/* roulang page: index */
:root {
      --color-primary: #10529E;
      --color-primary-dark: #093364;
      --color-secondary: #00A3A6;
      --color-dark: #0A1C33;
      --color-text: #334155;
      --color-heading: #0F172A;
      --color-muted: #64748B;
      --color-bg: #F8FAFC;
      --color-bg-alt: #F0F4F8;
      --color-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    }
    body {
      color: var(--color-text);
      background-color: #ffffff;
      overflow-x: hidden;
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(10, 28, 51, 0.95), rgba(16, 82, 158, 0.85)), url('/assets/images/53a482769c333898.webp');
      background-size: cover;
      background-position: center;
    }
    .dark-section-bg {
      background-image: linear-gradient(180deg, #0A1C33 0%, #081628 100%), url('/assets/images/99e6b92478e978b6.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
    }
    .banner-strip-bg {
      background-image: linear-gradient(135deg, rgba(16, 82, 158, 0.92), rgba(0, 163, 166, 0.88)), url('/assets/images/a2e1f7d202438815.webp');
      background-size: cover;
      background-position: center;
    }
    .card-transition {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-transition:hover {
      transform: translateY(-5px);
      box-shadow: 0 16px 32px -4px rgba(16, 82, 158, 0.14);
    }
    /* 手风琴平滑展开 */
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .fa-chevron-down {
      transform: rotate(180deg);
    }