/* roulang page: index */
:root {
      --primary: #1E3A8A;
      --primary-hover: #1E40AF;
      --secondary: #0D9488;
      --accent: #D97706;
      --bg-light: #F8FAFC;
      --text-dark: #0F172A;
      --text-muted: #475569;
      --border-color: rgba(226, 232, 240, 0.9);
      --radius-box: 1rem;
      --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Lantinghei SC", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-dark);
      overflow-x: hidden;
      line-height: 1.8;
    }
    .custom-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-box);
      box-shadow: var(--shadow-subtle);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(30, 64, 175, 0.3);
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 58, 138, 0.88) 100%);
    }
    .touch-target {
      min-height: 44px;
      min-width: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .section-pad {
      padding-top: 5.5rem;
      padding-bottom: 5.5rem;
    }
    @media (max-width: 768px) {
      .section-pad {
        padding-top: 3.5rem;
        padding-bottom: 3.5rem;
      }
    }