:root{
  --bg: #ffffff;
  --card: #f8f9fb;
  --text: #141414;
  --muted: #6b7280;
  --primary: #111111;
  --accent: #f1f5f9;
  --border: #e5e7eb;
  --code-bg: #0f1115;
  --code-fg: #e6edf3;
  --link: #111111;
}
.dark{
  --bg: #0b0c0e;
  --card: #0f1013;
  --text: #e6e6e6;
  --muted: #9aa1ad;
  --primary: #f2f2f2;
  --accent: #14161a;
  --border: #1e2026;
  --code-bg: #0a0c10;
  --code-fg: #e6edf3;
  --link: #cfd7ff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'SF Pro Text','Inter',Segoe UI,Roboto,Helvetica,Arial;}
a{color:var(--link);text-decoration:none} a:hover{text-decoration:underline}
#topbar{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.65);backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--border);}
.dark #topbar{background:rgba(0,0,0,.35)}
.topbar-inner{max-width:1400px;margin:0 auto;display:flex;align-items:center;gap:16px;padding:12px 16px;}
.logo{display:flex;flex-direction:column;line-height:1}
.logo .brand{font-weight:800;letter-spacing:.28em;font-size:14px}
.logo .tag{font-weight:500;letter-spacing:.35em;font-size:10px;color:var(--muted);text-transform:uppercase}
#themeToggle{margin-left:auto;border:1px solid var(--border);background:transparent;color:var(--text);padding:6px 12px;border-radius:999px;cursor:pointer}
#app{display:grid;grid-template-columns:280px 1fr;gap:20px;max-width:1400px;margin:0 auto;padding:16px}
#sidebar{position:sticky;top:56px;height:calc(100vh - 56px);overflow:auto;border-right:1px solid var(--border);padding-right:12px}
.nav-title{font-size:11px;color:var(--muted);margin:10px 0 6px 0;text-transform:uppercase;letter-spacing:.08em}
.nav-link{display:block;padding:8px 10px;border-radius:8px;color:var(--text)} .nav-link:hover{background:var(--accent)}
.active{background:linear-gradient(90deg,rgba(0,0,0,.06),transparent);border-left:3px solid var(--primary)}
#main{padding:4px 0}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:0 1px 0 rgba(16,24,40,.02),0 8px 24px rgba(0,0,0,.04);padding:14px;margin-bottom:16px}
.section{margin:14px 0;border:1px solid var(--border);border-radius:14px;background:var(--card)}
.section>summary{padding:14px 16px;font-weight:600;cursor:pointer}
.section[open]{border-color:#c9ccd3}
.section>summary::before{content:"▸ ";color:var(--muted)} .section[open]>summary::before{content:"▾ "}
details details{margin:8px 12px;border:1px dashed var(--border);border-radius:12px;background:transparent}
details details>summary{padding:10px 12px;font-weight:600}
details details[open]{border-color:#c3cadb}
pre{background:var(--code-bg);color:var(--code-fg);border:1px solid var(--border);border-radius:12px;padding:10px;overflow:auto}
.copywrap{position:relative} .copybtn{position:absolute;top:6px;right:6px;cursor:pointer;border:1px solid var(--border);background:rgba(255,255,255,.1);padding:4px 8px;border-radius:8px;font-size:12px;color:var(--code-fg)}
.copybtn.copyok{background:#1b5e20;color:#fff;border-color:#1b5e20}
#searchWrap{position:sticky;top:68px;z-index:10;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px;margin-bottom:10px}
#searchInput{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text)}
#searchWrap button{border:1px solid var(--border);background:transparent;padding:6px 10px;border-radius:10px;cursor:pointer;color:var(--text)}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;background:var(--accent);border:1px solid var(--border);font-size:12px;color:var(--muted);margin-left:8px}
.footer{margin:40px 0 20px 0;color:var(--muted);font-size:12px;text-align:center}
@media print{
  #sidebar,#topbar{display:none !important}
  #app{grid-template-columns:1fr;padding:0}
  .section,details details{break-inside:avoid}
}

/* Improved sidebar nav */
.nav-item{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 10px;border-radius:8px;color:var(--text)}
.nav-item:hover{background:var(--accent)}
.nav-item .title{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav-item .count{margin-left:10px;padding:2px 8px;border-radius:999px;background:var(--accent);border:1px solid var(--border);font-size:11px;color:var(--muted)}
.nav-link{display:block} /* Back-compat */