/* roulang page: index */
:root {
      --primary-deep: #0A4B5C;
      --primary-light: #0E7490;
      --primary-cyan: #06B6D4;
      --accent-amber: #F59E0B;
      --accent-gold: #D97706;
      --bg-light: #F8FAFC;
      --bg-light-alt: #F1F5F9;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-box: 1rem;
      --shadow-subtle: 0 10px 30px -10px rgba(10, 75, 92, 0.08);
      --shadow-hover: 0 20px 35px -10px rgba(10, 75, 92, 0.16);
    }
    
    body {
      font-family: var(--font-sans, system-ui, -apple-system, 'PingFang SC', sans-serif);
      color: var(--text-body);
      background-color: var(--bg-light);
      line-height: 1.8;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      letter-spacing: -0.02em;
    }
    
    .custom-shadow {
      box-shadow: var(--shadow-subtle);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    
    /* 轮播滑动动画 */
    .hero-slide {
      transition: opacity 0.7s ease-in-out;
    }
    
    /* 折叠手风琴动效 */
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .arrow-icon {
      transform: rotate(180deg);
    }
    
    /* 等宽专显数字 */
    .metric-number {
      font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
      font-feature-settings: "tnum";
    }