/* roulang page: index */
:root {
  --bg-dark: #070712;
  --bg-panel: #0e0e1e;
  --bg-card: #141428;
  --border: #252540;
  --text-main: #e2e8f0;
  --text-weak: #94a3b8;
  --primary: #8b5cf6;
  --primary-light: #a78bfa;
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --glow: 0 0 32px rgba(139, 92, 246, 0.32);
  --glow-accent: 0 0 32px rgba(6, 182, 212, 0.25);
  --space-section: 108px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input {
  font-family: inherit;
}

::selection {
  background: rgba(139, 92, 246, 0.35);
  color: #fff;
}

.container {
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.35);
  color: var(--primary-light);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #f8fafc 30%, var(--primary-light) 70%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  color: var(--text-weak);
  font-size: 1.05rem;
  margin-top: 14px;
  line-height: 1.8;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: all 0.3s ease;
  white-space: nowrap;
  line-height: 1.4;
}

.btn-primary {
  background: linear-gradient(135deg, #7c3aed, #6d28d9);
  color: #fff;
  box-shadow: var(--glow);
  border: 1px solid rgba(139, 92, 246, 0.5);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 42px rgba(139, 92, 246, 0.5);
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  color: #fff;
}

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

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  box-shadow: var(--glow-accent);
  transform: translateY(-2px);
}

.btn-accent {
  background: linear-gradient(135deg, #0891b2, #06b6d4);
  color: #fff;
  box-shadow: var(--glow-accent);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(6, 182, 212, 0.4);
  color: #fff;
}

.btn-sm {
  padding: 9px 22px;
  font-size: 14px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 7, 18, 0.86);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 20px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-mark {
  color: var(--primary-light);
  font-size: 1.45rem;
  text-shadow: 0 0 18px rgba(139, 92, 246, 0.5);
}

.logo-text {
  color: #fff;
}

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

.nav-link {
  position: relative;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-weak);
}

.nav-link:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.active {
  color: var(--primary-light);
  text-shadow: 0 0 16px rgba(139, 92, 246, 0.4);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 22px;
  height: 2px;
  border-radius: 999px;
  background: var(--primary);
  box-shadow: 0 0 12px var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: transform 0.3s ease;
}

.hero {
  position: relative;
  overflow: hidden;
  background-image: linear-gradient(180deg, rgba(7, 7, 18, 0.25), rgba(7, 7, 18, 0.92)), url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  padding: 140px 0 120px;
}

.hero::before {
  content: "";
  position: absolute;
  top: -20%;
  left: 10%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.28), transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -10%;
  right: 5%;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.18), transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  max-width: 640px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(139, 92, 246, 0.14);
  border: 1px solid rgba(139, 92, 246, 0.35);
  color: var(--primary-light);
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.15);
}

.hero h1 {
  font-size: clamp(3rem, 7vw, 4.8rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #fff 30%, var(--primary-light) 70%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  margin-top: 24px;
  font-size: 1.15rem;
  color: #cbd5e1;
  line-height: 1.9;
  max-width: 540px;
}

.hero-actions {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 48px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-point {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-point strong {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-light), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-point span {
  font-size: 13px;
  color: var(--text-weak);
}

.hero-card {
  position: relative;
  border-radius: var(--radius);
  background: rgba(20, 20, 40, 0.7);
  border: 1px solid rgba(139, 92, 246, 0.3);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  padding: 24px;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.5), transparent 40%, rgba(6, 182, 212, 0.4));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.hero-card-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-card-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.hero-card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  background: rgba(139, 92, 246, 0.18);
  color: var(--primary-light);
}

.hero-card-item:nth-child(2) .hero-card-icon {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-light);
}

.hero-card-item:nth-child(3) .hero-card-icon {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
}

.hero-card-item strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.hero-card-item span {
  font-size: 13px;
  color: var(--text-weak);
}

.feature-card {
  background: rgba(20, 20, 40, 0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
  height: 100%;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.45);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: rgba(139, 92, 246, 0.16);
  color: var(--primary-light);
  margin-bottom: 20px;
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.feature-card:nth-child(2) .feature-icon {
  background: rgba(6, 182, 212, 0.14);
  color: var(--accent-light);
  border-color: rgba(6, 182, 212, 0.25);
}

.feature-card:nth-child(3) .feature-icon {
  background: rgba(16, 185, 129, 0.14);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.25);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #f1f5f9;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.8;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.category-card {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(20, 20, 40, 0.7);
  border: 1px solid var(--border);
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.category-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.5);
  box-shadow: var(--shadow);
}

.category-media {
  aspect-ratio: 16 / 8;
  overflow: hidden;
  position: relative;
}

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

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

.category-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(7, 7, 18, 0.7) 100%);
}

.category-body {
  padding: 26px 28px 30px;
}

.category-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.14);
  color: var(--primary-light);
  border: 1px solid rgba(139, 92, 246, 0.3);
  margin-bottom: 14px;
}

.category-card:nth-child(2) .category-tag {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-light);
  border-color: rgba(6, 182, 212, 0.3);
}

.category-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #f8fafc;
  margin-bottom: 10px;
}

.category-body p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.8;
}

.category-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-light);
}

.category-card:nth-child(2) .category-link {
  color: var(--accent-light);
}

.news-section {
  background: linear-gradient(180deg, transparent, rgba(139, 92, 246, 0.05), transparent);
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.news-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 28px;
  border-radius: var(--radius-sm);
  background: rgba(20, 20, 40, 0.65);
  border: 1px solid var(--border);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.news-item:hover {
  border-color: rgba(139, 92, 246, 0.4);
  background: rgba(30, 30, 55, 0.8);
  transform: translateX(6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.news-item-main {
  flex: 1;
  min-width: 0;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.news-cat {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.14);
  color: var(--primary-light);
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.news-meta time {
  font-size: 13px;
  color: var(--text-weak);
}

.news-item h3 {
  font-size: 1.08rem;
  font-weight: 600;
  color: #f1f5f9;
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.news-item p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-arrow {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  font-size: 18px;
  color: var(--primary-light);
  transition: all 0.3s ease;
}

.news-item:hover .news-arrow {
  background: rgba(139, 92, 246, 0.2);
  border-color: rgba(139, 92, 246, 0.5);
  transform: translateX(4px);
}

.news-empty {
  padding: 60px 24px;
  text-align: center;
  border-radius: var(--radius);
  border: 1px dashed var(--border);
  color: var(--text-weak);
  font-size: 15px;
  background: rgba(20, 20, 40, 0.4);
}

.stats-section {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(6, 182, 212, 0.06));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  text-align: center;
}

.stat-item {
  padding: 20px 10px;
}

.stat-item strong {
  display: block;
  font-size: 2.6rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-light), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-item span {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-weak);
}

.path-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.path-section .section-head {
  text-align: left;
  margin-bottom: 36px;
}

.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  opacity: 0.5;
}

.timeline-item {
  position: relative;
  padding-bottom: 30px;
}

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

.timeline-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 2px solid var(--primary);
  box-shadow: 0 0 14px rgba(139, 92, 246, 0.5);
}

.timeline-item:nth-child(2)::before {
  border-color: var(--accent);
  box-shadow: 0 0 14px rgba(6, 182, 212, 0.4);
}

.timeline-item:nth-child(3)::before {
  border-color: #10b981;
  box-shadow: 0 0 14px rgba(16, 185, 129, 0.4);
}

.timeline-index {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--primary-light);
  opacity: 0.8;
}

.timeline-item:nth-child(2) .timeline-index {
  color: var(--accent-light);
}

.timeline-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 6px 0 4px;
  color: #f1f5f9;
}

.timeline-item p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
}

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

.path-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), transparent 50%);
}

.path-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.faq-list {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border-radius: var(--radius-sm);
  background: rgba(20, 20, 40, 0.65);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(139, 92, 246, 0.35);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 15px;
  font-weight: 600;
  color: #e2e8f0;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: var(--primary-light);
  font-size: 18px;
  font-weight: 500;
  flex-shrink: 0;
  transition: transform 0.3s ease, background 0.3s ease;
}

.faq-item details[open] summary::after {
  transform: rotate(45deg);
  background: rgba(139, 92, 246, 0.25);
}

.faq-item p {
  padding: 0 24px 22px;
  color: var(--text-weak);
  font-size: 14px;
  line-height: 1.8;
}

.cta-section {
  position: relative;
  overflow: hidden;
  padding: 110px 0;
  background-image: linear-gradient(180deg, rgba(7, 7, 18, 0.7), rgba(7, 7, 18, 0.85)), url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  border-top: 1px solid var(--border);
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(139, 92, 246, 0.2), transparent 70%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 800;
  line-height: 1.3;
  color: #fff;
  letter-spacing: -0.02em;
}

.cta-inner p {
  margin-top: 18px;
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.8;
}

.cta-actions {
  margin-top: 34px;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer {
  background: #050510;
  border-top: 1px solid var(--border);
  padding-top: 70px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
  gap: 44px;
  padding-bottom: 50px;
}

.footer-brand p {
  margin-top: 14px;
  color: var(--text-weak);
  font-size: 14px;
  line-height: 1.8;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 15px;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 18px;
}

.footer-links a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--text-weak);
}

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

.footer-info p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.8;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  text-align: center;
  color: var(--text-weak);
  font-size: 13px;
}

.footer-bottom a {
  color: var(--text-weak);
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (max-width: 1024px) {
  .container {
    padding: 0 28px;
  }

  .hero-inner {
    grid-template-columns: 1fr 0.8fr;
    gap: 40px;
  }

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

  .path-media {
    order: -1;
    max-width: 560px;
    margin: 0 auto;
  }

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

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .header-inner {
    height: 68px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    background: rgba(7, 7, 18, 0.96);
    border-bottom: 1px solid var(--border);
    padding: 18px 20px;
    backdrop-filter: blur(20px);
  }

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

  .nav-link {
    display: block;
    padding: 12px 18px;
  }

  .nav-link.active::after {
    display: none;
  }

  .nav-link.active {
    background: rgba(139, 92, 246, 0.14);
  }

  .nav-toggle {
    display: flex;
  }

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

  .hero {
    padding: 100px 0 84px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 480px;
  }

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

  .news-item {
    padding: 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .news-item:hover {
    transform: none;
  }

  .news-item h3 {
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
  }

  .news-arrow {
    display: none;
  }

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

@media (max-width: 520px) {
  .container {
    padding: 0 20px;
  }

  .section {
    padding: 60px 0;
  }

  .hero {
    padding: 84px 0 68px;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .hero-points {
    gap: 18px;
    flex-direction: column;
  }

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

  .stat-item strong {
    font-size: 2.2rem;
  }

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

  .faq-item summary {
    padding: 16px 18px;
    font-size: 14px;
  }

  .faq-item p {
    padding: 0 18px 18px;
  }
}

/* roulang page: category1 */
:root {
      --color-primary: #6d5dfc;
      --color-primary-light: #8b7cff;
      --color-primary-dark: #4a3fd4;
      --color-accent: #00d4aa;
      --color-accent-light: #4ff2d0;
      --color-bg: #0a0e1a;
      --color-bg-alt: #111827;
      --color-surface: #1a2130;
      --color-surface-hover: #232b3d;
      --color-text: #e8ecf4;
      --color-text-muted: #9aa5b8;
      --color-border: rgba(148, 163, 184, 0.15);
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-full: 999px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
      --shadow-glow: 0 0 24px rgba(109, 93, 252, 0.35);
      --space-section: 80px;
      --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    html {
      scroll-behavior: smooth;
    }

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

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

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

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.25s ease;
    }

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

    input,
    textarea {
      font-family: inherit;
    }

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

    /* ===== Header ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 14, 26, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--color-border);
      box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    }

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

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

    .logo-mark {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: linear-gradient(135deg, #6d5dfc 0%, #00d4aa 100%);
      color: #fff;
      font-size: 15px;
      font-weight: 800;
      letter-spacing: -0.5px;
      box-shadow: 0 0 18px rgba(109, 93, 252, 0.45);
    }

    .logo-text {
      font-size: 18px;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--color-text);
    }

    .logo:hover .logo-mark {
      box-shadow: 0 0 28px rgba(109, 93, 252, 0.65);
    }

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

    .nav-link {
      position: relative;
      padding: 8px 16px;
      font-size: 15px;
      font-weight: 500;
      color: var(--color-text-muted);
      border-radius: var(--radius-full);
      transition: color 0.25s ease, background 0.25s ease, text-shadow 0.25s ease;
    }

    .nav-link:hover {
      color: var(--color-text);
      background: rgba(109, 93, 252, 0.1);
    }

    .nav-link.active {
      color: #fff;
      background: rgba(109, 93, 252, 0.16);
      text-shadow: 0 0 12px rgba(109, 93, 252, 0.7);
      box-shadow: inset 0 -2px 0 var(--color-primary-light), 0 0 12px rgba(109, 93, 252, 0.25);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      border-radius: var(--radius-full);
      transition: all 0.3s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #6d5dfc 0%, #8b7cff 100%);
      color: #fff;
      padding: 10px 24px;
      font-size: 14px;
      box-shadow: 0 4px 16px rgba(109, 93, 252, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 28px rgba(109, 93, 252, 0.5);
      color: #fff;
    }

    .btn-primary:active {
      transform: translateY(0);
      box-shadow: 0 2px 8px rgba(109, 93, 252, 0.4);
    }

    .btn-sm {
      padding: 8px 18px;
      font-size: 13px;
    }

    .btn-lg {
      padding: 14px 34px;
      font-size: 16px;
    }

    .btn-ghost {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      color: var(--color-text);
      background: rgba(148, 163, 184, 0.08);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      transition: all 0.3s ease;
    }

    .btn-ghost:hover {
      background: rgba(148, 163, 184, 0.16);
      transform: translateY(-2px);
    }

    .nav-toggle {
      display: none;
      flex-direction: column;
      justify-content: center;
      gap: 5px;
      width: 42px;
      height: 42px;
      padding: 8px;
      border-radius: 10px;
      background: rgba(148, 163, 184, 0.08);
    }

    .nav-toggle span {
      display: block;
      height: 2px;
      width: 22px;
      margin: 0 auto;
      background: var(--color-text);
      border-radius: 2px;
      transition: all 0.3s ease;
    }

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

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

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

    .nav-toggle:hover {
      background: rgba(109, 93, 252, 0.15);
    }

    /* ===== Hero Cat ===== */
    .hero-cat {
      position: relative;
      min-height: 360px;
      padding: 100px 0 80px;
      background: linear-gradient(135deg, rgba(10, 14, 26, 0.9) 0%, rgba(17, 24, 39, 0.75) 55%, rgba(109, 93, 252, 0.45) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
      display: flex;
      align-items: center;
    }

    .hero-cat::after {
      content: '';
      position: absolute;
      inset: auto 0 0 0;
      height: 80px;
      background: linear-gradient(to bottom, transparent, var(--color-bg));
      pointer-events: none;
    }

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

    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--color-text-muted);
      margin-bottom: 20px;
    }

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

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

    .breadcrumb i {
      font-size: 12px;
      color: rgba(148, 163, 184, 0.5);
    }

    .hero-cat h1 {
      font-size: clamp(34px, 5vw, 52px);
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: 1px;
      margin-bottom: 16px;
      text-shadow: 0 4px 28px rgba(0, 0, 0, 0.5);
    }

    .hero-cat h1 .gradient-text {
      background: linear-gradient(135deg, #8b7cff, #00d4aa);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-cat p {
      font-size: 17px;
      line-height: 1.8;
      color: rgba(232, 236, 244, 0.85);
      max-width: 620px;
      margin-bottom: 32px;
    }

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

    .hero-cat-actions .btn-ghost {
      color: #fff;
      border-color: rgba(255, 255, 255, 0.3);
      background: rgba(255, 255, 255, 0.06);
    }

    .hero-cat-actions .btn-ghost:hover {
      background: rgba(255, 255, 255, 0.14);
    }

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

    .section-alt {
      background-color: var(--color-bg-alt);
    }

    .section-head {
      text-align: center;
      max-width: 640px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 600;
      color: var(--color-accent);
      background: rgba(0, 212, 170, 0.1);
      border: 1px solid rgba(0, 212, 170, 0.25);
      border-radius: var(--radius-full);
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: clamp(28px, 3.5vw, 38px);
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--color-text-muted);
      line-height: 1.7;
    }

    /* ===== Overview ===== */
    .overview-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 10px;
    }

    .overview-card {
      position: relative;
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      transition: all 0.35s ease;
      overflow: hidden;
    }

    .overview-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
      border-radius: 0 0 6px 6px;
      opacity: 0.7;
      transition: width 0.35s ease;
    }

    .overview-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card);
      border-color: rgba(109, 93, 252, 0.3);
    }

    .overview-card:hover::before {
      width: 90px;
    }

    .overview-icon {
      width: 52px;
      height: 52px;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 16px;
      font-size: 21px;
      background: linear-gradient(135deg, rgba(109, 93, 252, 0.2), rgba(0, 212, 170, 0.15));
      color: var(--color-primary-light);
      border: 1px solid rgba(109, 93, 252, 0.2);
    }

    .overview-number {
      font-size: 38px;
      font-weight: 800;
      color: var(--color-text);
      line-height: 1.2;
      letter-spacing: -1px;
      margin-bottom: 4px;
    }

    .overview-number span {
      font-size: 20px;
      color: var(--color-accent);
      margin-left: 2px;
    }

    .overview-card h3 {
      font-size: 15px;
      font-weight: 600;
      color: var(--color-text-muted);
    }

    /* ===== Guide Grid ===== */
    .guide-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .guide-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: all 0.35s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .guide-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card);
      border-color: rgba(109, 93, 252, 0.35);
    }

    .guide-cover {
      position: relative;
      height: 190px;
      overflow: hidden;
    }

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

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

    .guide-cover::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, var(--color-surface) 0%, transparent 60%);
    }

    .guide-cover-badge {
      position: absolute;
      top: 14px;
      left: 14px;
      z-index: 2;
      padding: 5px 14px;
      font-size: 12px;
      font-weight: 700;
      color: #fff;
      background: linear-gradient(135deg, rgba(109, 93, 252, 0.9), rgba(109, 93, 252, 0.65));
      border-radius: var(--radius-full);
      backdrop-filter: blur(6px);
      letter-spacing: 0.5px;
    }

    .guide-cover .cover-index {
      position: absolute;
      right: 16px;
      bottom: 8px;
      z-index: 2;
      font-size: 44px;
      font-weight: 800;
      color: rgba(255, 255, 255, 0.12);
      letter-spacing: -2px;
    }

    .guide-body {
      padding: 26px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .guide-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 12px;
    }

    .guide-tag {
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 600;
      color: var(--color-accent);
      background: rgba(0, 212, 170, 0.08);
      border: 1px solid rgba(0, 212, 170, 0.2);
      border-radius: var(--radius-full);
    }

    .guide-body h3 {
      font-size: 19px;
      font-weight: 700;
      line-height: 1.45;
      margin-bottom: 10px;
      color: var(--color-text);
    }

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

    .guide-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 14px;
      font-weight: 600;
      color: var(--color-primary-light);
      transition: gap 0.25s ease, color 0.25s ease;
    }

    .guide-link:hover {
      color: var(--color-accent);
      gap: 10px;
    }

    /* ===== Path ===== */
    .path-section {
      background:
        linear-gradient(180deg, var(--color-bg-alt) 0%, rgba(17, 24, 39, 0.85) 100%),
        url('/assets/images/backpic/back-2.png') center/cover no-repeat;
      position: relative;
    }

    .path-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      position: relative;
      z-index: 2;
    }

    .path-step {
      position: relative;
      background: rgba(26, 33, 48, 0.82);
      backdrop-filter: blur(10px);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 36px 28px 32px;
      transition: all 0.35s ease;
      overflow: hidden;
    }

    .path-step:hover {
      transform: translateY(-6px);
      border-color: rgba(109, 93, 252, 0.35);
      box-shadow: var(--shadow-card);
      background: rgba(26, 33, 48, 0.95);
    }

    .path-step .step-number {
      position: absolute;
      top: 18px;
      right: 20px;
      font-size: 60px;
      font-weight: 800;
      line-height: 1;
      color: rgba(109, 93, 252, 0.15);
      letter-spacing: -3px;
    }

    .path-step .step-icon {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 14px;
      font-size: 19px;
      margin-bottom: 18px;
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      color: #fff;
      box-shadow: 0 0 20px rgba(109, 93, 252, 0.3);
    }

    .path-step h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .path-step h3 span {
      color: var(--color-accent);
      font-size: 15px;
      font-weight: 600;
      margin-left: 8px;
    }

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

    .path-step ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .path-step ul li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: rgba(232, 236, 244, 0.75);
    }

    .path-step ul li i {
      color: var(--color-accent);
      font-size: 12px;
    }

    .path-line {
      position: absolute;
      top: 60px;
      left: 12%;
      right: 12%;
      height: 2px;
      background: linear-gradient(90deg, transparent, rgba(109, 93, 252, 0.4), rgba(0, 212, 170, 0.4), transparent);
      z-index: 1;
      border-radius: 2px;
    }

    /* ===== Article List ===== */
    .article-list-wrap {
      max-width: 920px;
      margin: 0 auto;
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    .article-item {
      display: flex;
      align-items: flex-start;
      gap: 20px;
      padding: 28px 32px;
      border-bottom: 1px solid var(--color-border);
      transition: background 0.25s ease;
    }

    .article-item:last-child {
      border-bottom: none;
    }

    .article-item:hover {
      background: var(--color-surface-hover);
    }

    .article-tag-block {
      flex-shrink: 0;
      width: 92px;
      padding-top: 6px;
    }

    .article-tag-label {
      display: inline-block;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 700;
      color: var(--color-primary-light);
      background: rgba(109, 93, 252, 0.12);
      border: 1px solid rgba(109, 93, 252, 0.2);
      border-radius: var(--radius-full);
      white-space: nowrap;
    }

    .article-main {
      flex: 1;
      min-width: 0;
    }

    .article-main h3 {
      font-size: 17px;
      font-weight: 700;
      line-height: 1.5;
      margin-bottom: 6px;
      color: var(--color-text);
      transition: color 0.2s ease;
    }

    .article-item:hover .article-main h3 {
      color: var(--color-primary-light);
    }

    .article-main p {
      font-size: 14px;
      color: var(--color-text-muted);
      line-height: 1.6;
      margin-bottom: 10px;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .article-meta {
      display: flex;
      align-items: center;
      gap: 16px;
      font-size: 13px;
      color: rgba(148, 163, 184, 0.8);
    }

    .article-meta i {
      font-size: 12px;
      margin-right: 4px;
      color: var(--color-primary-light);
    }

    .article-arrow {
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      margin-top: 14px;
      border-radius: 50%;
      background: rgba(148, 163, 184, 0.08);
      color: var(--color-text-muted);
      transition: all 0.3s ease;
    }

    .article-item:hover .article-arrow {
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      color: #fff;
      transform: translateX(3px);
    }

    /* ===== FAQ ===== */
    .faq-wrap {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: 16px;
      overflow: hidden;
      transition: border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .faq-item.is-open {
      border-color: rgba(109, 93, 252, 0.4);
      box-shadow: 0 0 24px rgba(109, 93, 252, 0.15);
    }

    .faq-toggle {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 22px 26px;
      text-align: left;
      color: var(--color-text);
      font-size: 16px;
      font-weight: 600;
      transition: background 0.25s ease;
    }

    .faq-toggle:hover {
      background: rgba(148, 163, 184, 0.05);
    }

    .faq-toggle .faq-icon {
      width: 30px;
      height: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      border-radius: 50%;
      background: rgba(109, 93, 252, 0.14);
      color: var(--color-primary-light);
      font-size: 13px;
      transition: all 0.3s ease;
    }

    .faq-item.is-open .faq-icon {
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      color: #fff;
      transform: rotate(45deg);
    }

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

    .faq-content-inner {
      padding: 0 26px 22px;
      font-size: 14px;
      line-height: 1.75;
      color: var(--color-text-muted);
      border-top: 1px solid transparent;
    }

    .faq-item.is-open .faq-content-inner {
      border-top-color: var(--color-border);
      padding-top: 16px;
    }

    /* ===== CTA ===== */
    .cta-section {
      padding: 60px 0 90px;
    }

    .cta-card {
      position: relative;
      border-radius: 28px;
      overflow: hidden;
      padding: 70px 48px;
      text-align: center;
      background: linear-gradient(135deg, rgba(109, 93, 252, 0.9) 0%, rgba(74, 63, 212, 0.92) 40%, rgba(0, 212, 170, 0.75) 100%), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .cta-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.15), transparent 50%);
    }

    .cta-card h2 {
      position: relative;
      z-index: 2;
      font-size: clamp(26px, 3vw, 36px);
      font-weight: 800;
      color: #fff;
      margin-bottom: 12px;
      text-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
    }

    .cta-card p {
      position: relative;
      z-index: 2;
      font-size: 16px;
      color: rgba(255, 255, 255, 0.9);
      max-width: 520px;
      margin-bottom: 28px;
      line-height: 1.7;
    }

    .cta-btn-group {
      position: relative;
      z-index: 2;
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .btn-white {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 32px;
      font-size: 15px;
      font-weight: 700;
      color: #6d5dfc;
      background: #fff;
      border-radius: var(--radius-full);
      box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
      transition: all 0.3s ease;
    }

    .btn-white:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
      color: #4a3fd4;
    }

    .btn-outline-white {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 32px;
      font-size: 15px;
      font-weight: 700;
      color: #fff;
      border: 2px solid rgba(255, 255, 255, 0.7);
      border-radius: var(--radius-full);
      transition: all 0.3s ease;
      background: rgba(255, 255, 255, 0.08);
    }

    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.2);
      transform: translateY(-3px);
      border-color: #fff;
    }

    /* ===== Footer ===== */
    .site-footer {
      background: #0d1220;
      border-top: 1px solid var(--color-border);
      padding-top: 60px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
      gap: 40px;
      padding-bottom: 40px;
    }

    .footer-brand .logo {
      margin-bottom: 14px;
    }

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

    .footer-links h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--color-text);
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }

    .footer-links a {
      display: block;
      font-size: 14px;
      color: var(--color-text-muted);
      padding: 5px 0;
      transition: color 0.25s ease, padding-left 0.25s ease;
    }

    .footer-links a:hover {
      color: var(--color-accent);
      padding-left: 6px;
    }

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

    .footer-bottom {
      border-top: 1px solid var(--color-border);
      padding: 20px 0;
      text-align: center;
      font-size: 13px;
      color: rgba(148, 163, 184, 0.6);
    }

    /* ===== Focus ===== */
    a:focus-visible,
    button:focus-visible {
      outline: 2px solid var(--color-accent);
      outline-offset: 3px;
      border-radius: 6px;
    }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
      .guide-grid {
        grid-template-columns: repeat(2, 1fr);
      }

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

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

      .path-grid {
        gap: 20px;
      }

      .path-line {
        display: none;
      }
    }

    @media (max-width: 768px) {
      :root {
        --space-section: 56px;
      }

      .site-header {
        background: rgba(10, 14, 26, 0.97);
      }

      .main-nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px 24px;
        gap: 6px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-16px);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 99;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      }

      .main-nav.is-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
      }

      .nav-link {
        padding: 12px 18px;
        border-radius: 12px;
        font-size: 16px;
      }

      .nav-toggle {
        display: flex;
      }

      .header-inner {
        height: 64px;
      }

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

      .hero-cat {
        min-height: 320px;
        padding: 80px 0 60px;
      }

      .hero-cat p {
        font-size: 15px;
      }

      .hero-cat-actions .btn-ghost {
        display: none;
      }

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

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

      .article-item {
        flex-direction: column;
        gap: 10px;
        padding: 22px;
      }

      .article-tag-block {
        width: auto;
        padding-top: 0;
      }

      .article-arrow {
        display: none;
      }

      .cta-card {
        padding: 44px 24px;
        border-radius: 20px;
      }

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

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

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

      .overview-card {
        padding: 24px 20px;
        display: flex;
        align-items: center;
        gap: 16px;
        text-align: left;
      }

      .overview-icon {
        margin: 0;
        flex-shrink: 0;
      }

      .overview-number {
        font-size: 30px;
      }

      .section-head {
        margin-bottom: 34px;
      }

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

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

      .cta-btn-group .btn-white,
      .cta-btn-group .btn-outline-white {
        width: 100%;
      }

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

      .faq-content-inner {
        padding: 0 18px 18px;
      }

      .article-main h3 {
        font-size: 16px;
      }

      .article-meta {
        flex-wrap: wrap;
        gap: 8px 14px;
      }
    }

/* roulang page: article */
:root {
  --bg: #0a0e17;
  --bg-soft: #0f172a;
  --card: #111827;
  --card-hover: #1a2332;
  --border: #1e293b;
  --primary: #22d3ee;
  --primary-dark: #0891b2;
  --secondary: #a855f7;
  --text: #e2e8f0;
  --text-weak: #94a3b8;
  --text-mute: #64748b;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 50px rgba(34, 211, 238, 0.12);
  --font: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
  --space-section: 72px;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}
input, select, textarea {
  font: inherit;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 3px solid rgba(34, 211, 238, 0.5);
  outline-offset: 2px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #06121a;
  border: none;
  box-shadow: 0 4px 24px rgba(34, 211, 238, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(34, 211, 238, 0.38);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 4px 20px rgba(34, 211, 238, 0.25);
}
.btn-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(34, 211, 238, 0.06);
}
.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}
.btn-block {
  display: flex;
  width: 100%;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(30, 41, 59, 0.7);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.02), 0 10px 40px rgba(0, 0, 0, 0.15);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  flex-shrink: 0;
}
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #06121a;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.5px;
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.3);
}
.logo-text {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0.5px;
}
.main-nav {
  display: flex;
  gap: 6px;
  align-items: center;
}
.nav-link {
  position: relative;
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-weak);
  transition: all 0.3s ease;
}
.nav-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}
.nav-link.active {
  color: #06121a;
  background: linear-gradient(135deg, var(--primary), #4ade80);
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.35);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  border-radius: 10px;
  transition: background 0.25s ease;
}
.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.35s ease;
}
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.article-hero {
  position: relative;
  padding: 72px 0 64px;
  background: linear-gradient(180deg, rgba(10, 14, 23, 0.72), rgba(10, 14, 23, 0.96)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid rgba(30, 41, 59, 0.6);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-weak);
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--primary);
  transition: color 0.25s ease;
}
.breadcrumb a:hover {
  color: #ffe1a8;
}
.breadcrumb-sep {
  color: var(--text-mute);
}
.article-hero h1 {
  font-size: 42px;
  line-height: 1.25;
  font-weight: 800;
  max-width: 850px;
  letter-spacing: -0.5px;
  background: linear-gradient(180deg, #f8fafc 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  color: var(--text-weak);
  font-size: 14px;
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.badge-primary {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.18), rgba(168, 85, 247, 0.18));
  color: var(--primary);
  border: 1px solid rgba(34, 211, 238, 0.3);
}
.badge-soft {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-weak);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.article-body {
  padding: 64px 0;
  background: var(--bg);
}
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 48px;
  align-items: start;
}
.article-main {
  min-width: 0;
}
.article-content {
  font-size: 16px;
  line-height: 1.9;
  color: #cbd5e1;
  word-wrap: break-word;
}
.article-content > * {
  margin-bottom: 20px;
}
.article-content > *:last-child {
  margin-bottom: 0;
}
.article-content h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(30, 41, 59, 0.9);
  letter-spacing: -0.3px;
}
.article-content h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text);
  margin-top: 36px;
  margin-bottom: 14px;
}
.article-content h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-top: 28px;
  margin-bottom: 12px;
}
.article-content p {
  margin-bottom: 20px;
  color: #cbd5e1;
}
.article-content a {
  color: var(--primary);
  border-bottom: 1px solid rgba(34, 211, 238, 0.3);
  padding-bottom: 1px;
}
.article-content a:hover {
  color: #4ade80;
  border-bottom-color: #4ade80;
}
.article-content ul,
.article-content ol {
  margin: 0 0 24px 1.5em;
  color: #cbd5e1;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content li::marker {
  color: var(--primary);
}
.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: rgba(34, 211, 238, 0.05);
  padding: 18px 22px;
  margin: 28px 0;
  border-radius: 0 14px 14px 0;
  color: #cbd5e1;
  font-style: normal;
}
.article-content img {
  border-radius: var(--radius);
  margin: 28px 0;
  box-shadow: var(--shadow);
  max-width: 100%;
  height: auto;
}
.article-content code {
  background: rgba(255, 255, 255, 0.08);
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.88em;
  color: var(--primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.article-content pre {
  background: #0d1524;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
  line-height: 1.6;
}
.article-content pre code {
  background: none;
  color: #e2e8f0;
  padding: 0;
}
.article-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 36px 0;
}
.article-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 90px;
}
.side-card {
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid rgba(30, 41, 59, 0.8);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.side-card:hover {
  border-color: rgba(34, 211, 238, 0.3);
  box-shadow: var(--shadow-glow);
}
.side-card img {
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.side-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.side-card p {
  font-size: 14px;
  color: var(--text-weak);
  margin-bottom: 16px;
  line-height: 1.7;
}
.info-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.info-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(30, 41, 59, 0.6);
  font-size: 14px;
}
.info-list li:last-child {
  border-bottom: none;
}
.info-list li span {
  color: var(--text-weak);
}
.info-list li strong {
  color: var(--text);
  font-weight: 600;
}
.article-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}
.article-tags-section {
  padding: 40px 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.article-tags::before {
  content: "标签：";
  font-size: 14px;
  color: var(--text-mute);
  font-weight: 500;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-weak);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: all 0.3s ease;
}
.tag:hover {
  color: var(--primary);
  border-color: rgba(34, 211, 238, 0.4);
  background: rgba(34, 211, 238, 0.08);
}
.related-section {
  padding: 64px 0;
  background: var(--bg);
}
.section-head {
  text-align: center;
  margin-bottom: 40px;
}
.section-head h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}
.section-head p {
  font-size: 15px;
  color: var(--text-weak);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: block;
}
.related-card:hover {
  transform: translateY(-6px);
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: var(--shadow-glow);
}
.related-card:hover img {
  transform: scale(1.05);
}
.related-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.related-card-body {
  padding: 24px;
}
.related-card-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 12px 0 8px;
}
.related-card-body p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
}
.cta-section {
  padding: 64px 0;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}
.cta-box {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.08), rgba(168, 85, 247, 0.08));
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: 28px;
  padding: 52px 40px;
  text-align: center;
  box-shadow: inset 0 0 80px rgba(34, 211, 238, 0.03);
}
.cta-box h2 {
  font-size: 30px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
}
.cta-box p {
  font-size: 16px;
  color: var(--text-weak);
  max-width: 560px;
  margin: 0 auto 28px;
}
.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.faq-section {
  padding: 64px 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}
.faq-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.3s ease;
}
.faq-item:hover {
  border-color: rgba(34, 211, 238, 0.35);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.faq-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.faq-item p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
}
.not-found-section {
  padding: 120px 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
}
.not-found-box {
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 56px 40px;
  box-shadow: var(--shadow);
}
.not-found-code {
  font-size: 64px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  display: block;
  margin-bottom: 16px;
}
.not-found-box h1 {
  font-size: 26px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
}
.not-found-box p {
  font-size: 15px;
  color: var(--text-weak);
  margin-bottom: 28px;
}
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding-top: 56px;
}
.footer-grid {
  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-weak);
  line-height: 1.8;
  margin-top: 12px;
}
.footer-links h4,
.footer-info h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.footer-links a {
  display: block;
  font-size: 14px;
  color: var(--text-weak);
  padding: 5px 0;
  transition: color 0.25s ease;
}
.footer-links a:hover {
  color: var(--primary);
}
.footer-info p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.8;
}
.footer-bottom {
  border-top: 1px solid rgba(30, 41, 59, 0.7);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-mute);
}
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .article-side {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}
@media (max-width: 768px) {
  :root {
    --space-section: 48px;
  }
  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(10, 14, 23, 0.98);
    padding: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 99;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  }
  .main-nav.open {
    transform: translateY(0);
  }
  .nav-link {
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 16px;
  }
  .header-actions .btn-sm {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .article-hero {
    padding: 48px 0 40px;
  }
  .article-hero h1 {
    font-size: 30px;
  }
  .article-content h2 {
    font-size: 24px;
  }
  .article-content h3 {
    font-size: 20px;
  }
  .article-side {
    grid-template-columns: 1fr;
  }
  .cta-box {
    padding: 36px 24px;
  }
  .cta-box h2 {
    font-size: 24px;
  }
}
@media (max-width: 520px) {
  .container {
    padding: 0 18px;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .article-meta {
    gap: 10px;
    font-size: 13px;
  }
  .article-hero h1 {
    font-size: 26px;
  }
  .article-content {
    font-size: 15px;
  }
  .not-found-box {
    padding: 40px 24px;
  }
  .breadcrumb {
    font-size: 13px;
  }
}

/* roulang page: category2 */
:root {
    --bg-deep: #070b14;
    --bg-body: #0b101c;
    --bg-card: rgba(17, 24, 39, 0.7);
    --border-light: rgba(255, 255, 255, 0.08);
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --accent: #22d3ee;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 24px rgba(99, 102, 241, 0.35);
    --font-main: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  }

  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    font-family: var(--font-main);
    background: var(--bg-body);
    color: var(--text-main);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  img { max-width: 100%; display: block; }
  a { color: inherit; text-decoration: none; }
  button { font-family: inherit; }

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

  /* ===== Header ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(7, 11, 20, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
  }
  .logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
  }
  .logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    font-weight: 800;
    font-size: 15px;
    color: #fff;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.45);
    font-style: normal;
  }
  .logo-text {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.5px;
  }
  .main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
  }
  .nav-link {
    position: relative;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
    padding: 6px 2px;
    transition: color 0.25s;
    background: transparent;
    border: none;
  }
  .nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.3s ease;
  }
  .nav-link:hover {
    color: #ffffff;
  }
  .nav-link.active {
    color: #ffffff;
    text-shadow: 0 0 16px rgba(99, 102, 241, 0.7);
  }
  .nav-link.active::after {
    transform: scaleX(1);
  }
  .header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.25s ease;
    border: none;
    cursor: pointer;
    font-size: 15px;
  }
  .btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.35);
    padding: 12px 24px;
  }
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
  }
  .btn-sm {
    padding: 8px 18px;
    font-size: 14px;
    border-radius: 8px;
  }
  .btn-outline {
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: #e2e8f0;
    background: transparent;
    padding: 12px 28px;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.25s ease;
  }
  .btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(34, 211, 238, 0.08);
  }
  .nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    padding: 8px;
    cursor: pointer;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
  }
  .nav-toggle span {
    width: 20px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all 0.3s ease;
  }
  .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* ===== Section ===== */
  .section {
    padding: 96px 0;
  }
  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 16px;
    border-radius: 999px;
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary-hover);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    border: 1px solid rgba(99, 102, 241, 0.25);
    margin-bottom: 16px;
  }
  .section-title {
    font-size: 38px;
    font-weight: 800;
    line-height: 1.25;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
  }
  .section-desc {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 660px;
    line-height: 1.8;
  }
  .divider-line {
    width: 60px;
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    margin-top: 8px;
    margin-bottom: 24px;
  }

  /* ===== Banner ===== */
  .page-banner {
    position: relative;
    padding: 120px 0 96px;
    background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(7, 11, 20, 0.88) 0%, rgba(7, 11, 20, 0.75) 50%, rgba(11, 16, 28, 0.96) 100%);
  }
  .page-banner .container {
    position: relative;
    z-index: 2;
  }
  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
  }
  .breadcrumb a:hover {
    color: var(--accent);
  }
  .breadcrumb i {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.3);
  }

  /* ===== Card ===== */
  .card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    height: 100%;
  }
  .card:hover {
    transform: translateY(-6px);
    border-color: rgba(99, 102, 241, 0.45);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), 0 0 20px rgba(99, 102, 241, 0.15);
  }
  .card-img {
    height: 200px;
    width: 100%;
    object-fit: cover;
  }
  .card-body {
    padding: 24px;
  }
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    background: rgba(34, 211, 238, 0.1);
    color: var(--accent);
    border: 1px solid rgba(34, 211, 238, 0.2);
  }
  .badge-purple {
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary-hover);
    border-color: rgba(99, 102, 241, 0.25);
  }

  /* ===== Category index ===== */
  .cat-card {
    background: rgba(17, 24, 39, 0.6);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    text-align: center;
    transition: all 0.3s ease;
  }
  .cat-card:hover {
    border-color: rgba(34, 211, 238, 0.35);
    background: rgba(17, 24, 39, 0.9);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  }
  .cat-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(34, 211, 238, 0.15));
    color: var(--primary-hover);
    font-size: 20px;
    margin-bottom: 14px;
  }

  /* ===== Resource list ===== */
  .resource-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: background 0.2s ease;
  }
  .resource-item:last-child { border-bottom: none; }
  .resource-index {
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
    background: rgba(34, 211, 238, 0.08);
    border-radius: 8px;
    min-width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .resource-item:hover .resource-title {
    color: var(--primary-hover);
  }

  /* ===== Stats ===== */
  .stats-section {
    background: linear-gradient(160deg, rgba(99, 102, 241, 0.08), rgba(34, 211, 238, 0.04));
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }
  .stat-card {
    background: rgba(11, 16, 28, 0.7);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-lg);
    padding: 36px 24px;
    text-align: center;
    transition: border-color 0.3s ease;
  }
  .stat-card:hover {
    border-color: rgba(34, 211, 238, 0.4);
  }
  .stat-num {
    font-size: 44px;
    font-weight: 800;
    line-height: 1.2;
    background: linear-gradient(135deg, #818cf8, #22d3ee);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  /* ===== FAQ ===== */
  .faq-item {
    background: rgba(17, 24, 39, 0.7);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 12px;
    transition: border-color 0.3s ease;
  }
  .faq-item.open {
    border-color: rgba(99, 102, 241, 0.4);
  }
  .faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 22px 28px;
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    color: #e2e8f0;
  }
  .faq-icon {
    transition: transform 0.3s ease;
    color: var(--accent);
    font-size: 16px;
  }
  .faq-item.open .faq-icon {
    transform: rotate(45deg);
  }
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    padding: 0 28px;
    color: var(--text-muted);
    line-height: 1.8;
    font-size: 15px;
  }
  .faq-item.open .faq-answer {
    max-height: 240px;
    padding-bottom: 24px;
  }

  /* ===== CTA ===== */
  .cta-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(34, 211, 238, 0.08));
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 24px;
    padding: 64px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
  }
  .cta-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(99, 102, 241, 0.12) 0%, transparent 60%);
    pointer-events: none;
  }
  .cta-box h2 {
    font-size: 32px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
  }
  .cta-box p {
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto 32px;
    font-size: 16px;
    line-height: 1.8;
    position: relative;
    z-index: 1;
  }

  /* ===== Footer ===== */
  .site-footer {
    background: var(--bg-deep);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 64px;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 48px;
  }
  .footer-brand p {
    color: var(--text-muted);
    margin-top: 16px;
    font-size: 14px;
    line-height: 1.8;
    max-width: 280px;
  }
  .footer-links h4,
  .footer-info h4 {
    color: #fff;
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 16px;
  }
  .footer-links a {
    display: block;
    color: var(--text-muted);
    font-size: 14px;
    padding: 4px 0;
    transition: color 0.25s, transform 0.25s;
  }
  .footer-links a:hover {
    color: var(--accent);
    transform: translateX(4px);
  }
  .footer-info p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.8;
  }
  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 24px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
  }

  /* ===== Responsive ===== */
  @media (max-width: 1024px) {
    .section { padding: 80px 0; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  }
  @media (max-width: 820px) {
    .main-nav {
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(7, 11, 20, 0.98);
      flex-direction: column;
      justify-content: flex-start;
      align-items: flex-start;
      padding: 48px 32px;
      gap: 28px;
      transform: translateX(100%);
      transition: transform 0.35s ease;
      z-index: 100;
    }
    .main-nav.open {
      transform: translateX(0);
    }
    .nav-toggle {
      display: inline-flex;
    }
    .section-title {
      font-size: 30px;
    }
    .page-banner {
      padding: 96px 0 72px;
    }
  }
  @media (max-width: 640px) {
    .container { padding: 0 20px; }
    .section { padding: 64px 0; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .cta-box { padding: 40px 24px; }
    .stat-num { font-size: 36px; }
    .header-actions .btn-sm { display: none; }
  }