:root{
  --bg:#ffffff; --text:#213547; --muted:#5d6b7a; --line:#e7e9ee;
  --accent:#8b5cf6; --accent2:#ec4899; --soft:#f7f5ff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;
  color:var(--text);background:var(--bg);line-height:1.7;font-size:15px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
/* topbar */
.topbar{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;padding:10px 16px}
.brand{font-weight:900;font-size:18px;color:var(--accent);white-space:nowrap}
.brand b{color:var(--text)}
.menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:8px;padding:6px 11px;font-size:15px;cursor:pointer}
.search{flex:1;max-width:440px;margin-left:auto;display:flex;align-items:center;gap:6px;background:var(--soft);
  border:1px solid var(--line);border-radius:22px;padding:7px 14px}
.search input{border:none;background:transparent;outline:none;flex:1;font-size:14px}
/* layout */
.layout{display:flex;max-width:1120px;margin:0 auto;align-items:flex-start}
.sidebar{width:232px;flex:0 0 232px;position:sticky;top:57px;align-self:flex-start;
  max-height:calc(100vh - 57px);overflow-y:auto;padding:18px 10px 40px 16px;border-right:1px solid var(--line)}
.sidebar .grp{font-size:11px;letter-spacing:1px;color:var(--muted);margin:14px 0 6px;font-weight:700}
.sidebar a{display:block;padding:6px 10px;border-radius:8px;color:var(--text);font-size:14px}
.sidebar a:hover{background:var(--soft);text-decoration:none}
.sidebar a.active{background:var(--accent);color:#fff;font-weight:700}
.content{flex:1;min-width:0;padding:24px 30px 60px}
.content h1{font-size:30px;margin:0 0 6px;display:flex;align-items:center;gap:10px}
.content .lead{color:var(--muted);margin:0 0 22px;font-size:15px}
.content h2{font-size:21px;margin:32px 0 10px;padding-bottom:6px;border-bottom:2px solid var(--line)}
.content h3{font-size:16px;margin:20px 0 8px;color:var(--accent)}
.res{list-style:none;padding:0;margin:0}
.res li{padding:9px 0;border-bottom:1px solid var(--line)}
.res .nm{font-weight:700}
.res .ds{color:var(--muted);font-size:13px}
.tag{font-size:11px;margin-left:6px;color:#b45309;font-weight:700}
.tag.ext-tag{color:#0e7490;background:#e0f2fe;border-radius:6px;padding:1px 6px}
.res .ext{font-size:12px;color:#0e7490;margin:0 4px}
.res .sec{background:var(--soft);border-left:3px solid var(--accent2);padding-left:10px}
.res .sec a{font-weight:700}
.res .note,.note{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:10px;padding:9px 12px;font-size:13px;margin:10px 0}
.content h4{font-size:14px;margin:14px 0 6px;color:var(--muted)}
/* home */
.hero{text-align:center;padding:48px 16px 30px;background:linear-gradient(160deg,#faf7ff,#fff)}
.hero h1{justify-content:center;font-size:33px}
.hero p{color:var(--muted);max-width:540px;margin:8px auto 0}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;
  max-width:1120px;margin:26px auto;padding:0 16px}
.card{display:block;border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff;transition:.15s}
.card:hover{box-shadow:0 6px 20px rgba(139,92,246,.14);border-color:var(--accent);text-decoration:none}
.card .em{font-size:26px}
.card .tt{font-weight:800;margin:6px 0 3px;color:var(--text)}
.card .dd{font-size:12.5px;color:var(--muted)}
/* footer */
footer{border-top:1px solid var(--line);margin-top:40px;padding:22px 16px;color:var(--muted);font-size:12.5px;text-align:center}
footer .disc{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:12px;
  margin:0 auto 12px;max-width:780px;text-align:left;color:#6b6480;line-height:1.7}
.legend{margin-top:8px}
@media(max-width:820px){
  .menu-btn{display:inline-block}
  .sidebar{position:fixed;top:57px;left:0;height:calc(100vh - 57px);background:#fff;z-index:39;
    transform:translateX(-100%);transition:.2s;box-shadow:4px 0 20px rgba(0,0,0,.08)}
  .sidebar.open{transform:translateX(0)}
  .content{padding:18px 16px 50px}
  .search{margin-left:8px}
}