:root {
  --bg: #0a0a0a; --bg-raised: #141310; --ink: #e8e5de; --dim: #8a857c; --faint: #3a3632;
  --brass: #b8a47e; --brass-bright: #d4bd8f; --danger: #c4342a; --rule: #1f1c18; --panel: #0f0e0c;
  --sans: 'Inter', sans-serif; --mono: 'JetBrains Mono', monospace; --serif: 'Playfair Display', serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  background: var(--bg) repeating-linear-gradient(0deg, transparent 0 99px, rgba(184,164,126,0.02) 99px 100px);
  color: var(--ink); font-family: var(--sans);
  display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
nav {
  padding: 14px 24px; display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--faint); border-bottom: 1px solid var(--rule); background: var(--panel);
  flex-shrink: 0;
}
nav .brand { color: var(--brass); font-weight: 500; font-size: 11px; }
nav .brand em { color: var(--danger); font-style: normal; }
nav .status { color: var(--dim); }
nav .status::before {
  content: '●'; color: #4ade80; margin-right: 6px; animation: blip 1.8s infinite;
}
@keyframes blip { 50% { opacity: 0.3; } }

main {
  display: grid; grid-template-columns: 300px 1fr; flex: 1; min-height: 0;
}

aside {
  background: var(--panel); border-right: 1px solid var(--rule);
  display: flex; flex-direction: column; overflow: hidden;
}
.search-wrap { padding: 14px 16px; border-bottom: 1px solid var(--rule); }
.search-wrap input {
  width: 100%; padding: 8px 10px; background: #080706; border: 1px solid var(--rule);
  color: var(--ink); font-family: var(--mono); font-size: 12px; border-radius: 4px;
  outline: none; transition: border-color 0.15s;
}
.search-wrap input::placeholder { color: var(--faint); letter-spacing: 0.05em; }
.search-wrap input:focus { border-color: var(--brass); }

#tree { flex: 1; overflow-y: auto; padding: 12px 0 20px; }
.tree-group { margin-bottom: 14px; }
.tree-group-label {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.25em;
  color: var(--brass); padding: 6px 18px; margin-bottom: 4px;
}
.tree-group ul { list-style: none; }
.tree-item {
  display: block; padding: 6px 18px 6px 24px; color: var(--dim); text-decoration: none;
  font-size: 13px; font-family: var(--sans); letter-spacing: 0.01em;
  border-left: 2px solid transparent; transition: all 0.12s;
  text-transform: capitalize;
}
.tree-item:hover { color: var(--ink); background: rgba(184,164,126,0.04); }
.tree-item.active { color: var(--brass-bright); border-left-color: var(--danger); background: rgba(196,52,42,0.06); }
.tree-empty { padding: 20px; color: var(--faint); font-family: var(--mono); font-size: 11px; text-align: center; }

article {
  overflow-y: auto; padding: 32px 48px 60px; max-width: 880px;
  position: relative;
}
.proc-head {
  padding-bottom: 20px; margin-bottom: 28px; border-bottom: 1px solid var(--rule);
}
#procTitle {
  font-family: var(--serif); font-weight: 400; font-size: 40px; line-height: 1.1;
  color: var(--ink); margin-bottom: 8px; text-transform: capitalize;
}
#procMeta {
  font-family: var(--mono); font-size: 10.5px; color: var(--faint); letter-spacing: 0.15em;
}

#procBody {
  font-size: 15.5px; line-height: 1.75; color: var(--ink);
}
#procBody h1, #procBody h2, #procBody h3, #procBody h4 {
  font-family: var(--serif); font-weight: 400; color: var(--ink);
  margin: 32px 0 12px; letter-spacing: -0.01em;
}
#procBody h1 { font-size: 30px; border-bottom: 1px solid var(--rule); padding-bottom: 8px; }
#procBody h2 { font-size: 24px; color: var(--brass-bright); }
#procBody h3 { font-size: 19px; }
#procBody h4 { font-size: 16px; font-family: var(--mono); font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--brass); }
#procBody p { margin-bottom: 14px; }
#procBody a { color: var(--brass-bright); text-decoration: underline; text-underline-offset: 3px; }
#procBody a:hover { color: var(--danger); }
#procBody code {
  font-family: var(--mono); font-size: 13px; color: var(--brass-bright);
  background: #141310; padding: 2px 6px; border-radius: 3px;
}
#procBody pre {
  background: #080706; border: 1px solid var(--rule); border-left: 3px solid var(--brass);
  padding: 14px 18px; margin: 16px 0; overflow-x: auto; border-radius: 4px;
}
#procBody pre code {
  background: transparent; padding: 0; color: var(--ink);
  font-size: 12.5px; line-height: 1.6;
}
#procBody ul, #procBody ol { margin: 12px 0 14px 28px; }
#procBody li { margin-bottom: 6px; }
#procBody hr { border: none; border-top: 1px solid var(--rule); margin: 28px 0; }
#procBody strong { color: var(--brass-bright); font-weight: 600; }
#procBody em { color: var(--dim); font-style: italic; }

.loading, .err {
  padding: 24px; font-family: var(--mono); font-size: 13px; color: var(--dim);
  background: var(--panel); border: 1px solid var(--rule); border-radius: 4px;
}
.err { color: var(--danger); border-left: 3px solid var(--danger); }
.err code { display: inline-block; margin-top: 8px; font-size: 11px; color: var(--faint); }

footer {
  padding: 10px 24px; border-top: 1px solid var(--rule); background: var(--panel);
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 10px; color: var(--faint);
  letter-spacing: 0.1em; text-transform: uppercase; flex-shrink: 0;
}
footer a { color: var(--faint); text-decoration: none; }
footer a:hover { color: var(--brass); }

@media (max-width: 780px) {
  main { grid-template-columns: 1fr; grid-template-rows: 220px 1fr; }
  aside { border-right: none; border-bottom: 1px solid var(--rule); }
  article { padding: 20px 22px 40px; }
  #procTitle { font-size: 28px; }
}