/* roulang page: index */
:root {
      --primary-green: #00B248;
      --dark-charcoal: #1E1E1E;
      --data-cyan: #00ACC1;
      --bg-light: #F5F7FA;
      --bg-dark: #121212;
      --amber-cta: #FFAB00;
      --amber-hover: #FF8F00;
      --text-main: #2D3748;
      --text-sub: #718096;
      --text-on-dark: #E2E8F0;
      --border-light: #E2E8F0;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", sans-serif;
      --font-mono: "Inter", "Roboto", "DIN", system-ui, -apple-system, sans-serif;
      --radius-card: 14px;
      --radius-btn: 24px;
      --nav-height: 68px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      margin: 0;
      padding: 0;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    .container-main {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航样式 */
    .nav-blur {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226,232,240,0.5);
      height: var(--nav-height);
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 50;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    }
    .nav-link {
      color: #4A5568;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-link:hover {
      color: var(--primary-green);
      border-bottom-color: var(--primary-green);
    }
    .btn-cta-nav {
      background-color: var(--amber-cta);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      box-shadow: 0 4px 10px rgba(255,171,0,0.25);
      transition: background 0.2s, transform 0.2s;
      font-size: 0.9rem;
    }
    .btn-cta-nav:hover {
      background-color: var(--amber-hover);
      transform: scale(1.03);
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--amber-cta);
      color: #1E1E1E;
      font-weight: 700;
      border-radius: 30px;
      padding: 14px 32px;
      box-shadow: 0 6px 18px rgba(255,171,0,0.3);
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--amber-hover);
      transform: scale(1.03);
      box-shadow: 0 10px 22px rgba(255,143,0,0.35);
    }
    .btn-outline {
      border: 2px solid var(--primary-green);
      color: var(--primary-green);
      font-weight: 600;
      border-radius: 30px;
      padding: 12px 30px;
      transition: all 0.2s;
      display: inline-block;
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary-green);
      color: white;
    }
    .btn-light-outline {
      border: 2px solid white;
      color: white;
      font-weight: 600;
      border-radius: 30px;
      padding: 12px 30px;
      transition: all 0.2s;
      background: transparent;
    }
    .btn-light-outline:hover {
      background: white;
      color: var(--dark-charcoal);
    }

    /* 卡片 */
    .card-service {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      transition: box-shadow 0.25s, transform 0.25s;
      border: 1px solid var(--border-light);
    }
    .card-service:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .data-card-dark {
      background: var(--dark-charcoal);
      border-radius: 16px;
      padding: 24px 20px;
      color: white;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-weight: 300;
      font-size: 3.2rem;
      line-height: 1.1;
      color: var(--primary-green);
    }
    .stat-label {
      color: #A0AEC0;
      font-size: 0.9rem;
      font-weight: 500;
      letter-spacing: 0.3px;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
      cursor: pointer;
      transition: color 0.2s;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      color: #4A5568;
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 14px;
    }
    .faq-icon {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      border: 2px solid var(--primary-green);
      color: var(--primary-green);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      transition: background 0.2s, color 0.2s;
    }
    .faq-item:hover .faq-question {
      color: var(--primary-green);
    }

    /* 对比区块 */
    .compare-left {
      background: #F1F5F9;
      border-radius: 16px;
      padding: 28px;
    }
    .compare-right {
      background: #E8F5E9;
      border-radius: 16px;
      padding: 28px;
      border: 1px solid rgba(0,178,72,0.2);
    }
    .check-green {
      color: var(--primary-green);
      font-weight: bold;
      margin-right: 8px;
    }
    .cross-red {
      color: #C53030;
      font-weight: bold;
      margin-right: 8px;
    }

    @media (max-width: 768px) {
      .stat-number {
        font-size: 2.5rem;
      }
      .container-main {
        padding-left: 16px;
        padding-right: 16px;
      }
      .nav-link {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }