/* roulang page: index */
:root {
      --brand-primary: #1d4ed8;
      --brand-hover: #1e40af;
      --accent-cyan: #0ea5e9;
      --accent-emerald: #10b981;
      --bg-slate: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: #ffffff;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    .video-hero-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(29, 78, 216, 0.78) 100%);
    }
    .spec-table th, .spec-table td {
      border-bottom: 1px solid #e2e8f0;
      padding: 1rem 1.25rem;
      text-align: left;
    }
    .spec-table tr:hover td {
      background-color: #f8fafc;
    }
    details summary::-webkit-details-marker {
      display: none;
    }