:root{
  --bg:#f7f7f5;--surface:#fff;--ink:#1a1a1a;--sub:#6b7280;--line:#e8e8e4;
  --accent:#2563eb;--radius:14px;
  font-family:"Hiragino Sans","Yu Gothic",-apple-system,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--bg);color:var(--ink);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}

/* topbar */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:20px;
  padding:0 24px;height:60px;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.logo{font-weight:800;font-size:20px;letter-spacing:-.5px;white-space:nowrap}
.logo span{color:var(--accent)}
.searchbox{position:relative;flex:1;max-width:560px;margin:0 auto}
.searchbox input{width:100%;height:40px;border:none;border-radius:20px;background:#efefec;
  padding:0 18px;font-size:14px;outline:none}
.searchbox input:focus{background:#fff;box-shadow:0 0 0 2px var(--accent)}
#results{position:absolute;top:46px;left:0;right:0;background:#fff;border-radius:12px;
  box-shadow:0 8px 30px rgba(0,0,0,.12);max-height:60vh;overflow:auto;display:none}
#results.show{display:block}
#results a{display:block;padding:10px 16px;border-bottom:1px solid var(--line);font-size:14px}
#results a:hover{background:#f5f5f2}
#results a b{color:var(--accent)}
#results .r-cat{font-size:11px;color:var(--sub);margin-left:8px}
.menu-btn{display:none;background:none;border:none;font-size:22px;cursor:pointer}

/* layout */
.layout{display:flex;max-width:1280px;margin:0 auto;min-height:calc(100vh - 60px)}
.sidebar{width:230px;flex-shrink:0;padding:24px 12px;position:sticky;top:60px;
  height:calc(100vh - 60px);overflow-y:auto}
.sidebar a{display:flex;align-items:center;gap:10px;padding:9px 14px;border-radius:10px;
  font-size:14px;color:#374151;margin-bottom:2px}
.sidebar a:hover{background:#ececе8;background:#ececea}
.sidebar a.active{background:#e8edfb;color:var(--accent);font-weight:700}
.nav-icon{width:20px;text-align:center}
.nav-sec{font-size:11px;color:var(--sub);font-weight:700;margin:18px 14px 6px;letter-spacing:.05em}
main{flex:1;padding:32px 32px 80px;min-width:0}

/* hero (help center style) */
.hero{padding:56px 20px 40px;text-align:center;background:
  radial-gradient(600px 240px at 20% 0%,rgba(37,99,235,.08),transparent),
  radial-gradient(600px 240px at 80% 10%,rgba(244,63,94,.06),transparent);
  border-radius:0 0 24px 24px;margin:-32px -32px 10px}
.hero-eyebrow{font-size:11px;font-weight:800;letter-spacing:.18em;color:var(--accent)}
.hero h1{font-size:36px;letter-spacing:-1px;margin:10px 0 8px}
.hero-sub{color:var(--sub);font-size:14px}
.hero-search{max-width:600px;margin:26px auto 0}
.hero-search input{height:52px;border-radius:26px;background:#fff;font-size:15px;
  box-shadow:0 6px 24px rgba(0,0,0,.08);padding:0 24px}
.hero-search #results{top:58px}
.sec-title{font-size:19px;margin:38px 0 16px}

/* folder cards (KgBase style) */
.folders{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.folder{display:block;transition:transform .15s}
.folder:hover{transform:translateY(-3px)}
.folder-tab{width:42%;height:12px;background:var(--c);border-radius:8px 8px 0 0;margin-left:2px;opacity:.85}
.folder-body{background:color-mix(in srgb,var(--c) 82%,#fff);border-radius:0 12px 12px 12px;
  padding:18px 16px 14px;color:#fff;min-height:96px;display:flex;flex-direction:column;gap:4px}
.f-icon{font-size:20px}
.folder-body h3{font-size:15px;font-weight:800;letter-spacing:-.02em}
.f-count{font-size:11px;opacity:.85;margin-top:auto}

/* news-list rows */
.rows{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.row{display:flex;align-items:center;gap:18px;padding:15px 22px;border-bottom:1px solid var(--line);
  transition:background .1s}
.row:last-child{border-bottom:none}
.row:hover{background:#f7f8ff}
.row-date{font-size:12px;color:var(--sub);font-variant-numeric:tabular-nums;white-space:nowrap}
.row-title{font-size:14.5px;font-weight:600;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row-arrow{color:var(--sub);font-size:14px}
.row:hover .row-arrow{color:var(--accent)}
.cat-badge{width:52px;height:52px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  font-size:26px;background:color-mix(in srgb,var(--c) 14%,#fff)}

/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.card{background:var(--surface);border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--line);display:flex;flex-direction:column;
  transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(0,0,0,.09)}
.thumb{height:126px;position:relative;display:flex;flex-direction:column;justify-content:center;
  padding:14px 18px;gap:6px;overflow:hidden;
  background:linear-gradient(var(--ang,135deg),
    color-mix(in srgb,var(--c) calc(var(--mix,35%)/2.2),#fff),
    color-mix(in srgb,var(--c) var(--mix,35%),#fff))}
.th-icon{font-size:20px;opacity:.9}
.th-title{font-size:15px;font-weight:800;line-height:1.4;letter-spacing:-.02em;
  color:color-mix(in srgb,var(--c) 72%,#000);
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-body h3{font-size:15px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;
  -webkit-box-orient:vertical;overflow:hidden}
.card-body p{font-size:12px;color:var(--sub);display:-webkit-box;-webkit-line-clamp:2;
  -webkit-box-orient:vertical;overflow:hidden;flex:1}
.meta{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--sub)}
.tag{background:color-mix(in srgb,var(--c) 12%,#fff);color:var(--c);padding:2px 10px;
  border-radius:999px;font-weight:700;font-size:11px}

/* category tiles */
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:14px}
.cat-tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;display:flex;align-items:center;gap:12px;transition:transform .15s,box-shadow .15s}
.cat-tile:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(0,0,0,.08)}
.ct-icon{font-size:24px}
.ct-label{font-size:14px;font-weight:700;flex:1}
.ct-count{font-size:12px;color:#fff;background:var(--c);border-radius:999px;padding:1px 9px}

/* category page */
.cat-head{margin:10px 0 24px;display:flex;align-items:center;gap:16px}
.cat-head h1{font-size:26px}
.cat-head p{color:var(--sub);font-size:13px}
.empty{color:var(--sub)}

/* article */
article{max-width:760px;margin:0 auto;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:48px 56px}
.art-head h1{font-size:28px;line-height:1.4;margin:14px 0 8px;letter-spacing:-.5px}
.art-date{font-size:12px;color:var(--sub)}
.art-body{margin-top:30px;font-size:15.5px}
.art-body h1,.art-body h2{font-size:21px;margin:34px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.art-body h3{font-size:17px;margin:26px 0 10px}
.art-body h4{font-size:15px;margin:20px 0 8px}
.art-body p{margin:10px 0}
.art-body ul,.art-body ol{margin:10px 0 10px 24px}
.art-body li{margin:4px 0}
.art-body blockquote{border-left:3px solid var(--accent);padding:4px 16px;color:var(--sub);
  background:#f5f7ff;border-radius:0 8px 8px 0;margin:14px 0}
.art-body code{background:#f1f1ee;padding:2px 6px;border-radius:5px;font-size:13px}
.art-body pre{background:#1e293b;color:#e2e8f0;padding:16px 20px;border-radius:10px;
  overflow-x:auto;margin:14px 0}
.art-body pre code{background:none;color:inherit;padding:0}
.art-body table{border-collapse:collapse;margin:16px 0;width:100%;font-size:14px;display:block;overflow-x:auto}
.art-body th,.art-body td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.art-body th{background:#f5f5f2}
.art-body a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.wikilink{font-weight:600}
.wikilink-dead{color:var(--sub);border-bottom:1px dashed #ccc}
.art-body hr{border:none;border-top:1px solid var(--line);margin:24px 0}

footer{text-align:center;padding:40px 20px;color:var(--sub);font-size:12px;border-top:1px solid var(--line)}

/* mobile */
@media (max-width:840px){
  .menu-btn{display:block}
  .sidebar{position:fixed;left:0;top:60px;background:#fff;z-index:40;transform:translateX(-100%);
    transition:transform .2s;box-shadow:4px 0 20px rgba(0,0,0,.08)}
  body.nav-open .sidebar{transform:none}
  main{padding:20px 16px 60px}
  article{padding:28px 20px}
  .logo{font-size:17px}
}