/* roulang page: index */
:root {
      --primary-deep: #0A1F3F;
      --accent-cyan: #00C2FF;
      --cta-orange: #FF6B35;
      --bg-light: #F4F7FC;
      --bg-white: #FFFFFF;
      --text-body: #4A5568;
      --text-muted: #718096;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(10,31,63,0.06);
      --shadow-hover: 0 8px 30px rgba(10,31,63,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
      --nav-height: 64px;
      --section-gap: 100px;
      --card-padding: 28px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--accent-cyan);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 SaaS 命令栏风格 */
    .navbar-custom {
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
      padding: 0 24px;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1030;
      border-bottom: 1px solid transparent;
    }
    .nav-brand {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
      white-space: nowrap;
      text-decoration: none;
    }
    .nav-brand span {
      color: var(--accent-cyan);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      margin-left: 48px;
      list-style: none;
      margin-bottom: 0;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--primary-deep);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-actions {
      margin-left: auto;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-box {
      background: var(--bg-light);
      border-radius: var(--radius-pill);
      padding: 6px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 120px;
    }
    .icon-btn {
      color: var(--primary-deep);
      font-size: 18px;
      cursor: pointer;
      transition: color 0.2s;
    }
    .icon-btn:hover {
      color: var(--accent-cyan);
    }
    .btn-cta-sm {
      background: var(--accent-cyan);
      color: white;
      border: none;
      padding: 8px 18px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 14px;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .btn-cta-sm:hover {
      background: #009FD4;
      box-shadow: 0 4px 12px rgba(0,194,255,0.3);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary-deep);
    }
    /* Hero 双栏杂志式 */
    .hero-section {
      padding: calc(var(--nav-height) + 60px) 0 80px;
      background: var(--bg-white);
    }
    .hero-left h1 {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .hero-left .subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary-custom {
      background: var(--accent-cyan);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-primary-custom:hover {
      background: #009FD4;
      box-shadow: 0 8px 18px rgba(0,194,255,0.25);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-outline-custom:hover {
      background: var(--primary-deep);
      color: white;
    }
    .trust-badge {
      margin-top: 28px;
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--text-muted);
      font-size: 13px;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      object-fit: cover;
    }
    /* 通用区块 */
    .section-padding {
      padding: var(--section-gap) 0;
    }
    .bg-light-gray {
      background: var(--bg-light);
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 16px;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 17px;
      margin-bottom: 48px;
    }
    /* 亮点网格卡片 */
    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 8px;
    }
    /* 案例瀑布流卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: box-shadow 0.2s;
      height: 100%;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img-wrap {
      position: relative;
    }
    .case-img-wrap img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-tag {
      position: absolute;
      bottom: 12px;
      left: 12px;
      background: rgba(10,31,63,0.8);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
    }
    .case-body {
      padding: 20px;
    }
    .case-body h3 {
      font-size: 18px;
      font-weight: 600;
      color: var(--primary-deep);
    }
    .case-stat {
      color: var(--accent-cyan);
      font-weight: 600;
      margin-top: 8px;
    }
    /* 方案对比卡片 */
    .plan-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      transition: all 0.2s;
      height: 100%;
    }
    .plan-highlight {
      border: 2px solid var(--accent-cyan);
      position: relative;
    }
    .plan-badge {
      background: var(--accent-cyan);
      color: white;
      font-size: 13px;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }
    .plan-price {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-deep);
      margin: 16px 0;
    }
    .feature-list {
      list-style: none;
      text-align: left;
      margin-top: 24px;
    }
    .feature-list li {
      padding: 6px 0;
      font-size: 14px;
      color: var(--text-body);
    }
    /* FAQ 手风琴自定义 */
    .accordion-button {
      font-weight: 600;
      color: var(--primary-deep);
      background: white;
      box-shadow: none;
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .accordion-button:not(.collapsed) {
      color: var(--accent-cyan);
      background: transparent;
      box-shadow: none;
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-body {
      background: #F9FAFB;
      padding: 16px 0;
      color: var(--text-body);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0A1F3F 0%, #0D2B56 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .btn-cta-large {
      background: var(--cta-orange);
      border: none;
      color: white;
      padding: 14px 40px;
      border-radius: var(--radius-btn);
      font-size: 18px;
      font-weight: 600;
      transition: background 0.2s;
      margin-top: 24px;
    }
    .btn-cta-large:hover {
      background: #e55a2b;
    }
    /* 页脚 */
    .footer-custom {
      background: var(--primary-deep);
      color: #CBD5E0;
      padding: 60px 0 30px;
    }
    .footer-links a {
      color: #CBD5E0;
      display: block;
      margin-bottom: 8px;
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      cursor: pointer;
    }
    @media (max-width: 992px) {
      .nav-links, .search-box {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .hero-left h1 {
        font-size: 32px;
      }
    }
    @media (max-width: 768px) {
      .hero-section .row {
        flex-direction: column-reverse;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
    }