/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-dark: #115E59;
      --accent: #10B981;
      --warning: #F97316;
      --bg-base: #F8FAFC;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --card-border: rgba(226, 232, 240, 0.85);
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      line-height: 1.8;
      color: var(--text-body);
      background-color: var(--bg-base);
    }
    .video-hero-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 118, 110, 0.82) 100%);
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }