/* roulang page: index */
:root {
    --primary: #0e2a47;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --bg-soft: #f0f5fa;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 0.75rem;
    --radius-lg: 1.25rem;
    --shadow: 0 4px 20px rgba(14, 42, 71, 0.08);
    --shadow-hover: 0 8px 30px rgba(14, 42, 71, 0.14);
    --space-section: 5rem;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
    color: var(--text);
    background: #ffffff;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
  }

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

  a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
  }

  button,
  input {
    font-family: inherit;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
  }

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

  /* ===== Header / Nav ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.7);
    transition: box-shadow 0.3s ease;
  }

  .site-header.scrolled {
    box-shadow: 0 2px 16px rgba(14, 42, 71, 0.08);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 1.5rem;
  }

  .logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.02em;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--secondary), #06b6d4);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.1rem;
    flex-shrink: 0;
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
  }

  .main-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    padding: 0.5rem 0.25rem;
    position: relative;
    white-space: nowrap;
  }

  .main-nav a:hover {
    color: var(--primary);
  }

  .main-nav a.active {
    color: var(--primary);
    font-weight: 600;
  }

  .main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--secondary);
    border-radius: 2px;
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
  }

  .header-search {
    position: relative;
    display: none;
  }

  @media (min-width: 1024px) {
    .header-search {
      display: block;
    }
  }

  .header-search input {
    width: 180px;
    height: 38px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--bg-soft);
    padding: 0 0.75rem 0 2.2rem;
    font-size: 0.85rem;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .header-search input:focus {
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
    background: #fff;
  }

  .header-search svg {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    pointer-events: none;
  }

  .btn-header {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    height: 38px;
    padding: 0 1.25rem;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s ease;
    white-space: nowrap;
  }

  .btn-header:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(14, 42, 71, 0.2);
  }

  .hamburger-btn {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #fff;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--primary);
  }

  @media (max-width: 768px) {
    .main-nav {
      display: none;
    }
    .header-search {
      display: none;
    }
    .btn-header {
      display: none;
    }
    .hamburger-btn {
      display: flex;
    }
  }

  .mobile-nav {
    display: none;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    flex-direction: column;
    gap: 0.75rem;
  }

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

  .mobile-nav a {
    padding: 0.6rem 0.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    color: var(--text);
  }

  .mobile-nav a:hover {
    background: var(--bg-soft);
  }

  .mobile-nav a.active {
    color: var(--secondary);
    background: rgba(14, 165, 233, 0.08);
  }

  /* ===== Hero ===== */
  .hero {
    position: relative;
    min-height: 560px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(120deg, #0b2238 0%, #0e2a47 55%, #123a5c 100%);
  }

  .hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
    opacity: 0.35;
  }

  .hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(11, 34, 56, 0.95) 0%, rgba(14, 42, 71, 0.7) 65%, rgba(18, 58, 92, 0.4) 100%);
  }

  .hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
    align-items: center;
  }

  @media (max-width: 1024px) {
    .hero {
      min-height: 480px;
    }
    .hero-content {
      grid-template-columns: 1fr;
      gap: 2rem;
    }
    .hero-visual {
      display: none;
    }
  }

  .hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(14, 165, 233, 0.15);
    border: 1px solid rgba(14, 165, 233, 0.3);
    color: #7dd3fc;
    padding: 0.4rem 1rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(4px);
  }

  .hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.2;
    color: #fff;
    margin-bottom: 1.25rem;
    letter-spacing: -0.02em;
  }

  @media (max-width: 520px) {
    .hero h1 {
      font-size: 1.9rem;
    }
  }

  .hero p {
    color: #94a3b8;
    font-size: 1.05rem;
    max-width: 480px;
    margin-bottom: 2rem;
  }

  .hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--secondary), #06b6d4);
    color: #fff;
    font-weight: 600;
    padding: 0.8rem 1.8rem;
    border-radius: 999px;
    border: none;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.3);
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.4);
  }

  .btn-outline-light {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    color: #fff;
    font-weight: 500;
    padding: 0.75rem 1.6rem;
    border-radius: 999px;
    font-size: 0.95rem;
    backdrop-filter: blur(4px);
    transition: all 0.25s ease;
  }

  .btn-outline-light:hover {
    border-color: #fff;
    background: rgba(255, 255, 255, 0.1);
  }

  .hero-meta {
    display: flex;
    gap: 2rem;
    margin-top: 2.5rem;
    flex-wrap: wrap;
  }

  .hero-meta-item {
    color: #cbd5e1;
    font-size: 0.9rem;
  }

  .hero-meta-item strong {
    font-size: 1.4rem;
    color: #fff;
    display: block;
    font-weight: 700;
  }

  .hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .hero-card-stack {
    position: relative;
    width: 100%;
    max-width: 420px;
  }

  .hero-card-main {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  }

  .hero-card-main .card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent), #f97316);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 1rem;
  }

  /* ===== Section headers ===== */
  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(14, 165, 233, 0.08);
    color: var(--secondary);
    padding: 0.35rem 1rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border: 1px solid rgba(14, 165, 233, 0.12);
  }

  .section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text);
    line-height: 1.3;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
  }

  @media (max-width: 520px) {
    .section-title {
      font-size: 1.5rem;
    }
  }

  .section-desc {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 640px;
  }

  /* ===== Intro cards ===== */
  .intro-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
    height: 100%;
  }

  .intro-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
    border-color: rgba(14, 165, 233, 0.3);
  }

  .intro-card .icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
  }

  .icon-blue {
    background: rgba(14, 165, 233, 0.1);
  }

  .icon-orange {
    background: rgba(245, 158, 11, 0.1);
  }

  .icon-green {
    background: rgba(16, 185, 129, 0.1);
  }

  .intro-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
  }

  .intro-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
  }

  /* ===== Category cards ===== */
  .category-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    height: 280px;
    display: flex;
    align-items: flex-end;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
  }

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

  .category-card img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .category-card .overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.75) 100%);
    z-index: 1;
  }

  .category-card .content {
    position: relative;
    z-index: 2;
    padding: 1.5rem;
    color: #fff;
    width: 100%;
  }

  .category-card .content .tag {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.2rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    backdrop-filter: blur(4px);
  }

  .category-card .content h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
  }

  .category-card .content p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
  }

  .category-card .link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.85rem;
    color: #7dd3fc;
    transition: gap 0.2s;
  }

  .category-card:hover .link-arrow {
    gap: 0.5rem;
  }

  /* ===== Article list ===== */
  .latest-section {
    background: var(--bg-soft);
  }

  .article-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
  }

  .article-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
  }

  .article-card .thumb {
    position: relative;
    height: 180px;
    overflow: hidden;
  }

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

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

  .article-card .thumb .cat-tag {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: rgba(14, 165, 233, 0.9);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.75rem;
    border-radius: 999px;
    z-index: 2;
  }

  .article-card .body {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    flex: 1;
  }

  .article-card .body h3 {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    color: var(--text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .article-card .body h3 a:hover {
    color: var(--secondary);
  }

  .article-card .body p {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0.75rem;
  }

  .article-card .meta {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: #94a3b8;
  }

  /* ===== Stats ===== */
  .stats-section {
    background: linear-gradient(135deg, var(--primary) 0%, #0b2238 100%);
    padding: 4.5rem 0;
    color: #fff;
  }

  .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
  }

  @media (max-width: 768px) {
    .stats-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  .stat-item .num {
    font-size: 2.2rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
  }

  .stat-item .label {
    color: #94a3b8;
    font-size: 0.9rem;
    margin-top: 0.25rem;
  }

  .stat-item .bar {
    width: 36px;
    height: 3px;
    background: var(--secondary);
    margin: 0.75rem auto;
    border-radius: 2px;
  }

  /* ===== Steps ===== */
  .step-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    height: 100%;
    transition: all 0.3s;
  }

  .step-card:hover {
    box-shadow: var(--shadow-hover);
  }

  .step-num {
    width: 44px;
    height: 44px;
    margin: 0 auto 1rem;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--secondary), #06b6d4);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
  }

  .step-card h3 {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
  }

  .step-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
  }

  /* ===== FAQ ===== */
  .faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.2s;
  }

  .faq-item:hover {
    border-color: rgba(14, 165, 233, 0.3);
  }

  .faq-item details {
    cursor: pointer;
  }

  .faq-item summary {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    list-style: none;
  }

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

  .faq-item summary::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--secondary);
    flex-shrink: 0;
  }

  .faq-item .faq-answer {
    margin-top: 0.75rem;
    padding-left: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
  }

  /* ===== CTA ===== */
  .cta-section {
    padding: 5rem 0;
  }

  .cta-card {
    background: linear-gradient(120deg, var(--primary) 0%, #0b2238 100%);
    border-radius: 1.5rem;
    padding: 3rem 2.5rem;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
  }

  .cta-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: rgba(14, 165, 233, 0.2);
    filter: blur(60px);
  }

  .cta-card h2 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    position: relative;
  }

  .cta-card p {
    color: #94a3b8;
    max-width: 500px;
    margin: 0 auto 1.5rem;
    position: relative;
  }

  .cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
  }

  /* ===== Footer ===== */
  .site-footer {
    background: #0a1929;
    color: #94a3b8;
    padding: 4rem 0 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 2.5rem;
  }

  @media (max-width: 768px) {
    .footer-grid {
      grid-template-columns: 1fr;
      gap: 2rem;
    }
  }

  .footer-brand .logo {
    color: #fff;
    margin-bottom: 1rem;
  }

  .footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 320px;
  }

  .footer-links h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
  }

  .footer-links a {
    display: block;
    color: #94a3b8;
    font-size: 0.9rem;
    padding: 0.3rem 0;
    transition: color 0.2s;
  }

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

  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 1.25rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: #64748b;
  }

  /* ===== Focus states ===== */
  a:focus-visible,
  button:focus-visible,
  input:focus-visible {
    outline: 3px solid rgba(14, 165, 233, 0.4);
    outline-offset: 2px;
  }

  /* ===== Responsive tweaks ===== */
  @media (max-width: 1024px) {
    .hero {
      min-height: 500px;
    }
    .hero-content {
      grid-template-columns: 1fr;
    }
    .hero-visual {
      display: none;
    }
  }

  @media (max-width: 768px) {
    .header-inner {
      height: 60px;
    }
    .section-space {
      padding: 3.5rem 0;
    }
    .cta-card {
      padding: 2rem 1.25rem;
    }
    .footer-grid {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 520px) {
    .hero {
      min-height: 440px;
    }
    .hero h1 {
      font-size: 1.65rem;
    }
    .hero-buttons {
      flex-direction: column;
      align-items: stretch;
    }
    .btn-primary,
    .btn-outline-light {
      justify-content: center;
    }
    .stats-grid {
      grid-template-columns: 1fr 1fr;
    }
  }

/* roulang page: category1 */
:root {
    --brand: #0d9488;
    --brand-dark: #0f766e;
    --brand-deep: #134e4a;
    --accent: #f59e0b;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --muted: #64748b;
    --border: #e2e8f0;
    --radius: 16px;
    --radius-lg: 24px;
    --shadow-sm: 0 2px 12px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 6px 24px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

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

  html { scroll-behavior: smooth; }

  body {
    margin: 0;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
  }

  img { max-width: 100%; height: auto; display: block; }
  a { color: inherit; text-decoration: none; transition: var(--transition); }
  button { font-family: inherit; cursor: pointer; }
  input { font-family: inherit; }

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

  /* ===== Header ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    transition: var(--transition);
  }

  .site-header.scrolled {
    box-shadow: var(--shadow-sm);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 16px;
  }

  .header-left {
    display: flex;
    align-items: center;
    gap: 32px;
    min-width: 0;
  }

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

  .logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
    color: #fff;
    font-weight: 800;
    font-size: 18px;
    border-radius: 12px;
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.35);
  }

  .logo-text {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 0.5px;
    color: var(--text);
    white-space: nowrap;
  }

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

  .main-nav a {
    padding: 8px 18px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 500;
    color: var(--muted);
    white-space: nowrap;
    transition: var(--transition);
  }

  .main-nav a:hover {
    color: var(--brand);
    background: var(--brand-50, #f0fdfa);
  }

  .main-nav a.active {
    color: #fff;
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
    box-shadow: 0 4px 16px rgba(13, 148, 136, 0.3);
    font-weight: 600;
  }

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

  .header-search {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--muted);
    transition: var(--transition);
  }

  .header-search:hover {
    color: var(--brand);
    border-color: var(--brand);
    box-shadow: var(--shadow-sm);
  }

  .nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    font-size: 18px;
    transition: var(--transition);
  }

  .nav-toggle:hover {
    border-color: var(--brand);
    color: var(--brand);
  }

  .mobile-nav {
    display: none;
    padding: 12px 24px 20px;
    background: #fff;
    border-bottom: 1px solid var(--border);
  }

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

  .mobile-nav a {
    display: block;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 4px;
  }

  .mobile-nav a:hover { background: var(--bg); color: var(--brand); }
  .mobile-nav a.active { background: var(--brand); color: #fff; }

  /* ===== Buttons ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    border: 2px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
  }

  .btn:focus-visible {
    outline: 3px solid rgba(13, 148, 136, 0.4);
    outline-offset: 2px;
  }

  .btn-primary {
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.3);
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(13, 148, 136, 0.4);
  }

  .btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
  }

  .btn-outline {
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(8px);
  }

  .btn-outline:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: #fff;
    transform: translateY(-2px);
  }

  .btn-accent {
    background: linear-gradient(135deg, var(--accent) 0%, #ea580c 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
  }

  .btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(245, 158, 11, 0.45);
  }

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

  /* ===== Hero ===== */
  .page-hero {
    position: relative;
    background: linear-gradient(100deg, rgba(15, 23, 42, 0.92) 0%, rgba(19, 78, 74, 0.82) 60%, rgba(13, 148, 136, 0.7) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
    padding: 96px 0 88px;
    color: #fff;
  }

  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 28px;
  }

  .breadcrumb a {
    color: rgba(255, 255, 255, 0.85);
  }

  .breadcrumb a:hover { color: #fff; }
  .breadcrumb i { font-size: 12px; opacity: 0.6; }

  .hero-tagline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.25);
    font-size: 13px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    margin-bottom: 20px;
  }

  .page-hero h1 {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 800;
    line-height: 1.15;
    margin: 0 0 20px;
    letter-spacing: 1px;
  }

  .page-hero h1 span {
    color: var(--accent);
    position: relative;
  }

  .hero-desc {
    max-width: 580px;
    font-size: 18px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
  }

  .hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 36px;
  }

  .hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
    transition: var(--transition);
  }

  .hero-tag:hover {
    background: rgba(255, 255, 255, 0.22);
    transform: translateY(-2px);
  }

  .hero-search {
    display: flex;
    align-items: center;
    gap: 0;
    max-width: 480px;
    background: #fff;
    border-radius: 999px;
    padding: 6px 6px 6px 24px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
  }

  .hero-search i {
    color: var(--muted);
    font-size: 15px;
    margin-right: 10px;
  }

  .hero-search input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 15px;
    color: var(--text);
    background: transparent;
    min-width: 0;
  }

  .hero-search input::placeholder { color: #94a3b8; }

  .hero-search button {
    padding: 10px 24px;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    flex-shrink: 0;
  }

  .hero-search button:hover {
    box-shadow: 0 6px 18px rgba(13, 148, 136, 0.4);
  }

  /* ===== Section spacing ===== */
  .section { padding: 80px 0; }
  .section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 48px;
  }

  .section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--brand);
    background: rgba(13, 148, 136, 0.1);
    padding: 6px 16px;
    border-radius: 999px;
    margin-bottom: 16px;
  }

  .section-header h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    color: var(--text);
    line-height: 1.25;
    margin: 0 0 16px;
    letter-spacing: 0.5px;
  }

  .section-header p {
    font-size: 16px;
    color: var(--muted);
    line-height: 1.8;
    margin: 0;
  }

  /* ===== Stats ===== */
  .stats-strip {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 36px 0;
    margin-top: -1px;
  }

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

  .stat-item {
    text-align: center;
    padding: 12px;
    position: relative;
  }

  .stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -12px;
    top: 20%;
    height: 60%;
    width: 1px;
    background: var(--border);
  }

  .stat-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--brand);
    line-height: 1.2;
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .stat-label {
    font-size: 14px;
    color: var(--muted);
    margin-top: 4px;
  }

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

  .guide-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
  }

  .guide-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(13, 148, 136, 0.3);
  }

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

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

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

  .guide-card-media::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.35) 0%, transparent 45%);
  }

  .guide-level {
    position: absolute;
    top: 14px;
    left: 14px;
    z-index: 2;
    padding: 5px 14px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
    backdrop-filter: blur(6px);
  }

  .guide-level.beginner { background: rgba(13, 148, 136, 0.85); }
  .guide-level.intermediate { background: rgba(245, 158, 11, 0.9); }
  .guide-level.expert { background: rgba(239, 68, 68, 0.85); }

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

  .guide-card-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    align-self: flex-start;
    font-size: 13px;
    font-weight: 600;
    color: var(--brand);
    background: rgba(13, 148, 136, 0.08);
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 12px;
  }

  .guide-card h3 {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.4;
    margin: 0 0 10px;
    color: var(--text);
  }

  .guide-card p {
    font-size: 15px;
    color: var(--muted);
    line-height: 1.75;
    margin: 0 0 20px;
    flex: 1;
  }

  .guide-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--muted);
  }

  .guide-card-meta a {
    color: var(--brand);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }

  .guide-card-meta a:hover { gap: 10px; }

  /* ===== Channel tabs ===== */
  .channel-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
  }

  .channel-tab {
    padding: 9px 24px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: #fff;
    font-size: 14px;
    font-weight: 500;
    color: var(--muted);
    transition: var(--transition);
    cursor: pointer;
  }

  .channel-tab:hover {
    border-color: var(--brand);
    color: var(--brand);
  }

  .channel-tab.active-tab {
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(13, 148, 136, 0.3);
  }

  /* ===== Steps ===== */
  .steps-section {
    background: #fff;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    counter-reset: step;
  }

  .step-card {
    position: relative;
    padding: 32px 28px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
  }

  .step-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(13, 148, 136, 0.25);
  }

  .step-number {
    font-size: 44px;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.3) 0%, rgba(13, 148, 136, 0.08) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
  }

  .step-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin: 0 0 10px;
  }

  .step-card p {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.75;
    margin: 0;
  }

  .step-arrow {
    position: absolute;
    right: -18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--brand);
    font-size: 16px;
    z-index: 2;
  }

  /* ===== Tips horizontal ===== */
  .tips-wrap {
    overflow-x: auto;
    padding-bottom: 16px;
    scrollbar-width: thin;
    scrollbar-color: var(--brand) var(--border);
  }

  .tips-wrap::-webkit-scrollbar { height: 6px; }
  .tips-wrap::-webkit-scrollbar-track { background: var(--border); border-radius: 8px; }
  .tips-wrap::-webkit-scrollbar-thumb { background: var(--brand); border-radius: 8px; }

  .tips-track {
    display: flex;
    gap: 24px;
    min-width: max-content;
    padding: 8px 4px;
  }

  .tip-card {
    width: 340px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
    flex-shrink: 0;
  }

  .tip-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: rgba(13, 148, 136, 0.3);
  }

  .tip-card-num {
    font-size: 14px;
    font-weight: 700;
    color: var(--brand);
    background: rgba(13, 148, 136, 0.1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    margin-bottom: 16px;
  }

  .tip-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin: 0 0 10px;
  }

  .tip-card p {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.75;
    margin: 0;
  }

  /* ===== FAQ ===== */
  .faq-list {
    max-width: 820px;
    margin: 0 auto;
  }

  .faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
  }

  .faq-item:hover {
    border-color: rgba(13, 148, 136, 0.3);
    box-shadow: var(--shadow-sm);
  }

  .faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    list-style: none;
    user-select: none;
    transition: var(--transition);
  }

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

  .faq-item summary:hover { color: var(--brand); }

  .faq-item summary i {
    font-size: 14px;
    color: var(--brand);
    flex-shrink: 0;
    transition: transform 0.3s ease;
  }

  .faq-item[open] summary i {
    transform: rotate(180deg);
  }

  .faq-item .faq-answer {
    padding: 0 24px 20px;
    font-size: 15px;
    color: var(--muted);
    line-height: 1.8;
  }

  /* ===== CTA ===== */
  .cta-section {
    position: relative;
    background: linear-gradient(115deg, rgba(15, 23, 42, 0.94) 0%, rgba(19, 78, 74, 0.88) 100%), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
    padding: 96px 0;
    color: #fff;
    text-align: center;
  }

  .cta-section h2 {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 800;
    margin: 0 0 16px;
  }

  .cta-section p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 540px;
    margin: 0 auto 36px;
    line-height: 1.8;
  }

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

  /* ===== Footer ===== */
  .site-footer {
    background: #0f172a;
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 0;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .footer-brand .logo-icon {
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
    box-shadow: 0 4px 16px rgba(13, 148, 136, 0.4);
  }

  .footer-brand .logo-text { color: #fff; }

  .footer-brand p {
    font-size: 15px;
    line-height: 1.8;
    margin: 0;
    max-width: 340px;
  }

  .footer-links h4 {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    margin: 0 0 20px;
  }

  .footer-links a {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    padding: 6px 0;
    transition: var(--transition);
  }

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

  .footer-bottom {
    padding: 24px 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.4);
    text-align: center;
  }

  .footer-bottom p { margin: 0; }

  /* ===== Responsive ===== */
  @media (max-width: 1024px) {
    .guide-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-item:nth-child(2)::after { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
  }

  @media (max-width: 768px) {
    .header-inner { height: 64px; }
    .main-nav { display: none; }
    .nav-toggle { display: flex; }
    .header-search { display: none; }
    .page-hero { padding: 64px 0 56px; }
    .hero-desc { font-size: 16px; }
    .section { padding: 56px 0; }
    .guide-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .step-arrow { display: none; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .cta-section { padding: 64px 0; }
    .stats-grid { gap: 16px; }
  }

  @media (max-width: 520px) {
    .container { padding: 0 16px; }
    .logo-text { font-size: 18px; }
    .btn { padding: 10px 20px; }
    .hero-search { flex-direction: column; padding: 14px; background: #fff; border-radius: 20px; }
    .hero-search input { width: 100%; padding: 8px 4px; margin-bottom: 10px; font-size: 15px; }
    .hero-search button { width: 100%; justify-content: center; }
    .hero-search i { display: none; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stat-item:nth-child(2)::after { display: none; }
    .stat-number { font-size: 28px; }
    .guide-card-body { padding: 20px; }
    .cta-actions { flex-direction: column; }
    .cta-actions .btn { width: 100%; }
    .footer-grid { gap: 24px; }
  }

/* roulang page: article */
:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --primary-light: #e0f2fe;
    --accent: #f59e0b;
    --accent-light: #fef3c7;
    --bg: #f8fafc;
    --bg-white: #ffffff;
    --bg-dark: #0f172a;
    --bg-dark-2: #1e293b;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 18px;
    --radius-sm: 12px;
    --radius-xs: 8px;
    --shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
    --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.12);
    --shadow-primary: 0 8px 24px rgba(14, 165, 233, 0.25);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

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

  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
  }

  img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
  }

  input, button, textarea, select {
    font: inherit;
    color: inherit;
  }

  button {
    cursor: pointer;
    background: none;
    border: none;
  }

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

  ul, ol {
    list-style: none;
  }

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

  /* ======== Header & Nav ======== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.7);
    transition: var(--transition);
  }

  .site-header.scrolled {
    box-shadow: var(--shadow);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 16px;
  }

  .logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text);
    white-space: nowrap;
    transition: transform 0.3s ease;
    flex-shrink: 0;
  }

  .logo:hover {
    transform: translateY(-1px);
  }

  .logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: linear-gradient(135deg, #38bdf8, #0284c7);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    box-shadow: var(--shadow-primary);
    transition: var(--transition);
  }

  .logo:hover .logo-icon {
    transform: rotate(-6deg) scale(1.05);
  }

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

  .main-nav a {
    padding: 10px 20px;
    border-radius: 999px;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.925rem;
    transition: var(--transition);
    line-height: 1.4;
    white-space: nowrap;
  }

  .main-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-light);
    transform: translateY(-1px);
  }

  .main-nav a.active {
    color: var(--primary-dark);
    background: var(--primary-light);
    font-weight: 600;
    box-shadow: inset 0 0 0 1px rgba(14, 165, 233, 0.15);
  }

  .mobile-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    transition: var(--transition);
    flex-shrink: 0;
  }

  .mobile-toggle:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    border-color: rgba(14, 165, 233, 0.3);
  }

  .mobile-toggle:focus-visible {
    outline: 3px solid rgba(14, 165, 233, 0.4);
    outline-offset: 2px;
  }

  /* ======== Article Hero ======== */
  .article-hero {
    position: relative;
    min-height: 320px;
    display: flex;
    align-items: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: 72px 0;
    isolation: isolate;
  }

  .hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.72) 50%, rgba(2, 132, 199, 0.55) 100%);
    z-index: -1;
  }

  .article-hero-content {
    position: relative;
    z-index: 1;
    max-width: 820px;
  }

  .breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
  }

  .breadcrumb a {
    color: rgba(255, 255, 255, 0.9);
    transition: color 0.2s;
  }

  .breadcrumb a:hover {
    color: #7dd3fc;
  }

  .breadcrumb i {
    font-size: 0.65rem;
    opacity: 0.6;
  }

  .breadcrumb .current {
    color: #bae6fd;
  }

  .article-hero-content h1 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    line-height: 1.25;
    color: #fff;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
    margin-bottom: 20px;
    word-break: break-word;
  }

  .article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
  }

  .meta-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    font-size: 0.85rem;
    color: #e2e8f0;
    font-weight: 500;
  }

  .meta-badge i {
    color: #7dd3fc;
    font-size: 0.8rem;
  }

  /* ======== Article Layout ======== */
  .article-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 2.5rem;
    padding: 2.5rem 0 3rem;
    align-items: start;
  }

  .article-main {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(226, 232, 240, 0.6);
    padding: 2.5rem;
    transition: var(--transition);
  }

  .article-content {
    font-size: 1.0625rem;
    line-height: 1.9;
    color: var(--text);
    word-break: break-word;
  }

  .article-content p {
    margin-bottom: 1.4em;
  }

  .article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 2.2em 0 0.8em;
    color: var(--text);
    line-height: 1.3;
    letter-spacing: -0.01em;
  }

  .article-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 1.8em 0 0.6em;
    color: var(--text);
  }

  .article-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 1.5em 0 0.5em;
    color: var(--text);
  }

  .article-content a {
    color: var(--primary-dark);
    border-bottom: 1px solid rgba(14, 165, 233, 0.3);
    transition: var(--transition);
    font-weight: 500;
  }

  .article-content a:hover {
    color: var(--primary);
    border-bottom-color: var(--primary);
  }

  .article-content strong {
    font-weight: 700;
    color: #0f172a;
  }

  .article-content blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-light);
    padding: 1rem 1.5rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 1.6em 0;
    color: var(--text-muted);
    font-style: italic;
  }

  .article-content ul:not(.faq-list),
  .article-content ol:not(.faq-list) {
    margin: 1.2em 0;
    padding-left: 0;
  }

  .article-content ul:not(.faq-list) li,
  .article-content ol:not(.faq-list) li {
    position: relative;
    padding-left: 1.8em;
    margin-bottom: 0.6em;
  }

  .article-content ul:not(.faq-list) li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  }

  .article-content ol:not(.faq-list) {
    counter-reset: article-ol;
  }

  .article-content ol:not(.faq-list) li {
    counter-increment: article-ol;
  }

  .article-content ol:not(.faq-list) li::before {
    content: counter(article-ol) ".";
    position: absolute;
    left: 0;
    font-weight: 700;
    color: var(--primary-dark);
  }

  .article-content img {
    border-radius: var(--radius-sm);
    margin: 1.6em auto;
    box-shadow: var(--shadow);
    max-width: 100%;
    height: auto;
  }

  .article-content code {
    background: #f1f5f9;
    padding: 0.2em 0.4em;
    border-radius: 6px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    font-size: 0.9em;
    color: var(--primary-dark);
  }

  .article-content pre {
    background: #0f172a;
    color: #e2e8f0;
    padding: 1.2em 1.5em;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 1.6em 0;
    line-height: 1.7;
  }

  .article-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
  }

  .article-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2em 0;
  }

  /* Article Tags */
  .article-tags {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 2.5rem;
    padding-top: 1.8rem;
    border-top: 1px solid var(--border);
  }

  .article-tags-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }

  .tag-chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 14px;
    border-radius: 999px;
    background: var(--bg);
    border: 1px solid var(--border);
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition);
  }

  .tag-chip:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    border-color: rgba(14, 165, 233, 0.3);
    transform: translateY(-1px);
  }

  /* ======== Sidebar ======== */
  .article-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: 90px;
  }

  .sidebar-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(226, 232, 240, 0.6);
    overflow: hidden;
    transition: var(--transition);
  }

  .sidebar-card:hover {
    box-shadow: var(--shadow-lg);
  }

  .sidebar-card-header {
    padding: 1.2rem 1.5rem 0;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
  }

  .sidebar-card-header i {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary-dark);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
  }

  .sidebar-list {
    padding: 1rem 1.5rem 1.2rem;
  }

  .sidebar-list li + li {
    margin-top: 8px;
  }

  .sidebar-list a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-xs);
    color: var(--text-muted);
    font-size: 0.92rem;
    font-weight: 500;
    transition: var(--transition);
    line-height: 1.4;
  }

  .sidebar-list a:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    transform: translateX(4px);
  }

  .sidebar-list a i {
    font-size: 0.75rem;
    color: var(--primary);
    flex-shrink: 0;
  }

  .sidebar-note {
    padding: 1rem 1.5rem 1.2rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.7;
  }

  .sidebar-btn-wrap {
    padding: 0 1.5rem 1.5rem;
  }

  /* ======== Buttons ======== */
  .btn-primary,
  .btn-outline,
  .btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.4;
    transition: var(--transition);
    border: 1px solid transparent;
    text-align: center;
    white-space: normal;
  }

  .btn-primary {
    background: linear-gradient(135deg, #38bdf8, #0284c7);
    color: #fff;
    box-shadow: var(--shadow-primary);
  }

  .btn-primary:hover {
    background: linear-gradient(135deg, #0ea5e9, #0369a1);
    box-shadow: 0 12px 32px rgba(14, 165, 233, 0.35);
    transform: translateY(-2px);
  }

  .btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.25);
  }

  .btn-outline {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(14, 165, 233, 0.4);
    color: #0284c7;
    backdrop-filter: blur(6px);
  }

  .btn-outline:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary-dark);
    transform: translateY(-2px);
  }

  .btn-ghost {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.4);
  }

  .btn-ghost:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.7);
    transform: translateY(-2px);
  }

  .btn-primary:focus-visible,
  .btn-outline:focus-visible,
  .btn-ghost:focus-visible,
  .main-nav a:focus-visible {
    outline: 3px solid rgba(14, 165, 233, 0.4);
    outline-offset: 2px;
  }

  /* ======== Not Found ======== */
  .not-found {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(226, 232, 240, 0.6);
    padding: 4rem 2.5rem;
    text-align: center;
    max-width: 620px;
    margin: 0 auto;
    grid-column: 1 / -1;
  }

  .not-found-icon {
    width: 96px;
    height: 96px;
    border-radius: 32px;
    background: linear-gradient(135deg, var(--primary-light), #dbeafe);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2.2rem;
    color: var(--primary-dark);
    animation: float 3s ease-in-out infinite;
  }

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

  .not-found h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.8rem;
  }

  .not-found p {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 400px;
    margin: 0 auto 2rem;
  }

  /* ======== Related Section ======== */
  .related-section {
    background: var(--bg-white);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 4rem 0;
  }

  .section-header {
    margin-bottom: 2.5rem;
    text-align: center;
  }

  .section-tagline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    border-radius: 999px;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
  }

  .section-title {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1.25;
    margin-bottom: 0.8rem;
  }

  .section-subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
  }

  .related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
    margin-top: 1rem;
  }

  .related-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(226, 232, 240, 0.6);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
  }

  .related-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(14, 165, 233, 0.25);
  }

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

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

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

  .related-card-category {
    position: absolute;
    top: 14px;
    left: 14px;
    padding: 5px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(6px);
    color: var(--primary-dark);
    font-size: 0.78rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.1);
  }

  .related-card-body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
  }

  .related-card-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.45;
    margin-bottom: 8px;
    transition: color 0.2s;
  }

  .related-card:hover .related-card-body h3 {
    color: var(--primary-dark);
  }

  .related-card-body p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1.2rem;
  }

  .related-card-link {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-dark);
    font-size: 0.9rem;
    font-weight: 600;
    transition: gap 0.3s;
  }

  .related-card:hover .related-card-link {
    gap: 10px;
  }

  /* ======== FAQ Section ======== */
  .faq-section {
    padding: 5rem 0;
    background: var(--bg);
  }

  .faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
  }

  .faq-item {
    background: var(--bg-white);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
  }

  .faq-item:hover {
    border-color: rgba(14, 165, 233, 0.3);
    box-shadow: var(--shadow);
  }

  .faq-item summary {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 1.1rem 1.4rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.98rem;
    color: var(--text);
    list-style: none;
    transition: background 0.2s;
    line-height: 1.4;
  }

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

  .faq-item summary:hover {
    background: rgba(14, 165, 233, 0.04);
  }

  .faq-item summary .faq-number {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary-dark);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
  }

  .faq-item summary .faq-toggle {
    margin-left: auto;
    color: var(--primary);
    font-size: 0.9rem;
    transition: transform 0.3s;
    flex-shrink: 0;
  }

  .faq-item[open] summary .faq-toggle {
    transform: rotate(180deg);
  }

  .faq-answer {
    padding: 0 1.4rem 1.3rem 4.1rem;
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.8;
  }

  .faq-answer p + p {
    margin-top: 0.6em;
  }

  /* ======== CTA Section ======== */
  .cta-section {
    position: relative;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 60%, #0e7490 100%);
    padding: 5rem 0;
    overflow: hidden;
    isolation: isolate;
  }

  .cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/backpic/back-3.png');
    background-size: cover;
    background-position: center;
    opacity: 0.14;
    z-index: -1;
  }

  .cta-section::after {
    content: "";
    position: absolute;
    top: -80px;
    right: -80px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.3), transparent 70%);
    z-index: -1;
  }

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

  .cta-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #bae6fd;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
    backdrop-filter: blur(6px);
  }

  .cta-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    color: #fff;
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
  }

  .cta-desc {
    color: rgba(226, 232, 240, 0.85);
    font-size: 1.05rem;
    margin-bottom: 2rem;
    line-height: 1.7;
  }

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

  /* ======== Footer ======== */
  .site-footer {
    background: var(--bg-dark);
    color: #94a3b8;
    padding-top: 4rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
  }

  .site-footer .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 2.5rem;
  }

  .site-footer .logo {
    color: #fff;
    margin-bottom: 1rem;
  }

  .site-footer .footer-brand p {
    font-size: 0.9rem;
    line-height: 1.8;
    color: #94a3b8;
    max-width: 320px;
  }

  .site-footer .footer-links h4 {
    font-size: 1rem;
    font-weight: 700;
    color: #e2e8f0;
    margin-bottom: 1.2rem;
    letter-spacing: 0.02em;
  }

  .site-footer .footer-links a {
    display: block;
    padding: 6px 0;
    color: #94a3b8;
    font-size: 0.9rem;
    transition: var(--transition);
  }

  .site-footer .footer-links a:hover {
    color: #38bdf8;
    transform: translateX(4px);
  }

  .site-footer .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: #64748b;
  }

  .site-footer .footer-bottom p {
    line-height: 1.6;
  }

  /* ======== Responsive ======== */
  @media (max-width: 1024px) {
    .article-layout {
      grid-template-columns: 1fr 300px;
      gap: 1.8rem;
    }

    .article-main {
      padding: 1.8rem;
    }

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

  @media (max-width: 768px) {
    .header-inner {
      height: 64px;
    }

    .mobile-toggle {
      display: inline-flex;
    }

    .main-nav {
      position: absolute;
      top: 64px;
      left: 16px;
      right: 16px;
      background: var(--bg-white);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      padding: 12px;
      flex-direction: column;
      align-items: stretch;
      gap: 4px;
      display: none;
      border: 1px solid var(--border);
    }

    .main-nav.open {
      display: flex;
      animation: navSlideIn 0.3s ease;
    }

    @keyframes navSlideIn {
      from {
        opacity: 0;
        transform: translateY(-10px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .main-nav a {
      padding: 12px 16px;
      border-radius: 10px;
      font-size: 0.95rem;
    }

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

    .article-hero-content h1 {
      font-size: 1.7rem;
    }

    .article-layout {
      grid-template-columns: 1fr;
      padding: 1.5rem 0 2rem;
      gap: 1.5rem;
    }

    .article-main {
      padding: 1.5rem;
      border-radius: var(--radius-sm);
    }

    .article-content {
      font-size: 1rem;
      line-height: 1.85;
    }

    .article-content h2 {
      font-size: 1.3rem;
    }

    .article-sidebar {
      position: static;
      flex-direction: row;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .sidebar-card {
      flex: 1;
      min-width: 240px;
    }

    .related-grid {
      grid-template-columns: 1fr;
      gap: 1.2rem;
    }

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

    .footer-grid {
      grid-template-columns: 1fr;
      gap: 2rem;
      text-align: center;
      padding-bottom: 2rem;
    }

    .site-footer .footer-brand p {
      margin: 0 auto;
    }

    .site-footer .logo {
      justify-content: center;
    }

    .site-footer .footer-links a:hover {
      transform: none;
    }

    .cta-buttons {
      flex-direction: column;
      width: 100%;
      max-width: 320px;
      margin: 0 auto;
    }

    .cta-buttons .btn-primary,
    .cta-buttons .btn-ghost {
      width: 100%;
    }

    .not-found {
      padding: 3rem 1.5rem;
    }
  }

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

    .article-hero {
      min-height: 220px;
    }

    .article-hero-content h1 {
      font-size: 1.4rem;
    }

    .meta-badge {
      padding: 5px 12px;
      font-size: 0.8rem;
    }

    .article-main {
      padding: 1.2rem;
    }

    .article-tags {
      gap: 8px;
    }

    .tag-chip {
      padding: 4px 10px;
      font-size: 0.78rem;
    }

    .not-found-icon {
      width: 72px;
      height: 72px;
      border-radius: 24px;
      font-size: 1.8rem;
    }

    .not-found h2 {
      font-size: 1.5rem;
    }

    .section-title {
      font-size: 1.5rem;
    }

    .faq-answer {
      padding-left: 1.4rem;
    }
  }

/* roulang page: category2 */
:root {
            --bg: #f6f8fb;
            --surface: #ffffff;
            --primary: #1d6ff2;
            --primary-dark: #155dc7;
            --primary-soft: #e7f0ff;
            --accent: #f59e0b;
            --accent-soft: #fef3c7;
            --text: #0f172a;
            --muted: #64748b;
            --border: #e2e8f0;
            --radius-lg: 24px;
            --radius-md: 16px;
            --radius-sm: 12px;
            --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 12px 40px rgba(15, 23, 42, 0.10);
            --shadow-lg: 0 28px 70px rgba(15, 23, 42, 0.16);
            --max-width: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        button,
        input {
            font: inherit;
        }

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

        /* ===== Header / Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: rgba(255, 255, 255, 0.82);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(15, 23, 42, 0.06);
        }

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

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: 0.01em;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
            color: #fff;
            display: grid;
            place-items: center;
            font-size: 18px;
            font-weight: 800;
            box-shadow: 0 8px 18px rgba(29, 111, 242, 0.30);
        }

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

        .main-nav a {
            padding: 10px 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--muted);
            border-radius: 999px;
            transition: all 0.22s ease;
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--text);
            background: rgba(15, 23, 42, 0.06);
        }

        .main-nav a.active {
            color: #fff;
            background: var(--primary);
            box-shadow: 0 4px 14px rgba(29, 111, 242, 0.32);
        }

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

        .mobile-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border: 1px solid var(--border);
            background: var(--surface);
            border-radius: 14px;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text);
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .mobile-toggle:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 12px 24px;
            border-radius: 999px;
            font-weight: 700;
            font-size: 15px;
            line-height: 1;
            border: 1px solid transparent;
            cursor: pointer;
            transition: all 0.28s ease;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 20px rgba(29, 111, 242, 0.30);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 26px rgba(29, 111, 242, 0.36);
        }

        .btn-ghost {
            background: transparent;
            border-color: var(--border);
            color: var(--text);
        }

        .btn-ghost:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-soft);
        }

        .btn-white {
            background: #fff;
            color: var(--primary);
        }

        .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);
        }

        .btn-outline-light {
            background: transparent;
            border-color: rgba(255, 255, 255, 0.65);
            color: #fff;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Page Hero ===== */
        .page-hero {
            padding: 76px 0 92px;
            background:
                radial-gradient(circle at 85% 20%, rgba(29, 111, 242, 0.10), transparent 32%),
                linear-gradient(135deg, #f0f6ff 0%, #e8f2ff 48%, #ffffff 100%);
            border-bottom: 1px solid rgba(15, 23, 42, 0.04);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
            gap: 56px;
            align-items: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent-soft);
            color: #92400e;
            font-weight: 700;
            font-size: 13px;
            padding: 8px 16px;
            border-radius: 999px;
            margin-bottom: 18px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--muted);
            margin-bottom: 18px;
        }

        .breadcrumb a {
            color: var(--muted);
            transition: color 0.2s;
        }

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

        .breadcrumb i {
            font-size: 10px;
        }

        .hero-content h1 {
            font-size: clamp(34px, 5vw, 52px);
            font-weight: 900;
            letter-spacing: -0.02em;
            line-height: 1.22;
            margin-bottom: 18px;
        }

        .hero-content>p {
            font-size: 17px;
            color: var(--muted);
            max-width: 540px;
            line-height: 1.8;
            margin-bottom: 30px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 38px;
        }

        .hero-stats {
            display: flex;
            gap: 36px;
            flex-wrap: wrap;
        }

        .stat-item strong {
            display: block;
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }

        .stat-item span {
            font-size: 13px;
            color: var(--muted);
        }

        .hero-visual {
            position: relative;
        }

        .hero-visual img {
            width: 100%;
            border-radius: 32px;
            object-fit: cover;
            aspect-ratio: 4 / 3;
            box-shadow: var(--shadow-lg);
            border: 4px solid rgba(255, 255, 255, 0.65);
        }

        .hero-visual::before {
            content: '';
            position: absolute;
            top: -18px;
            right: -18px;
            width: 130px;
            height: 130px;
            background: radial-gradient(closest-side, rgba(245, 158, 11, 0.25), transparent);
            border-radius: 50%;
            z-index: -1;
        }

        /* ===== Section ===== */
        .section {
            padding: 84px 0;
        }

        .section-soft {
            background: #fafbfd;
        }

        .section-head {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            gap: 24px;
            margin-bottom: 42px;
            flex-wrap: wrap;
        }

        .section-eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 800;
            letter-spacing: 0.06em;
            color: var(--primary);
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .section-head h2 {
            font-size: clamp(26px, 3vw, 36px);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.3;
            margin: 0;
        }

        .section-desc {
            color: var(--muted);
            font-size: 15px;
            max-width: 420px;
            text-align: right;
        }

        /* ===== Tag Cloud ===== */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: 999px;
            background: var(--surface);
            border: 1px solid var(--border);
            font-weight: 600;
            font-size: 14px;
            color: var(--text);
            transition: all 0.22s ease;
            cursor: default;
        }

        .tag-chip i {
            color: var(--primary);
            font-size: 13px;
        }

        .tag-chip:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-soft);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

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

        .news-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 20px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .news-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: rgba(29, 111, 242, 0.25);
        }

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

        .news-card .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.45s ease;
        }

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

        .card-tag {
            position: absolute;
            left: 14px;
            top: 14px;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(8px);
            padding: 6px 14px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 700;
            color: var(--primary);
        }

        .card-body {
            padding: 22px;
        }

        .card-meta {
            display: flex;
            gap: 16px;
            font-size: 13px;
            color: var(--muted);
            margin-bottom: 8px;
        }

        .news-card h3 {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.45;
            margin-bottom: 8px;
        }

        .news-card p {
            color: var(--muted);
            font-size: 14px;
            line-height: 1.7;
        }

        /* ===== Two Col ===== */
        .two-col {
            display: grid;
            grid-template-columns: 0.9fr 1.1fr;
            gap: 40px;
            align-items: stretch;
        }

        /* ===== Data Panel ===== */
        .data-panel {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-sm);
        }

        .data-panel h3 {
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 22px;
        }

        .data-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 14px;
        }

        .data-item {
            background: linear-gradient(180deg, #f8fbff, #ffffff);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px 14px;
            text-align: center;
            transition: all 0.25s ease;
        }

        .data-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }

        .data-item strong {
            display: block;
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.3;
        }

        .data-item span {
            font-size: 13px;
            color: var(--muted);
        }

        /* ===== Rank Panel ===== */
        .rank-panel {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-sm);
        }

        .rank-panel h3 {
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 10px;
        }

        .rank-list {
            counter-reset: rank;
        }

        .rank-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 16px 0;
            border-bottom: 1px solid var(--border);
            counter-increment: rank;
        }

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

        .rank-num {
            width: 32px;
            height: 32px;
            border-radius: 10px;
            background: var(--primary-soft);
            color: var(--primary);
            font-weight: 700;
            font-size: 13px;
            display: grid;
            place-items: center;
            flex-shrink: 0;
        }

        .rank-item:nth-child(-n+3) .rank-num {
            background: var(--accent);
            color: #fff;
        }

        .rank-title {
            flex: 1;
            font-weight: 600;
            font-size: 15px;
            line-height: 1.4;
        }

        .rank-hot {
            color: var(--muted);
            font-size: 13px;
            white-space: nowrap;
        }

        /* ===== Feature Block ===== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 32px;
            padding: 40px;
            box-shadow: var(--shadow-sm);
        }

        .feature-image img {
            width: 100%;
            border-radius: 24px;
            object-fit: cover;
            aspect-ratio: 4 / 3;
            box-shadow: var(--shadow-md);
        }

        .feature-content h2 {
            font-size: 30px;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .feature-content>p {
            color: var(--muted);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .feature-points {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 24px;
        }

        .feature-points li {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            font-weight: 500;
        }

        .feature-points li i {
            color: var(--primary);
            margin-top: 5px;
        }

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

        .user-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 28px;
            transition: all 0.3s ease;
        }

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

        .user-stars {
            color: var(--accent);
            margin-bottom: 14px;
            font-size: 14px;
        }

        .user-card blockquote {
            font-size: 15px;
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .user-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid var(--border);
            padding-top: 16px;
        }

        .user-avatar {
            width: 42px;
            height: 42px;
            border-radius: 14px;
            background: var(--primary-soft);
            color: var(--primary);
            font-weight: 800;
            display: grid;
            place-items: center;
            font-size: 16px;
        }

        .user-meta strong {
            display: block;
            font-size: 15px;
        }

        .user-meta span {
            font-size: 13px;
            color: var(--muted);
        }

        /* ===== FAQ ===== */
        .faq-container {
            max-width: 860px;
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 16px;
            transition: box-shadow 0.25s ease;
        }

        .faq-item[open] {
            box-shadow: var(--shadow-md);
        }

        .faq-item summary {
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            padding: 18px 22px;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }

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

        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 14px;
            color: var(--primary);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }

        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }

        .faq-item p {
            padding: 0 22px 20px;
            color: var(--muted);
            line-height: 1.75;
            font-size: 15px;
        }

        /* ===== CTA ===== */
        .cta-panel {
            border-radius: 32px;
            padding: 56px 48px;
            background-size: cover;
            background-position: center;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-panel::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.78), rgba(29, 111, 242, 0.72));
        }

        .cta-panel h2,
        .cta-panel p,
        .cta-actions {
            position: relative;
            z-index: 1;
        }

        .cta-panel h2 {
            font-size: 32px;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 14px;
        }

        .cta-panel p {
            color: rgba(255, 255, 255, 0.85);
            max-width: 480px;
            margin: 0 auto 28px;
            font-size: 16px;
        }

        .cta-actions {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0b1220;
            color: rgba(255, 255, 255, 0.68);
            padding: 72px 0 24px;
            margin-top: 40px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 48px;
        }

        .footer-brand .logo {
            color: #fff;
        }

        .footer-brand p {
            margin-top: 16px;
            line-height: 1.8;
            max-width: 340px;
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
        }

        .footer-links h4 {
            color: #fff;
            margin-bottom: 16px;
            font-size: 16px;
            font-weight: 700;
        }

        .footer-links a {
            display: block;
            color: rgba(255, 255, 255, 0.58);
            margin-bottom: 10px;
            font-size: 14px;
            transition: all 0.2s ease;
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 6px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.10);
            padding-top: 22px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .page-hero {
                padding: 60px 0 72px;
            }

            .hero-grid {
                gap: 32px;
            }

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

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

            .feature-block {
                grid-template-columns: 1fr;
                padding: 28px;
                gap: 28px;
            }

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

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }

            .header-inner {
                height: 64px;
            }

            .main-nav {
                position: fixed;
                top: 64px;
                left: 16px;
                right: 16px;
                background: var(--surface);
                border: 1px solid var(--border);
                border-radius: 20px;
                box-shadow: var(--shadow-lg);
                flex-direction: column;
                align-items: stretch;
                gap: 4px;
                padding: 14px;
                display: none;
            }

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

            .main-nav a {
                padding: 12px 16px;
                text-align: left;
            }

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

            .mobile-toggle {
                display: inline-flex;
            }

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

            .hero-content {
                text-align: center;
            }

            .hero-content>p {
                margin-left: auto;
                margin-right: auto;
            }

            .hero-actions {
                justify-content: center;
            }

            .hero-stats {
                justify-content: center;
                gap: 24px;
            }

            .hero-visual img {
                aspect-ratio: 16 / 10;
            }

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

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

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

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

            .section-head {
                flex-direction: column;
                align-items: flex-start;
            }

            .section-desc {
                text-align: left;
            }

            .cta-panel {
                padding: 40px 20px;
            }

            .cta-panel h2 {
                font-size: 26px;
            }

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

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

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

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

            .stat-item strong {
                font-size: 24px;
            }

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

            .feature-block {
                padding: 20px;
                border-radius: 22px;
            }

            .feature-content h2 {
                font-size: 24px;
            }

            .btn {
                padding: 11px 18px;
                font-size: 14px;
            }

            .cta-panel {
                padding: 32px 18px;
            }

            .cta-panel h2 {
                font-size: 22px;
            }
        }