:root{
  --bg:#0b1220;
  --panel:#0f172a;
  --panel2:#111c33;
  --text:#e2e8f0;
  --muted:#94a3b8;
  --line:#1e293b;
  --accent:#60a5fa;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background:var(--bg);
  color:var(--text);
}

.topbar{
  position:sticky; top:0; z-index:20;
  display:flex; gap:16px;
  align-items:center; justify-content:space-between;
  padding:14px 18px;
  background:linear-gradient(180deg, #0f172a 0%, #0b1220 100%);
  border-bottom:1px solid var(--line);
}

.brand h1{margin:0; font-size:18px}
.brand p{margin:4px 0 0; color:var(--muted); font-size:12px}

.searchbox input{
  width:min(420px, 60vw);
  padding:10px 12px;
  border:1px solid var(--line);
  border-radius:12px;
  background:var(--panel2);
  color:var(--text);
  outline:none;
}

.layout{
  display:grid;
  grid-template-columns: 320px 1fr;
  gap:14px;
  padding:14px;
}

.sidebar{
  position:sticky; top:68px;
  height:calc(100vh - 90px);
  overflow:auto;
  border:1px solid var(--line);
  border-radius:16px;
  background:var(--panel);
  padding:12px;
}

.sidebar nav a{
  display:block;
  padding:10px 10px;
  border-radius:12px;
  color:var(--text);
  text-decoration:none;
  border:1px solid transparent;
}

.sidebar nav a:hover{
  background:var(--panel2);
  border-color:var(--line);
}

.notes{
  margin-top:14px;
  padding:12px;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(17,28,51,.65);
}

.notes h3{margin:0 0 8px; font-size:14px}
.notes ul, .notes ol{margin:0; padding-left:18px; color:var(--muted); font-size:12px}
.notes li{margin:6px 0}

.muted{color:var(--muted); font-size:12px; margin-top:10px}

.content{min-width:0}

.project{
  border:1px solid var(--line);
  border-radius:18px;
  background:var(--panel);
  padding:14px;
  margin-bottom:14px;
}

.project h2{margin:0 0 8px}
.meta{
  display:flex; flex-wrap:wrap; gap:8px;
  color:var(--muted); font-size:12px;
  margin-bottom:10px;
}

.badge{
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--panel2);
}

.arch{
  width:100%;
  border:1px solid var(--line);
  border-radius:16px;
  background:#0b1220;
  margin:10px 0;
}

.section-title{
  margin:12px 0 6px;
  font-size:13px;
  color:var(--muted);
  text-transform:uppercase;
  letter-spacing:.08em;
}

.steps{
  display:grid;
  grid-template-columns: 1fr;
  gap:10px;
}

.step{
  display:grid;
  grid-template-columns: 64px 1fr;
  gap:12px;
  padding:12px;
  background:rgba(17,28,51,.75);
  border:1px solid var(--line);
  border-radius:16px;
}

.step img{width:64px;height:64px}
.step h4{margin:0 0 6px}
.step .body{color:var(--muted); font-size:13px; line-height:1.45}
.step code{color:#e5e7eb}
.step pre{
  margin:8px 0 0;
  background:#0b1220;
  border:1px solid var(--line);
  padding:10px;
  border-radius:12px;
  overflow:auto;
  color:#d1d5db;
  font-size:12px;
}

.refs{
  margin-top:10px;
  padding-top:10px;
  border-top:1px dashed var(--line);
}

.refs a{color:var(--accent); text-decoration:none}
.refs a:hover{text-decoration:underline}

.footer{color:var(--muted); font-size:12px; padding:16px 4px}

@media (max-width: 960px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:relative; top:0; height:auto}
}