/* roulang page: index */
:root {
      --brand-slate: #1E293B;
      --brand-copper: #C27803;
      --brand-emerald: #059669;
      --brand-bg: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: #F8FAFC;
      color: #1E293B;
      line-height: 1.75;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.96) 0%, rgba(30, 41, 59, 0.94) 100%), url('/assets/images/1cca56cefd8bd194.webp') center/cover no-repeat;
    }
    .tech-bg {
      background: linear-gradient(180deg, rgba(15, 23, 42, 0.98) 0%, rgba(30, 41, 59, 0.97) 100%), url('/assets/images/5e29d39d06ec72c5.webp') center/cover no-repeat;
    }
    .chip-card {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .chip-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -10px rgba(15, 23, 42, 0.12);
      border-color: #C27803;
    }
    .copper-glow {
      box-shadow: 0 0 25px -5px rgba(194, 120, 3, 0.3);
    }
    /* 环形倒计时进度视觉 */
    .circle-timer {
      background: conic-gradient(#C27803 0deg 280deg, #334155 280deg 360deg);
    }
    .code-tag {
      font-family: 'JetBrains Mono', monospace;
    }