:root {
  --bg:         #0e0e0e;
  --bg-surface: #1a1818;
  --bg-input:   #080808;
  --border:     #2a2828;
  --fg:         #e8e4e2;
  --fg-dim:     #a09898;
  --accent:     #9d2235;
  --link:       #ef8f99;
  --warning:    #e8c06a;
  --font-mono:  "JetBrains Mono", "Fira Mono", "Courier New", monospace;
  --font-sans:  -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

#sidebar-state { display: none; }

/* Topbar */
#topbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

#sidebar-toggle {
  display: none;
  cursor: pointer;
  color: var(--fg-dim);
  font-size: 16px;
  padding: 4px 6px;
}
#sidebar-toggle:hover { color: var(--fg); }

#logo {
  font-weight: bold;
  font-size: 16px;
  color: var(--fg);
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 8px;
}
#logo span { text-transform: uppercase; }
#logo:hover { color: var(--accent); text-decoration: none; }
.topbar-logo {
  height: 36px;
  width: 44px;
  object-fit: contain;
  flex-shrink: 0;
}

#nav {
  display: flex;
  gap: 16px;
  overflow-x: auto;
}
#nav a {
  color: var(--fg-dim);
  padding: 10px 0 8px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
#nav a:hover, #nav a.active { color: var(--fg); text-decoration: none; }
#nav a.active { border-bottom-color: var(--accent); }

/* Frame */
#layout {
  flex: 1;
  display: flex;
  min-height: 0;
}

/* Sidebar */
#sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px 8px;
  font-size: 13px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
#sidebar::-webkit-scrollbar { width: 8px; }
#sidebar::-webkit-scrollbar-thumb { background: var(--border); }
#sidebar::-webkit-scrollbar-track { background: transparent; }

.tree, .tree ul { list-style: none; }
.tree ul { padding-left: 14px; }
.tree li { margin: 1px 0; }
.tree a {
  display: block;
  color: var(--fg-dim);
  padding: 3px 8px;
  border-radius: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tree a:hover { color: var(--fg); background: var(--bg-input); text-decoration: none; }
.tree a.active { color: var(--link); background: var(--bg-input); }
.tree > li.tree-branch { margin-top: 12px; }
.tree > li.tree-branch > a { font-weight: bold; color: var(--fg); }
.tree .tree-branch .tree-branch > a { font-weight: bold; }

/* Content */
#content {
  flex: 1;
  overflow-y: auto;
  padding: 32px 32px 64px;
}

.doc, .pagenav {
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
}
.doc {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
}

.doc a:hover { color: var(--fg); }

.doc .lightbox { cursor: zoom-in; }
.doc .lightbox-state { display: none; }
.doc .lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.85);
  align-items: center;
  justify-content: center;
  padding: 32px;
  cursor: zoom-out;
}
.doc .lightbox-state:checked ~ .lightbox-overlay { display: flex; }
.doc .lightbox-overlay img {
  max-width: 100%;
  max-height: 100%;
  border: 1px solid var(--border);
  border-radius: 3px;
}

.doc h1, .doc h2, .doc h3, .doc h4 { font-family: var(--font-mono); line-height: 1.4; }
.doc h1 {
  font-size: 22px;
  letter-spacing: 1px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.doc h2 {
  font-size: 17px;
  margin: 36px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.doc h3 { font-size: 15px; margin: 28px 0 10px; }
.doc h4 { font-size: 14px; margin: 22px 0 8px; color: var(--fg-dim); }

.doc p, .doc ul, .doc ol, .doc table, .doc pre, .doc blockquote { margin-bottom: 14px; }
.doc ul, .doc ol { padding-left: 26px; }
.doc li { margin: 4px 0; }
.doc li > ul, .doc li > ol { margin-bottom: 0; }

.doc blockquote {
  border-left: 3px solid var(--accent);
  background: var(--bg-surface);
  border-radius: 0 3px 3px 0;
  padding: 10px 14px;
  color: var(--fg);
}
.doc blockquote p:last-child { margin-bottom: 0; }

.doc code {
  font-family: var(--font-mono);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 0.88em;
}
.doc pre {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 12px 14px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}
.doc pre code { background: none; border: none; padding: 0; font-size: inherit; }
.doc .highlight pre { background: var(--bg-input) !important; }

.doc table {
  border-collapse: collapse;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}
.doc th, .doc td {
  border: 1px solid var(--border);
  padding: 6px 12px;
  text-align: left;
  white-space: nowrap;
}
.doc td { white-space: normal; }
.doc th { background: var(--bg-surface); }

.doc img {
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 3px;
}

.doc hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* Prev / next */
.pagenav {
  margin-top: 32px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
}

/* Footer */
#footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 4px 16px;
  font-size: 11px;
  color: var(--fg-dim);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

/* Mobile */
@media (max-width: 800px) {
  #sidebar-toggle { display: block; }
  #sidebar { display: none; }
  #sidebar-state:checked ~ #layout #sidebar {
    display: block;
    position: absolute;
    top: 42px;
    bottom: 0;
    left: 0;
    z-index: 50;
    box-shadow: 4px 0 12px rgba(0, 0, 0, 0.5);
  }
  #content { padding: 16px; }
  #nav { gap: 12px; }
}