:root{
  --blue:#2563eb; --blue-dark:#1d4ed8; --blue-light:#eff6ff;
  --pink:#db2777; --red:#dc2626;
  --ink:#0f172a; --ink-soft:#475569; --muted:#64748b; --border:#e2e8f0;
  --bg:#f8fafc; --card:#ffffff;
  --code-bg:#1e1e1e; --code-text:#d4d4d4;
  --radius:10px;
  --font:'Segoe UI',Roboto,-apple-system,Arial,sans-serif;
  --mono:'Fira Code','Consolas',monospace;
}
html[data-theme='dark']{
  --ink:#e2e8f0; --ink-soft:#cbd5e1; --muted:#94a3b8;
  --border:#2b3648; --bg:#0f172a; --card:#1a2436; --blue-light:#16233d;
}
*{box-sizing:border-box}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);transition:background .2s,color .2s}
a{color:var(--blue);text-decoration:none}
a:hover{opacity:.85}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}

/* header */
.site-header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}
.header-in{display:flex;align-items:center;gap:18px;height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-family:var(--mono)}
.brand-text .t{font-weight:700;font-size:16px;color:var(--ink)}
.brand-text .s{font-size:12px;color:var(--muted)}
.main-nav{display:flex;gap:4px;flex-wrap:wrap}
.main-nav a{padding:8px 12px;border-radius:8px;font-size:14px;font-weight:600;color:var(--ink-soft)}
.main-nav a:hover{background:var(--blue-light);color:var(--blue);opacity:1}
.header-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.icon-btn{width:36px;height:36px;border-radius:8px;border:1px solid var(--border);background:var(--card);
  display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--ink-soft)}
.icon-btn:hover{background:var(--blue-light)}
.icon-btn svg{width:18px;height:18px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border-radius:8px;font-size:13px;
  font-weight:700;border:0;cursor:pointer;white-space:nowrap}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--blue-dark);opacity:1}
#search-input{padding:8px 12px;border-radius:8px;border:1px solid var(--border);background:var(--bg);
  color:var(--ink);font-size:13px;min-width:190px}

/* CTA banner */
.cta-banner{background:linear-gradient(90deg,var(--blue),#4f46e5);color:#fff;padding:10px 0;font-size:13px}
.cta-banner .wrap{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;text-align:center}
.cta-banner a{color:#fff;text-decoration:underline;font-weight:700}

/* layout */
.layout{display:flex;gap:28px;padding:28px 0 60px;align-items:flex-start}
.main-col{flex:1;min-width:0}
.side-col{width:300px;flex-shrink:0}
@media (max-width:900px){.layout{flex-direction:column}.side-col{width:100%}}

/* command cards */
.post-outer{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px 24px;margin-bottom:18px}
.post-title{font-family:var(--mono);font-size:20px;margin:0 0 8px;color:var(--ink)}
.post-title a{color:inherit}
.post-title::before{content:'\\';color:var(--blue);margin-right:2px}
.post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:0 0 14px;
  font-size:12px;color:var(--muted)}
.post-meta a{color:var(--muted);font-weight:600}
.post-meta a:hover{color:var(--blue)}
.post-meta .dot{opacity:.6}
.label-pill{display:inline-block;background:var(--blue-light);color:var(--blue) !important;
  padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700}
.post-body{color:var(--ink-soft);line-height:1.7;font-size:15px}
.post-body pre{background:var(--code-bg);color:var(--code-text);padding:16px 18px;border-radius:8px;
  overflow-x:auto;font-family:var(--mono);font-size:13px;line-height:1.6;margin:14px 0;position:relative}
.post-body code{font-family:var(--mono)}
.copy-btn{position:absolute;top:8px;right:8px;font-size:11px;padding:5px 9px;border-radius:6px;
  border:1px solid #444;background:#2a2a2a;color:#ddd;cursor:pointer}
.copy-btn:hover{background:#3a3a3a}
.post-snippet{color:var(--ink-soft);line-height:1.7;font-size:14px;margin:0 0 12px}
.read-more{display:inline-block;font-weight:700;font-size:13px}

/* sidebar */
.widget-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:18px;margin-bottom:20px}
.widget-card h2{font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:0 0 14px}
.contribute-card{background:linear-gradient(160deg,var(--blue),#4338ca);color:#fff;border:0}
.contribute-card p{font-size:13px;line-height:1.6;opacity:.95;margin:0 0 14px}
.contribute-card .btn{width:100%;justify-content:center;background:#fff;color:var(--blue-dark)}
.cat-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}

/* footer */
.site-footer{border-top:1px solid var(--border);padding:26px 0;font-size:13px;color:var(--muted)}
.footer-in{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* mobile nav */
.nav-toggle{display:none}
@media (max-width:720px){
  .main-nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--card);
    border-bottom:1px solid var(--border);flex-direction:column;padding:10px 20px}
  .main-nav.open{display:flex}
  .nav-toggle{display:flex}
}