/* roulang page: index */
:root {
      --primary: #1B8A3D;
      --primary-light: #e8f5ec;
      --primary-dark: #146b2e;
      --secondary: #1E1E1E;
      --accent: #F15A24;
      --accent-hover: #D94A1E;
      --bg: #F4F7F5;
      --surface: #FFFFFF;
      --text: #1E1E1E;
      --text-secondary: #4B5563;
      --text-light: #6B7280;
      --border-light: #E8EDEA;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-tag: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.02em;
      margin: 0;
    }
    h1 {
      font-size: clamp(2.2rem, 5vw, 3.4rem);
      font-weight: 700;
      line-height: 1.2;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.4rem);
      line-height: 1.3;
      position: relative;
      display: inline-block;
    }
    h2::before {
      content: '';
      display: inline-block;
      width: 6px;
      height: 28px;
      background: var(--primary);
      border-radius: 4px;
      margin-right: 14px;
      vertical-align: middle;
      transform: translateY(-2px);
    }
    h3 {
      font-size: 1.3rem;
      line-height: 1.4;
    }
    .section-title {
      margin-bottom: 2.5rem;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 自定义卡片样式 */
    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border: 1px solid var(--border-light);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: transparent;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      letter-spacing: 0.02em;
      box-shadow: 0 4px 12px rgba(241,90,36,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 0 20px rgba(241,90,36,0.5);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 26px;
      transition: all 0.25s ease;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    /* 导航卡片化 */
    .nav-panel {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      border-radius: 0 0 20px 20px;
      box-shadow: 0 6px 24px rgba(0,0,0,0.06);
      padding: 8px 24px;
    }
    .nav-chip {
      background: #f0f7f2;
      color: var(--secondary);
      border-radius: 30px;
      padding: 8px 18px;
      font-weight: 500;
      transition: all 0.2s;
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 0.95rem;
    }
    .nav-chip:hover {
      background: var(--primary-light);
      color: var(--primary);
    }
    .faq-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 18px 22px;
      margin-bottom: 14px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      transition: all 0.3s ease;
      border-left: 4px solid transparent;
    }
    .faq-card.active {
      box-shadow: var(--shadow-md);
      border-left-color: var(--primary);
      background: #fafdfb;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
      color: var(--text-secondary);
    }
    .faq-card.active .faq-answer {
      max-height: 200px;
      padding-top: 14px;
    }
    /* 对比表卡片 */
    .compare-card {
      background: var(--surface);
      border-radius: 20px;
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .compare-highlight {
      border: 2px solid var(--primary);
      background: #f6fbf7;
    }
    footer a {
      color: #d1d5db;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .nav-panel {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
      }
      .mobile-stack {
        flex-direction: column;
        align-items: flex-start;
      }
      .hero-img {
        height: 260px;
        width: 100%;
      }
    }