/* roulang page: index */
:root {
      --deep-green: #1B5E20;
      --vibrant-orange: #F57C00;
      --bg-warm: #FAFAF5;
      --card-bg: #FFFFFF;
      --card-border: #E8E8E0;
      --text-primary: #1A1A1A;
      --text-body: #3A3A3A;
      --text-muted: #6B6B6B;
      --tactical-black: #212121;
      --success-green: #2E7D32;
      --light-green-bg: #E8F5E9;
      --case-bg: #F1F8E9;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
      --glass-bg: rgba(255,255,255,0.75);
      --glass-border: rgba(0,0,0,0.06);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 玻璃导航 */
    .glass-nav {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--glass-border);
      box-shadow: 0 1px 0 rgba(255,255,255,0.2) inset, 0 2px 8px rgba(0,0,0,0.08);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .glass-nav.scrolled {
      background: rgba(250,250,245,0.95);
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }
    .nav-link {
      color: var(--tactical-black);
      font-weight: 500;
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 2px;
    }
    .nav-link:hover {
      color: var(--vibrant-orange);
      border-bottom-color: var(--vibrant-orange);
    }
    .btn-primary {
      background-color: var(--vibrant-orange);
      color: white;
      font-weight: 600;
      border-radius: 8px;
      padding: 12px 28px;
      transition: background 0.2s, transform 0.1s;
      border: none;
      cursor: pointer;
      letter-spacing: 0.02em;
    }
    .btn-primary:hover {
      background-color: #E65100;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--deep-green);
      color: var(--deep-green);
      font-weight: 600;
      border-radius: 8px;
      padding: 10px 26px;
      transition: all 0.2s;
      letter-spacing: 0.02em;
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: var(--light-green-bg);
      border-color: #1B5E20;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 2rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 4px;
      background: var(--vibrant-orange);
      border-radius: 2px;
    }
    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }
    .card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--deep-green);
    }
    .feature-icon {
      width: 56px;
      height: 56px;
      background-color: var(--light-green-bg);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.25rem;
    }
    .pricing-card {
      border-radius: 16px;
      background: white;
      border: 1px solid var(--card-border);
      transition: all 0.2s;
    }
    .pricing-card.featured {
      border: 2px solid var(--vibrant-orange);
      background: #FFF9F2;
      position: relative;
    }
    .badge {
      background: var(--vibrant-orange);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .faq-item {
      border-bottom: 1px solid #E8E8E0;
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-primary);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--vibrant-orange);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-body);
      line-height: 1.7;
      border-left: 3px solid var(--light-green-bg);
      padding-left: 1rem;
      margin-left: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 0.8rem;
      padding-bottom: 1.2rem;
    }
    .footer-link {
      color: rgba(255,255,255,0.8);
      transition: color 0.2s;
      text-decoration: none;
    }
    .footer-link:hover {
      color: var(--vibrant-orange);
      text-decoration: underline;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-radius: 0 0 16px 16px;
      }
      .mobile-menu.open {
        display: flex;
      }
    }