/* roulang page: index */
:root {
      --primary: #6C3CF0;
      --primary-dark: #5A2BD0;
      --secondary: #FF6B2B;
      --secondary-dark: #E55A1C;
      --bg-light: #F9F8FD;
      --bg-white: #FFFFFF;
      --bg-dark: #1E1836;
      --text-heading: #1A1333;
      --text-body: #4A4460;
      --text-muted: #8B85A0;
      --text-light: #B5AFC8;
      --border-light: #E8E4F0;
      --border-input: #D4D0E0;
      --success: #10B981;
      --danger: #EF4444;
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-pill: 32px;
      --shadow-sm: 0 2px 8px rgba(108,60,240,0.06);
      --shadow-hover: 0 8px 24px rgba(108,60,240,0.12);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 700;
    }

    h1 { font-size: 40px; line-height: 1.2; }
    h2 { font-size: 32px; line-height: 1.3; }
    h3 { font-size: 22px; line-height: 1.4; font-weight: 600; }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: var(--primary-dark);
    }

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

    button, .button {
      cursor: pointer;
      font-family: var(--font-sans);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    #main-nav {
      background: var(--bg-white);
      height: 72px;
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 50;
    }

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

    .logo-brand {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    .logo-brand i {
      font-size: 32px;
      color: var(--secondary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 16px;
      color: var(--text-body);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }
    .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,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-box {
      background: #F3F1F8;
      border-radius: 24px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-muted);
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 120px;
    }

    .btn-orange {
      background: var(--secondary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: 24px;
      font-weight: 600;
      font-size: 16px;
      transition: background var(--transition), transform 0.2s;
    }
    .btn-orange:hover {
      background: var(--secondary-dark);
      transform: translateY(-1px);
    }

    .mobile-toggle {
      display: none;
      font-size: 28px;
      color: var(--primary);
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, rgba(108,60,240,0.85) 0%, rgba(30,24,54,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-content {
      max-width: 600px;
    }
    .hero-content h1 {
      color: white;
      font-size: 48px;
      margin-bottom: 20px;
    }
    .hero-content p {
      font-size: 20px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
      line-height: 1.8;
    }
    .btn-hero {
      background: var(--secondary);
      color: white;
      padding: 16px 40px;
      border-radius: 32px;
      font-size: 18px;
      font-weight: 600;
      border: none;
      transition: all 0.3s;
      display: inline-block;
    }
    .btn-hero:hover {
      background: #ff7a40;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255,107,43,0.4);
    }
    .hero-link {
      color: rgba(255,255,255,0.8);
      margin-left: 24px;
      font-weight: 500;
    }

    /* 指标看板 */
    #metrics {
      padding: 80px 0;
      background: #F3F1F8;
    }
    .metrics-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
    }
    .metric-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      flex: 1 1 200px;
      min-width: 200px;
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .metric-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .metric-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.1;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 服务矩阵 */
    #services {
      padding: 80px 0;
      background: var(--bg-white);
    }
    .section-title {
      text-align: left;
      margin-bottom: 48px;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: flex-start;
      gap: 20px;
      transition: all 0.3s;
      border-bottom: 3px solid transparent;
    }
    .service-card:hover {
      border-bottom-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 40px;
      color: var(--primary);
    }
    .service-text h4 {
      margin-bottom: 8px;
    }
    .arrow-link {
      margin-left: auto;
      align-self: center;
      color: var(--primary);
      transition: transform 0.2s;
    }
    .service-card:hover .arrow-link {
      transform: translateX(4px);
    }

    /* 对比区块 */
    #compare {
      padding: 80px 0;
    }
    .compare-wrapper {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .compare-left, .compare-right {
      flex: 1;
      padding: 40px;
      border-radius: var(--radius-lg);
      list-style: none;
    }
    .compare-left {
      background: #F3F1F8;
      color: var(--text-body);
    }
    .compare-right {
      background: var(--bg-dark);
      color: white;
    }
    .compare-right h3 {
      color: var(--secondary);
    }
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .vs-badge {
      background: white;
      color: var(--primary);
      font-weight: 700;
      font-size: 20px;
      width: 60px;
      height: 60px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-sm);
    }

    /* FAQ */
    #faq {
      padding: 80px 0;
      background: var(--bg-white);
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      padding: 16px 0;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-heading);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-body);
    }
    .accordion-content.open {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* 联系表单 */
    #contact {
      padding: 80px 0;
      background: #F3F1F8;
    }
    .contact-grid {
      display: flex;
      gap: 48px;
      align-items: center;
    }
    .contact-left h2 {
      margin-bottom: 16px;
    }
    .form-group input {
      height: 48px;
      background: #F9F8FD;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-md);
      padding: 0 16px;
      width: 100%;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .form-group input:focus {
      border-color: var(--primary);
      outline: none;
    }
    .btn-submit {
      background: var(--secondary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      width: 100%;
      transition: background 0.3s;
    }
    .btn-submit:hover {
      background: var(--secondary-dark);
    }

    /* 页脚 */
    footer {
      background: var(--bg-dark);
      color: var(--text-light);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-wrapper { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-box { display: none; }
      .mobile-toggle { display: block; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .contact-grid { flex-direction: column; }
      h1 { font-size: 32px; }
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 20px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }
    .mobile-menu a {
      padding: 12px 0;
      border-bottom: 1px solid #eee;
    }