/* roulang page: index */
@layer base {
      :root {
        --primary: #1A3C6E;
        --accent: #C8A96E;
        --metal: #D4AF37;
        --bg: #F8F9FC;
        --card: #FFFFFF;
        --text: #1E293B;
        --text-light: #64748B;
        --border: #E2E8F0;
        --positive: #2E7D32;
        --radius-card: 12px;
        --radius-btn: 8px;
        --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      }
      *, *::before, *::after { box-sizing: border-box; }
      body {
        font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
        color: #1E293B;
        background-color: #F8F9FC;
        margin: 0;
        line-height: 1.75;
        -webkit-font-smoothing: antialiased;
      }
      img { max-width: 100%; height: auto; display: block; }
      a { text-decoration: none; color: inherit; transition: all 0.25s ease; }
      .container {
        max-width: 1280px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 24px;
        padding-right: 24px;
      }
      @media (max-width: 640px) {
        .container { padding-left: 16px; padding-right: 16px; }
      }
    }
    .nav-glass {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(26,60,110,0.08);
      box-shadow: 0 2px 16px rgba(0,0,0,0.06);
      transition: all 0.25s ease;
    }
    .nav-scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.12);
    }
    .btn-primary {
      background-color: #1A3C6E;
      color: white;
      border-radius: 8px;
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: 1.5px solid transparent;
    }
    .btn-primary:hover {
      background-color: #0F2A52;
      border-color: #C8A96E;
      box-shadow: 0 4px 12px rgba(26,60,110,0.25);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid #1A3C6E;
      color: #1A3C6E;
      border-radius: 8px;
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-secondary:hover {
      background-color: rgba(26,60,110,0.1);
      border-color: #0F2A52;
    }
    .btn-cta {
      background-color: #D4AF37;
      color: #1A3C6E;
      border-radius: 8px;
      padding: 14px 32px;
      font-weight: 700;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-cta:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 18px rgba(212,175,55,0.4);
    }
    .card-hover {
      transition: all 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 2px 6px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.10);
    }
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    @media (max-width: 640px) {
      .masonry-grid { grid-template-columns: 1fr; }
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px;
      border-bottom: 1px solid #E2E8F0;
      font-weight: 600;
      font-size: 1.125rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 20px;
      color: #64748B;
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 20px 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 1.5rem;
      color: #C8A96E;
      font-weight: 300;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 80px;
      left: 16px;
      right: 16px;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      padding: 24px;
      z-index: 40;
      flex-direction: column;
      gap: 20px;
      border: 1px solid rgba(26,60,110,0.08);
    }
    .mobile-menu.open { display: flex; }
    @media (min-width: 769px) {
      .mobile-menu { display: none !important; }
    }