/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-light: rgba(26, 95, 122, 0.08);
      --secondary: #2D8B9C;
      --accent: #E9B824;
      --accent-hover: #D4A017;
      --bg: #F8FAFB;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --form-bg: #EDF2F7;
      --footer-bg: #1E293B;
      --footer-text: #CBD5E1;
      --footer-dark: #0F172A;
      --radius-sm: 8px;
      --radius: 12px;
      --radius-pill: 50px;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --transition: all 0.25s ease;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
      --section-gap: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      transition: var(--transition);
      font-family: var(--font-stack);
    }

    .container {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 16px;
      padding-right: 16px;
    }

    /* 自定义导航 */
    .navbar-top {
      background: #fff;
      height: 64px;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }
    .nav-brand {
      font-size: 28px;
      font-weight: 700;
      color: var(--text);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-brand i {
      color: var(--accent);
      font-size: 32px;
    }
    .search-icon {
      color: var(--text-muted);
      font-size: 20px;
      margin-right: 20px;
      cursor: pointer;
      transition: var(--transition);
    }
    .search-icon:hover {
      color: var(--primary);
    }
    .btn-cta-nav {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-sm);
      padding: 8px 20px;
      font-weight: 500;
      border: none;
    }
    .btn-cta-nav:hover {
      background: #134b5e;
      color: white;
    }

    .navbar-channels {
      background: #F8FAFB;
      height: 48px;
      display: flex;
      align-items: center;
      overflow-x: auto;
      white-space: nowrap;
      -ms-overflow-style: none;
      scrollbar-width: none;
      border-bottom: 1px solid rgba(0,0,0,0.02);
    }
    .navbar-channels::-webkit-scrollbar {
      display: none;
    }
    .channel-pill {
      display: inline-block;
      padding: 6px 18px;
      border-radius: var(--radius-pill);
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      background: transparent;
      margin: 0 4px;
      transition: var(--transition);
    }
    .channel-pill.active, .channel-pill:hover {
      background: var(--primary);
      color: white;
    }
    .channel-pill:not(.active):hover {
      background: #E2E8F0;
      color: var(--text);
    }

    @media (max-width: 768px) {
      .navbar-channels {
        justify-content: flex-start;
        padding-left: 8px;
      }
      .channel-pill {
        font-size: 14px;
        padding: 5px 14px;
      }
      .navbar-top {
        height: 56px;
      }
      :root {
        --section-gap: 60px;
      }
    }

    /* Hero */
    .hero-section {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 70vh;
      display: flex;
      align-items: center;
      position: relative;
      border-radius: 0 0 40px 40px;
      overflow: hidden;
    }
    .hero-overlay {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(6px);
      width: 100%;
      height: 100%;
      padding: 80px 0;
    }
    .hero-left h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--text);
      margin-bottom: 20px;
    }
    .hero-left h3 {
      font-size: 20px;
      font-weight: 400;
      color: var(--text-muted);
      margin-bottom: 30px;
    }
    .btn-accent {
      background: var(--accent);
      color: #1E293B;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-size: 18px;
      border: none;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      color: #1E293B;
    }
    .hero-image-preview {
      background: rgba(255,255,255,0.7);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      padding: 16px;
    }
    @media (max-width: 768px) {
      .hero-left h1 {
        font-size: 32px;
      }
      .hero-section {
        min-height: 500px;
      }
    }

    /* 通用区块标题 */
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text);
    }
    .section-desc {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 40px;
    }

    /* 数据看板 */
    .data-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
      border: none;
    }
    .data-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .data-label {
      font-size: 16px;
      color: var(--secondary);
      margin-bottom: 8px;
      font-weight: 500;
    }
    .data-number {
      font-size: 40px;
      font-weight: 800;
      font-feature-settings: "tnum";
      color: var(--text);
      line-height: 1.2;
      margin-bottom: 8px;
    }
    .data-unit {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 优势卡片 */
    .advantage-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: none;
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(45, 139, 156, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--secondary);
      font-size: 28px;
    }

    /* 业务卡片 */
    .biz-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: none;
    }
    .biz-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    /* 对比卡片 */
    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 32px;
      border: 1px solid var(--border);
    }
    .compare-card.xpj-mode {
      background: rgba(26, 95, 122, 0.04);
      border-color: var(--primary);
    }
    .compare-list i {
      margin-right: 8px;
      color: var(--secondary);
    }

    /* 案例卡片 */
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      position: relative;
    }
    .case-tag {
      position: absolute;
      bottom: 12px;
      left: 12px;
      background: var(--accent);
      color: #1E293B;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      color: var(--text);
      border-bottom: 1px solid var(--border);
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: #F8FAFB;
      color: var(--primary);
      border-left: 3px solid var(--primary);
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border);
    }

    /* 表单 */
    .form-section {
      background: var(--form-bg);
      border-radius: 16px;
      padding: 60px 40px;
    }
    .form-control {
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      height: 48px;
    }
    .form-control:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 0 3px rgba(45,139,156,0.15);
    }
    .btn-submit {
      background: var(--accent);
      color: #1E293B;
      font-weight: 600;
      border: none;
      height: 52px;
      border-radius: var(--radius-sm);
    }
    .btn-submit:hover {
      background: var(--accent-hover);
    }

    /* Footer */
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    .copyright {
      background: var(--footer-dark);
      color: #94A3B8;
    }

    @media (max-width: 768px) {
      .data-card, .advantage-card, .biz-card {
        margin-bottom: 20px;
      }
      .form-section {
        padding: 40px 20px;
      }
    }