/* roulang page: index */
:root {
      --primary-blue: #0A66C2;
      --primary-blue-hover: #084d8a;
      --accent-orange: #F15A24;
      --bg-light: #F7F9FC;
      --white: #ffffff;
      --text-dark: #1E2A3A;
      --text-secondary: #5A6B7F;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(10,102,194,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: var(--primary-blue);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-blue-hover);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏定制 */
    .foundation-topbar {
      background: var(--white) !important;
      padding: 0.75rem 0;
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: box-shadow 0.3s ease;
    }
    .foundation-topbar.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .top-bar, .top-bar ul {
      background: transparent;
    }
    .top-bar .menu li a {
      color: var(--text-dark);
      font-weight: 500;
      font-size: 1rem;
      padding: 0.5rem 1rem;
      transition: var(--transition);
      border-bottom: 2px solid transparent;
    }
    .top-bar .menu li a:hover {
      color: var(--primary-blue);
      background: transparent;
    }
    .top-bar .menu li.active a {
      font-weight: 700;
      color: var(--primary-blue);
      border-bottom: 2px solid var(--primary-blue);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-text i {
      color: var(--accent-orange);
      font-size: 1.8rem;
    }
    .menu-icon::after {
      background: var(--text-dark);
    }
    /* 汉堡菜单背景 */
    .top-bar .menu-icon {
      background: transparent;
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #f0f4fc 0%, #e9f0fa 100%);
      position: relative;
      overflow: hidden;
      padding: 80px 0;
    }
    #hero::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 10% 20%, rgba(10,102,194,0.03) 0%, transparent 30%);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 40%;
    }
    .hero-right img {
      border-radius: 20px;
      box-shadow: 0 25px 45px rgba(0,0,0,0.1);
      width: 100%;
      height: auto;
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.2rem;
      color: var(--text-dark);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-blue);
      color: white;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: var(--transition);
      display: inline-block;
      box-shadow: 0 8px 18px rgba(10,102,194,0.2);
      cursor: pointer;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-blue-hover);
      transform: translateY(-2px);
      color: white;
      box-shadow: 0 12px 24px rgba(10,102,194,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(10,102,194,0.05);
      color: var(--primary-blue-hover);
      border-color: var(--primary-blue-hover);
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      color: var(--text-dark);
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }
    /* 亮点卡片 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
    }
    .highlight-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .highlight-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      background: rgba(241,90,36,0.1);
      width: 64px;
      height: 64px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--accent-orange);
      font-size: 2rem;
    }
    .highlight-card h3 {
      color: var(--primary-blue);
      font-weight: 700;
      margin-bottom: 0.8rem;
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img-wrap {
      position: relative;
      overflow: hidden;
      aspect-ratio: 16 / 9;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: #EBF3FA;
      color: var(--primary-blue);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* 方案对比 */
    .compare-table {
      display: flex;
      gap: 0;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-col {
      flex: 1;
      background: white;
    }
    .compare-header {
      background: var(--primary-blue);
      color: white;
      padding: 20px;
      font-weight: 700;
      font-size: 1.2rem;
      text-align: center;
    }
    .compare-row {
      display: flex;
      border-bottom: 1px solid var(--border-light);
    }
    .compare-cell {
      flex: 1;
      padding: 16px 20px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .highlight-col {
      background: #EBF3FA;
    }
    .green-check {
      color: #2EAD6F;
    }
    .gray-cross {
      color: #C0C8D4;
    }
    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    .accordion-title {
      font-weight: 600;
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--text-dark);
      transition: background 0.2s;
    }
    .accordion-title:hover {
      background: #f4f9ff;
    }
    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    .accordion-item.active .accordion-title {
      border-left: 4px solid var(--primary-blue);
    }
    /* 联系CTA */
    #contact {
      background: #1A2535;
      color: white;
    }
    .contact-grid {
      display: flex;
      gap: 50px;
      flex-wrap: wrap;
    }
    .contact-left p {
      color: #B0BEC5;
    }
    .contact-form input, .contact-form textarea {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 8px;
      color: white;
      padding: 14px;
      margin-bottom: 16px;
      width: 100%;
      transition: 0.2s;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--primary-blue);
      outline: none;
      box-shadow: 0 0 0 3px rgba(10,102,194,0.3);
    }
    .footer {
      background: #0f1a2b;
      color: #B0BEC5;
      padding: 50px 0 20px;
    }
    .footer a {
      color: #B0BEC5;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .compare-table {
        flex-direction: column;
      }
      .btn-group {
        justify-content: center;
      }
      h1 {
        font-size: 2.2rem;
      }
    }