/* roulang page: index */
:root {
      --primary: #3E2723;
      --primary-hover: #2B1B17;
      --accent: #D4AF37;
      --bg-warm: #FDFBF7;
      --bg-light: #F5F2EB;
      --text-main: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-muted: #8C8C8C;
      --border-light: rgba(62,39,35,0.12);
      --shadow-card: 0 4px 16px rgba(62,39,35,0.06);
      --shadow-hover: 0 12px 28px rgba(62,39,35,0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans', sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, .font-serif {
      font-family: 'Noto Serif SC', 'Source Han Serif SC', 'Times New Roman', Georgia, serif;
      letter-spacing: -0.01em;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    /* 导航分屏风格 */
    .glass-nav {
      background: rgba(253, 251, 247, 0.85);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(62,39,35,0.08);
      transition: var(--transition);
    }

    .nav-link {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 0.4rem 0;
      transition: color 0.2s;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--accent);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 6px 18px rgba(62,39,35,0.2);
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(62,39,35,0.3);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.7rem 2rem;
      font-weight: 600;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
    }

    .btn-secondary:hover {
      background: rgba(62,39,35,0.06);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }

    .btn-accent {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 0.8rem 2.2rem;
      transition: 0.25s;
      box-shadow: 0 8px 18px rgba(212,175,55,0.3);
    }

    .btn-accent:hover {
      background: #e6c24a;
      transform: scale(1.02);
    }

    /* 卡片 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, box-shadow 0.3s;
      border: 1px solid rgba(62,39,35,0.04);
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(62,39,35,0.1);
      padding: 18px 0;
      cursor: pointer;
    }

    .faq-question {
      font-size: 1.15rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
      color: var(--text-secondary);
      font-size: 1rem;
    }

    .faq-item.active .faq-answer {
      max-height: 160px;
      padding-top: 14px;
    }

    /* 数字墙 */
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }

    @media (max-width: 768px) {
      .stat-number {
        font-size: 2.2rem;
      }
      h1 {
        font-size: 2.4rem !important;
      }
    }

    /* 汉堡菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 64px;
      left: 0;
      width: 100%;
      box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      padding: 16px 24px;
      gap: 12px;
    }

    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }

    @media (min-width: 769px) {
      .mobile-menu {
        display: none !important;
      }
    }