:root{
  --bg:#f7f8fa;
  --panel:#ffffff;
  --panel-2:#f2f4f7;
  --text:#16181d;
  --muted:#6f7682;
  --line:#e5e8ee;
  --accent:#1f6feb;
  --accent-soft:#eaf2ff;
  --code:#111827;
  --shadow:0 8px 30px rgba(18,24,40,.05);
}
body.dark{
  --bg:#0f1115;
  --panel:#151922;
  --panel-2:#1b202b;
  --text:#edf1f7;
  --muted:#9aa3b2;
  --line:#2a303b;
  --accent:#6ea8ff;
  --accent-soft:#18294a;
  --code:#0b0e13;
  --shadow:none;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,"Noto Sans SC",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text);
}
button,input{font:inherit}
button{color:inherit}
.app-shell{display:grid;grid-template-columns:280px 1fr;min-height:100vh}
.sidebar{
  position:sticky;top:0;height:100vh;padding:24px 18px;border-right:1px solid var(--line);
  background:var(--panel);display:flex;flex-direction:column;gap:24px;z-index:30;
}
.brand{display:flex;align-items:center;gap:12px;padding:0 8px;cursor:pointer}
.brand-mark{
  width:38px;height:38px;border-radius:12px;background:var(--text);color:var(--panel);
  display:grid;place-items:center;font-weight:700;
}
.brand-title{font-weight:700;letter-spacing:.02em}
.brand-subtitle{font-size:11px;color:var(--muted);margin-top:2px;text-transform:uppercase;letter-spacing:.1em}
.search-wrap{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:10px;padding:9px 10px;background:var(--bg)}
.search-wrap input{width:100%;border:none;outline:none;background:transparent;color:var(--text)}
.search-icon{color:var(--muted)}
kbd{border:1px solid var(--line);background:var(--panel);padding:2px 5px;border-radius:5px;font-size:10px;color:var(--muted)}
nav,.sidebar-section{display:flex;flex-direction:column;gap:6px}
.nav-item,.category-link{
  border:0;background:transparent;text-align:left;padding:10px 12px;border-radius:9px;cursor:pointer;color:var(--muted)
}
.nav-item:hover,.category-link:hover{background:var(--panel-2);color:var(--text)}
.nav-item.active{background:var(--accent-soft);color:var(--accent);font-weight:600}
.sidebar-label{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.12em;padding:8px 12px}
.category-link span{margin-right:8px;color:var(--accent)}
.sidebar-footer{margin-top:auto;color:var(--muted);font-size:12px;padding:0 12px}
.main{min-width:0}
.topbar{
  height:64px;position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%, transparent);
  backdrop-filter:blur(12px);display:flex;align-items:center;justify-content:space-between;
  padding:0 40px;border-bottom:1px solid var(--line);color:var(--muted);font-size:14px;
}
.top-actions{display:flex;align-items:center;gap:10px}
.ghost-btn,.primary-btn{
  border:1px solid var(--line);background:var(--panel);border-radius:9px;padding:8px 12px;text-decoration:none;cursor:pointer
}
.primary-btn{background:var(--text);color:var(--panel);border-color:var(--text)}
.mobile-menu{display:none;border:0;background:transparent;font-size:20px}
.content{max-width:1100px;margin:0 auto;padding:56px 44px 90px}
.hero{
  padding:18px 0 42px;border-bottom:1px solid var(--line);margin-bottom:34px
}
.eyebrow{font-size:12px;color:var(--accent);font-weight:700;letter-spacing:.1em;text-transform:uppercase}
.hero h1{font-size:clamp(40px,7vw,76px);line-height:1.02;margin:18px 0 18px;letter-spacing:-.04em}
.hero p{max-width:690px;font-size:18px;line-height:1.8;color:var(--muted);margin:0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin:26px 0 16px}
.section-head h2{font-size:20px;margin:0}
.section-head button{border:0;background:transparent;color:var(--accent);cursor:pointer}
.article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.card{
  border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:22px;cursor:pointer;
  transition:.18s ease;box-shadow:var(--shadow)
}
.card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent) 35%,var(--line))}
.meta{display:flex;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-bottom:13px}
.pill{background:var(--panel-2);border-radius:999px;padding:5px 8px}
.card h3{font-size:19px;margin:0 0 10px;line-height:1.45}
.card p{color:var(--muted);line-height:1.65;font-size:14px;margin:0}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:34px 0}
.stat{padding:18px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}
.stat strong{font-size:24px;display:block;margin-bottom:4px}
.stat span{font-size:12px;color:var(--muted)}
.list{border-top:1px solid var(--line)}
.list-item{padding:20px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr auto;gap:20px;cursor:pointer}
.list-item h3{margin:0 0 7px;font-size:18px}
.list-item p{margin:0;color:var(--muted);font-size:14px}
.list-date{color:var(--muted);font-size:12px}
.page-title{font-size:40px;margin:6px 0 12px;letter-spacing:-.03em}
.page-subtitle{color:var(--muted);line-height:1.7;margin-bottom:34px}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:var(--panel);padding:9px 11px;border-radius:999px;cursor:pointer}
.article{max-width:780px}
.article h1{font-size:42px;line-height:1.2;letter-spacing:-.03em;margin:14px 0}
.article-meta{color:var(--muted);font-size:13px;padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:28px}
.article h2{margin-top:34px;font-size:25px}
.article h3{margin-top:26px}
.article p,.article li{line-height:1.85;color:color-mix(in srgb,var(--text) 88%,var(--muted))}
.article code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--panel-2);padding:2px 5px;border-radius:5px;font-size:.9em}
.article pre{background:var(--code);color:#e6edf3;padding:18px;border-radius:12px;overflow:auto;line-height:1.6}
.article pre code{background:transparent;padding:0;color:inherit}
.callout{border-left:3px solid var(--accent);background:var(--accent-soft);padding:14px 16px;border-radius:0 10px 10px 0;margin:22px 0}
.empty{padding:50px 0;text-align:center;color:var(--muted)}
@media (max-width:900px){
  .app-shell{grid-template-columns:1fr}
  .sidebar{position:fixed;left:-290px;transition:.2s ease;width:280px;box-shadow:0 20px 50px rgba(0,0,0,.15)}
  .sidebar.open{left:0}
  .mobile-menu{display:block}
  .topbar{padding:0 20px}
  .content{padding:38px 22px 70px}
  .article-grid{grid-template-columns:1fr}
  .stat-row{grid-template-columns:1fr}
}