/* ===== 首页样式 ===== */
.section-title{font-size:1.5em;margin:0 0 25px;padding-bottom:10px;border-bottom:2px solid #1a6eff;display:inline-block;color:#333}
.columns{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:25px;margin-bottom:30px}
.card{background:#fff;border-radius:10px;padding:28px;box-shadow:0 1px 3px rgba(0,0,0,.06);transition:transform .2s,box-shadow .2s;border-left:4px solid transparent}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.12);border-left-color:#1a6eff}
.card .icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.2em;font-weight:700;color:#fff;margin-bottom:12px}
.icon-covid{background:#dc2626}
.icon-other{background:#7c3aed}
.icon-method{background:#2563eb}
.icon-case{background:#059669}
.icon-dict{background:#ea580c}
.icon-dash{background:#0891b2}
.card h3{font-size:1.15em;margin-bottom:8px;color:#333}
.card .tag{display:inline-block;background:#dbeafe;color:#1a6eff;padding:3px 10px;border-radius:12px;font-size:.78em;margin-bottom:10px}
.card p{font-size:.9em;color:#64748b;margin-bottom:14px;line-height:1.7}
.card a{color:#1a6eff;text-decoration:none;font-size:.9em;font-weight:600}
.card a:hover{text-decoration:underline}
table{width:100%;border-collapse:collapse}
th{background:#1a6eff;color:#fff;padding:10px 14px;font-size:.85em;text-align:left;font-weight:500}
td{padding:12px 14px;font-size:.9em;border-bottom:1px solid #f1f5f9}
tr:last-child td{border-bottom:none}
tbody tr:hover{background:#f0f7ff}
.cat-tag{display:inline-block;padding:2px 8px;border-radius:10px;font-size:.8em;background:#dbeafe;color:#1a6eff}