:root {
    --primary: #2271b1;
    --primary-dark: #1a5a8a;
    --bg: #f5f6f8;
    --card-bg: #ffffff;
    --text: #23282d;
    --muted: #6b7280;
    --border: #e5e7eb;
    --radius: 10px;
}
* { box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    line-height: 1.65;
}
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
header.site {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: 28px 0;
    margin-bottom: 30px;
}
header.site h1 { margin: 0 0 12px; font-size: 26px; }
header.site h1 a { color: #fff; text-decoration: none; }
.search-box { display: flex; gap: 8px; }
.search-box input {
    flex: 1; padding: 12px 16px; border: none; border-radius: 8px; font-size: 15px;
}
.search-box button {
    background: rgba(255,255,255,0.2); color: #fff; border: 1px solid rgba(255,255,255,0.4);
    padding: 12px 18px; border-radius: 8px; cursor: pointer; font-size: 15px;
}
.search-box button:hover { background: rgba(255,255,255,0.3); }

.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin-bottom: 40px; }
.cat-card {
    background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 20px; text-decoration: none; color: var(--text); transition: box-shadow .15s, transform .15s;
}
.cat-card:hover { box-shadow: 0 4px 14px rgba(0,0,0,.08); transform: translateY(-2px); }
.cat-card h3 { margin: 0 0 6px; color: var(--primary-dark); font-size: 17px; }
.cat-card span { color: var(--muted); font-size: 14px; }

.article-list { list-style: none; padding: 0; margin: 0; }
.article-list li {
    background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
    margin-bottom: 10px; padding: 16px 20px;
}
.article-list a { color: var(--text); text-decoration: none; font-size: 16px; font-weight: 500; }
.article-list a:hover { color: var(--primary); }
.article-list .meta { color: var(--muted); font-size: 13px; margin-top: 4px; }

.breadcrumb { margin-bottom: 20px; color: var(--muted); font-size: 14px; }
.breadcrumb a { color: var(--primary); text-decoration: none; }

.article-content {
    background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 32px; margin-bottom: 40px;
}
.article-content h1 { margin-top: 0; }
.article-content img { max-width: 100%; height: auto; border-radius: 6px; }
.article-content table { border-collapse: collapse; width: 100%; }
.article-content table td, .article-content table th { border: 1px solid var(--border); padding: 8px; }

footer.site { text-align: center; color: var(--muted); padding: 30px 0; font-size: 13px; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }