:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #6b7a8a;
  --line: #e2e8f0;
  --accent: #1a56db;
  --accent-soft: #eaf1fe;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
}

/* ---- header ---- */
.site-header {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 22px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.site-title { font-size: 19px; font-weight: 700; letter-spacing: 0.2px; }
.site-title em { color: var(--accent); font-style: normal; }
.site-sub { color: var(--muted); font-size: 13px; }

/* ---- revision picker ---- */
.ref-picker-wrap {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.ref-picker-label {
  font-size: 11.5px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.ref-picker {
  font-family: var(--sans);
  font-size: 13px;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  max-width: 340px;
}
.ref-picker-note {
  font-size: 11px;
  color: var(--muted);
}
.ref-picker-note code {
  font-size: 10.5px;
  padding: 0 3px;
}
@media (max-width: 900px) {
  .ref-picker-wrap { flex-wrap: wrap; }
  .ref-picker-note { flex-basis: 100%; text-align: right; }
}

/* ---- layout ---- */
.layout {
  display: grid;
  grid-template-columns: 330px 6px 1fr;
  align-items: start;
  gap: 18px;
  max-width: 1500px;
  margin: 18px auto;
  padding: 0 18px;
}

/* ---- tree resizer ---- */
.tree-resizer {
  cursor: col-resize;
  align-self: stretch;
  border-radius: 3px;
  background: transparent;
  transition: background 0.15s ease;
  min-height: 60vh;
}
.tree-resizer:hover,
.tree-resizer.dragging {
  background: var(--accent);
  opacity: 0.35;
}

/* ---- tree pane ---- */
.tree-pane {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  max-height: calc(100vh - 120px);
  overflow: auto;
  position: sticky;
  top: 18px;
}
.tree-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
  margin: 0 0 10px 4px;
}
.tree-pane ul { list-style: none; margin: 0; padding: 0 0 0 14px; }
.tree-pane > ul { padding-left: 0; }
.tree-pane details > summary { cursor: pointer; }
.tree-node { padding: 2px 0; font-size: 13.5px; white-space: nowrap; }
.tree-node a { color: var(--ink); text-decoration: none; }
.tree-node a:hover { color: var(--accent); text-decoration: underline; }
.tree-node.active > a, .tree-node.active > summary a { color: var(--accent); font-weight: 600; }
.tree-icon { display: inline-block; width: 16px; height: 16px; vertical-align: -3px; margin-right: 5px; }
.tree-icon svg { width: 16px; height: 16px; }
.tree-meta { color: var(--muted); font-size: 11px; margin-left: 6px; }
.tree-label { color: var(--muted); }

/* ---- content pane ---- */
.content-pane { min-width: 0; }
.breadcrumb {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 14px;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--muted);
}
.breadcrumb a { color: var(--accent); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 22px;
  margin-bottom: 16px;
}
.card h1 { margin: 0 0 6px; font-size: 21px; }
.card h2 { margin: 0 0 10px; font-size: 17px; }
.card p { margin: 6px 0; }
.muted { color: var(--muted); font-size: 13px; }
code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: #f1f5f9;
  border-radius: 4px;
  padding: 1px 5px;
}

/* stats on index */
.stats { display: flex; gap: 12px; margin-top: 14px; flex-wrap: wrap; }
.stat {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 16px;
  text-align: center;
  min-width: 92px;
}
.stat-n { display: block; font-size: 22px; font-weight: 700; color: var(--accent); }
.stat-k { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--muted); }

/* kind badges */
.kind-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: lowercase;
  border-radius: 4px;
  padding: 1px 7px;
  margin-right: 8px;
  background: #eef2f7;
  color: #44546a;
  border: 1px solid #d7dfe9;
  vertical-align: 1px;
}
.view-badge { background: #e8f5e9; color: #2e7d32; border-color: #c8e6c9; }

/* meta tables */
.meta-table { border-collapse: collapse; width: 100%; margin: 8px 0 4px; }
.meta-table th {
  text-align: left;
  width: 130px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
  padding: 4px 10px 4px 0;
  vertical-align: top;
  white-space: nowrap;
}
.meta-table td { padding: 4px 0; vertical-align: top; }

/* doc blocks */
.doc-block {
  background: #fafbfc;
  border-left: 3px solid #c9d6e8;
  border-radius: 0 6px 6px 0;
  padding: 8px 12px;
  margin: 10px 0;
  color: #3d4b5c;
  font-size: 13.5px;
}
.doc-block h4 { margin: 0 0 4px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--muted); }
.doc-block p { margin: 0; white-space: pre-wrap; }

/* diagrams */
.diagram-frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  margin-top: 10px;
  overflow: hidden;
}
.diagram-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 10px;
  border-bottom: 1px solid var(--line);
  background: #f8fafc;
  border-radius: 8px 8px 0 0;
}
.diagram-toolbar-file {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.diagram-fs-btn {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 6px;
  padding: 2px 10px;
  font-size: 12px;
  font-family: var(--sans);
  cursor: pointer;
  white-space: nowrap;
}
.diagram-fs-btn:hover { border-color: var(--accent); color: var(--accent); }
.diagram-scroll { overflow: auto; padding: 10px; }

/* fullscreen diagram overlay */
.diagram-frame.fullscreen {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  margin: 0;
  border: none;
  border-radius: 0;
  background: #fff;
}
.diagram-frame.fullscreen .diagram-toolbar {
  flex: 0 0 auto;
  border-radius: 0;
  padding: 8px 14px;
}
.diagram-frame.fullscreen .diagram-scroll {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.diagram-frame.fullscreen .diagram-scroll svg {
  width: 100%;
  height: 100%;
}
.diagram-image { display: block; max-width: 100%; height: auto; }
.diagram-missing {
  background: #fff8e6;
  border: 1px solid #f0d48a;
  border-radius: 8px;
  padding: 10px 14px;
  margin-top: 10px;
  color: #6b5310;
  font-size: 13.5px;
}

/* members (removed: file pages show the highlighted source instead) */

/* toc pages */
.toc-list { list-style: none; margin: 8px 0; padding: 0; }
.toc-list li { padding: 5px 0; border-bottom: 1px dashed var(--line); }
.toc-list a { color: var(--accent); text-decoration: none; }
.toc-list a:hover { text-decoration: underline; }
.toc-list .tree-icon { vertical-align: -3px; }

/* welcome */
.welcome h1 { margin-bottom: 10px; }

/* source link */
.source-link {
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  margin-left: 8px;
}
.source-link:hover { text-decoration: underline; }

/* hover enrichment */
.diagram-frame.interactive svg { display: block; max-width: 100%; height: auto; }
.diagram-frame.interactive text { cursor: default; }
.diagram-frame.interactive text.tip-hit { cursor: pointer; }
.diagram-frame.interactive text.tip-hit:hover {
  filter: drop-shadow(0 0 3px rgba(26, 86, 219, 0.9));
}
.viewer-tooltip {
  position: fixed;
  z-index: 3000;  /* above the fullscreen diagram overlay (2000) */
  pointer-events: none;
  min-width: 200px;
  max-width: 430px;
  overflow-wrap: break-word;
  word-break: break-word;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.16);
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.45;
}
.tip-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: lowercase;
  border-radius: 4px;
  padding: 1px 6px;
  background: #eef2f7;
  color: #44546a;
  border: 1px solid #d7dfe9;
  vertical-align: 1px;
}
.tip-name {
  font-family: var(--mono);
  font-weight: 600;
  margin-left: 7px;
  color: var(--ink);
}
.tip-doc {
  margin-top: 5px;
  color: #3d4b5c;
  white-space: pre-wrap;
  max-height: 130px;
  overflow: hidden;
}
.tip-src {
  margin-top: 5px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  overflow-wrap: anywhere;
}
.tip-hint {
  margin-top: 5px;
  color: var(--accent);
  font-size: 11px;
  font-style: italic;
}

/* revision build progress overlay */
.viewer-busy {
  position: fixed;
  inset: 0;
  z-index: 4000;
  background: rgba(244, 246, 249, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
}
.viewer-busy-box {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 24px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.15);
  font-size: 14px;
  color: var(--ink);
}
.viewer-busy-spin {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  animation: viewer-busy-spin 0.8s linear infinite;
}
@keyframes viewer-busy-spin {
  to { transform: rotate(360deg); }
}

/* source view */
.source-view {
  margin: 0;
  padding: 12px 14px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.2;
}
.src-line { display: block; white-space: pre; line-height: 1.2; }
.src-line:hover { background: #f0f4fa; }
.src-ln {
  display: inline-block;
  width: 3.2em;
  text-align: right;
  margin-right: 1em;
  color: #9aa7b4;
  user-select: none;
}
.src-cmt { color: #6a9955; }
.src-str { color: #a31515; }
.src-kw { color: #0000cc; }
.src-num { color: #098658; }
.src-op { color: #af00db; }

/* source references: identifiers that resolve to model elements */
.src-ref {
  color: inherit;
  text-decoration: underline dotted #93a8c8;
  text-underline-offset: 2px;
  cursor: pointer;
}
.src-ref:hover { color: var(--accent); background: var(--accent-soft); }
.src-ref.tip-hit { background: var(--accent-soft); }

/* responsive */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .tree-pane { position: static; max-height: 320px; }
  .tree-resizer { display: none; }
}