/* roulang page: index */
:root {
      --primary: #1A2540;
      --accent: #00C2A8;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --bg: #F5F6FA;
      --card: #FFFFFF;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --text-inverse: #FFFFFF;
      --border-light: #E5E6EB;
      --shadow-sm: 0 2px 12px rgba(26, 37, 64, 0.06);
      --shadow-md: 0 8px 24px rgba(26, 37, 64, 0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 24px;
      --gap-section: 100px;
      --max-width: 1200px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.2s ease-out;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      background-color: var(--bg);
    }

    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all var(--transition);
      font-weight: 500;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: all 0.25s ease;
    }

    .header.scrolled {
      background: rgba(255, 255, 255, 0.96);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: conic-gradient(from 180deg at 50% 50%, var(--accent) 0deg, var(--primary) 180deg, var(--accent) 360deg);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.2rem;
      position: relative;
      overflow: hidden;
    }

    .logo-icon::after {
      content: "✦";
      font-size: 1.2rem;
      color: white;
      filter: drop-shadow(0 0 4px rgba(255,255,255,0.6));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 8px 0;
      white-space: nowrap;
    }

    .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%;
    }

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

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-primary);
    }

    /* 板块通用 */
    .section {
      padding: var(--gap-section) 0;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    .section-sub {
      font-size: 1rem;
      color: var(--text-secondary);
      max-width: 680px;
      margin-bottom: 48px;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(26,37,64,0.15);
    }
    .btn-primary:hover {
      background: #0f1a30;
      box-shadow: 0 8px 18px rgba(26,37,64,0.25);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 700;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 700;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      background: radial-gradient(circle at 50% 0%, rgba(0,194,168,0.06) 0%, transparent 70%);
    }
    .hero-left {
      flex: 1;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 1.125rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .data-cards {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .data-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      flex: 1 1 130px;
      display: flex;
      flex-direction: column;
    }
    .data-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
    }
    .data-label {
      font-size: 0.85rem;
      color: var(--text-secondary);
    }

    /* 指标看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-item {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 28px 16px;
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-secondary);
    }

    /* 服务网格 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .service-icon {
      font-size: 28px;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 1.25rem;
      margin-bottom: 8px;
    }

    /* 对比区块 */
    .compare-row {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-col.left {
      background: #f2f2f5;
    }
    .compare-col.right {
      background: rgba(26,37,64,0.03);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 14px 0;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      border: 2px solid var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 12px;
    }

    /* FAQ */
    .faq-item {
      background: var(--card);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }

    /* CTA 区块 */
    .cta-block {
      background: var(--primary);
      border-radius: var(--radius-card);
      padding: 80px 40px;
      text-align: center;
      color: white;
      margin: 60px 0;
    }

    /* 页脚 */
    .footer {
      background: #1F2329;
      color: #86909C;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero { flex-direction: column; padding: 100px 0 60px; }
      .section-title { font-size: 1.8rem; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .steps { flex-direction: column; gap: 24px; }
    }