/* AI 指南站点通用样式 */
:root{
  --brand:#1f3a60; --accent:#3b7ddd; --text:#333; --muted:#666;
  --bg:#f7f8fb; --card:#fff; --border:#E5E9F2;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif; color:var(--text); background:var(--bg); line-height:1.7}
.container{max-width:1080px;margin:0 auto;padding:24px}
.header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.site-title{font-size:22px;color:var(--brand);font-weight:700;margin:0}
.nav{display:flex;gap:12px}
.nav a{color:var(--accent);text-decoration:none;font-weight:600}
.nav a:hover{text-decoration:underline}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:12px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;box-shadow:0 4px 12px rgba(31,58,96,0.06);transition:transform .2s ease,box-shadow .2s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 22px rgba(31,58,96,0.12)}
.card h2{margin:0 0 8px;color:var(--brand);font-size:18px}
.card p{margin:0;color:var(--muted)}
.card .actions{margin-top:10px}
.card .actions a{color:#2a6fdb;text-decoration:none;font-weight:600}
.section{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px;margin:14px 0}
.section h2{margin:0 0 10px; color:var(--brand); font-size:20px}
.section h3{margin:16px 0 8px; color:var(--brand); font-size:16px}
.section p{margin:0 0 10px}
.section ul{margin:0 0 10px 18px}
.badge{display:inline-block;background:#eef3ff;color:#2451b2;border:1px solid #d9e4ff;border-radius:999px;padding:4px 10px;font-size:12px;margin-right:6px}
.footer{color:var(--muted);text-align:center;padding:18px 0}
pre{background:#0b1020;color:#e8e9ed;border-radius:8px;padding:12px;overflow:auto}
code{font-family:SFMono-Regular,Consolas,Menlo,monospace}
.table{width:100%;border-collapse:collapse}
.table th,.table td{border:1px solid var(--border);padding:8px;text-align:left}
.table th{background:#f0f4ff;color:#1f3a60}
.aside{background:#fff8e6;border:1px solid #ffe0a3;color:#7a4e00;border-radius:8px;padding:12px;margin:12px 0}
.hero{background:linear-gradient(135deg,#f8fbff,#eef3ff);border:1px solid var(--border);border-radius:12px;padding:18px;margin-bottom:14px}
.hero h1{margin:0;color:var(--brand);font-size:24px}
.hero p{margin:6px 0 0;color:var(--muted)}