/* roulang page: index */
/* 基础重置与设计变量 */
    :root {
      --primary: #0A6E5C;
      --primary-soft: rgba(10, 110, 92, 0.08);
      --accent: #F59E0B;
      --accent-dark: #D97706;
      --bg: #F8FAFB;
      --surface: #FFFFFF;
      --dark-bg: #0F172A;
      --text-main: #1E293B;
      --text-soft: #64748B;
      --text-light: #94A3B8;
      --border: #E2E8F0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(10,110,92,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航样式 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--surface);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      height: 68px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--primary);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 20px;
    }

    .logo-text {
      font-size: 22px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      text-decoration: none;
      color: #475569;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s;
    }

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

    .search-box {
      display: flex;
      align-items: center;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 6px 16px;
      gap: 8px;
      transition: border 0.2s;
    }

    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 140px;
      color: var(--text-main);
    }

    .search-box:focus-within {
      border-color: var(--primary);
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      text-decoration: none;
      display: inline-block;
      font-size: 15px;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--accent-dark);
      transform: scale(1.03);
    }

    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: background 0.2s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--primary-soft);
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }

    /* 指标卡片 */
    .metric-card {
      background: var(--surface);
      border-radius: 10px;
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }
    .metric-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .metric-value {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.2;
      font-feature-settings: "tnum";
    }

    /* 服务卡片 */
    .service-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      min-width: 300px;
      flex: 0 0 auto;
      width: 340px;
    }
    .service-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .service-icon {
      width: 40px;
      height: 40px;
      color: var(--primary);
    }
    .decor-line {
      width: 24px;
      height: 2px;
      background: var(--primary);
      margin: 12px 0;
      transition: width 0.3s;
    }
    .service-card:hover .decor-line {
      width: 48px;
    }

    /* 对比卡片 */
    .compare-card {
      border-radius: var(--radius-card);
      padding: 32px;
      background: var(--surface);
      box-shadow: var(--shadow-sm);
      height: 100%;
    }
    .vs-badge {
      background: var(--primary);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    /* FAQ手风琴 */
    .faq-item {
      border: 1px solid var(--border);
      border-radius: 8px;
      margin-bottom: 12px;
      background: var(--surface);
      transition: all 0.3s;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-main);
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-soft);
      line-height: 1.8;
      display: none;
    }
    .faq-item.active {
      border-left: 3px solid var(--primary);
      background: #F1F5F9;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA深色区块 */
    .cta-dark {
      background: var(--dark-bg);
      color: white;
    }
    .cta-input {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 8px;
      padding: 12px 16px;
      color: white;
      width: 100%;
      margin-bottom: 16px;
      outline: none;
      transition: border 0.2s;
    }
    .cta-input:focus {
      border-color: var(--accent);
    }

    .footer-link {
      color: var(--text-light);
      text-decoration: none;
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: white;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .service-scroll {
        flex-wrap: nowrap;
        overflow-x: auto;
        gap: 20px;
        padding-bottom: 16px;
      }
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .metric-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
      }
      .compare-row {
        flex-direction: column;
      }
      .service-card {
        width: 100%;
        min-width: auto;
      }
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 28px !important;
      }
      h2 {
        font-size: 24px !important;
      }
    }