/* roulang page: index */
:root {
      --primary: #0F2B5C;
      --secondary: #1A56DB;
      --accent: #00C6FF;
      --success: #10B981;
      --warning: #F59E0B;
      --bg-light: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --radius-card: 1.25rem;
      --shadow-soft: 0 4px 20px -2px rgba(15, 43, 92, 0.06);
      --shadow-hover: 0 16px 32px -4px rgba(26, 86, 219, 0.16);
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
    }
    .gradient-brand-btn {
      background: linear-gradient(135deg, #1A56DB 0%, #00C6FF 100%);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .gradient-brand-btn:hover {
      box-shadow: 0 10px 24px -4px rgba(0, 198, 255, 0.45);
      transform: translateY(-2px);
    }
    .gradient-brand-border {
      position: relative;
      background-clip: padding-box;
    }
    .gradient-brand-border::before {
      content: '';
      position: absolute;
      inset: 0;
      border-radius: inherit;
      padding: 1px;
      background: linear-gradient(135deg, rgba(26, 86, 219, 0.4), rgba(0, 198, 255, 0.2));
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
    }
    .tech-card {
      transition: all 0.3s ease;
      box-shadow: var(--shadow-soft);
    }
    .tech-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .badge-pill {
      font-variant-numeric: tabular-nums;
      letter-spacing: 0.02em;
    }