:root{
  --bg:#f5f7fb;
  --paper:#ffffff;
  --ink:#0b1f3a;
  --muted:#4b5563;
  --line:#e5e7eb;
  --accent:#b8860b;
  --shadow:0 10px 30px rgba(0,0,0,.08);
  --radius:18px;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:#111827;font-family:var(--sans);line-height:1.55}
a{color:#0b4aa2;text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:960px;margin:0 auto;padding:28px 18px 72px}
.topbar{
  position:sticky; top:0; z-index:20;
  background:rgba(245,247,251,.92);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar .inner{max-width:960px;margin:0 auto;padding:10px 18px;display:flex;gap:10px;align-items:center;justify-content:space-between}
.brand{display:flex;flex-direction:column;gap:2px}
.brand .title{font-weight:800;color:var(--ink)}
.brand .sub{font-size:12px;color:var(--muted)}
.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.btn{
  appearance:none;border:1px solid var(--line);background:#fff;color:#111827;
  padding:9px 12px;border-radius:12px;cursor:pointer;font-weight:600;font-size:13px;
}
.btn:hover{border-color:#cbd5e1}
.select{border:1px solid var(--line);border-radius:12px;padding:9px 12px;background:#fff;font-weight:600;font-size:13px}
.paper{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:34px}
h1,h2,h3{color:#0b1f3a}
h1{font-family:var(--serif);font-size:38px;margin:0 0 10px}
h2{font-family:var(--serif);font-size:28px;margin:28px 0 10px}
h3{font-size:18px;margin:18px 0 6px}
p{margin:10px 0;color:#111827}
.lead{color:#374151;font-size:16px}
.muted{color:var(--muted)}
.kicker{display:inline-block;padding:6px 10px;border-radius:999px;background:#fff7e6;border:1px solid #ffe1a3;color:#7a5200;font-weight:800;font-size:12px}
.hr{height:1px;background:var(--line);margin:22px 0}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:820px){.grid2{grid-template-columns:1fr}}
.card{border:1px solid var(--line);border-radius:16px;padding:14px 14px;background:#fff}
.card .ctitle{font-weight:800;margin:0 0 6px;color:var(--ink)}
.callout{border-left:6px solid var(--accent);background:#fffdf4;border:1px solid #f1e3bf;border-radius:16px;padding:14px 14px}
.callout strong{color:#5a3c00}
table{width:100%;border-collapse:collapse;margin:10px 0 6px;font-size:13px}
th,td{border:1px solid var(--line);padding:10px 10px;vertical-align:top}
th{background:#f8fafc;text-align:left}
ul,ol{margin:8px 0 8px 22px}
li{margin:6px 0}
.badge{display:inline-block;font-size:12px;font-weight:800;color:#0b1f3a;background:#eef2ff;border:1px solid #c7d2fe;border-radius:999px;padding:4px 10px}
.footer-note{margin-top:18px;font-size:12px;color:#6b7280}
.cover{display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center}
.cover img{max-width:420px;width:100%;height:auto;border-radius:14px;border:1px solid var(--line);box-shadow:var(--shadow)}
.toc ol{margin-left:20px}
.small{font-size:13px}
.print-hint{font-size:12px;color:#6b7280;margin-top:10px}
@media print{
  body{background:#fff}
  .topbar, .print-hide{display:none !important}
  .container{max-width:none;padding:0}
  .paper{box-shadow:none;border:none;border-radius:0;padding:0}
  a{color:#000;text-decoration:none}
  h1{page-break-after:avoid}
  h2{page-break-after:avoid}
  .card,.callout{break-inside:avoid}
}