/* roulang page: index */
:root {
      --primary-navy: #1E40AF;
      --primary-blue: #2563EB;
      --primary-cobalt: #3B82F6;
      --dark-slate: #0F172A;
      --text-main: #334155;
      --text-muted: #64748B;
      --card-bg: #FFFFFF;
      --border-color: #E2E8F0;
      --card-shadow: 0 4px 20px -2px rgba(30, 64, 175, 0.05);
      --card-hover-shadow: 0 16px 32px -4px rgba(37, 99, 235, 0.12);
    }
    
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    }
    
    body {
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
    }

    .custom-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: #BFDBFE;
    }

    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 64, 175, 0.88) 100%);
    }

    /* 移动端与桌面微型转化条 */
    .sticky-bar-shadow {
      box-shadow: 0 -4px 20px rgba(15, 23, 42, 0.08);
    }

    /* 代码与参数视窗 */
    .terminal-box {
      background-color: #0B1120;
      border: 1px solid #1E293B;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }