/* roulang page: index */
:root {
      --primary: #0A6E79;
      --primary-dark: #085F69;
      --primary-glow: rgba(10, 110, 121, 0.15);
      --accent: #F5A623;
      --accent-dark: #E09515;
      --bg: #F8FAFC;
      --surface: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --border: #E2E8F0;
      --radius: 16px;
      --radius-sm: 12px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-card-hover: 0 12px 32px rgba(10,110,121,0.08);
      --footer-bg: #0C4A52;
      --hero-gradient: linear-gradient(180deg, #F8FAFC 0%, #E6F0F2 100%);
      --transition: 0.3s ease;
      --nav-height: 72px;
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, textarea { font-family: inherit; }
    .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

    /* 导航 */
    .header {
      position: fixed; top: 0; left: 0; width: 100%; height: var(--nav-height);
      background: rgba(255,255,255,0.92); backdrop-filter: blur(12px);
      z-index: 1000; border-bottom: 1px solid rgba(0,0,0,0.03);
      transition: box-shadow var(--transition);
    }
    .header.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.04); }
    .nav {
      display: flex; align-items: center; justify-content: space-between;
      height: 100%; max-width: 1280px; margin: 0 auto; padding: 0 24px;
    }
    .logo {
      font-size: 24px; font-weight: 700; letter-spacing: 1px;
      display: flex; align-items: center; gap: 8px; color: var(--primary);
    }
    .logo-icon {
      width: 32px; height: 32px; background: var(--primary);
      border-radius: 50%; display: flex; align-items: center; justify-content: center;
      color: white; font-size: 16px; position: relative;
    }
    .logo-icon::after {
      content: ''; position: absolute; width: 18px; height: 18px;
      border: 2px solid white; border-radius: 50%; top: 4px; left: 4px;
      border-top-color: transparent; border-right-color: transparent;
      transform: rotate(-45deg);
    }
    .nav-links { display: flex; align-items: center; gap: 32px; }
    .nav-links a {
      font-size: 15px; font-weight: 500; color: var(--text-secondary);
      position: relative; padding: 8px 0; transition: color var(--transition);
    }
    .nav-links a:hover, .nav-links a.active { color: var(--primary); }
    .nav-links a::after {
      content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
      background: var(--primary); transition: width var(--transition);
    }
    .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
    .burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; z-index: 1001; }
    .burger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }
    .mobile-menu {
      position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
      background: white; z-index: 999; display: none; flex-direction: column;
      align-items: center; justify-content: center; gap: 32px; font-size: 22px;
    }
    .mobile-menu.active { display: flex; }
    .mobile-menu a { color: var(--text); font-weight: 600; }

    /* Hero */
    .hero {
      padding: 120px 0 80px; background: var(--hero-gradient);
      display: flex; align-items: center; min-height: 90vh;
    }
    .hero-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
    }
    .hero-content h1 {
      font-size: 48px; line-height: 1.2; font-weight: 700; margin-bottom: 20px;
      color: var(--text);
    }
    .hero-content h1 span { color: var(--primary); }
    .hero-content p {
      font-size: 18px; color: var(--text-secondary); margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-buttons { display: flex; gap: 20px; flex-wrap: wrap; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      padding: 14px 32px; border-radius: var(--radius-sm); font-weight: 600;
      font-size: 16px; transition: var(--transition); cursor: pointer;
      border: 2px solid transparent; text-align: center;
    }
    .btn-primary { background: var(--primary); color: white; }
    .btn-primary:hover { background: var(--primary-dark); box-shadow: 0 0 0 4px var(--primary-glow); transform: translateY(-2px); }
    .btn-secondary { background: transparent; border-color: var(--primary); color: var(--primary); }
    .btn-secondary:hover { background: rgba(10,110,121,0.05); transform: translateY(-2px); }
    .btn-cta { background: var(--accent); color: white; border-color: var(--accent); padding: 16px 40px; font-size: 18px; }
    .btn-cta:hover { background: var(--accent-dark); box-shadow: 0 8px 20px rgba(245,166,35,0.3); transform: translateY(-3px); }
    .hero-visual {
      display: flex; align-items: center; justify-content: center;
      position: relative;
    }
    .hero-geo {
      width: 360px; height: 360px; border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, rgba(10,110,121,0.08), rgba(245,166,35,0.06));
      display: flex; align-items: center; justify-content: center;
      position: relative;
    }
    .hero-geo::before {
      content: ''; position: absolute; width: 80%; height: 80%;
      border: 3px dashed var(--primary); border-radius: 50%; opacity: 0.3;
      animation: spin 20s linear infinite;
    }
    .hero-geo::after {
      content: ''; width: 140px; height: 140px; background: var(--accent);
      border-radius: 50%; opacity: 0.7; filter: blur(40px);
      position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
    }
    @keyframes spin { 100% { transform: rotate(360deg); } }
    .scroll-indicator {
      position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
      font-size: 28px; color: var(--primary); animation: bounce 2s infinite;
    }
    @keyframes bounce { 0%,100%{transform:translateY(0);} 50%{transform:translateY(8px);} }

    /* 板块通用 */
    .section { padding: 80px 0; }
    .section-title {
      font-size: 36px; font-weight: 700; text-align: center; margin-bottom: 16px;
      color: var(--text);
    }
    .section-subtitle {
      text-align: center; color: var(--text-secondary); margin-bottom: 48px;
      font-size: 18px;
    }

    /* 数据看板 */
    #dashboard { background: white; }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    .stat-card {
      background: var(--surface); border-radius: var(--radius); padding: 32px 24px;
      box-shadow: var(--shadow-card); text-align: center;
      border-bottom: 4px solid transparent;
      background-image: linear-gradient(white, white), linear-gradient(135deg, var(--primary), var(--accent));
      background-origin: border-box; background-clip: padding-box, border-box;
      transition: var(--transition);
    }
    .stat-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); }
    .stat-number { font-size: 42px; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
    .stat-label { color: var(--text-secondary); font-size: 15px; }

    /* 服务矩阵 */
    .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
    .service-card {
      background: var(--surface); border-radius: var(--radius); padding: 40px 28px;
      box-shadow: var(--shadow-card); transition: var(--transition);
      display: flex; flex-direction: column;
    }
    .service-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); }
    .service-icon { font-size: 36px; color: var(--accent); margin-bottom: 20px; }
    .service-card h3 { font-size: 22px; margin-bottom: 12px; color: var(--text); }
    .service-card p { color: var(--text-secondary); line-height: 1.7; }
    .service-list { list-style: none; padding: 0; }
    .service-list li { padding: 8px 0; color: var(--text-secondary); display: flex; align-items: center; gap: 8px; }
    .service-list li::before { content: '✓'; color: var(--accent); font-weight: bold; }
    .service-image-card {
      display: flex; flex-direction: column; gap: 20px;
    }
    .service-image-card img {
      width: 100%; border-radius: var(--radius); object-fit: cover; height: 200px;
    }

    /* 对比 */
    .compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; max-width: 900px; margin: 0 auto; }
    .compare-col {
      background: white; border-radius: var(--radius); padding: 40px 28px;
      box-shadow: var(--shadow-card);
    }
    .compare-col.left { border: 1px solid var(--border); opacity: 0.85; }
    .compare-col.right { border: 2px solid var(--primary); background: #F0FDF9; }
    .compare-col h3 { font-size: 22px; margin-bottom: 24px; text-align: center; }
    .compare-item { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border); }
    .compare-item:last-child { border-bottom: none; }
    .icon-check { color: var(--primary); font-weight: bold; }
    .icon-cross { color: #CBD5E1; }

    /* FAQ */
    .faq-list { max-width: 800px; margin: 0 auto; }
    .faq-item {
      border-bottom: 1px solid var(--border); padding: 16px 0;
      cursor: pointer; position: relative;
    }
    .faq-question {
      font-size: 18px; font-weight: 600; display: flex; align-items: center;
      gap: 16px; color: var(--text);
    }
    .faq-question::before {
      content: ''; width: 4px; height: 24px; background: var(--accent);
      border-radius: 2px; flex-shrink: 0;
    }
    .faq-answer {
      max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-secondary); padding-left: 24px;
    }
    .faq-item.active .faq-answer { max-height: 200px; padding-top: 12px; }
    .faq-item.active { background: #F0F8F9; border-radius: 8px; padding: 16px; }

    /* 表单 */
    .contact-card {
      background: white; max-width: 580px; margin: 0 auto; padding: 48px 40px;
      border-radius: var(--radius); box-shadow: var(--shadow-card);
    }
    .form-group { margin-bottom: 24px; }
    .form-group label { display: block; margin-bottom: 8px; font-weight: 500; }
    .form-group input, .form-group textarea {
      width: 100%; padding: 14px 16px; border: 1px solid var(--border);
      border-radius: var(--radius-sm); font-size: 16px; transition: var(--transition);
    }
    .form-group input:focus, .form-group textarea:focus {
      outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(10,110,121,0.1);
    }
    .trust-badges { display: flex; gap: 24px; justify-content: center; margin-top: 16px; color: var(--text-secondary); font-size: 14px; }

    /* 页脚 */
    .footer {
      background: var(--footer-bg); color: rgba(255,255,255,0.85); padding: 64px 0 32px;
    }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
    .footer h4 { color: white; margin-bottom: 16px; font-size: 16px; }
    .footer p, .footer a { font-size: 14px; color: rgba(255,255,255,0.7); line-height: 2; display: block; }
    .footer a:hover { color: var(--accent); }
    .copyright { text-align: center; margin-top: 40px; font-size: 14px; color: rgba(255,255,255,0.5); }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { order: -1; }
      .hero-geo { width: 260px; height: 260px; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .burger { display: flex; }
      .stats-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-content h1 { font-size: 36px; }
      .section { padding: 60px 0; }
    }
    @media (max-width: 520px) {
      .container { padding: 0 16px; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-buttons { flex-direction: column; align-items: center; }
    }