/* roulang page: index */
:root {
    --bg-primary: #060D1A;
    --bg-secondary: #0C1B30;
    --border-primary: #1E4A6F;
    --accent-primary: #22D8CF;
    --accent-secondary: #38BDF8;
    --text-muted: #8CA3B8;
    --text-body: #E2E8F0;
    --text-heading: #F8FAFC;
    --text-dim: #64748B;
    --radius-card: 1rem;
    --radius-panel: 1.5rem;
    --glow-card: 0 0 40px -12px rgba(34, 216, 207, 0.35);
    --glow-btn: 0 0 30px -6px rgba(34, 216, 207, 0.5);
    --header-h: 80px;
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    background: var(--bg-primary);
    color: var(--text-body);
    line-height: 1.6;
    overflow-x: hidden;
  }
  img { max-width: 100%; display: block; }
  a { text-decoration: none; color: inherit; }
  ul, ol { list-style: none; }
  button, input, textarea { font-family: inherit; font-size: inherit; }
  .container { max-width: 1280px; margin: 0 auto; padding-left: 20px; padding-right: 20px; }
  @media (min-width: 768px) { .container { padding-left: 32px; padding-right: 32px; } }

  /* Header */
  .site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    background: rgba(6, 13, 26, 0.7);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 1000;
    transition: background 0.3s;
  }
  .header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: var(--header-h);
  }
  .logo-link {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.2rem; font-weight: 700; color: var(--text-heading);
    letter-spacing: 0.02em; white-space: nowrap;
  }
  .logo-link:hover { color: var(--accent-primary); }
  .logo-dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--accent-primary);
    box-shadow: 0 0 12px rgba(34, 216, 207, 0.8);
    flex-shrink: 0;
  }
  .main-nav {
    display: flex; align-items: center; gap: 32px;
  }
  .main-nav a {
    font-size: 0.95rem; color: var(--text-muted);
    transition: color 0.2s; position: relative; padding: 4px 0;
    white-space: nowrap;
  }
  .main-nav a:hover { color: var(--accent-primary); }
  .main-nav a.active { color: var(--accent-primary); }
  .main-nav a.active::after {
    content: ''; position: absolute; bottom: -6px; left: 0; right: 0;
    height: 2px; background: var(--accent-primary);
    border-radius: 2px; box-shadow: 0 0 8px rgba(34, 216, 207, 0.6);
  }
  .nav-actions {
    display: flex; align-items: center; gap: 16px;
  }
  .btn-primary {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 24px; border-radius: 9999px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #04121A; font-weight: 700; font-size: 0.9rem;
    border: none; cursor: pointer;
    box-shadow: var(--glow-btn);
    transition: transform 0.25s, box-shadow 0.25s;
  }
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 42px -6px rgba(34, 216, 207, 0.7);
  }
  .btn-primary:active {
    transform: translateY(1px);
  }
  .btn-secondary {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 24px; border-radius: 9999px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff; font-weight: 600; font-size: 0.9rem;
    transition: all 0.25s; cursor: pointer;
  }
  .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
  }
  .hamburger {
    display: none; flex-direction: column; gap: 6px; background: none;
    border: none; cursor: pointer; padding: 6px;
  }
  .hamburger span {
    display: block; width: 22px; height: 2px;
    background: var(--text-heading); border-radius: 2px;
    transition: all 0.3s;
  }
  .mobile-menu {
    display: none;
    max-height: 0; overflow: hidden;
    background: rgba(6, 13, 26, 0.92);
    backdrop-filter: blur(24px);
    transition: max-height 0.4s ease;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }
  .mobile-menu.open { max-height: 480px; }
  .mobile-menu a {
    display: block; padding: 14px 24px; color: var(--text-body);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    font-size: 1rem;
  }
  .mobile-menu a:last-child { border-bottom: none; }
  .mobile-menu a.active { color: var(--accent-primary); background: rgba(34, 216, 207, 0.05); }
  .mobile-menu .btn-primary { margin: 16px 24px; width: calc(100% - 48px); }

  /* Section spacing */
  .section { padding: 80px 0; position: relative; }
  @media (min-width: 768px) { .section { padding: 112px 0; } }
  .section-label {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.8rem; letter-spacing: 0.12em;
    color: var(--accent-primary); text-transform: uppercase;
    margin-bottom: 12px; font-weight: 600;
  }
  .section-label::before {
    content: ''; width: 20px; height: 2px;
    background: var(--accent-primary); border-radius: 2px;
  }
  .section-title {
    font-size: 1.8rem; font-weight: 700; color: var(--text-heading);
    line-height: 1.3; letter-spacing: -0.01em;
  }
  @media (min-width: 768px) { .section-title { font-size: 2.2rem; } }

  /* Hero */
  .hero {
    min-height: 88vh;
    display: flex; align-items: center;
    padding-top: var(--header-h);
    background:
      linear-gradient(rgba(34, 216, 207, 0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(34, 216, 207, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    position: relative;
    overflow: hidden;
  }
  .hero::before {
    content: '';
    position: absolute; top: -80px; right: -100px;
    width: 480px; height: 480px; border-radius: 50%;
    background: radial-gradient(circle, rgba(34, 216, 207, 0.15), transparent 70%);
    pointer-events: none;
  }
  .hero::after {
    content: '';
    position: absolute; bottom: -60px; left: -80px;
    width: 400px; height: 400px; border-radius: 50%;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.1), transparent 70%);
    pointer-events: none;
  }
  .hero-grid {
    display: grid; grid-template-columns: 1fr;
    gap: 40px; align-items: center;
    position: relative; z-index: 2;
    width: 100%;
  }
  @media (min-width: 1024px) { .hero-grid { grid-template-columns: 1.1fr 0.9fr; gap: 60px; } }
  .hero-title {
    font-size: 1.9rem; font-weight: 900; color: var(--text-heading);
    line-height: 1.25; letter-spacing: -0.02em;
    margin-bottom: 16px;
  }
  @media (min-width: 768px) { .hero-title { font-size: 2.6rem; } }
  @media (min-width: 1024px) { .hero-title { font-size: 3rem; } }
  .hero-subtitle {
    font-size: 1.05rem; color: var(--text-muted);
    margin-bottom: 28px; max-width: 480px; line-height: 1.7;
  }
  .hero-cta {
    display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 32px;
  }
  .hero-badges {
    display: flex; flex-wrap: wrap; gap: 20px;
  }
  .hero-badge {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.85rem; color: var(--text-muted);
  }
  .hero-badge i {
    color: var(--accent-primary);
    font-style: normal; font-size: 0.7rem;
  }
  .hero-visual {
    position: relative;
  }
  .hero-visual-card {
    border-radius: 24px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
    min-height: 320px;
    background-image: url('/assets/images/backpic/back-1.webp');
    background-size: cover;
    background-position: center;
    position: relative;
  }
  .hero-visual-card::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(6,13,26,0) 30%, rgba(6,13,26,0.5) 100%);
    pointer-events: none;
  }
  .hero-visual-tag {
    position: absolute; bottom: 16px; left: 16px;
    padding: 6px 14px; border-radius: 9999px;
    background: rgba(6, 13, 26, 0.7);
    backdrop-filter: blur(10px);
    color: var(--accent-primary); font-size: 0.8rem;
    border: 1px solid rgba(34, 216, 207, 0.3);
    z-index: 2;
    display: flex; align-items: center; gap: 6px;
  }

  /* Trust bar */
  .trust-bar {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    padding: 24px 0;
  }
  .trust-grid {
    display: grid; grid-template-columns: 1fr;
    gap: 20px;
    text-align: center;
  }
  @media (min-width: 768px) { .trust-grid { grid-template-columns: repeat(3, 1fr); } }
  .trust-item {
    display: flex; align-items: center; justify-content: center;
    gap: 12px; color: var(--text-body); font-size: 0.95rem;
  }
  .trust-item-icon {
    width: 36px; height: 36px; border-radius: 12px;
    background: rgba(34, 216, 207, 0.1);
    border: 1px solid rgba(34, 216, 207, 0.2);
    display: flex; align-items: center; justify-content: center;
    color: var(--accent-primary); font-size: 1rem;
    flex-shrink: 0;
  }

  /* Steps */
  .steps-grid {
    display: grid; grid-template-columns: 1fr;
    gap: 32px; margin-top: 48px;
    position: relative;
  }
  @media (min-width: 768px) { .steps-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; } }
  .step-item {
    position: relative;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-card);
    padding: 32px 28px;
    transition: all 0.3s;
  }
  .step-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(34, 216, 207, 0.3);
    box-shadow: var(--glow-card);
  }
  .step-num {
    font-size: 2.2rem; font-weight: 900; color: var(--accent-primary);
    opacity: 0.7; line-height: 1;
    margin-bottom: 16px;
    font-variant-numeric: tabular-nums;
  }
  .step-title {
    font-size: 1.15rem; font-weight: 600; color: var(--text-heading);
    margin-bottom: 10px;
  }
  .step-desc {
    font-size: 0.92rem; color: var(--text-muted); line-height: 1.7;
  }
  .step-connector {
    position: absolute; top: 50%; right: -24px;
    width: 24px; height: 1px;
    background: linear-gradient(90deg, var(--accent-primary), transparent);
    display: none;
  }
  @media (min-width: 768px) {
    .step-item:not(:last-child) .step-connector { display: block; }
  }

  /* Cases */
  .case-list {
    display: grid; grid-template-columns: 1fr;
    gap: 40px; margin-top: 48px;
  }
  @media (min-width: 1024px) { .case-list { grid-template-columns: 1fr 1fr; gap: 56px; } }
  .case-card {
    display: grid; grid-template-columns: 1fr;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    overflow: hidden;
    transition: all 0.3s;
  }
  .case-card:hover {
    border-color: rgba(34, 216, 207, 0.25);
    box-shadow: var(--glow-card);
  }
  @media (min-width: 768px) {
    .case-card { grid-template-columns: 1fr 1fr; }
    .case-card.flip .case-img { order: 2; }
    .case-card.flip .case-body { order: 1; }
  }
  .case-img {
    background-size: cover; background-position: center;
    min-height: 220px;
    position: relative;
  }
  .case-body {
    padding: 28px; display: flex; flex-direction: column; justify-content: center;
  }
  .case-metric {
    font-size: 1.6rem; font-weight: 800; color: var(--accent-primary);
    font-variant-numeric: tabular-nums; margin-bottom: 8px;
  }
  .case-title {
    font-size: 1.05rem; font-weight: 600; color: var(--text-heading);
    margin-bottom: 12px; line-height: 1.5;
  }
  .case-desc {
    font-size: 0.9rem; color: var(--text-muted); line-height: 1.7;
  }

  /* News */
  .news-section {
    background: var(--bg-secondary);
  }
  .news-list {
    margin-top: 40px; display: flex; flex-direction: column; gap: 16px;
  }
  .news-item {
    display: grid; grid-template-columns: 80px 1fr;
    gap: 16px; padding: 20px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.25s;
  }
  @media (min-width: 768px) {
    .news-item { grid-template-columns: 120px 1fr; padding: 24px; }
  }
  .news-item:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(34, 216, 207, 0.25);
  }
  .news-item:hover .news-title { color: var(--accent-primary); }
  .news-img {
    border-radius: 12px; overflow: hidden;
    background-size: cover; background-position: center;
    min-height: 80px;
    position: relative;
    background-color: var(--bg-secondary);
  }
  @media (min-width: 768px) { .news-img { min-height: 96px; } }
  .news-img img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
  .news-info { display: flex; flex-direction: column; justify-content: center; min-width: 0; }
  .news-meta {
    display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
    font-size: 0.8rem; color: var(--text-dim); margin-bottom: 6px;
  }
  .news-tag {
    background: rgba(34, 216, 207, 0.1);
    color: var(--accent-primary);
    border-radius: 9999px; padding: 2px 10px; font-size: 0.75rem;
    border: 1px solid rgba(34, 216, 207, 0.2);
  }
  .news-title {
    font-size: 1rem; font-weight: 600; color: var(--text-heading);
    transition: color 0.2s; line-height: 1.4;
  }
  @media (min-width: 768px) { .news-title { font-size: 1.1rem; } }
  .news-desc {
    font-size: 0.85rem; color: var(--text-muted);
    margin-top: 4px; line-height: 1.5;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .news-empty {
    text-align: center; padding: 60px 20px; color: var(--text-dim);
    font-size: 0.95rem;
  }

  /* FAQ */
  .faq-wrap {
    display: grid; grid-template-columns: 1fr;
    gap: 40px; margin-top: 48px;
  }
  @media (min-width: 1024px) { .faq-wrap { grid-template-columns: 0.8fr 1.2fr; gap: 60px; } }
  .faq-left { display: flex; flex-direction: column; justify-content: center; }
  .faq-cta {
    margin-top: 24px;
  }
  .faq-list {
    display: flex; flex-direction: column; gap: 12px;
  }
  .faq-item {
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    overflow: hidden;
    transition: all 0.3s;
  }
  .faq-item.active {
    border-color: rgba(34, 216, 207, 0.3);
  }
  .faq-question {
    width: 100%; text-align: left;
    background: none; border: none;
    padding: 20px 24px;
    display: flex; align-items: center; justify-content: space-between;
    cursor: pointer; color: var(--text-heading);
    font-size: 0.98rem; font-weight: 600;
  }
  .faq-icon {
    width: 24px; height: 24px; border-radius: 50%;
    background: rgba(34, 216, 207, 0.1);
    color: var(--accent-primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; flex-shrink: 0;
    transition: transform 0.3s;
  }
  .faq-item.active .faq-icon {
    transform: rotate(45deg);
    background: rgba(34, 216, 207, 0.2);
  }
  .faq-answer {
    max-height: 0; overflow: hidden;
    transition: max-height 0.35s ease, padding 0.3s;
    padding: 0 24px;
    color: var(--text-muted); font-size: 0.9rem; line-height: 1.7;
  }
  .faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 24px 20px;
  }

  /* CTA */
  .cta-section {
    background:
      linear-gradient(rgba(34, 216, 207, 0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(34, 216, 207, 0.04) 1px, transparent 1px),
      var(--bg-secondary);
    background-size: 50px 50px;
  }
  .cta-panel {
    border-radius: 28px;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px 32px;
    display: grid; grid-template-columns: 1fr;
    gap: 32px;
  }
  @media (min-width: 1024px) {
    .cta-panel { grid-template-columns: 1fr 1fr; gap: 60px; padding: 56px; }
  }
  .cta-title { font-size: 1.5rem; font-weight: 700; color: var(--text-heading); line-height: 1.3; }
  @media (min-width: 768px) { .cta-title { font-size: 1.8rem; } }
  .cta-form { display: flex; flex-direction: column; gap: 16px; }
  .form-input {
    width: 100%;
    padding: 14px 18px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-heading);
    outline: none;
    transition: all 0.25s;
  }
  .form-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(34, 216, 207, 0.15);
    background: rgba(255, 255, 255, 0.07);
  }
  .form-input::placeholder { color: var(--text-dim); }
  textarea.form-input { resize: vertical; min-height: 100px; }
  .form-privacy {
    font-size: 0.75rem; color: var(--text-dim); line-height: 1.5;
  }

  /* Footer */
  .site-footer {
    background: #050A14;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 60px 0 0;
  }
  .footer-grid {
    display: grid; grid-template-columns: 1fr;
    gap: 40px; padding-bottom: 40px;
  }
  @media (min-width: 768px) {
    .footer-grid { grid-template-columns: 1.2fr 0.8fr 0.8fr 1fr; gap: 32px; }
  }
  .footer-brand .logo-link { margin-bottom: 16px; }
  .footer-desc { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; max-width: 280px; }
  .footer-col-title {
    font-size: 0.95rem; font-weight: 600; color: var(--text-heading);
    margin-bottom: 16px;
  }
  .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
  .footer-col a {
    font-size: 0.88rem; color: var(--text-muted);
    transition: color 0.2s;
  }
  .footer-col a:hover { color: var(--accent-primary); }
  .footer-contact { display: flex; flex-direction: column; gap: 10px; }
  .footer-contact span { font-size: 0.88rem; color: var(--text-muted); }
  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding: 20px 0;
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    text-align: center;
  }
  .footer-bottom p { font-size: 0.82rem; color: var(--text-dim); }

  /* Reveal animation */
  .reveal {
    opacity: 0; transform: translateY(30px);
    transition: opacity 0.6s, transform 0.6s;
  }
  .reveal.visible {
    opacity: 1; transform: translateY(0);
  }

  /* Responsive */
  @media (max-width: 1024px) {
    .main-nav { display: none; }
    .nav-cta-desktop { display: none; }
    .hamburger { display: flex; }
    .mobile-menu { display: block; }
  }
  @media (min-width: 1025px) {
    .mobile-menu { display: none !important; }
  }
  @media (max-width: 640px) {
    .hero-title { font-size: 1.6rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .section { padding: 60px 0; }
    .section-title { font-size: 1.5rem; }
    .cta-panel { padding: 32px 20px; }
    .header-inner { height: 64px; }
    .logo-link { font-size: 1rem; }
  }
  a:focus-visible, button:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: 4px;
  }
  .visually-hidden {
    position: absolute; width: 1px; height: 1px;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
  }

/* roulang page: category1 */
/* ===== Design Tokens ===== */
        :root {
            --bg-dark: #060D1A;
            --bg-layer: #0C1B30;
            --primary: #1E4A6F;
            --accent: #22D8CF;
            --accent-light: #38BDF8;
            --text-body: #E2E8F0;
            --text-title: #F8FAFC;
            --text-muted: #64748B;
            --text-silver: #8CA3B8;
            --border-white: rgba(255, 255, 255, 0.1);
            --border-hover: rgba(255, 255, 255, 0.2);
            --glass-bg: rgba(255, 255, 255, 0.04);
            --glass-hover: rgba(255, 255, 255, 0.08);
            --shadow-card: 0 0 40px -12px rgba(34, 216, 207, 0.35);
            --shadow-btn: 0 0 30px -6px rgba(34, 216, 207, 0.5);
            --radius-xl: 24px;
            --radius-lg: 16px;
            --radius-md: 12px;
        }

        /* ===== Base Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg-dark);
            color: var(--text-body);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        button {
            font-family: inherit;
            cursor: pointer;
        }
        input,
        textarea {
            font-family: inherit;
        }

        /* ===== Container ===== */
        .container {
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 80px;
            background: rgba(6, 13, 26, 0.7);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo-link {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--text-title);
            letter-spacing: -0.02em;
        }
        .logo-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            box-shadow: 0 0 12px rgba(34, 216, 207, 0.8);
            flex-shrink: 0;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 2rem;
        }
        .main-nav a {
            position: relative;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-silver);
            padding: 6px 2px;
            transition: color 0.2s ease;
        }
        .main-nav a:hover {
            color: var(--text-title);
        }
        .main-nav a.active {
            color: var(--accent);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), transparent);
            border-radius: 2px;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            padding: 8px;
        }
        .hamburger span {
            display: block;
            height: 2px;
            background: var(--text-title);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 80px;
            left: 0;
            right: 0;
            background: rgba(6, 13, 26, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            padding: 1rem 1.25rem 1.5rem;
            flex-direction: column;
            gap: 0.25rem;
            z-index: 99;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .mobile-menu.open {
            max-height: 420px;
        }
        .mobile-menu a {
            display: block;
            padding: 0.8rem 0.5rem;
            font-size: 1rem;
            color: var(--text-body);
            border-radius: 10px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
        }
        .mobile-menu a.active {
            color: var(--accent);
        }
        .mobile-menu a:last-child {
            border-bottom: none;
        }

        /* ===== Buttons ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            color: #04121A;
            font-weight: 700;
            font-size: 0.925rem;
            padding: 10px 24px;
            border-radius: 9999px;
            border: none;
            box-shadow: var(--shadow-btn);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 40px -4px rgba(34, 216, 207, 0.65);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 0 20px -6px rgba(34, 216, 207, 0.4);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--text-title);
            font-weight: 600;
            font-size: 0.925rem;
            padding: 10px 24px;
            border-radius: 9999px;
            border: 1px solid rgba(255, 255, 255, 0.25);
            transition: all 0.2s ease;
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--accent);
            color: var(--accent);
        }
        .btn-lg {
            padding: 14px 36px;
            font-size: 1rem;
        }
        .nav-cta-desktop {
            font-size: 0.85rem;
            padding: 8px 20px;
        }

        /* ===== Glass Card ===== */
        .glass-card {
            background: rgba(255, 255, 255, 0.04);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-white);
            border-radius: 16px;
            transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
        }
        .glass-card:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--border-hover);
        }

        /* ===== Section spacing ===== */
        .section {
            padding: 5rem 0;
        }
        @media (min-width: 768px) {
            .section {
                padding: 7rem 0;
            }
        }

        /* ===== Page Hero (Small) ===== */
        .page-hero {
            padding-top: 160px;
            padding-bottom: 64px;
            background:
                radial-gradient(900px 400px at 80% 0%, rgba(34, 216, 207, 0.08), transparent 60%),
                radial-gradient(700px 350px at 10% 100%, rgba(56, 189, 248, 0.05), transparent 55%),
                linear-gradient(160deg, #060D1A 0%, #0C1B30 100%);
            position: relative;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 44px 44px;
            pointer-events: none;
        }
        .page-hero>* {
            position: relative;
            z-index: 1;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 28px;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.2);
        }
        .breadcrumb .current {
            color: var(--text-silver);
        }

        /* ===== Section Tag ===== */
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--text-silver);
            margin-bottom: 14px;
        }
        .section-tag .tag-line {
            width: 24px;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), transparent);
            border-radius: 2px;
        }

        /* ===== Timeline ===== */
        .timeline {
            position: relative;
            padding-left: 48px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 19px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: linear-gradient(to bottom, rgba(34, 216, 207, 0.6), rgba(255, 255, 255, 0.04));
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            padding-bottom: 40px;
        }
        .timeline-item:last-child {
            padding-bottom: 0;
        }
        .timeline-dot {
            position: absolute;
            left: -44px;
            top: 0;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: #0C1B30;
            border: 2px solid var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
            font-weight: 800;
            color: var(--accent);
            box-shadow: 0 0 18px rgba(34, 216, 207, 0.25);
            z-index: 1;
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-white);
            border-radius: 16px;
            margin-bottom: 14px;
            overflow: hidden;
            transition: border-color 0.25s ease, background 0.25s ease;
        }
        .faq-item.open {
            border-color: rgba(34, 216, 207, 0.35);
            background: rgba(255, 255, 255, 0.06);
        }
        .faq-toggle {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 20px;
            background: transparent;
            border: none;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-title);
            gap: 16px;
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            font-weight: 400;
            color: var(--accent);
            transition: all 0.25s ease;
        }
        .faq-item.open .faq-icon {
            border-color: var(--accent);
            background: rgba(34, 216, 207, 0.12);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        .faq-answer-inner {
            padding: 0 20px 20px;
            color: var(--text-silver);
            line-height: 1.8;
            font-size: 0.925rem;
        }

        /* ===== Image Holder ===== */
        .img-holder {
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #1E4A6F, #0C1B30);
        }
        .img-holder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .img-holder:hover img {
            transform: scale(1.03);
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background:
                radial-gradient(600px 300px at 50% 100%, rgba(34, 216, 207, 0.1), transparent 70%),
                linear-gradient(180deg, #060D1A, #0C1B30);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #040A14;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 4rem 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2.5rem;
            padding-bottom: 3rem;
        }
        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            }
        }
        .footer-brand .logo-link {
            margin-bottom: 14px;
        }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
            margin-top: 12px;
            max-width: 320px;
        }
        .footer-col-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-title);
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul a {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: color 0.2s ease;
        }
        .footer-col ul a:hover {
            color: var(--accent);
        }
        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 8px;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 1.5rem 0;
            display: flex;
            flex-direction: column;
            gap: 6px;
            justify-content: space-between;
            align-items: center;
            color: var(--text-muted);
            font-size: 0.82rem;
        }
        @media (min-width: 768px) {
            .footer-bottom {
                flex-direction: row;
            }
        }

        /* ===== Responsive ===== */
        @media (max-width: 1023px) {
            .main-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .nav-cta-desktop {
                display: none;
            }
            .mobile-menu {
                display: flex;
            }
        }
        @media (max-width: 640px) {
            .site-header {
                height: 64px;
            }
            .mobile-menu {
                top: 64px;
            }
            .page-hero {
                padding-top: 120px;
                padding-bottom: 48px;
            }
            .section {
                padding: 3.5rem 0;
            }
        }

        /* focus visible accessibility */
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

/* roulang page: article */
:root {
  --bg-deep: #060D1A;
  --bg-navy: #0C1B30;
  --c-primary: #22D8CF;
  --c-primary-2: #38BDF8;
  --c-accent: #1E4A6F;
  --c-text: #E2E8F0;
  --c-title: #F8FAFC;
  --c-muted: #64748B;
  --c-silver: #8CA3B8;
  --border-white-5: rgba(255,255,255,0.05);
  --border-white-10: rgba(255,255,255,0.10);
  --border-white-20: rgba(255,255,255,0.20);
  --radius-xs: 8px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --shadow-glow: 0 0 40px -12px rgba(34,216,207,0.35);
  --shadow-glow-strong: 0 0 30px -6px rgba(34,216,207,0.5);
  --font-sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--c-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}

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

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

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

input,
textarea {
  font-family: inherit;
}

h1, h2, h3, h4 {
  color: var(--c-title);
  line-height: 1.3;
}

h1 {
  font-weight: 900;
  letter-spacing: -0.02em;
}

h2 {
  font-weight: 700;
}

h3 {
  font-weight: 600;
}

main {
  position: relative;
  z-index: 1;
}

.container {
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.section-head {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-primary);
  background: rgba(34,216,207,0.1);
  border: 1px solid rgba(34,216,207,0.25);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--c-title);
  position: relative;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 1.2em;
  background: linear-gradient(180deg, var(--c-primary), var(--c-primary-2));
  border-radius: 2px;
  margin-right: 0.6rem;
  vertical-align: -0.2em;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #22D8CF, #38BDF8);
  color: #04121A;
  font-weight: 700;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-glow-strong);
  transition: transform 0.2s, box-shadow 0.2s;
  border: none;
  font-size: 0.95rem;
  line-height: 1.2;
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px -4px rgba(34,216,207,0.65);
  color: #04121A;
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 3px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: #fff;
  border: 1px solid var(--border-white-20);
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  font-size: 0.95rem;
  white-space: nowrap;
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--c-primary);
  color: var(--c-primary);
  transform: translateY(-2px);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(6,13,26,0.7);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-white-5);
  height: 5rem;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--c-title);
}

.logo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-primary);
  box-shadow: 0 0 12px rgba(34,216,207,0.8);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.main-nav a {
  position: relative;
  padding: 0.5rem 1rem;
  color: var(--c-silver);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: color 0.25s, background 0.25s;
}

.main-nav a:hover {
  color: var(--c-title);
  background: rgba(255,255,255,0.05);
}

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

.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 1.1rem;
  right: 1.1rem;
  bottom: 0.15rem;
  height: 2px;
  border-radius: 2px;
  background: var(--c-primary);
  box-shadow: 0 0 8px rgba(34,216,207,0.7);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-cta-desktop {
  padding: 0.6rem 1.5rem;
  font-size: 0.9rem;
}

.hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border-white-10);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-title);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

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

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

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

.mobile-menu {
  display: none;
  position: fixed;
  top: 5rem;
  left: 0;
  right: 0;
  background: rgba(6,13,26,0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-white-10);
  padding: 1rem 1.25rem 1.5rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  z-index: 99;
}

.mobile-menu.open {
  max-height: 90vh;
  overflow-y: auto;
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 0.85rem 0.5rem;
  color: var(--c-text);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--border-white-5);
}

.mobile-menu a.active {
  color: var(--c-primary);
}

.mobile-menu a:last-child {
  border-bottom: none;
  margin-top: 0.75rem;
}

.article-banner {
  position: relative;
  padding: 9rem 0 4rem;
  background-color: var(--bg-navy);
  background-image: linear-gradient(rgba(6,13,26,0.88), rgba(6,13,26,0.95)), url('/assets/images/backpic/back-1.webp');
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid var(--border-white-10);
  overflow: hidden;
}

.article-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--c-silver);
  margin-bottom: 1.5rem;
}

.article-breadcrumb a {
  color: var(--c-silver);
}

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

.article-breadcrumb .sep {
  color: var(--c-muted);
}

.article-breadcrumb .current {
  color: var(--c-primary);
  max-width: 420px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.banner-title {
  font-size: 2.6rem;
  color: var(--c-title);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  max-width: 48rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  color: var(--c-silver);
  font-size: 0.85rem;
  margin-top: 1.25rem;
}

.meta-badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(34,216,207,0.18), rgba(56,189,248,0.12));
  color: var(--c-primary);
  border: 1px solid rgba(34,216,207,0.3);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.article-main {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.article-shell {
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-white-10);
  border-radius: var(--radius-lg);
  padding: 2.5rem 3rem;
  box-shadow: 0 20px 60px -30px rgba(0,0,0,0.6);
}

.article-body {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--c-text);
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  padding-left: 0.85rem;
  border-left: 3px solid var(--c-primary);
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}

.article-body ul {
  margin: 1rem 0 1.5rem;
  padding-left: 0;
  list-style: none;
}

.article-body ul li {
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1.5rem;
}

.article-body ul li::before {
  content: '';
  position: absolute;
  left: 0.1rem;
  top: 0.75em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-primary);
  box-shadow: 0 0 8px rgba(34,216,207,0.6);
}

.article-body ol {
  margin: 1rem 0 1.5rem;
  padding-left: 1.5rem;
  list-style-position: outside;
}

.article-body ol li {
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  border-left: 3px solid var(--c-primary);
  background: rgba(34,216,207,0.06);
  padding: 1rem 1.5rem;
  border-radius: 0 12px 12px 0;
  color: var(--c-silver);
  margin: 1.5rem 0;
  font-style: normal;
}

.article-body img {
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
  width: 100%;
  background: linear-gradient(135deg, rgba(34,216,207,0.12), rgba(56,189,248,0.06)), var(--bg-navy);
}

.article-body a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-body a:hover {
  text-decoration: none;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.article-body th,
.article-body td {
  border: 1px solid var(--border-white-10);
  padding: 0.75rem 1rem;
  text-align: left;
}

.article-body th {
  background: rgba(255,255,255,0.05);
  font-weight: 600;
  color: var(--c-title);
}

.article-body code {
  background: rgba(255,255,255,0.08);
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  font-size: 0.9em;
}

.article-prev-next {
  max-width: 840px;
  margin: 2rem auto 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.pn-link {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-white-10);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
}

.pn-link:hover {
  border-color: rgba(34,216,207,0.4);
  background: rgba(255,255,255,0.07);
  transform: translateY(-2px);
}

.pn-link.pn-next {
  text-align: right;
}

.pn-label {
  font-size: 0.75rem;
  color: var(--c-muted);
  letter-spacing: 0.05em;
}

.pn-title {
  font-size: 0.95rem;
  color: var(--c-title);
  font-weight: 600;
}

.not-found {
  text-align: center;
  padding: 2rem 0;
}

.not-found h1 {
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}

.not-found p {
  color: var(--c-silver);
  margin-bottom: 1.5rem;
}

.related-section {
  padding-top: 4rem;
  padding-bottom: 5rem;
  border-top: 1px solid var(--border-white-5);
  background: linear-gradient(180deg, rgba(12,27,48,0.6), transparent);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.related-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-white-10);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-white-20);
  box-shadow: var(--shadow-glow);
}

.related-card-thumb {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(34,216,207,0.12), rgba(56,189,248,0.06)), var(--bg-navy);
}

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

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

.related-card-body {
  padding: 1.25rem 1.5rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-title);
  line-height: 1.4;
}

.related-card-title a:hover {
  color: var(--c-primary);
}

.related-card-desc {
  font-size: 0.85rem;
  color: var(--c-silver);
  line-height: 1.6;
}

.related-card-link {
  margin-top: auto;
  padding-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--c-primary);
  font-weight: 600;
}

.cta-section {
  position: relative;
  padding: 5rem 0;
  border-top: 1px solid var(--border-white-5);
  background-color: var(--bg-navy);
  background-image: radial-gradient(ellipse at top, rgba(34,216,207,0.12), transparent 60%);
}

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

.cta-form {
  margin-top: 2rem;
  text-align: left;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-white-10);
  border-radius: var(--radius-lg);
  padding: 2rem;
  backdrop-filter: blur(20px);
}

.cta-form .form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.cta-form .form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.cta-form label {
  font-size: 0.85rem;
  color: var(--c-silver);
  font-weight: 500;
}

.cta-form input,
.cta-form textarea {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-white-10);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  color: var(--c-title);
  font-size: 0.95rem;
  transition: border-color 0.25s, box-shadow 0.25s;
  outline: none;
}

.cta-form input:focus,
.cta-form textarea:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 4px rgba(34,216,207,0.15);
}

.cta-form textarea {
  resize: vertical;
  min-height: 100px;
}

.privacy-note {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--c-muted);
  text-align: center;
}

.form-status {
  display: none;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  background: rgba(34,216,207,0.1);
  border: 1px solid rgba(34,216,207,0.3);
  color: var(--c-primary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  text-align: center;
}

.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border-white-5);
  padding-top: 4rem;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 2rem;
  padding-bottom: 3rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--c-silver);
  max-width: 20rem;
  line-height: 1.7;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-title);
  margin-bottom: 0.5rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-col ul a {
  color: var(--c-silver);
  font-size: 0.9rem;
  transition: color 0.25s;
}

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

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  color: var(--c-silver);
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid var(--border-white-5);
  padding: 1.5rem 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--c-muted);
}

@media (max-width: 1024px) {
  .main-nav {
    display: none;
  }

  .nav-cta-desktop {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .site-header {
    height: 4rem;
  }

  .mobile-menu {
    top: 4rem;
  }

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

  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 768px) {
  .article-shell {
    padding: 2rem 1.5rem;
  }

  .banner-title {
    font-size: 2rem;
  }
}

@media (max-width: 640px) {
  h1 {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1.3rem;
  }

  .article-banner {
    padding: 7rem 0 3rem;
  }

  .banner-title {
    font-size: 1.6rem;
  }

  .article-shell {
    padding: 1.5rem 1.25rem;
  }

  .article-prev-next {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .cta-form .form-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.35rem;
    text-align: center;
  }
}

@media (min-width: 1025px) {
  .mobile-menu.open {
    display: none;
  }
}

/* roulang page: category2 */
:root {
    --bg-dark: #060D1A;
    --bg-deep: #0C1B30;
    --primary: #1E4A6F;
    --accent: #22D8CF;
    --accent-2: #38BDF8;
    --silver: #8CA3B8;
    --text-body: #E2E8F0;
    --text-title: #F8FAFC;
    --text-muted: #64748B;
    --border-light: rgba(255, 255, 255, 0.1);
    --radius-lg: 1.5rem;
    --radius-md: 1rem;
    --radius-sm: 0.75rem;
    --shadow-glow: 0 0 40px -12px rgba(34, 216, 207, 0.35);
    --shadow-glow-strong: 0 0 30px -6px rgba(34, 216, 207, 0.5);
    --transition: all 0.3s ease;
  }

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

  html {
    scroll-behavior: smooth;
  }

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

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

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

  button,
  input,
  textarea {
    font-family: inherit;
    font-size: inherit;
  }

  .container {
    max-width: 80rem;
    margin: 0 auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  @media (min-width: 768px) {
    .container {
      padding-left: 2rem;
      padding-right: 2rem;
    }
  }

  /* ===== 导航 ===== */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: rgba(6, 13, 26, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    height: 4.5rem;
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
  }

  .logo-link {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
    font-weight: 800;
    color: var(--text-title);
    letter-spacing: -0.02em;
    font-size: 1.15rem;
  }

  .logo-dot {
    width: 10px;
    height: 10px;
    border-radius: 9999px;
    background: var(--accent);
    box-shadow: 0 0 16px rgba(34, 216, 207, 0.8);
    display: inline-block;
  }

  .main-nav {
    display: none;
    align-items: center;
    gap: 2rem;
  }

  .main-nav a {
    position: relative;
    color: var(--silver);
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.2;
    padding: 0.3rem 0;
  }

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

  .main-nav a.active {
    color: var(--accent);
  }

  .main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -0.45rem;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    box-shadow: 0 0 12px rgba(34, 216, 207, 0.6);
  }

  .nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .nav-cta-desktop {
    display: none;
  }

  .hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: 0.5rem;
    padding: 10px;
  }

  .hamburger span {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--text-body);
    border-radius: 2px;
    transition: var(--transition);
  }

  .hamburger:hover span {
    background: var(--accent);
  }

  .mobile-menu {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    background: rgba(6, 13, 26, 0.95);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: 1.25rem 1.5rem 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.35s ease, opacity 0.25s ease, visibility 0.25s ease;
  }

  .mobile-menu.open {
    max-height: 480px;
    opacity: 1;
    visibility: visible;
  }

  .mobile-menu a {
    display: block;
    padding: 0.75rem 0.5rem;
    color: var(--silver);
    font-size: 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
  }

  .mobile-menu a:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-title);
  }

  .mobile-menu a.active {
    color: var(--accent);
  }

  .mobile-menu a.btn-primary {
    margin-top: 0.75rem;
    text-align: center;
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, #22D8CF, #38BDF8);
    color: #04121A;
    font-weight: 700;
    border-radius: 9999px;
    box-shadow: 0 0 30px -6px rgba(34, 216, 207, 0.5);
  }

  @media (min-width: 1024px) {
    .site-header {
      height: 5rem;
    }

    .header-inner {
      height: 5rem;
    }

    .main-nav {
      display: flex;
    }

    .nav-cta-desktop {
      display: inline-flex;
    }

    .hamburger {
      display: none;
    }
  }

  /* ===== 按钮 ===== */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #22D8CF, #38BDF8);
    color: #04121A;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.8rem 1.6rem;
    border: none;
    border-radius: 9999px;
    box-shadow: 0 0 30px -6px rgba(34, 216, 207, 0.5);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 42px -6px rgba(34, 216, 207, 0.65);
  }

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

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

  .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: transparent;
    color: var(--text-title);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.8rem 1.6rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 9999px;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
  }

  .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
  }

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

  /* ===== 小 Hero ===== */
  .page-hero {
    position: relative;
    padding: 9rem 0 4.5rem;
    background: linear-gradient(135deg, rgba(6, 13, 26, 0.92), rgba(12, 27, 48, 0.82)), url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    overflow: hidden;
  }

  .page-hero::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -120px;
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(34, 216, 207, 0.12), transparent 70%);
    pointer-events: none;
  }

  .page-hero::after {
    content: '';
    position: absolute;
    bottom: -160px;
    left: -100px;
    width: 380px;
    height: 380px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.1), transparent 70%);
    pointer-events: none;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--accent);
    background: rgba(34, 216, 207, 0.1);
    border: 1px solid rgba(34, 216, 207, 0.25);
    padding: 0.35rem 0.9rem;
    border-radius: 9999px;
    letter-spacing: 0.04em;
    margin-bottom: 1.25rem;
  }

  .page-hero h1 {
    font-size: 2.25rem;
    line-height: 1.2;
    font-weight: 900;
    color: var(--text-title);
    letter-spacing: -0.03em;
    max-width: 760px;
  }

  .page-hero .hero-desc {
    margin-top: 1rem;
    color: var(--silver);
    font-size: 1.05rem;
    max-width: 640px;
    line-height: 1.8;
  }

  .hero-actions {
    margin-top: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }

  @media (min-width: 768px) {
    .page-hero {
      padding: 10rem 0 5rem;
    }

    .page-hero h1 {
      font-size: 3rem;
    }
  }

  /* ===== 区块通用 ===== */
  .page-section {
    padding: 4.5rem 0;
  }

  @media (min-width: 768px) {
    .page-section {
      padding: 6.5rem 0;
    }
  }

  .section-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
  }

  .section-label::before {
    content: '';
    width: 18px;
    height: 1px;
    background: var(--accent);
    display: inline-block;
  }

  .section-title-wrapper {
    margin-bottom: 2.5rem;
  }

  .section-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-title);
    letter-spacing: -0.02em;
    line-height: 1.25;
  }

  @media (min-width: 768px) {
    .section-title {
      font-size: 2.25rem;
    }
  }

  .section-sub {
    color: var(--silver);
    margin-top: 0.6rem;
    max-width: 560px;
    font-size: 0.95rem;
  }

  /* ===== 图文交替 ===== */
  .split-grid {
    display: flex;
    flex-direction: column;
    gap: 4.5rem;
  }

  .split-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
  }

  .split-media {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 80px -30px rgba(0, 0, 0, 0.8);
    transition: var(--transition);
  }

  .split-media:hover {
    box-shadow: var(--shadow-glow);
    border-color: rgba(255, 255, 255, 0.18);
  }

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

  .split-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .split-step {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: rgba(34, 216, 207, 0.08);
    border: 1px solid rgba(34, 216, 207, 0.2);
    padding: 0.3rem 0.8rem;
    border-radius: 9999px;
    margin-bottom: 1rem;
  }

  .split-content h2 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-title);
    letter-spacing: -0.02em;
    line-height: 1.3;
    margin-bottom: 0.8rem;
  }

  @media (min-width: 768px) {
    .split-content h2 {
      font-size: 1.8rem;
    }
  }

  .split-content p {
    color: var(--silver);
    font-size: 0.98rem;
    line-height: 1.85;
    margin-bottom: 1.25rem;
  }

  .check-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
  }

  .check-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.92rem;
    color: var(--text-body);
    line-height: 1.6;
  }

  .check-list li::before {
    content: '✓';
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border-radius: 9999px;
    background: rgba(34, 216, 207, 0.15);
    color: var(--accent);
    font-size: 0.7rem;
    font-weight: 700;
    margin-top: 2px;
  }

  @media (min-width: 1024px) {
    .split-row {
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
    }

    .split-flip .split-media {
      order: 2;
    }

    .split-flip .split-content {
      order: 1;
    }
  }

  /* ===== 横向滚动卡带 ===== */
  .scroll-wrap {
    background: var(--bg-deep);
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  .scroll-track {
    display: flex;
    flex-wrap: nowrap;
    gap: 1rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 1rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(34, 216, 207, 0.4) rgba(255, 255, 255, 0.05);
    margin-top: 2rem;
  }

  .scroll-track::-webkit-scrollbar {
    height: 6px;
  }

  .scroll-track::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.04);
    border-radius: 4px;
  }

  .scroll-track::-webkit-scrollbar-thumb {
    background: rgba(34, 216, 207, 0.35);
    border-radius: 4px;
  }

  .feature-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1.25rem;
    padding: 1.5rem 1.4rem;
    transition: var(--transition);
    min-height: 180px;
    display: flex;
    flex-direction: column;
  }

  .feature-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
  }

  .feature-num {
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: 0.08em;
    margin-bottom: 0.8rem;
    font-variant-numeric: tabular-nums;
  }

  .feature-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 0.5rem;
    line-height: 1.4;
  }

  .feature-card p {
    font-size: 0.88rem;
    color: var(--silver);
    line-height: 1.65;
  }

  @media (min-width: 640px) {
    .feature-card {
      flex-basis: 300px;
    }
  }

  /* ===== CTA 面板 ===== */
  .cta-zone {
    padding: 5rem 0 6rem;
  }

  .cta-panel {
    position: relative;
    background: linear-gradient(135deg, rgba(34, 216, 207, 0.08), rgba(56, 189, 248, 0.04)), var(--bg-deep);
    border: 1px solid rgba(34, 216, 207, 0.18);
    border-radius: 2rem;
    padding: 3rem 1.75rem;
    text-align: center;
    overflow: hidden;
    box-shadow: 0 0 80px -24px rgba(34, 216, 207, 0.3);
  }

  .cta-panel::before {
    content: '';
    position: absolute;
    top: -80px;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 180px;
    background: radial-gradient(ellipse, rgba(34, 216, 207, 0.18), transparent 70%);
    pointer-events: none;
  }

  .cta-panel h2 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-title);
    letter-spacing: -0.02em;
    margin-bottom: 0.8rem;
    position: relative;
  }

  .cta-panel p {
    color: var(--silver);
    font-size: 0.95rem;
    max-width: 560px;
    margin: 0 auto 2rem;
    line-height: 1.8;
    position: relative;
  }

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

  @media (min-width: 768px) {
    .cta-panel {
      padding: 4rem 3rem;
    }

    .cta-panel h2 {
      font-size: 2rem;
    }
  }

  /* ===== 页脚 ===== */
  .site-footer {
    background: var(--bg-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 4rem 0 0;
  }

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

  .footer-brand .logo-link {
    font-size: 1.1rem;
    margin-bottom: 1rem;
  }

  .footer-desc {
    color: var(--silver);
    font-size: 0.9rem;
    line-height: 1.75;
    max-width: 320px;
    margin-top: 1rem;
  }

  .footer-col-title {
    color: var(--text-title);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 1rem;
  }

  .footer-col ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
  }

  .footer-col ul a {
    color: var(--silver);
    font-size: 0.9rem;
    transition: var(--transition);
  }

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

  .footer-contact {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    color: var(--silver);
    font-size: 0.9rem;
  }

  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    align-items: center;
    text-align: center;
  }

  .footer-bottom p {
    color: var(--text-muted);
    font-size: 0.8rem;
  }

  @media (min-width: 768px) {
    .footer-grid {
      grid-template-columns: 1.2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    .footer-bottom {
      flex-direction: row;
      justify-content: space-between;
      text-align: left;
    }
  }

/* roulang page: category3 */
:root {
  --bg-night: #060D1A;
  --bg-navy: #0C1B30;
  --border-white: rgba(255, 255, 255, 0.10);
  --text-body: #E2E8F0;
  --text-heading: #F8FAFC;
  --text-muted: #64748B;
  --accent: #22D8CF;
  --accent2: #38BDF8;
  --font-sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --glow: 0 0 40px -12px rgba(34, 216, 207, 0.35);
  --btn-glow: 0 0 30px -6px rgba(34, 216, 207, 0.5);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-night);
  color: var(--text-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 85% 10%, rgba(34,216,207,0.08) 0%, transparent 40%),
    radial-gradient(circle at 10% 80%, rgba(56,189,248,0.05) 0%, transparent 30%);
  pointer-events: none;
  z-index: 0;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font-family: inherit; }

.container {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}
@media (min-width: 768px) {
  .container { padding: 0 2rem; }
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4rem;
  background: rgba(6,13,26,0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  z-index: 100;
  transition: background 0.3s ease;
}
@media (min-width: 768px) {
  .site-header { height: 5rem; }
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: 0.01em;
}
.logo-dot {
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 9999px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 14px rgba(34, 216, 207, 0.8);
  flex-shrink: 0;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.main-nav a {
  position: relative;
  font-size: 0.9375rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.3s ease;
  padding: 0.25rem 0;
}
.main-nav a:hover { color: var(--accent); }
.main-nav a.active {
  color: var(--accent);
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.25rem;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  box-shadow: 0 0 12px rgba(34,216,207,0.5);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nav-cta-desktop {
  display: none;
}
@media (min-width: 768px) {
  .nav-cta-desktop { display: inline-flex; }
}
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 0.75rem;
  background: rgba(255,255,255,0.04);
  cursor: pointer;
  padding: 0 0.7rem;
  transition: border-color 0.3s;
}
.hamburger:hover { border-color: rgba(34,216,207,0.5); }
.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-body);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
@media (min-width: 768px) {
  .hamburger { display: none; }
}
.mobile-menu {
  position: fixed;
  top: 4rem;
  left: 0;
  width: 100%;
  background: rgba(6,13,26,0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4,0,0.2,1);
  z-index: 99;
}
.mobile-menu.open { max-height: 420px; }
.mobile-menu a {
  padding: 0.875rem 0.75rem;
  border-radius: 0.75rem;
  font-size: 1rem;
  color: var(--text-body);
  font-weight: 500;
  transition: background 0.3s, color 0.3s;
}
.mobile-menu a:hover { background: rgba(255,255,255,0.06); color: var(--accent); }
.mobile-menu a.active { color: var(--accent); background: rgba(34,216,207,0.06); }
@media (min-width: 768px) {
  .mobile-menu { display: none; }
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 700;
  color: #04121A;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: 9999px;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--btn-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 45px -4px rgba(34,216,207,0.65); }
.btn-primary:active { transform: translateY(0); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #fff;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.20);
  border-radius: 9999px;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
}
.btn-secondary:hover { background: rgba(255,255,255,0.10); border-color: var(--accent); color: var(--accent); }

.page-hero {
  position: relative;
  padding: 8rem 0 4rem;
  background:
    linear-gradient(to bottom, rgba(6,13,26,0.82), var(--bg-night)),
    url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 56rem;
  text-align: center;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(34,216,207,0.08);
  border: 1px solid rgba(34,216,207,0.25);
  border-radius: 9999px;
  padding: 0.375rem 1rem;
  margin-bottom: 1.5rem;
}
.page-hero h1 {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text-heading);
  margin-bottom: 1.25rem;
}
@media (min-width: 768px) {
  .page-hero h1 { font-size: 3rem; }
}
.page-hero .hero-desc {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-body);
  max-width: 42rem;
  margin: 0 auto;
  opacity: 0.9;
}

.section { padding: 4rem 0; }
@media (min-width: 768px) {
  .section { padding: 5.5rem 0; }
}
.section-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.section-label::before {
  content: '';
  width: 0.25rem;
  height: 1rem;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2));
}
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-heading);
  margin-bottom: 1rem;
}
@media (min-width: 768px) {
  .section-title { font-size: 2.125rem; }
}
.section-sub {
  font-size: 0.9375rem;
  color: var(--text-muted);
  max-width: 40rem;
  margin-bottom: 2.5rem;
}

.glass-card {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 16px;
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}
.glass-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.20);
  box-shadow: var(--glow);
}

.support-main {
  background: var(--bg-navy);
  border-top: 1px solid rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  position: relative;
}
.support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
@media (min-width: 1024px) {
  .support-grid { grid-template-columns: 1.1fr 0.9fr; gap: 3rem; }
}
.service-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.service-card {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.5rem;
}
.service-card .service-icon {
  width: 3rem;
  height: 3rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.875rem;
  background: rgba(34,216,207,0.10);
  border: 1px solid rgba(34,216,207,0.20);
  color: var(--accent);
  font-size: 1.125rem;
}
.service-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.375rem;
}
.service-card p {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text-body);
  opacity: 0.82;
}
.service-card .service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: 0.625rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap 0.3s ease;
}
.service-card .service-link:hover { gap: 0.625rem; }

.faq-wrap .faq-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 0.75rem;
}
.faq-wrap .faq-tip {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.faq-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  margin-bottom: 0.875rem;
  transition: border-color 0.3s ease, background 0.3s ease;
  overflow: hidden;
}
.faq-card.active {
  border-color: rgba(34,216,207,0.35);
  background: rgba(34,216,207,0.04);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  padding: 1.125rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-heading);
  transition: color 0.3s ease;
}
.faq-question:hover { color: var(--accent); }
.faq-icon {
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  background: rgba(34,216,207,0.12);
  color: var(--accent);
  font-size: 1rem;
  font-weight: 700;
  transition: transform 0.3s ease, background 0.3s ease;
}
.faq-card.active .faq-icon {
  background: rgba(34,216,207,0.25);
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);
}
.faq-answer-inner {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-body);
  opacity: 0.85;
}

.resources-section {
  position: relative;
  overflow: hidden;
}
.resource-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 640px) {
  .resource-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .resource-grid { grid-template-columns: repeat(4, 1fr); }
}
.resource-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}
.resource-card .resource-cover {
  width: 100%;
  height: 9rem;
  object-fit: cover;
  border-radius: 0.875rem;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #1E4A6F, #0C1B30);
}
.resource-tag {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(34,216,207,0.08);
  border: 1px solid rgba(34,216,207,0.20);
  border-radius: 9999px;
  padding: 0.125rem 0.625rem;
  margin-bottom: 0.625rem;
}
.resource-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.5rem;
}
.resource-card p {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--text-muted);
  flex: 1;
}
.resource-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 1rem;
  transition: gap 0.3s ease;
}
.resource-link:hover { gap: 0.625rem; }

.open-cta {
  position: relative;
  padding: 5rem 0;
  background:
    linear-gradient(rgba(6,13,26,0.88), rgba(6,13,26,0.92)),
    url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
  border-top: 1px solid rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.cta-inner {
  max-width: 48rem;
  margin: 0 auto;
  text-align: center;
}
.cta-inner h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 1rem;
}
@media (min-width: 768px) {
  .cta-inner h2 { font-size: 2.25rem; }
}
.cta-inner .cta-desc {
  font-size: 1rem;
  color: var(--text-body);
  opacity: 0.85;
  max-width: 36rem;
  margin: 0 auto 2rem;
  line-height: 1.75;
}
.cta-inner .btn-primary {
  font-size: 1.0625rem;
  padding: 0.875rem 2.25rem;
}
.cta-note {
  margin-top: 1.25rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.contact-form {
  max-width: 44rem;
  margin: 2.5rem auto 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  text-align: left;
}
@media (min-width: 640px) {
  .contact-form { grid-template-columns: 1fr 1fr; }
}
.contact-form .form-group { display: flex; flex-direction: column; gap: 0.375rem; }
.contact-form .form-group.full { grid-column: 1 / -1; }
.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-body);
}
.form-input, .form-textarea {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  color: var(--text-heading);
  outline: none;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.form-input:focus, .form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(34,216,207,0.12);
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--text-muted); }
.form-textarea { min-height: 7rem; resize: vertical; }
.form-submit {
  grid-column: 1 / -1;
  justify-self: center;
  min-width: 12rem;
}
.privacy-note {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.site-footer {
  background: #050B15;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 3.25rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
@media (min-width: 640px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1.2fr; }
}
.footer-brand .logo-link {
  font-size: 1.25rem;
  margin-bottom: 0.875rem;
}
.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 20rem;
}
.footer-col-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 1rem;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.3s ease;
}
.footer-col a:hover { color: var(--accent); }
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.04);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 0.625rem;
  text-align: center;
}
@media (min-width: 768px) {
  .footer-bottom { flex-direction: row; text-align: left; }
}
.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}