:root { --primary: #0066FF; --primary-hover: #0052CC; --primary-light: #E6F0FF; --text-main: #1A1A1A; --text-sub: #5C6C80; --text-light: #8C9AAE; --bg-white: #FFFFFF; --bg-gray: #F5F8FF; --bg-footer: #111827; --border: #E2E8F0; --radius-sm: 8px; --radius-md: 12px; --radius-lg: 20px; --container: 1160px; --shadow-sm: 0 2px 8px rgba(0,0,0,0.04); }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text-main); background: var(--bg-white); line-height: 1.6; -webkit-font-smoothing: antialiased; }
    a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
    a:hover { color: var(--primary-hover); }
    ul, ol { list-style: none; }
    img, svg { max-width: 100%; display: block; height: auto; }
    .container { width: min(100% - 40px, var(--container)); margin-inline: auto; }

    /* 按钮与导航 */
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; height: 44px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600; cursor: pointer; transition: all 0.2s; border: 1px solid transparent; white-space: nowrap; }
    .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(0,102,255,0.2); }
    .btn-primary:hover { background: var(--primary-hover); color: #fff; transform: translateY(-1px); }
    
    .header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
    .header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
    .logo img { height: 40px; width: auto; }
    .nav-links { display: flex; gap: 32px; }
    .nav-links a { color: var(--text-main); font-size: 15px; font-weight: 500; }
    .nav-links a:hover, .nav-links a.active { color: var(--primary); }

    /* 面包屑 */
    .breadcrumbs { padding: 24px 0; font-size: 14px; color: var(--text-sub); }
    .breadcrumbs a { color: var(--text-sub); }
    .breadcrumbs a:hover { color: var(--primary); }
    .breadcrumbs span { margin: 0 8px; color: var(--text-light); }

    /* 文章头部 */
    .article-header { text-align: center; margin-bottom: 40px; }
    .article-meta { display: inline-flex; align-items: center; gap: 16px; font-size: 14px; color: var(--text-light); margin-bottom: 16px; }
    .article-tag { color: var(--primary); background: var(--primary-light); padding: 4px 12px; border-radius: 4px; font-weight: 600; }
    .article-header h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; color: #0B1A30; line-height: 1.3; margin-bottom: 24px; }
    
    /* 封面图占满宽度 */
    .article-cover { border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 48px; width: 100%; background: var(--bg-gray); }
    .article-cover img { width: 100%; max-height: 500px; object-fit: cover; }

    /* 正文排版 */
    .article-content { font-size: 17px; color: #333; line-height: 1.8; width: 100%; }
    .article-content p { margin-bottom: 24px; }
    .article-content h2 { font-size: 26px; font-weight: 800; color: #0B1A30; margin: 48px 0 24px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
    .article-content h3 { font-size: 20px; font-weight: 700; color: #0B1A30; margin: 32px 0 16px; }
    .article-content strong { color: #0B1A30; font-weight: 600; }
    .article-content a { font-weight: 500; text-decoration: underline; text-underline-offset: 3px; }
    
    /* 引用块 */
    .article-content blockquote { margin: 32px 0; padding: 20px 24px; background: var(--bg-gray); border-left: 4px solid var(--primary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-sub); font-style: italic; }
    
    /* 列表 */
    .article-content ul, .article-content ol { margin-bottom: 24px; padding-left: 24px; }
    .article-content ul li { list-style: disc; margin-bottom: 12px; }
    .article-content ol li { list-style: decimal; margin-bottom: 12px; }

    /* 表格宽度 100% */
    .table-responsive { overflow-x: auto; margin: 32px 0; border: 1px solid var(--border); border-radius: var(--radius-md); width: 100%; }
    table { width: 100%; border-collapse: collapse; text-align: left; min-width: 600px; }
    th, td { padding: 16px 20px; border-bottom: 1px solid var(--border); }
    th { background: var(--bg-gray); font-weight: 700; color: var(--text-main); }
    td { color: var(--text-sub); }
    .table-highlight { background: var(--primary-light); color: var(--primary); font-weight: 600; }

    /* 提示框 */
    .tip-box { background: #F0FDF4; border: 1px solid #BBF7D0; border-radius: var(--radius-sm); padding: 20px 24px; margin: 32px 0; color: #166534; font-size: 15px; width: 100%; }
    .tip-box strong { color: #166534; }

    /* 底部操作区 */
    .article-footer { margin-top: 64px; padding-top: 32px; border-top: 1px solid var(--border); text-align: center; width: 100%; }
    .article-footer h3 { font-size: 22px; margin-bottom: 12px; color: #0B1A30; }
    .article-footer p { color: var(--text-sub); margin-bottom: 24px; }

    /* 相关文章推荐 */
    .related-section { background: var(--bg-gray); padding: 64px 0; margin-top: 64px; border-top: 1px solid var(--border); }
    .related-section h2 { font-size: 24px; font-weight: 800; text-align: center; margin-bottom: 40px; }
    .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; width: 100%; }
    .related-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); padding: 24px; display: flex; flex-direction: column; transition: border-color 0.2s; }
    .related-card:hover { border-color: var(--primary); }
    .related-card h3 { font-size: 16px; margin-bottom: 12px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; word-break: break-word; }
    .related-card h3 a { color: var(--text-main); text-decoration: none; }
    .related-card:hover h3 a { color: var(--primary); }
    .related-card p { font-size: 14px; color: var(--text-sub); margin-bottom: 16px; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

    /* Footer */
    .footer { background: var(--bg-footer); color: #94A3B8; padding: 80px 0 32px; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 64px; }
    .footer-brand img { height: 40px; margin-bottom: 20px; }
    .footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 24px; }
    .footer-col a { color: #94A3B8; font-size: 14px; display: block; margin-bottom: 12px; }
    .footer-col a:hover { color: #fff; }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 32px; display: flex; justify-content: space-between; font-size: 13px; }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .related-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; text-align: center; gap: 32px; }
      .footer-brand p { margin: 0 auto; }
      .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
      .article-content { font-size: 16px; }
    }