/* roulang page: index */
:root {
      --bg-main: #F8FAFC;
      --color-primary: #0A58CA;
      --color-deep: #003B95;
      --color-dark: #0B132B;
      --color-text: #1E293B;
      --color-subtext: #475569;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
      --card-shadow-hover: 0 16px 32px -4px rgba(15, 23, 42, 0.12);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--color-text);
      overflow-x: hidden;
    }
    .card-modern {
      background: #ffffff;
      border: 1px solid #F1F5F9;
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-modern:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .dark-card-modern {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      transition: all 0.3s ease;
    }
    .dark-card-modern:hover {
      border-color: rgba(0, 163, 196, 0.4);
      background: rgba(255, 255, 255, 0.05);
    }