/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary-deep: #0F172A;
      --accent-cyan: #06B6D4;
      --cta-orange: #F97316;
      --bg-light: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-weak: #64748B;
      --border-light: #E2E8F0;
      --shadow-card: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-hover: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
      --radius-xl: 1rem;
      --radius-2xl: 1.25rem;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background-color: var(--bg-light);
      color: #1E293B;
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    .container-responsive {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 768px) {
      .container-responsive {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    /* 卡片化导航面板 */
    .nav-panel {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-2xl);
      box-shadow: var(--shadow-card);
    }
    .nav-item-card {
      transition: all 0.25s ease;
      border-radius: 1rem;
      padding: 0.5rem 1rem;
      color: #334155;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      background: transparent;
    }
    .nav-item-card:hover {
      background: #E0F2FE;
      color: #0F172A;
      transform: translateY(-1px);
    }
    .nav-item-card i {
      color: var(--accent-cyan);
      font-size: 1.1rem;
    }
    /* 按钮系统 */
    .btn-primary {
      background-color: var(--accent-cyan);
      color: white;
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: 1rem;
      box-shadow: 0 8px 16px -6px rgba(6,182,212,0.3);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: #0891B2;
      box-shadow: 0 12px 20px -8px rgba(6,182,212,0.4);
      transform: translateY(-2px);
    }
    .btn-cta {
      background-color: var(--cta-orange);
      color: white;
      font-weight: 700;
      padding: 1rem 2.5rem;
      border-radius: 1rem;
      box-shadow: 0 10px 18px -8px rgba(249,115,22,0.4);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      font-size: 1.125rem;
    }
    .btn-cta:hover {
      background-color: #EA580C;
      box-shadow: 0 14px 22px -8px rgba(249,115,22,0.5);
      transform: scale(1.02);
    }
    .btn-outline {
      background: white;
      border: 2px solid #CBD5E1;
      color: #1E293B;
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: 1rem;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      border-color: var(--accent-cyan);
      color: #0F172A;
      background: #F0F9FF;
    }
    /* 卡片通用 */
    .feature-card, .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-2xl);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
      overflow: hidden;
    }
    .feature-card:hover, .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }
    /* Hero 视频窗口模拟 */
    .video-mock {
      background: #0F172A;
      border-radius: 1.5rem;
      box-shadow: 0 25px 40px -15px rgba(15,23,42,0.4);
      position: relative;
      overflow: hidden;
      aspect-ratio: 16 / 10;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border: 2px solid rgba(255,255,255,0.1);
    }
    .play-btn {
      position: absolute;
      top: 50%; left: 50%;
      transform: translate(-50%, -50%);
      background: rgba(255,255,255,0.9);
      width: 64px; height: 64px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      font-size: 2rem;
      box-shadow: 0 8px 20px rgba(0,0,0,0.4);
      transition: 0.2s;
    }
    .play-btn:hover {
      background: white;
      color: #0891B2;
      transform: translate(-50%, -50%) scale(1.08);
    }
    /* 对比表 */
    .compare-left {
      background: #F1F5F9;
      border-radius: 1.5rem;
    }
    .compare-right {
      background: #E0F2FE;
      border-radius: 1.5rem;
    }
    /* FAQ 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 1rem;
    }
    /* 瀑布流 */ 
    .masonry {
      column-gap: 1.5rem;
    }
    @media (min-width: 768px) {
      .masonry {
        columns: 2;
      }
    }
    @media (min-width: 1024px) {
      .masonry {
        columns: 3;
      }
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.5rem;
    }
    /* 装饰信号波纹 */
    .signal-dot {
      width: 8px; height: 8px;
      background: var(--accent-cyan);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 0 4px rgba(6,182,212,0.2);
      margin-right: 0.5rem;
    }