/* roulang page: index */
:root {
      --primary: #111827;
      --accent: #6366f1;
      --accent-hover: #4f46e5;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --bg-dark: #0f1115;
      --text-main: #090a0c;
      --text-muted: #4a5568;
      --border-color: #e2e8f0;
      --border-dark: #22262f;
      --radius-base: 14px;
      --transition-base: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    .clip-hero-diagonal {
      clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
    }
    .badge-glow {
      box-shadow: 0 0 16px rgba(99, 102, 241, 0.35);
    }
    .card-hover-effect {
      transition: var(--transition-base);
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 30px -10px rgba(0, 0, 0, 0.08);
      border-color: #c7d2fe;
    }
    .sticky-top-anchor {
      position: sticky;
      top: 96px;
    }
    details summary::-webkit-details-marker {
      display: none;
    }