/* roulang page: index */
:root {
  --primary: #0e2a47;
  --primary-light: #16447a;
  --primary-soft: #eaf1f8;
  --accent: #ff7a00;
  --accent-light: #ffa64d;
  --bg: #f6f8fb;
  --bg-deep: #0b1b2b;
  --surface: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 14px 40px rgba(14, 42, 71, 0.08);
  --shadow-sm: 0 6px 18px rgba(14, 42, 71, 0.06);
  --transition: all .3s ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  margin: 0;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
a:hover { color: var(--accent); }
ul, ol { margin: 0; padding: 0; list-style: none; }
button, input, select, textarea { font-family: inherit; }
.container { max-width: 1200px; padding-left: 20px; padding-right: 20px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  padding: 14px 0;
}
.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  color: var(--primary);
  line-height: 1.2;
}
.brand .brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.site-nav .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  background: transparent;
  border: 1px solid transparent;
  transition: var(--transition);
}
.site-nav .nav-link:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: transparent;
}
.site-nav .nav-link.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 18px rgba(14, 42, 71, 0.22);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 100px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  font-weight: 700;
  font-size: 0.92rem;
  border: none;
  transition: var(--transition);
  box-shadow: 0 6px 18px rgba(255, 122, 0, 0.3);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(255, 122, 0, 0.36); color: #fff; }
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--primary);
  font-size: 1.2rem;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  padding: 120px 0 110px;
  background: linear-gradient(135deg, rgba(11, 27, 43, 0.94), rgba(14, 42, 71, 0.82)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  color: #fff;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.2), transparent 70%);
  right: -80px;
  top: -80px;
  pointer-events: none;
}
.hero .container { position: relative; z-index: 2; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #ffd9b3;
  margin-bottom: 24px;
  backdrop-filter: blur(6px);
}
.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.01em;
  margin-bottom: 20px;
  max-width: 680px;
}
.hero h1 span { color: var(--accent-light); }
.hero p.lead {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.82);
  max-width: 560px;
  margin-bottom: 36px;
}
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 1rem;
  transition: var(--transition);
  border: none;
}
.btn-hero-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  box-shadow: 0 10px 28px rgba(255, 122, 0, 0.35);
}
.btn-hero-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(255, 122, 0, 0.42); color: #fff; }
.btn-hero-ghost {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  backdrop-filter: blur(6px);
}
.btn-hero-ghost:hover { background: rgba(255, 255, 255, 0.2); transform: translateY(-3px); color: #fff; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  flex-wrap: wrap;
}
.hero-stats .stat-item strong {
  font-size: 1.9rem;
  font-weight: 800;
  display: block;
  color: #fff;
}
.hero-stats .stat-item span {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
}

/* Section */
.section { padding: 90px 0; }
.section-alt { background: var(--surface); }
.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}
.section-tag {
  display: inline-block;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 100px;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.section-head h2 {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 14px;
  line-height: 1.3;
}
.section-head p {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Features */
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  height: 100%;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  opacity: 0;
  transition: var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(255, 122, 0, 0.2); }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 22px;
  transition: var(--transition);
}
.feature-card:hover .feature-icon {
  background: var(--primary);
  color: #fff;
  transform: scale(1.05);
}
.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--primary);
}
.feature-card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 0; }

/* Category Entry */
.category-entry {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: 28px;
  overflow: hidden;
  position: relative;
  color: #fff;
  padding: 0;
}
.category-entry .row { align-items: center; }
.category-entry .category-media {
  position: relative;
  min-height: 380px;
  overflow: hidden;
}
.category-entry .category-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.category-entry:hover .category-media img { transform: scale(1.04); }
.category-entry .category-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(14, 42, 71, 0.35), transparent 60%);
}
.category-entry .category-content {
  padding: 56px 48px;
  position: relative;
}
.category-content .cat-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
  color: #ffd9b3;
}
.category-content h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}
.category-content p {
  color: rgba(255, 255, 255, 0.84);
  font-size: 1.02rem;
  margin-bottom: 28px;
  max-width: 420px;
}
.btn-category {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #fff;
  color: var(--primary);
  font-weight: 700;
  padding: 14px 30px;
  border-radius: 100px;
  border: none;
  font-size: 0.98rem;
  transition: var(--transition);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.15);
}
.btn-category:hover { transform: translateY(-3px); box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22); color: var(--primary); }
.category-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.category-tags .tag {
  background: rgba(255, 255, 255, 0.1);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

/* Posts */
.posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.post-card {
  display: flex;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  transition: var(--transition);
  align-items: flex-start;
}
.post-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
  border-color: rgba(255, 122, 0, 0.25);
}
.post-card .post-index {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.3rem;
  flex-shrink: 0;
  transition: var(--transition);
}
.post-card:hover .post-index {
  background: var(--accent);
  color: #fff;
}
.post-card .post-body { flex: 1; min-width: 0; }
.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.post-meta .badge-cat {
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
}
.post-meta time {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.post-card h3 {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
  line-height: 1.4;
}
.post-card h3 a:hover { color: var(--accent); }
.post-card p {
  color: var(--text-muted);
  font-size: 0.93rem;
  margin-bottom: 12px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
}
.post-link:hover { color: var(--accent); gap: 10px; }
.empty-box {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Stats */
.stats-section {
  background: linear-gradient(135deg, var(--bg-deep), var(--primary));
  color: #fff;
  padding: 90px 0;
  position: relative;
  overflow: hidden;
}
.stats-section::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.15), transparent 70%);
  left: -120px;
  bottom: -160px;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; position: relative; z-index: 2; }
.stat-block { text-align: center; padding: 20px; }
.stat-block .stat-num {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent-light);
  line-height: 1.2;
  margin-bottom: 6px;
  font-family: "Georgia", serif;
  letter-spacing: -0.02em;
}
.stat-block .stat-label {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.04em;
}

/* Process */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 26px;
  counter-reset: process;
}
.process-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 26px;
  text-align: center;
  position: relative;
  transition: var(--transition);
}
.process-item:hover { box-shadow: var(--shadow); transform: translateY(-5px); }
.process-item .step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  border: 4px solid var(--primary-soft);
}
.process-item:nth-child(2) .step-num { background: var(--accent); border-color: rgba(255, 122, 0, 0.15); }
.process-item h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--primary);
}
.process-item p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }

/* FAQ */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(255, 122, 0, 0.25); box-shadow: var(--shadow-sm); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 28px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--primary);
  cursor: pointer;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: var(--transition);
}
.faq-question i {
  color: var(--accent);
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.faq-item.open .faq-question i { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.open .faq-answer { max-height: 300px; }
.faq-answer p {
  padding: 0 28px 24px;
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.7;
  margin: 0;
}

/* CTA */
.cta-section {
  background: linear-gradient(135deg, var(--bg-deep), var(--primary));
  border-radius: 28px;
  padding: 72px 56px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: "";
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.25), transparent 70%);
  right: -60px;
  top: -60px;
}
.cta-section::after {
  content: "";
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.06), transparent 70%);
  left: 20px;
  bottom: -60px;
}
.cta-section h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}
.cta-section p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.08rem;
  max-width: 540px;
  margin: 0 auto 32px;
  position: relative;
  z-index: 2;
}
.cta-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
}
.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-weight: 700;
  border: none;
  transition: var(--transition);
}
.btn-cta-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 24px rgba(255, 122, 0, 0.35); }
.btn-cta-primary:hover { background: var(--accent-light); transform: translateY(-3px); color: #fff; }
.btn-cta-outline { background: transparent; border: 1px solid rgba(255, 255, 255, 0.35); color: #fff; }
.btn-cta-outline:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-3px); color: #fff; }

/* Footer */
.site-footer {
  background: var(--bg-deep);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 24px;
  margin-top: 90px;
}
.site-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.site-footer .footer-brand .brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.footer-desc { font-size: 0.92rem; color: rgba(255, 255, 255, 0.55); max-width: 320px; }
.footer-title {
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 18px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.92rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.footer-links a:hover { color: var(--accent-light); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  margin-top: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { margin: 0; font-size: 0.85rem; color: rgba(255, 255, 255, 0.4); }

/* Mobile */
@media (max-width: 991.98px) {
  .hero { padding: 80px 0; }
  .hero h1 { font-size: 2.5rem; }
  .process-grid, .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .category-entry .category-media { min-height: 260px; }
  .category-entry .category-content { padding: 40px 30px; }
  .cta-section { padding: 48px 28px; }
}

@media (max-width: 767.98px) {
  .site-header { padding: 10px 0; }
  .site-header .desktop-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .mobile-nav {
    display: none;
    width: 100%;
    padding: 16px 0 8px;
    flex-direction: column;
    gap: 4px;
  }
  .mobile-nav.show { display: flex; }
  .mobile-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 0.95rem;
  }
  .mobile-nav .nav-cta { margin-top: 10px; justify-content: center; }
  .section { padding: 60px 0; }
  .section-head h2 { font-size: 1.8rem; }
  .hero { padding: 64px 0; }
  .hero h1 { font-size: 2rem; }
  .hero p.lead { font-size: 1rem; }
  .hero-stats { gap: 24px; }
  .hero-stats .stat-item strong { font-size: 1.5rem; }
  .post-card { flex-direction: column; padding: 22px; gap: 12px; }
  .post-card .post-index { width: 44px; height: 44px; font-size: 1.1rem; border-radius: 10px; }
  .cta-section h2 { font-size: 1.7rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 575.98px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .brand { font-size: 1.15rem; }
  .brand .brand-icon { width: 36px; height: 36px; font-size: 0.95rem; }
  .hero h1 { font-size: 1.7rem; }
  .hero-buttons .btn-hero { padding: 12px 24px; font-size: 0.92rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .stat-block .stat-num { font-size: 2.2rem; }
  .process-grid { grid-template-columns: 1fr; gap: 18px; }
  .category-entry .category-content { padding: 32px 22px; }
  .category-content h2 { font-size: 1.6rem; }
  .faq-question { padding: 20px 18px; font-size: 0.95rem; }
  .faq-answer p { padding: 0 18px 20px; }
  .cta-section { padding: 40px 20px; }
  .cta-section h2 { font-size: 1.5rem; }
  .site-footer { margin-top: 60px; }
}

/* roulang page: article */
:root {
            --primary: #1A56DB;
            --primary-dark: #0F3D9E;
            --primary-light: #E8F0FE;
            --accent: #F5A623;
            --accent-light: #FFF4D6;
            --bg: #F5F7FB;
            --surface: #FFFFFF;
            --text: #1F2A44;
            --text-weak: #6B7A99;
            --border: #E4EAF3;
            --radius-1: 10px;
            --radius-2: 16px;
            --radius-3: 24px;
            --shadow-sm: 0 2px 10px rgba(31, 42, 68, .05);
            --shadow-md: 0 10px 30px rgba(26, 86, 219, .08);
            --shadow-lg: 0 20px 50px rgba(26, 86, 219, .15);
            --transition: all .25s ease;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            color: var(--text);
            line-height: 1.3;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
        }
        .container {
            max-width: 1240px;
            padding-left: 20px;
            padding-right: 20px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1030;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 20px rgba(31, 42, 68, .04);
        }
        .site-header .inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.3px;
            transition: var(--transition);
        }
        .brand:hover {
            color: var(--primary);
            transform: translateY(-1px);
        }
        .brand-icon {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary), #2D7AFF);
            color: #fff;
            border-radius: 12px;
            font-size: 18px;
            box-shadow: 0 6px 18px rgba(26, 86, 219, .3);
        }
        .site-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .site-nav .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 9px 20px;
            border-radius: 999px;
            font-size: 14.5px;
            font-weight: 500;
            color: var(--text);
            background: transparent;
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .site-nav .nav-link i {
            font-size: 13px;
            opacity: .75;
        }
        .site-nav .nav-link:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: rgba(26, 86, 219, .12);
        }
        .site-nav .nav-link.active {
            background: var(--primary);
            color: #fff;
            border-color: transparent;
            box-shadow: 0 6px 20px rgba(26, 86, 219, .32);
        }
        .site-nav .nav-link.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }
        .site-nav .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 9px 20px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
            background: var(--accent-light);
            border: 1px solid rgba(245, 166, 35, .28);
            transition: var(--transition);
            margin-left: 4px;
        }
        .site-nav .nav-cta:hover {
            background: var(--accent);
            color: var(--text);
            border-color: transparent;
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(245, 166, 35, .35);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 22px;
            color: var(--text);
            cursor: pointer;
            width: 42px;
            height: 42px;
            border-radius: 10px;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .mobile-nav {
            display: none;
            padding: 12px 20px 20px;
            background: #fff;
            border-top: 1px solid var(--border);
            flex-direction: column;
            gap: 6px;
        }
        .mobile-nav.open {
            display: flex;
        }
        .mobile-nav .nav-link,
        .mobile-nav .nav-cta {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 16px;
            border-radius: 12px;
            font-size: 15px;
            color: var(--text);
            background: var(--bg);
        }
        .mobile-nav .nav-link i,
        .mobile-nav .nav-cta i {
            font-size: 14px;
            color: var(--primary);
        }
        .mobile-nav .nav-link.active {
            background: var(--primary);
            color: #fff;
        }
        .mobile-nav .nav-link.active i {
            color: #fff;
        }
        .mobile-nav .nav-cta {
            background: var(--accent-light);
            font-weight: 600;
        }
        .btn {
            border-radius: 12px;
            padding: 12px 28px;
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 20px rgba(26, 86, 219, .28);
        }
        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(26, 86, 219, .38);
        }
        .btn-outline-light {
            border: 1px solid rgba(255, 255, 255, .75);
            color: #fff;
            background: transparent;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, .14);
            color: #fff;
            border-color: #fff;
        }
        .btn-lg {
            padding: 14px 36px;
        }
        .article-hero {
            padding: 92px 0 74px;
            background: linear-gradient(130deg, rgba(12, 35, 90, .94) 10%, rgba(26, 86, 219, .82) 60%, rgba(27, 120, 255, .68)), url('/assets/images/backpic/back-1.png') center 30% / cover no-repeat;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            right: -100px;
            bottom: -100px;
            width: 300px;
            height: 300px;
            background: rgba(255, 255, 255, .06);
            border-radius: 50%;
            pointer-events: none;
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, .75);
            margin-bottom: 22px;
        }
        .breadcrumb-nav a {
            color: rgba(255, 255, 255, .85);
        }
        .breadcrumb-nav a:hover {
            color: #fff;
        }
        .breadcrumb-nav .sep {
            opacity: .5;
        }
        .article-category {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            background: rgba(255, 255, 255, .15);
            border: 1px solid rgba(255, 255, 255, .25);
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            color: #fff;
            letter-spacing: .4px;
            margin-bottom: 20px;
            backdrop-filter: blur(8px);
        }
        .article-title {
            font-size: clamp(32px, 5vw, 52px);
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            letter-spacing: -.5px;
            margin: 0 0 18px;
            max-width: 880px;
            text-shadow: 0 4px 30px rgba(0, 0, 0, .25);
        }
        .article-desc {
            font-size: 17px;
            line-height: 1.8;
            color: rgba(255, 255, 255, .85);
            max-width: 720px;
            margin-bottom: 26px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 18px;
            font-size: 14px;
            color: rgba(255, 255, 255, .75);
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }
        .article-meta i {
            font-size: 13px;
            opacity: .8;
        }
        .article-body {
            padding: 60px 0 80px;
        }
        .article-card {
            background: var(--surface);
            border-radius: var(--radius-3);
            box-shadow: var(--shadow-md);
            padding: clamp(24px, 4vw, 50px);
            border: 1px solid var(--border);
        }
        .article-content {
            font-size: 16.5px;
            line-height: 1.95;
            color: var(--text);
        }
        .article-content>p:first-child::first-letter {
            font-size: 42px;
            font-weight: 700;
            color: var(--primary);
            float: left;
            line-height: 1;
            padding: 4px 10px 0 0;
        }
        .article-content h2 {
            font-size: 26px;
            font-weight: 700;
            margin: 42px 0 18px;
            color: var(--text);
            position: relative;
            padding-left: 18px;
        }
        .article-content h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 6px;
            bottom: 6px;
            width: 4px;
            border-radius: 4px;
            background: linear-gradient(180deg, var(--primary), #2D7AFF);
        }
        .article-content h3 {
            font-size: 21px;
            font-weight: 600;
            margin: 32px 0 14px;
            color: var(--text);
        }
        .article-content p {
            margin-bottom: 22px;
            color: #2A3651;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 24px;
            padding-left: 24px;
        }
        .article-content li {
            margin-bottom: 10px;
            color: #2A3651;
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 18px 24px;
            border-radius: 0 var(--radius-1) var(--radius-1) 0;
            margin: 28px 0;
            color: var(--text);
            font-style: italic;
        }
        .article-content img {
            border-radius: var(--radius-2);
            margin: 28px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-tags {
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag {
            display: inline-block;
            padding: 6px 14px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 999px;
            font-size: 13px;
            color: var(--text-weak);
            transition: var(--transition);
        }
        .tag:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: rgba(26, 86, 219, .2);
        }
        .tag-primary {
            background: var(--primary-light);
            color: var(--primary);
            border-color: transparent;
            font-weight: 600;
        }
        .sidebar {
            position: sticky;
            top: 96px;
        }
        .sidebar-card {
            background: var(--surface);
            border-radius: var(--radius-2);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            padding: 26px;
            margin-bottom: 24px;
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 18px;
            padding-bottom: 14px;
            border-bottom: 2px solid var(--primary-light);
            color: var(--text);
        }
        .sidebar-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .sidebar-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px dashed var(--border);
        }
        .sidebar-list li:last-child {
            border-bottom: none;
        }
        .sidebar-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary);
            margin-top: 9px;
            flex-shrink: 0;
        }
        .sidebar-list a {
            flex: 1;
            font-size: 14.5px;
            font-weight: 500;
            color: var(--text);
            line-height: 1.5;
            display: block;
        }
        .sidebar-list a:hover {
            color: var(--primary);
        }
        .sidebar-list em {
            font-style: normal;
            font-size: 12px;
            color: var(--text-weak);
            background: var(--bg);
            padding: 2px 10px;
            border-radius: 999px;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .not-found-card {
            text-align: center;
            padding: 80px 30px;
            background: var(--surface);
            border-radius: var(--radius-3);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border);
        }
        .not-found-icon {
            width: 84px;
            height: 84px;
            margin: 0 auto 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            border-radius: 50%;
            font-size: 32px;
            color: var(--primary);
        }
        .not-found-card h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 14px;
        }
        .not-found-card p {
            color: var(--text-weak);
            font-size: 16px;
            margin-bottom: 32px;
        }
        .related-section {
            padding: 70px 0;
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .section-head {
            text-align: center;
            margin-bottom: 46px;
        }
        .section-head .section-tag {
            display: inline-block;
            padding: 6px 18px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: .5px;
            margin-bottom: 14px;
        }
        .section-head h2 {
            font-size: clamp(28px, 4vw, 38px);
            font-weight: 800;
            margin-bottom: 12px;
        }
        .section-head p {
            color: var(--text-weak);
            font-size: 16px;
            max-width: 600px;
            margin: 0 auto;
        }
        .related-card {
            display: block;
            background: var(--bg);
            border-radius: var(--radius-2);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            height: 100%;
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(26, 86, 219, .18);
        }
        .related-thumb {
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--primary-dark);
            position: relative;
        }
        .related-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .45s ease;
        }
        .related-card:hover .related-thumb img {
            transform: scale(1.06);
        }
        .related-thumb .thumb-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 60%, rgba(15, 45, 110, .35));
        }
        .related-body {
            padding: 22px;
        }
        .related-body .tag {
            margin-bottom: 10px;
            display: inline-block;
        }
        .related-body h3 {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.45;
            color: var(--text);
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-body p {
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.7;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-meta {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-weak);
        }
        .related-meta i {
            font-size: 12px;
        }
        .faq-section {
            padding: 80px 0;
            background: var(--bg);
        }
        .faq-wrapper {
            max-width: 840px;
            margin: 0 auto;
        }
        .accordion-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-1) !important;
            margin-bottom: 14px;
            overflow: hidden;
            background: var(--surface);
            box-shadow: var(--shadow-sm);
        }
        .accordion-button {
            font-size: 16px;
            font-weight: 600;
            padding: 18px 24px;
            color: var(--text);
            background: var(--surface);
            border: none;
            gap: 12px;
        }
        .accordion-button:not(.collapsed) {
            background: var(--primary-light);
            color: var(--primary);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(26, 86, 219, .15);
            border-color: transparent;
        }
        .accordion-button::after {
            flex-shrink: 0;
            margin-left: auto;
        }
        .accordion-body {
            padding: 4px 24px 22px;
            color: var(--text-weak);
            font-size: 15px;
            line-height: 1.8;
            background: var(--surface);
        }
        .cta-section {
            padding: 80px 0 90px;
        }
        .cta-box {
            background: linear-gradient(135deg, #0F3D9E 0%, #1A56DB 55%, #2D7AFF 100%);
            border-radius: var(--radius-3);
            padding: clamp(40px, 6vw, 70px);
            color: #fff;
            position: relative;
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(26, 86, 219, .35);
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 220px;
            height: 220px;
            background: rgba(255, 255, 255, .1);
            border-radius: 50%;
        }
        .cta-box::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: 20%;
            width: 180px;
            height: 180px;
            background: rgba(255, 255, 255, .07);
            border-radius: 50%;
        }
        .cta-box h2 {
            color: #fff;
            font-size: clamp(26px, 4vw, 36px);
            font-weight: 800;
            margin-bottom: 16px;
            position: relative;
            z-index: 2;
        }
        .cta-box p {
            color: rgba(255, 255, 255, .85);
            font-size: 16px;
            max-width: 560px;
            margin-bottom: 30px;
            position: relative;
            z-index: 2;
        }
        .cta-box .btn {
            position: relative;
            z-index: 2;
        }
        .site-footer {
            background: #0E1630;
            color: #A5B2D4;
            padding: 70px 0 30px;
            font-size: 14px;
        }
        .site-footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 18px;
        }
        .site-footer .brand-icon {
            background: linear-gradient(135deg, #1A56DB, #2D7AFF);
            box-shadow: 0 6px 20px rgba(26, 86, 219, .3);
        }
        .footer-desc {
            color: #8C9AC3;
            line-height: 1.8;
            max-width: 340px;
            margin-bottom: 0;
        }
        .footer-title {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 28px;
            height: 3px;
            border-radius: 4px;
            background: var(--accent);
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #8C9AC3;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-links a i {
            font-size: 11px;
            color: var(--primary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .08);
            margin-top: 50px;
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            color: #6C7BA3;
            font-size: 13px;
        }
        .footer-bottom p {
            margin: 0;
        }
        @media (max-width: 991.98px) {
            .desktop-nav {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .mobile-nav {
                display: none;
            }
            .article-body {
                padding: 40px 0 60px;
            }
            .sidebar {
                position: static;
                margin-top: 30px;
            }
        }
        @media (max-width: 767.98px) {
            .article-hero {
                padding: 60px 0 45px;
            }
            .article-title {
                font-size: 28px;
                line-height: 1.25;
            }
            .article-desc {
                font-size: 15px;
            }
            .article-meta {
                gap: 12px;
                flex-direction: column;
                align-items: flex-start;
            }
            .article-card {
                padding: 22px;
            }
            .article-content {
                font-size: 15.5px;
            }
            .article-content h2 {
                font-size: 22px;
                padding-left: 14px;
            }
            .article-content blockquote {
                padding: 14px 18px;
            }
            .section-head {
                margin-bottom: 32px;
            }
            .cta-box {
                padding: 32px 24px;
            }
            .cta-box .btn {
                width: 100%;
                justify-content: center;
            }
            .site-footer {
                padding-top: 50px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .site-header .inner {
                height: 64px;
            }
            .brand {
                font-size: 19px;
            }
            .brand-icon {
                width: 36px;
                height: 36px;
                font-size: 15px;
            }
            .article-card {
                padding: 18px;
                border-radius: 14px;
            }
            .related-body {
                padding: 18px;
            }
            .sidebar-card {
                padding: 20px;
            }
        }

/* roulang page: category1 */
:root {
  --primary: #0b2e4f;
  --primary-dark: #071e35;
  --primary-light: #163d63;
  --accent: #00c896;
  --accent-dark: #00a67d;
  --accent-light: #d5f7ef;
  --bg: #f4f7fa;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --text: #182837;
  --text-muted: #5b6b7b;
  --border: #e2e8f0;
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 8px rgba(15, 34, 58, 0.06);
  --shadow: 0 12px 32px rgba(15, 34, 58, 0.10);
  --shadow-lg: 0 24px 48px rgba(15, 34, 58, 0.14);
  --transition: all 0.25s ease;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

/* ===== Header ===== */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1050;
  box-shadow: 0 2px 12px rgba(15, 34, 58, 0.05);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 0.02em;
  text-decoration: none;
}

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

.brand-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--accent), #00e0a8);
  color: #fff;
  font-size: 1.1rem;
  box-shadow: 0 6px 16px rgba(0, 200, 150, 0.35);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-link i {
  font-size: 0.9rem;
}

.nav-link:hover {
  color: var(--primary);
  background: var(--bg-alt);
}

.nav-link:focus-visible {
  outline: 3px solid rgba(0, 200, 150, 0.4);
  outline-offset: 2px;
}

.nav-link.active {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 4px 14px rgba(11, 46, 79, 0.25);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 20px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
  border: 0;
  box-shadow: 0 4px 14px rgba(0, 200, 150, 0.3);
}

.nav-cta:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0, 200, 150, 0.4);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--primary);
  font-size: 1.2rem;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.nav-toggle:hover {
  background: var(--bg-alt);
  border-color: var(--accent);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 10px;
  padding: 6px 20px 20px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.mobile-nav .nav-link,
.mobile-nav .nav-cta {
  width: 100%;
  justify-content: center;
  padding: 14px 18px;
}

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

/* ===== Category Hero ===== */
.category-hero {
  position: relative;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: #fff;
  padding: 110px 0 90px;
  overflow: hidden;
}

.category-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(7, 30, 53, 0.92), rgba(11, 46, 79, 0.75), rgba(0, 200, 150, 0.25));
  z-index: 1;
}

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

.category-hero .inner {
  max-width: 760px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
  color: #eafff8;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 999px;
  margin-bottom: 22px;
  letter-spacing: 0.02em;
}

.category-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  color: #fff;
  letter-spacing: 0.01em;
}

.category-hero h1 span {
  color: var(--accent);
}

.category-hero .lead-text {
  font-size: 1.12rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 34px;
  max-width: 640px;
}

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

.btn-accent,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  border: 0;
  cursor: pointer;
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 200, 150, 0.35);
}

.btn-accent:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 200, 150, 0.45);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
  transform: translateY(-2px);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  margin-top: 36px;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.85);
}

.hero-meta i {
  color: var(--accent);
}

/* ===== Section spacing ===== */
.section {
  padding: 90px 0;
}

.section-alt {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 54px;
}

.section-head .section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent-dark);
  background: var(--accent-light);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.3;
  margin-bottom: 14px;
}

.section-head p {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 0;
}

/* ===== Guide Intro ===== */
.intro-wrap {
  display: flex;
  align-items: center;
  gap: 50px;
  flex-wrap: wrap;
}

.intro-media {
  flex: 1 1 420px;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.intro-media img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.intro-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7, 30, 53, 0.5), transparent 50%);
  pointer-events: none;
}

.intro-media .float-badge {
  position: absolute;
  left: 20px;
  bottom: 20px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.92rem;
  padding: 10px 18px;
  border-radius: 999px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.intro-content {
  flex: 1 1 380px;
}

.intro-content .intro-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-dark);
  background: var(--accent-light);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.intro-content h2 {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.3;
  margin-bottom: 18px;
}

.intro-content p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.intro-points {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 24px;
}

.intro-point {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.intro-point i {
  color: var(--accent);
  flex-shrink: 0;
}

/* ===== Topic cards ===== */
.topic-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.topic-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 200, 150, 0.4);
}

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

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

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

.topic-card .card-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(11, 46, 79, 0.35), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.topic-card:hover .card-media::after {
  opacity: 1;
}

.topic-card .card-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  display: inline-block;
  background: rgba(255, 255, 255, 0.92);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 999px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(6px);
}

.topic-card .card-body {
  padding: 24px 24px 26px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.topic-card h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.topic-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
  flex: 1;
}

.topic-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent-dark);
  text-decoration: none;
  transition: var(--transition);
}

.topic-card .card-link:hover {
  gap: 12px;
  color: var(--primary);
}

.topic-card .card-link i {
  font-size: 0.85rem;
  transition: transform 0.25s ease;
}

/* ===== Learning Path ===== */
.path-section {
  background: var(--primary);
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  background-blend-mode: multiply;
  color: #fff;
}

.path-section .section-head h2 {
  color: #fff;
}

.path-section .section-head p {
  color: rgba(255, 255, 255, 0.7);
}

.path-section .section-tag {
  background: rgba(255, 255, 255, 0.15);
  color: var(--accent);
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.path-step {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(10px);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
}

.path-step:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-6px);
  border-color: rgba(0, 200, 150, 0.5);
}

.path-step .step-num {
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 2.8rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.12);
  line-height: 1;
}

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--accent), #00e0a8);
  color: #fff;
  font-size: 1.6rem;
  box-shadow: 0 8px 22px rgba(0, 200, 150, 0.35);
}

.path-step h3 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: #fff;
}

.path-step p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ===== Latest List ===== */
.latest-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  height: 100%;
  flex-direction: column;
}

.latest-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(0, 200, 150, 0.35);
}

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

.latest-card .latest-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.latest-card .latest-media .badge-soon {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  box-shadow: 0 4px 12px rgba(0, 200, 150, 0.3);
}

.latest-card .latest-body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.latest-card .latest-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

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

.latest-card .latest-meta i {
  color: var(--accent);
}

.latest-card h3 {
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.5;
  margin-bottom: 10px;
  transition: var(--transition);
}

.latest-card h3:hover {
  color: var(--accent-dark);
}

.latest-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
  flex: 1;
}

.latest-card .latest-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.latest-card .read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  color: var(--accent-dark);
  text-decoration: none;
  transition: var(--transition);
}

.latest-card .read-more:hover {
  gap: 10px;
  color: var(--primary);
}

.read-time {
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* ===== Stats ===== */
.stats-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item {
  text-align: center;
  padding: 40px 20px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(0, 200, 150, 0.4);
}

.stat-item .stat-icon {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 14px;
}

.stat-item .stat-num {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.stat-item .stat-label {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ===== FAQ ===== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border) !important;
  border-radius: var(--radius) !important;
  overflow: hidden;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
  background: var(--surface);
}

.faq-item .accordion-button {
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--surface);
  box-shadow: none;
  transition: var(--transition);
}

.faq-item .accordion-button:not(.collapsed) {
  color: var(--accent-dark);
  background: var(--accent-light);
}

.faq-item .accordion-button:focus {
  box-shadow: 0 0 0 3px rgba(0, 200, 150, 0.2);
  border-radius: var(--radius);
}

.faq-item .accordion-body {
  padding: 8px 24px 24px;
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

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

.cta-card {
  position: relative;
  background-image: url('/assets/images/backpic/back-3.png');
  background-size: cover;
  background-position: center;
  border-radius: var(--radius-lg);
  color: #fff;
  padding: 80px 60px;
  text-align: center;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.cta-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(7, 30, 53, 0.92), rgba(11, 46, 79, 0.78), rgba(0, 200, 150, 0.35));
  z-index: 1;
}

.cta-card .cta-inner {
  position: relative;
  z-index: 2;
}

.cta-card h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.cta-card p {
  font-size: 1.08rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.8;
}

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

.btn-light-accent {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  border: 0;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 200, 150, 0.4);
}

.btn-light-accent:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 34px rgba(0, 200, 150, 0.5);
}

.btn-outline-light {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.7);
  color: #fff;
  padding: 12px 30px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #fff;
  color: #fff;
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.75);
  padding: 70px 0 0;
  font-size: 0.95rem;
}

.site-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.footer-desc {
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  margin-bottom: 0;
  max-width: 360px;
}

.site-footer .footer-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}

.site-footer .footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 3px;
  border-radius: 3px;
  background: var(--accent);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  transition: var(--transition);
  padding: 3px 0;
}

.footer-links a i {
  font-size: 0.78rem;
  color: var(--accent);
  transition: transform 0.2s ease;
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 24px 0;
  margin-top: 50px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  color: rgba(255, 255, 255, 0.45);
  font-size: 0.88rem;
}

.footer-bottom p {
  margin: 0;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .section {
    padding: 80px 0;
  }

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

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

  .topic-card .card-body {
    padding: 20px 18px 22px;
  }

  .intro-wrap {
    gap: 30px;
  }

  .cta-card {
    padding: 60px 40px;
  }
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .category-hero {
    padding: 80px 0 64px;
  }

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

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

  .hero-actions .btn-accent,
  .hero-actions .btn-ghost {
    justify-content: center;
  }

  .section {
    padding: 64px 0;
  }

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

  .intro-wrap {
    flex-direction: column;
  }

  .intro-media img {
    height: 320px;
  }

  .intro-points {
    grid-template-columns: 1fr;
  }

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

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

  .stat-item {
    padding: 26px 16px;
  }

  .stat-item .stat-num {
    font-size: 2rem;
  }

  .latest-card .latest-body {
    padding: 18px;
  }

  .cta-card {
    padding: 48px 24px;
    border-radius: 18px;
  }

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

  .cta-actions .btn-light-accent,
  .cta-actions .btn-outline-light {
    justify-content: center;
  }

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

  .site-footer {
    padding: 50px 0 0;
  }
}

@media (max-width: 520px) {
  .category-hero h1 {
    font-size: 1.7rem;
  }

  .category-hero .lead-text {
    font-size: 1rem;
  }

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

  .section {
    padding: 52px 0;
  }

  .section-head h2 {
    font-size: 1.45rem;
  }

  .section-head p {
    font-size: 0.95rem;
  }

  .intro-label {
    font-size: 0.8rem;
  }

  .intro-content h2 {
    font-size: 1.5rem;
  }

  .topic-card h3 {
    font-size: 1.05rem;
  }

  .path-step {
    padding: 26px 18px;
  }

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

  .stat-item {
    padding: 22px 16px;
  }

  .cta-card h2 {
    font-size: 1.35rem;
  }

  .cta-card p {
    font-size: 0.95rem;
  }

  .btn-accent,
  .btn-ghost,
  .btn-light-accent,
  .btn-outline-light {
    padding: 12px 22px;
    font-size: 0.95rem;
  }

  .site-header .inner {
    height: 64px;
  }

  .brand {
    font-size: 1.1rem;
  }

  .brand-icon {
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
  }
}