  font-family: inherit;
  border: none;
  cursor: pointer;
}
ul, ol {
  list-style: none;
}
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0,212,255,0.35);
  border-radius: 6px;
}

/* ===== 按钮 ===== */
.btn {
  min-height: 44px;
  padding: 0 26px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  transition: all .25s ease;
  font-family: var(--font-cn);
  line-height: 1;
}
.btn-primary {
  background: linear-gradient(135deg, #00D4FF, #7C8CFF);
  color: #081018;
  box-shadow: 0 0 20px rgba(0,212,255,0.35);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 28px rgba(0,212,255,0.5);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 0 16px rgba(0,212,255,0.3);
}
.btn-ghost {
  background: transparent;
  border: 1px solid rgba(0,212,255,0.5);
  color: var(--neon);
}
.btn-ghost:hover {
  background: rgba(0,212,255,0.1);
  box-shadow: 0 0 18px rgba(0,212,255,0.2);
}
.btn-ghost:active {
  background: rgba(0,212,255,0.18);
}
.btn-lg {
  min-height: 52px;
  padding: 0 36px;
  font-size: 16px;
}

/* ===== 区块标题 ===== */
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}
.section-tag {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--neon);
  border: 1px solid rgba(0,212,255,0.3);
  background: rgba(0,212,255,0.06);
}
.section-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  color: var(--text-main);
  margin: 16px 0 10px;
  line-height: 1.3;
}
.section-sub {
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.7;
}

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 64px;
  background: rgba(6,10,18,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  height: 64px;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00D4FF, #7C8CFF);
  color: #081018;
  font-weight: 800;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(0,212,255,0.45);
  font-family: var(--font-num);
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  letter-spacing: .01em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: 16px;
}
.main-nav a {
  color: #B6C2D9;
  font-size: 14px;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
  transition: color .2s;
}
.main-nav a:hover {
  color: #fff;
}
.main-nav a.active {
  color: #fff;
  font-weight: 600;
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #00D4FF, transparent);
  border-radius: 2px;
  box-shadow: 0 0 10px rgba(0,212,255,0.7);
}
.nav-cta {
  margin-left: auto;
  min-height: 38px;
  padding: 0 20px;
  border-radius: 10px;
  background: linear-gradient(135deg, #00D4FF, #7C8CFF);
  color: #081018;
  font-size: 14px;
  font-weight: 700;
  transition: all .25s;
  box-shadow: 0 0 16px rgba(0,212,255,0.3);
  flex-shrink: 0;
}
.nav-cta:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 26px rgba(0,212,255,0.5);
  transform: translateY(-1px);
}
.burger {
  display: none;
  width: 42px;
  height: 42px;
  background: transparent;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 1px solid rgba(255,255,255,0.14);
  flex-shrink: 0;
}
.burger span {
  display: block;
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .3s, opacity .3s;
}
.burger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.burger.active span:nth-child(2) {
  opacity: 0;
}
.burger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 48px;
  background:
    linear-gradient(180deg, rgba(11,15,30,0.72), rgba(10,14,23,0.94)),
    url('/assets/images/backpic/back-2.webp') center / cover no-repeat;
}
.page-hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 260px;
  background-image:
    linear-gradient(rgba(0,212,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.06) 1px, transparent 1px);
  background-size: 42px 42px;
  opacity: .5;
  pointer-events: none;
  mask-image: linear-gradient(180deg, #000, transparent);
}
.page-hero-inner {
  position: relative;
  z-index: 2;
}
.page-hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  color: var(--text-main);
  text-shadow: 0 0 24px rgba(0,212,255,0.28);
  line-height: 1.25;
}
.page-hero .lead {
  max-width: 600px;
  margin: 16px auto 0;
  color: var(--text-sub);
  font-size: 16px;
  line-height: 1.8;
}
.page-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

/* ===== Shield Grid ===== */
.sec-shield {
  padding: var(--spacing-section) 0;
  background: linear-gradient(180deg, var(--bg-primary), #0F1625);
}
.shield-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.shield-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  text-align: center;
  transition: transform .3s, box-shadow .3s;
}
.shield-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 36px rgba(0,212,255,0.12);
}
.shield-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  border-radius: 16px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neon);
}
.shield-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 10px;
}
.shield-card p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ===== Protect Cards ===== */
.sec-protect {
  padding: var(--spacing-section) 0;
  background: var(--bg-primary);
}
.protect-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.protect-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: transform .3s, box-shadow .3s;
}
.protect-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 36px rgba(0,212,255,0.12);
}
.protect-media {
  height: 220px;
  overflow: hidden;
  position: relative;
}
.protect-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s;
}
.protect-card:hover .protect-media img {
  transform: scale(1.04);
}
.protect-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(12,19,34,0.8));
}
.protect-body {
  padding: 28px 28px 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--neon);
  border: 1px solid rgba(0,212,255,0.3);
  background: rgba(0,212,255,0.06);
  margin-bottom: 14px;
}
.protect-body h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}
.protect-body p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ===== Flow ===== */
.sec-flow {
  padding: var(--spacing-section) 0;
  background: linear-gradient(180deg, #0F1625, var(--bg-primary));
}
.flow-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.flow-step {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px 28px;
  text-align: center;
  transition: transform .3s, box-shadow .3s;
}
.flow-step:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 0 1px rgba(0,212,255,0.2), 0 10px 34px rgba(0,212,255,0.1);
}
.flow-step::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -17px;
  width: 18px;
  height: 2px;
  background: linear-gradient(90deg, rgba(0,212,255,0.7), rgba(124,140,255,0.2));
  transform: translateY(-50%);
}
.flow-step:last-child::after {
  display: none;
}
.flow-num {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 38px;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(0,212,255,0.6);
  line-height: 1;
  margin-bottom: 16px;
}
.flow-step h3 {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 10px;
}
.flow-step p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ===== Scenes ===== */
.sec-scenes {
  padding: var(--spacing-section) 0;
  background: var(--bg-primary);
}
.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.scene-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .3s, box-shadow .3s;
}
.scene-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 36px rgba(0,212,255,0.12);
}
.scene-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.scene-body {
  padding: 24px;
}
.scene-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 10px;
}
.scene-body p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
}

/* ===== FAQ ===== */
.sec-faq {
  padding: var(--spacing-section) 0;
  background: linear-gradient(180deg, var(--bg-primary), #0F1625);
}
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-left: 3px solid transparent;
  border-radius: var(--radius-lg);
  transition: border-color .3s, box-shadow .3s;
  overflow: hidden;
}
.faq-item.open {
  border-left-color: var(--neon);
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
}
.faq-item h3 {
  margin: 0;
}
.faq-item h3 button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  background: transparent;
  color: var(--text-main);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  font-family: var(--font-cn);
  transition: color .2s;
}
.faq-item h3 button:hover {
  color: #fff;
}
.faq-icon {
  width: 24px;
  height: 24px;
  flex: none;
  position: relative;
}
.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  background: var(--neon);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0,212,255,0.4);
}
.faq-icon::before {
  left: 4px;
  right: 4px;
  top: 11px;
  height: 2px;
}
.faq-icon::after {
  top: 4px;
  bottom: 4px;
  left: 11px;
  width: 2px;
  transition: transform .3s;
}
.faq-item.open .faq-icon::after {
  transform: scaleY(0);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
  padding: 0 26px;
}
.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 26px 22px;
}
.faq-answer p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  max-width: 720px;
}

/* ===== CTA Banner ===== */
.cta-banner {
  padding: 72px 24px;
  text-align: center;
  background:
    radial-gradient(50% 60% at 50% 30%, rgba(255,184,0,0.07), transparent),
    radial-gradient(50% 60% at 50% 70%, rgba(0,212,255,0.08), transparent),
    var(--bg-primary);
  border-top: 1px solid rgba(0,212,255,0.12);
  border-bottom: 1px solid rgba(0,212,255,0.12);
}
.cta-banner h2 {
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  color: #fff;
}
.cta-banner p {
  color: var(--text-sub);
  margin: 12px 0 26px;
  font-size: 15px;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-footer);
  position: relative;
  padding-top: 64px;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.5), transparent);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer .logo {
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 13px;
  color: var(--text-weak);
  line-height: 1.8;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul a {
  font-size: 14px;
  color: var(--text-sub);
  transition: color .2s;
}
.footer-col ul a:hover {
  color: var(--neon);
}
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-sub);
}
.footer-contact svg {
  width: 16px;
  height: 16px;
  color: var(--neon);
  flex: none;
  opacity: .85;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom p {
  font-size: 12px;
  color: #5C6B84;
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: 12px;
  color: #5C6B84;
  transition: color .2s;
}
.footer-links a:hover {
  color: var(--neon);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  :root {
    --spacing-section: 72px;
  }
  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10,14,23,0.95);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
    margin-left: 0;
    z-index: 90;
    display: none;
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav a {
    font-size: 20px;
    color: var(--text-main);
  }
  .main-nav a.active::after {
    bottom: -6px;
  }
  .burger {
    display: flex;
    margin-left: auto;
  }
  .nav-cta {
    display: none;
  }
  .shield-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .flow-step::after {
    display: none;
  }
  .scene-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  :root {
    --spacing-section: 56px;
  }
  .protect-grid {
    grid-template-columns: 1fr;
  }
  .scene-grid {
    grid-template-columns: 1fr;
  }
  .page-hero {
    min-height: 240px;
    padding: 100px 20px 40px;
  }
  .page-actions {
    flex-direction: column;
    align-items: stretch;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
  }
  .section-head {
    margin-bottom: 36px;
  }
}
@media (max-width: 520px) {
  .logo-text {
    font-size: 15px;
  }
  .logo-icon {
    width: 26px;
    height: 26px;
    font-size: 14px;
  }
  .header-inner {
    gap: 12px;
  }
  .page-hero h1 {
    font-size: 25px;
  }
  .page-hero .lead {
    font-size: 14px;
  }
  .shield-grid {
    grid-template-columns: 1fr;
  }
  .flow-list {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
  }
  .cta-banner {
    padding: 56px 20px;
  }
  .btn-lg {
    width: 100%;
  }
}

/* roulang page: category3 */
:root {
  --bg-primary: #0A0E17;
  --bg-panel: #0C1322;
  --bg-deep: #070A11;
  --neon-cyan: #00D4FF;
  --neon-secondary: #7C8CFF;
  --warn-gold: #FFB800;
  --text-primary: #E8F0FF;
  --text-secondary: #9AA8C0;
  --text-muted: #6B7A93;
  --border-white: rgba(255,255,255,0.08);
  --border-cyan: rgba(0,212,255,0.4);
  --radius-card: 16px;
  --radius-sm: 10px;
  --radius-tag: 999px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.4);
  --glow-btn: 0 0 20px rgba(0,212,255,0.4);
  --glow-btn-hover: 0 0 28px rgba(0,212,255,0.5);
  --glow-card: 0 0 0 1px rgba(0,212,255,0.2), 0 8px 32px rgba(0,212,255,0.1);
  --font-cn: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-num: "Barlow Condensed", "DIN Alternate", "Arial Narrow", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
body.no-scroll { overflow: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header & Nav ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 64px;
  background: rgba(6,10,18,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-icon {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 0 18px rgba(0,212,255,0.4);
  font-family: var(--font-num);
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav a {
  position: relative;
  font-size: 15px;
  font-weight: 500;
  color: #B6C2D9;
  padding: 6px 2px;
  transition: color 0.2s ease;
}
.main-nav a:hover { color: #fff; }
.main-nav a.active {
  color: #fff;
  text-shadow: 0 0 8px rgba(0,212,255,0.5);
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  box-shadow: 0 0 8px rgba(0,212,255,0.6);
}
.nav-cta {
  height: 40px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-secondary));
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--glow-btn);
  transition: all 0.25s ease;
  flex-shrink: 0;
}
.nav-cta:hover {
  box-shadow: var(--glow-btn-hover);
  filter: brightness(1.1);
  transform: translateY(-1px);
}
.nav-cta:active { transform: translateY(1px); box-shadow: 0 0 12px rgba(0,212,255,0.3); }
.burger {
  display: none;
  width: 40px; height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 8px;
  border: 1px solid var(--border-white);
  background: rgba(255,255,255,0.04);
}
.burger span {
  display: block;
  width: 20px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Category Hero ===== */
.category-hero {
  position: relative;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 0 80px;
  background: linear-gradient(180deg, #0B0F1E 0%, rgba(11,15,30,0.7) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  overflow: hidden;
}
.category-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(180deg, rgba(10,14,23,0.6) 0%, rgba(10,14,23,0.85) 100%);
}
.category-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.3), transparent);
}
.category-hero .container { position: relative; z-index: 2; }
.breadcrumb {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.breadcrumb a { color: var(--text-muted); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--neon-cyan); }
.breadcrumb span { color: var(--text-secondary); }
.category-hero h1 {
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 14px;
  text-shadow: 0 0 20px rgba(0,212,255,0.25);
  letter-spacing: 0.02em;
}
.category-hero .hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== Anchor Nav ===== */
.anchor-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: -20px;
  position: relative;
  z-index: 3;
  padding-bottom: 20px;
}
.anchor-nav a {
  display: inline-block;
  padding: 8px 22px;
  border-radius: var(--radius-tag);
  border: 1px solid var(--border-white);
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-size: 14px;
  color: var(--text-secondary);
  transition: all 0.25s ease;
}
.anchor-nav a:hover {
  color: var(--neon-cyan);
  border-color: var(--border-cyan);
  box-shadow: 0 0 12px rgba(0,212,255,0.15);
}
.anchor-nav a.active {
  color: #fff;
  border-color: var(--neon-cyan);
  background: rgba(0,212,255,0.1);
  box-shadow: 0 0 12px rgba(0,212,255,0.2);
}

/* ===== Section Common ===== */
.section { padding: 80px 0; position: relative; }
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}
.section-head h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}
.section-head p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
}
.divider {
  width: 56px;
  height: 3px;
  margin: 16px auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-secondary));
}

/* ===== Overview Section ===== */
.overview-section { background: linear-gradient(180deg, var(--bg-primary) 0%, #0F1625 100%); }
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.overview-text h2 {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  margin-bottom: 16px;
}
.overview-text .lead {
  font-size: 18px;
  color: #C7D2E0;
  line-height: 1.8;
  margin-bottom: 16px;
}
.overview-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.8;
}
.overview-list { margin-top: 20px; }
.overview-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 15px;
}
.overview-list li::before {
  content: '';
  flex-shrink: 0;
  width: 20px; height: 20px;
  margin-top: 3px;
  border-radius: 50%;
  background: rgba(0,212,255,0.12);
  border: 1px solid rgba(0,212,255,0.4);
  position: relative;
}
.overview-list li::after {
  content: '✓';
  position: absolute;
  font-size: 11px;
  color: var(--neon-cyan);
  margin-left: -16px;
  margin-top: 1px;
}
.overview-image {
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border-white);
  box-shadow: var(--shadow-glass);
  position: relative;
}
.overview-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(10,14,23,0.6) 100%);
}
.overview-image img { width: 100%; height: 100%; object-fit: cover; }

/* ===== Service Cards ===== */
.support-section { background: var(--bg-panel); }
.service-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-white);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glow-card);
  border-color: rgba(0,212,255,0.3);
}
.service-card .card-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,140,255,0.15));
  border: 1px solid rgba(0,212,255,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.service-card .card-icon svg { width: 26px; height: 26px; stroke: var(--neon-cyan); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.service-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}
.service-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  flex-grow: 1;
}
.service-card .card-link {
  margin-top: 18px;
  color: var(--neon-cyan);
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
}
.service-card .card-link:hover { gap: 10px; }
.service-card .card-link svg { width: 15px; height: 15px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ===== Process Steps ===== */
.process-section { background: linear-gradient(180deg, #0F1625 0%, var(--bg-primary) 100%); }
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.process-step {
  position: relative;
  text-align: center;
  padding: 36px 20px 28px;
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-white);
  border-radius: var(--radius-card);
  transition: all 0.3s ease;
}
.process-step:hover {
  border-color: rgba(0,212,255,0.4);
  box-shadow: var(--glow-card);
  transform: translateY(-3px);
}
.process-step .step-num {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-secondary));
  color: #fff;
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(0,212,255,0.4);
}
.process-step h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 14px 0 8px;
}
.process-step p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}
.step-arrow {
  position: absolute;
  right: -20px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(0,212,255,0.5);
  font-size: 18px;
  z-index: 2;
  pointer-events: none;
}

/* ===== Related Cards ===== */
.related-section { background: var(--bg-panel); }
.related-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border-white);
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glow-card);
  border-color: rgba(0,212,255,0.3);
}
.related-card .img-box {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.related-card .img-box img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.related-card:hover .img-box img { transform: scale(1.05); }
.related-card .img-box::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10,14,23,0.7) 100%);
}
.related-card .card-body { padding: 20px; }
.related-card .tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--neon-cyan);
  background: rgba(0,212,255,0.1);
  border-radius: var(--radius-tag);
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}
.related-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-card .card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-top: 1px solid var(--border-white);
  font-size: 12px;
  color: var(--text-muted);
}
.related-card .card-meta span { display: flex; align-items: center; gap: 6px; }
.related-card .card-meta svg { width: 13px; height: 13px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ===== CTA Bar ===== */
.cta-bar {
  position: relative;
  padding: 72px 0;
  text-align: center;
  background: var(--bg-primary);
  overflow: hidden;
}
.cta-bar::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(50% 60% at 30% 50%, rgba(0,212,255,0.1), transparent),
    radial-gradient(50% 60% at 70% 50%, rgba(124,140,255,0.08), transparent);
}
.cta-bar .container { position: relative; z-index: 2; }
.cta-bar h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 12px;
}
.cta-bar p {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 28px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-secondary));
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  box-shadow: var(--glow-btn);
  transition: all 0.25s ease;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
.btn-primary:hover {
  box-shadow: var(--glow-btn-hover);
  filter: brightness(1.1);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(1px) scale(0.98); box-shadow: 0 0 14px rgba(0,212,255,0.35); }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 32px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0,212,255,0.5);
  color: var(--neon-cyan);
  font-size: 15px;
  font-weight: 500;
  background: transparent;
  transition: all 0.25s ease;
}
.btn-ghost:hover {
  background: rgba(0,212,255,0.1);
  box-shadow: 0 0 16px rgba(0,212,255,0.15);
}

/* ===== FAQ ===== */
.faq-section { background: linear-gradient(180deg, var(--bg-primary) 0%, #0F1625 100%); }
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-white);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.faq-item.active {
  border-left: 3px solid var(--neon-cyan);
  box-shadow: 0 8px 24px rgba(0,212,255,0.08);
}
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.2s ease;
}
.faq-q:hover { color: var(--neon-cyan); }
.faq-q .icon {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 1px solid rgba(0,212,255,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 300;
  color: var(--neon-cyan);
  transition: transform 0.3s ease;
  line-height: 1;
}
.faq-item.active .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}
.faq-item.active .faq-a {
  max-height: 300px;
  padding: 0 24px 20px;
}
.faq-a p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
  max-width: 680px;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-deep);
  border-top: 1px solid transparent;
  position: relative;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  opacity: 0.5;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding: 56px 0 40px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 18px;
  color: var(--text-primary);
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a {
  color: var(--text-muted);
  font-size: 14px;
  transition: color 0.2s ease;
}
.footer-col ul a:hover { color: var(--neon-cyan); }
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 14px;
}
.footer-contact svg {
  width: 16px; height: 16px;
  stroke: var(--neon-cyan);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom p {
  color: #5C6B84;
  font-size: 13px;
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  color: #5C6B84;
  font-size: 13px;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--neon-cyan); }

/* ===== Focus Visible ===== */
a:focus-visible, button:focus-visible, .faq-q:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0,212,255,0.3);
  border-radius: 4px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .overview-grid { grid-template-columns: 1fr; gap: 32px; }
  .service-cards { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); gap: 32px 20px; }
  .step-arrow { display: none; }
  .related-cards { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
}
@media (max-width: 767px) {
  .header-inner { padding: 0 16px; }
  .main-nav {
    position: fixed;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: rgba(10,14,23,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 20px 16px;
    gap: 4px;
    border-bottom: 1px solid rgba(0,212,255,0.15);
    transform: translateY(-20px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 999;
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .main-nav a {
    display: block;
    width: 100%;
    padding: 14px 12px;
    border-left: 2px solid transparent;
    font-size: 16px;
    border-radius: 6px;
  }
  .main-nav a.active {
    background: rgba(0,212,255,0.06);
    border-left-color: var(--neon-cyan);
  }
  .main-nav a.active::after { display: none; }
  .nav-cta { display: none; }
  .burger { display: flex; }
  .category-hero { min-height: 220px; padding: 100px 0 60px; }
  .category-hero h1 { font-size: 26px; line-height: 1.3; }
  .category-hero .hero-subtitle { font-size: 15px; }
  .anchor-nav { gap: 8px; }
  .anchor-nav a { padding: 7px 16px; font-size: 13px; }
  .section { padding: 56px 0; }
  .service-cards { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: 1fr; }
  .related-cards { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; padding: 40px 0 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-links { flex-wrap: wrap; gap: 12px; }
  .btn-primary { width: 100%; max-width: 320px; }
  .btn-ghost { width: 100%; max-width: 320px; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .logo-text { font-size: 15px; }
  .category-hero h1 { font-size: 23px; }
  .section-head h2 { font-size: 22px; }
  .overview-text .lead { font-size: 16px; }
}

/* ===== A11y ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}