/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #0284C7;
      --amber: #F59E0B;
      --bg-page: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-soft: #E2E8F0;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(15, 23, 42, 0.92), rgba(30, 64, 175, 0.82)), url('/assets/images/b1dd02ad4d0a2252.png');
      background-size: cover;
      background-position: center;
    }
    .card-transition {
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -6px rgba(15, 23, 42, 0.12), 0 4px 8px -4px rgba(15, 23, 42, 0.06);
    }
    .interactive-btn {
      transition: transform 0.15s ease, background-color 0.2s ease, box-shadow 0.2s ease;
    }
    .interactive-btn:active {
      transform: scale(0.97);
    }