/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary: #0A1F3F;
      --secondary: #00C9A7;
      --accent: #FF6B35;
      --bg-light: #F7F9FC;
      --card-bg: #FFFFFF;
      --text-primary: #0A1F3F;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-white: #FFFFFF;
      --border-light: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(10,31,63,0.04);
      --shadow-md: 0 8px 30px rgba(10,31,63,0.08);
      --shadow-lg: 0 20px 40px rgba(10,31,63,0.12);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-tag: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --transition: 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: 3rem;
      line-height: 1.2;
    }
    h2 {
      font-size: 2rem;
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.25rem;
      line-height: 1.4;
      font-weight: 600;
    }
    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    .text-accent {
      color: var(--secondary);
    }
    .bg-primary {
      background-color: var(--primary);
    }
    .bg-secondary {
      background-color: var(--secondary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 1rem;
      gap: 0.5rem;
    }
    .btn-primary {
      background-color: var(--accent);
      color: white;
      border-color: var(--accent);
    }
    .btn-primary:hover {
      background-color: #e55a2b;
      border-color: #e55a2b;
      transform: scale(1.03);
      box-shadow: var(--shadow-md);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
      transform: scale(1.03);
      box-shadow: var(--shadow-md);
    }
    .btn-white-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
    }
    .btn-white-outline:hover {
      background: white;
      color: var(--primary);
      transform: scale(1.03);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--secondary);
      transform: translateY(-4px);
    }
    .badge {
      display: inline-block;
      padding: 0.25rem 0.75rem;
      border-radius: var(--radius-tag);
      font-size: 0.75rem;
      font-weight: 600;
      background-color: #F1F5F9;
      color: var(--text-muted);
    }
    .data-badge {
      font-family: var(--font-mono);
      font-weight: 700;
      color: var(--secondary);
    }
    /* navigation */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226,232,240,0.6);
      transition: box-shadow 0.3s;
    }
    .navbar.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-body);
      padding: 0.5rem 0.25rem;
      margin: 0 0.75rem;
      border-bottom: 3px solid transparent;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
      border-bottom-color: var(--secondary);
    }
    .hot-tag {
      background: rgba(0,201,167,0.1);
      color: var(--secondary);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    /* mobile menu */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.5rem; }
      .section-padding { padding-top: 3rem; padding-bottom: 3rem; }
      .mobile-menu { display: block; }
      .desktop-nav { display: none; }
    }
    /* accordion */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 1rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1rem;
    }
    .compare-highlight {
      background: linear-gradient(135deg, #0A1F3F 0%, #153357 100%);
      color: white;
      border-radius: var(--radius-card);
      transform: scale(1.02);
    }