/* CET-6 备考站 · 文档页样式 */
:root{--ink:#17233b;--muted:#6b7a90;--line:#e3e9f2;--blue:#2563eb;--bg:#f6f8fc;--card:#fff}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.doc-page{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.72;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",system-ui,sans-serif}
.sitebar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);
  border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.bar-wrap{max-width:1080px;margin:0 auto;padding:0 20px;min-height:60px;display:flex;
  align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.site-brand{display:flex;align-items:center;gap:9px;font-weight:800;color:var(--ink);text-decoration:none;font-size:17px}
.site-logo{background:var(--blue);color:#fff;border-radius:8px;padding:2px 8px;font-size:13px;letter-spacing:.5px}
.site-nav{display:flex;gap:4px;flex-wrap:wrap}
.nav-link{color:#42526b;text-decoration:none;font-size:14px;font-weight:600;padding:7px 11px;border-radius:9px}
.nav-link:hover{background:#eef3ff;color:#1d4ed8}
.nav-link.active{background:var(--blue);color:#fff}
.doc-main{max-width:1080px;margin:0 auto;padding:26px 20px 64px}
.doc-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.doc-head .back,.doc-head .download{font-size:14px;font-weight:700;text-decoration:none;color:#2b4ea8;
  background:#eef3ff;border:1px solid #dbe6ff;border-radius:9px;padding:7px 12px}
.doc-head .download{color:#15803d;background:#eefaf1;border-color:#cfeddb}
.markdown{background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:28px 30px;box-shadow:0 1px 2px rgba(16,24,40,.04);overflow-wrap:break-word}
.markdown h1{font-size:28px;line-height:1.3;margin:0 0 14px;padding-bottom:12px;border-bottom:2px solid #eef3ff}
.markdown h2{font-size:22px;margin:30px 0 10px;padding-left:11px;border-left:4px solid var(--blue);line-height:1.35}
.markdown h3{font-size:18px;margin:22px 0 8px}
.markdown h4{font-size:16.5px;margin:18px 0 6px}
.markdown p{margin:10px 0}
.markdown ul,.markdown ol{margin:10px 0;padding-left:24px}
.markdown li{margin:5px 0}
.markdown li.task-item{list-style:none;margin-left:-20px;display:flex;gap:8px;align-items:flex-start}
.markdown li.task-item .box{color:#2563eb;font-size:16px;line-height:1.6}
.markdown blockquote{margin:14px 0;padding:10px 14px;background:#f4f8ff;border-left:4px solid #93b4f8;
  border-radius:8px;color:#3d4f6c;font-size:14.5px}
.markdown code{background:#eef2f9;border:1px solid #e2e8f3;border-radius:5px;padding:1px 5px;
  font-size:.9em;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;color:#1e3a8a}
.markdown pre{background:#0f172a;color:#dbe6ff;border-radius:12px;padding:14px 16px;overflow:auto;font-size:13.5px}
.markdown pre code{background:none;border:none;color:inherit;padding:0}
.markdown table{border-collapse:collapse;width:100%;font-size:14px}
.markdown .table-wrap{overflow-x:auto;margin:14px 0;border:1px solid var(--line);border-radius:12px}
.markdown th,.markdown td{border-bottom:1px solid #edf1f8;padding:9px 12px;text-align:left;vertical-align:top}
.markdown th{background:#f4f7fc;font-weight:700;white-space:nowrap}
.markdown tr:last-child td{border-bottom:none}
.markdown tr:nth-child(even) td{background:#fbfcfe}
.markdown hr{border:none;border-top:1px solid var(--line);margin:26px 0}
.markdown a{color:#1d4ed8;text-decoration:none;border-bottom:1px solid #c7d8fb}
.markdown a:hover{border-bottom-color:#1d4ed8}
.markdown strong{color:#0f1b33}
.material-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
@media(max-width:760px){.material-grid{grid-template-columns:1fr}}
.material-card{display:flex;flex-direction:column;gap:6px;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:16px 18px;text-decoration:none;color:var(--ink);transition:.15s}
.material-card:hover{border-color:#b9cdf5;box-shadow:0 6px 18px rgba(37,99,235,.08);transform:translateY(-1px)}
.material-card .no{color:#2b4ea8;background:#eef3ff;border-radius:7px;font-size:12px;font-weight:800;
  padding:1px 8px;align-self:flex-start}
.material-card h3{margin:2px 0 0;font-size:17px}
.material-card p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.6}
.material-card .more{margin-top:auto;color:#1d4ed8;font-size:13px;font-weight:700}
.page-lead h1{font-size:27px;margin:0 0 8px}
.page-lead p{color:var(--muted);margin:0 0 18px}
.notice{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:12px;padding:12px 16px;font-size:14px;margin:16px 0}
.sitefoot{max-width:1080px;margin:0 auto;padding:20px;color:#7b8aa3;font-size:12.5px;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.sitefoot a{color:inherit}
@media(max-width:640px){.markdown{padding:20px 16px}.sitebar{position:static}}
@media print{.sitebar,.sitefoot,.doc-head{display:none}.markdown{border:none;box-shadow:none;padding:0}}