/* roulang page: index */
:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --secondary: #06b6d4;
      --accent: #f43f5e;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-soft: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 16px 32px -4px rgba(79, 70, 229, 0.12);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: #ffffff;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .custom-scroll::-webkit-scrollbar {
      height: 6px;
      width: 6px;
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background: #cbd5e1;
      border-radius: 9999px;
    }
    .card-transition {
      transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .details-animated[open] summary ~ * {
      animation: sweep .3s ease-in-out;
    }
    @keyframes sweep {
      0% {opacity: 0; transform: translateY(-8px);}
      100% {opacity: 1; transform: translateY(0);}
    }
    .bg-hero-pattern {
      background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 45%);
    }