/* roulang page: index */
:root {
      --primary: #E60012;
      --primary-dark: #c2000f;
      --secondary: #0A2342;
      --accent-gold: #FFB800;
      --accent-green: #00C9A7;
      --bg: #FAFAFA;
      --white: #FFFFFF;
      --text: #1E1E1E;
      --text-soft: #5A5A5A;
      --border-light: #E5E7EB;
      --radius-md: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px rgba(230,0,18,0.12);
      --transition: all 0.2s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Noto Sans SC', 'Roboto', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      backdrop-filter: blur(10px);
      background: rgba(255,255,255,0.85);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: var(--transition);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }

    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text);
    }

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

    .btn-primary-sm {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      box-shadow: 0 4px 10px rgba(230,0,18,0.25);
    }

    .btn-primary-sm:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(230,0,18,0.3);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--secondary);
      cursor: pointer;
    }

    /* 英雄区 */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      color: var(--secondary);
      margin-bottom: 1.5rem;
    }

    .hero-title span {
      color: var(--primary);
      position: relative;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 2rem;
    }

    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 6px 16px rgba(230,0,18,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      transition: var(--transition);
    }

    .btn-ghost:hover {
      background: rgba(230,0,18,0.05);
    }

    .trust-badge {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      margin-top: 2rem;
      color: var(--text-soft);
      font-size: 0.9rem;
    }

    .hero-image img {
      border-radius: 20px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
    }

    /* 通用版块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--secondary);
      text-align: center;
      margin-bottom: 1rem;
    }

    .section-sub {
      color: var(--text-soft);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }

    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
    }

    .feature-card {
      background: var(--white);
      padding: 2rem 1.5rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .service-item {
      background: var(--white);
      padding: 1.8rem;
      border-radius: var(--radius-md);
      display: flex;
      gap: 1.2rem;
      align-items: flex-start;
      box-shadow: var(--shadow-card);
    }

    .stats-band {
      background: #fef2f2;
      border-radius: 20px;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      padding: 2.5rem 1rem;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
    }

    .steps-vertical {
      display: flex;
      flex-direction: column;
      gap: 2rem;
      max-width: 800px;
      margin: 0 auto;
    }

    .step-card {
      background: white;
      padding: 1.8rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 1.5rem;
    }

    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }

    .compare-col {
      background: white;
      border-radius: var(--radius-md);
      padding: 2rem 1.2rem;
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .compare-col.highlight {
      border: 2px solid var(--primary);
      transform: scale(1.02);
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 1.8rem 1.5rem;
      color: var(--text-soft);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .cta-banner {
      background: linear-gradient(135deg, #E60012 0%, #b0000f 100%);
      border-radius: 24px;
      padding: 3rem;
      text-align: center;
      color: white;
    }

    footer {
      background: var(--secondary);
      color: #ddd;
      padding: 4rem 0 2rem;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .compare-table {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }