/* roulang page: index */
:root {
      --primary: #0A6E6E;
      --primary-hover: #085858;
      --primary-light: rgba(10, 110, 110, 0.08);
      --accent: #F4A340;
      --accent-light: rgba(244, 163, 64, 0.12);
      --dark-bg: #1E3B4A;
      --text-body: #2C3E50;
      --text-muted: #5A6F7C;
      --bg-page: #F7F9FC;
      --card-white: #FFFFFF;
      --border-light: #E9EDF2;
      --border-input: #DCE3E9;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Segoe UI", system-ui, sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --max-width: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

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

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--card-white);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      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%;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-body);
      cursor: pointer;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 1rem;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      border-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }

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

    .btn-accent {
      background: var(--accent);
      color: #1E3B4A;
      border-color: var(--accent);
    }
    .btn-accent:hover {
      background: #e5942e;
      border-color: #e5942e;
      transform: translateY(-2px);
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap var(--transition);
    }
    .text-link i {
      transition: transform var(--transition);
    }
    .text-link:hover i {
      transform: translateX(4px);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-body);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    /* Hero */
    .hero {
      padding: 80px 0 100px;
      background: linear-gradient(135deg, #F7F9FC 0%, #FFFFFF 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: var(--dark-bg);
    }
    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      height: 400px;
      box-shadow: var(--shadow-md);
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
      margin: 8px 0;
    }
    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .card-body {
      padding: 24px;
    }
    .card-body h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }

    /* 对比 */
    .comparison-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }
    .compare-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      border: 2px solid transparent;
    }
    .compare-card.highlight {
      border-color: var(--primary);
      background: #F0F7F7;
    }
    .compare-card h3 {
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      margin-bottom: 1rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--border-light);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.1rem;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 350px;
      gap: 40px;
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 48px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 500;
    }
    .form-control {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-btn);
      transition: border var(--transition);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--primary-light);
    }
    .trust-badge {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: #CBD5E0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .hero-grid, .services-grid, .comparison-container {
        grid-template-columns: 1fr;
      }
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 2.2rem !important;
      }
    }