/* roulang page: index */
:root {
      --primary: #0A6E5C;
      --primary-dark: #074B3F;
      --accent: #C49A2B;
      --accent-hover: #A87F1E;
      --bg: #F4F2EF;
      --card-white: #FFFFFF;
      --text-primary: #1E2B2C;
      --text-secondary: #6B7B7D;
      --border-light: #E6E3DF;
      --success: #0F8B5E;
      --warning: #D96C2B;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.08);
      --transition: 0.25s ease;
      --font-system: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-system);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; height: auto; display: block; }
    .container-custom { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

    /* 导航栏 */
    .nav-bar {
      position: fixed; top: 0; left: 0; width: 100%; background: #fff;
      box-shadow: 0 1px 8px rgba(0,0,0,0.05); z-index: 1000;
      height: 72px; display: flex; align-items: center;
    }
    .nav-container {
      display: flex; align-items: center; justify-content: space-between;
      width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px;
    }
    .logo {
      font-size: 22px; font-weight: 700; color: var(--primary);
      display: flex; align-items: center; gap: 6px; white-space: nowrap;
    }
    .logo i { color: var(--accent); font-size: 10px; }
    .search-box {
      flex: 1; max-width: 380px; margin: 0 24px;
      position: relative;
    }
    .search-box input {
      width: 100%; padding: 10px 20px 10px 44px; border-radius: 24px;
      border: 1px solid var(--border-light); background: var(--bg);
      font-size: 15px; outline: none; transition: var(--transition);
    }
    .search-box input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(10,110,92,0.1); }
    .search-box i {
      position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
      color: var(--text-secondary); font-size: 16px;
    }
    .nav-links { display: flex; align-items: center; gap: 28px; }
    .nav-links a {
      font-weight: 500; font-size: 15px; color: var(--text-primary);
      transition: color var(--transition); white-space: nowrap;
    }
    .nav-links a:hover { color: var(--primary); }
    .btn-nav {
      background: var(--primary); color: #fff; padding: 10px 22px;
      border-radius: 24px; font-weight: 600; font-size: 14px;
      transition: background var(--transition); white-space: nowrap;
    }
    .btn-nav:hover { background: var(--primary-dark); color: #fff; }
    .hamburger { display: none; font-size: 24px; cursor: pointer; color: var(--text-primary); }
    @media (max-width: 1024px) {
      .search-box { max-width: 240px; }
      .nav-links { gap: 16px; }
    }
    @media (max-width: 768px) {
      .nav-links, .search-box { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none; position: absolute; top: 72px; left: 0; width: 100%;
        background: #fff; flex-direction: column; padding: 20px; gap: 16px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.08);
      }
      .mobile-menu.active { display: flex; }
      .mobile-menu .search-box { display: block; max-width: 100%; margin: 0; }
      .mobile-menu .nav-links { display: flex; flex-direction: column; gap: 12px; }
    }

    /* 板块通用 */
    section { padding: 80px 0; }
    @media (max-width: 768px) { section { padding: 48px 0; } }
    .section-title {
      font-size: 38px; font-weight: 600; margin-bottom: 24px; position: relative;
      display: inline-block; color: var(--text-primary);
    }
    .section-title::after {
      content: ''; display: block; width: 48px; height: 4px; background: var(--primary);
      margin-top: 10px; border-radius: 2px;
    }
    .section-title.text-center::after { margin-left: auto; margin-right: auto; }
    .text-center { text-align: center; }
    .btn {
      display: inline-block; font-weight: 600; border-radius: var(--radius-sm);
      padding: 14px 32px; transition: all var(--transition); cursor: pointer;
      font-size: 16px; text-align: center;
    }
    .btn-primary { background: var(--primary); color: #fff; border: none; }
    .btn-primary:hover { background: var(--primary-dark); box-shadow: 0 4px 12px rgba(10,110,92,0.3); }
    .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
    .btn-outline:hover { background: var(--primary); color: #fff; }
    .btn-accent { background: var(--accent); color: #fff; border: none; }
    .btn-accent:hover { background: var(--accent-hover); }

    /* Hero */
    .hero {
      padding-top: 120px; background: linear-gradient(90deg, #fff 0%, #F4F2EF 100%);
      position: relative; overflow: hidden;
    }
    .hero-grid { display: flex; align-items: center; gap: 48px; }
    .hero-left { flex: 1.1; }
    .hero-right { flex: 0.9; display: flex; flex-direction: column; gap: 20px; }
    .hero h1 {
      font-size: 52px; font-weight: 700; line-height: 1.2; letter-spacing: -0.5px;
      color: var(--text-primary); margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px; color: var(--text-secondary); margin-bottom: 32px; max-width: 480px;
    }
    .data-card {
      background: rgba(255,255,255,0.85); backdrop-filter: blur(6px);
      border-radius: var(--radius-md); padding: 24px 28px;
      box-shadow: var(--shadow-sm); border: 1px solid var(--border-light);
      display: flex; align-items: center; gap: 20px;
    }
    .data-number {
      font-size: 34px; font-weight: 700; color: var(--accent);
      font-family: "DIN Alternate", var(--font-system);
    }
    .data-label { font-size: 15px; color: var(--text-secondary); }
    @media (max-width: 768px) {
      .hero-grid { flex-direction: column; }
      .hero h1 { font-size: 34px; }
      .data-number { font-size: 28px; }
    }

    /* 核心优势 */
    .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .feature-card {
      background: var(--card-white); border-radius: var(--radius-lg); padding: 32px;
      box-shadow: var(--shadow-sm); transition: all var(--transition);
      border: 1px solid var(--border-light);
    }
    .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .feature-icon {
      width: 56px; height: 56px; background: rgba(10,110,92,0.08);
      border-radius: 50%; display: flex; align-items: center; justify-content: center;
      margin-bottom: 20px; color: var(--primary); font-size: 24px;
    }
    .feature-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
    .badge {
      display: inline-flex; align-items: center; gap: 4px;
      background: rgba(196,154,43,0.12); color: var(--accent); padding: 4px 12px;
      border-radius: 20px; font-size: 13px; font-weight: 600; margin-top: 16px;
    }

    /* 服务矩阵 */
    .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .service-card {
      background: var(--card-white); border-radius: var(--radius-lg); padding: 28px;
      box-shadow: var(--shadow-sm); transition: all var(--transition);
      border: 1px solid var(--border-light); text-align: left;
    }
    .service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .service-card i { font-size: 32px; color: var(--primary); margin-bottom: 16px; }
    .service-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
    .service-link { color: var(--primary); font-weight: 600; margin-top: 12px; display: inline-block; }

    /* 对比区 */
    .compare-wrapper {
      display: flex; align-items: stretch; gap: 24px; position: relative;
    }
    .compare-left, .compare-right {
      flex: 1; padding: 36px; border-radius: var(--radius-lg);
    }
    .compare-left { background: #F9F5F2; border: 1px solid #E6DCD0; }
    .compare-right { background: #F0F7F5; border: 1px solid var(--primary); }
    .vs-badge {
      position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
      background: var(--accent); color: #fff; width: 56px; height: 56px;
      border-radius: 50%; display: flex; align-items: center; justify-content: center;
      font-weight: 700; font-size: 22px; z-index: 2;
    }
    .compare-list { list-style: none; margin-top: 20px; }
    .compare-list li { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
    .text-warning { color: var(--warning); }
    .text-success { color: var(--success); }
    @media (max-width: 768px) {
      .compare-wrapper { flex-direction: column; }
      .vs-badge { position: static; margin: 20px auto; transform: none; }
    }

    /* 数据墙 */
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .stat-item {
      background: var(--card-white); border: 1px solid var(--border-light);
      border-radius: var(--radius-md); padding: 24px; text-align: center;
      transition: border-color var(--transition);
    }
    .stat-item:hover { border-color: var(--primary); }
    .stat-number { font-size: 32px; font-weight: 700; color: var(--accent); }

    /* FAQ */
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .faq-item {
      background: var(--card-white); border-radius: var(--radius-md);
      border: 1px solid var(--border-light); overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px; font-weight: 600; display: flex; justify-content: space-between;
      align-items: center; cursor: pointer; background: #fff; transition: background 0.2s;
    }
    .faq-question i { transition: transform 0.3s; }
    .faq-answer {
      max-height: 0; overflow: hidden; padding: 0 24px; background: #F9FAFB;
      transition: max-height 0.35s ease, padding 0.35s ease;
    }
    .faq-item.active .faq-answer { max-height: 200px; padding: 16px 24px; }
    .faq-item.active .faq-question { background: rgba(10,110,92,0.04); }
    .faq-item.active .faq-question i { transform: rotate(45deg); }
    @media (max-width: 768px) { .faq-grid { grid-template-columns: 1fr; } }

    /* 表单区 */
    .cta-section {
      background: linear-gradient(135deg, #0A6E5C 0%, #074B3F 100%);
    }
    .form-card {
      background: #fff; border-radius: var(--radius-lg); padding: 40px;
      box-shadow: 0 12px 30px rgba(0,0,0,0.15);
    }
    .form-card input, .form-card textarea {
      width: 100%; padding: 12px 16px; border: 1px solid var(--border-light);
      border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 15px;
    }
    .trust-badges { display: flex; gap: 24px; align-items: center; margin-top: 16px; color: var(--text-secondary); }

    /* 页脚 */
    .footer {
      background: #1E2B2C; color: #ccc; padding: 48px 0 24px;
    }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 32px; }
    .footer a { color: #ccc; }
    .footer-bottom { border-top: 1px solid #3A4547; margin-top: 36px; padding-top: 20px; text-align: center; font-size: 14px; }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
      .features-grid, .services-grid, .stats-grid { grid-template-columns: 1fr; }
    }