/* roulang page: index */
:root {
      --primary: #0052D9;
      --accent: #00C58E;
      --bg-dark: #0A101D;
      --bg-light: #F4F7FA;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --brand-gradient: linear-gradient(135deg, #0052D9 0%, #00C58E 100%);
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      overflow-x: hidden;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-body);
      background-color: #FFFFFF;
      line-height: 1.75;
      letter-spacing: 0.02em;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      line-height: 1.3;
    }

    .brand-gradient-text {
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .brand-gradient-bg {
      background: var(--brand-gradient);
    }

    .bento-card {
      background: #FFFFFF;
      border: 1px solid rgba(226, 232, 240, 0.85);
      border-radius: 1.25rem;
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .bento-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -4px rgba(0, 82, 217, 0.12);
      border-color: rgba(0, 82, 217, 0.3);
    }

    .dark-panel {
      background-color: var(--bg-dark);
      background-image: radial-gradient(rgba(0, 82, 217, 0.15) 1px, transparent 1px);
      background-size: 24px 24px;
    }

    .glass-nav {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    details summary::-webkit-details-marker {
      display: none;
    }