:root[data-theme="dark"] {
  --bg: #14161a;
  --bg-elevated: #1b1e24;
  --bg-panel: #1b1e24;
  --border: #2b2f38;
  --text: #e6e6e6;
  --text-muted: #9aa1ab;
  --accent: #7c9cff;
  --chip-bg: #262b34;
  --graph-bg: #101215;
  --edge: #3a4050;
  --edge-ghost: #3a4050;
  --shadow: 0 8px 30px rgba(0,0,0,0.45);
}

:root[data-theme="light"] {
  --bg: #f5f6f8;
  --bg-elevated: #ffffff;
  --bg-panel: #ffffff;
  --border: #dde1e7;
  --text: #1c1f24;
  --text-muted: #5b6470;
  --accent: #3763e0;
  --chip-bg: #eef0f4;
  --graph-bg: #eceef2;
  --edge: #c3c9d3;
  --edge-ghost: #c3c9d3;
  --shadow: 0 8px 24px rgba(20,20,30,0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f5f6f8;
    --bg-elevated: #ffffff;
    --border: #dde1e7;
    --text: #1c1f24;
    --text-muted: #5b6470;
    --accent: #3763e0;
    --chip-bg: #eef0f4;
    --graph-bg: #eceef2;
    --edge: #c3c9d3;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.hidden { display: none !important; }

/* ---- Start screen ---- */
#start-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.start-card {
  max-width: 560px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  box-shadow: var(--shadow);
}
.start-card h1 { margin-top: 0; }
.start-actions { display: flex; flex-direction: column; gap: 10px; margin: 20px 0; }
.hint { font-size: 12.5px; color: var(--text-muted); line-height: 1.5; }

.btn-primary, .btn-secondary, .btn-block {
  border: 1px solid var(--border);
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
}
.btn-secondary { background: var(--chip-bg); color: var(--text); }
.btn-block { width: 100%; margin-top: 16px; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---- App shell layout ---- */
#app-shell {
  height: 100vh;
  display: grid;
  grid-template-columns: 240px 1fr 260px;
  grid-template-rows: 52px 1fr;
  grid-template-areas:
    "topbar topbar topbar"
    "filters graph metrics";
}

#topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}
.brand { font-weight: 600; white-space: nowrap; }
#search-input {
  flex: 1;
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 13px;
}
.badge { font-size: 12px; color: var(--text-muted); white-space: nowrap; }
.auto-status { font-size: 11px; color: var(--text-muted); max-width: 220px; }
#topbar button {
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

#filters-panel {
  grid-area: filters;
  border-right: 1px solid var(--border);
  background: var(--bg-panel);
  padding: 14px;
  overflow-y: auto;
}
#filters-panel h3 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; color: var(--text-muted); }
.filter-label { display: block; font-size: 11.5px; color: var(--text-muted); margin: 10px 0 4px; }
#filters-panel select, #filters-panel input[type="date"] {
  width: 100%;
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 12.5px;
}
.tag-filters { display: flex; flex-direction: column; gap: 4px; max-height: 180px; overflow-y: auto; margin-top: 4px; }
.tag-filter-item { display: flex; align-items: center; gap: 6px; font-size: 12.5px; }
.tag-filter-item .freq { margin-left: auto; color: var(--text-muted); font-size: 11px; }

.legend { margin-top: 18px; border-top: 1px solid var(--border); padding-top: 10px; font-size: 12px; }
.legend-item { display: flex; align-items: center; gap: 6px; margin-bottom: 6px; color: var(--text-muted); }
.legend-swatch { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.legend-line { width: 16px; height: 0; border-top: 1px solid var(--edge); display: inline-block; }

#graph-area {
  grid-area: graph;
  position: relative;
  background: var(--graph-bg);
  overflow: hidden;
}
#graph-svg { width: 100%; height: 100%; cursor: grab; }
#graph-svg:active { cursor: grabbing; }

.minimap {
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 160px;
  height: 120px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.minimap-viewport { fill: rgba(124,156,255,0.15); stroke: var(--accent); stroke-width: 1.5; }

.node circle { stroke: var(--bg-elevated); stroke-width: 1.5px; transition: opacity .15s; }
.node { cursor: pointer; }
.node-label {
  fill: var(--text);
  font-size: 10.5px;
  paint-order: stroke;
  stroke: var(--bg-graph, var(--graph-bg));
  stroke-width: 3px;
}
.node.node-ghost circle { stroke-dasharray: 2 2; }
.node.node-ghost .node-label { fill: var(--text-muted); font-style: italic; }
.node.dimmed { opacity: 0.12; }
.edge { stroke: var(--edge); stroke-width: 1; }
.edge-ghost { stroke-dasharray: 3 3; }
.edge.dimmed { opacity: 0.06; }
circle.pulse {
  animation: pulse 0.9s ease-out;
}
@keyframes pulse {
  0% { r: 10; filter: drop-shadow(0 0 0px var(--accent)); }
  50% { r: 18; filter: drop-shadow(0 0 8px var(--accent)); }
  100% { r: 10; filter: drop-shadow(0 0 0px var(--accent)); }
}

.metrics-panel {
  grid-area: metrics;
  border-left: 1px solid var(--border);
  background: var(--bg-panel);
  padding: 14px;
  overflow-y: auto;
  font-size: 12.5px;
}
.metrics-panel h3 { margin: 0 0 10px; font-size: 13px; text-transform: uppercase; color: var(--text-muted); }
.metrics-panel h4 { margin: 14px 0 6px; font-size: 12px; color: var(--text-muted); }
.metric-row { display: flex; justify-content: space-between; padding: 3px 0; }
.metric-list { list-style: none; margin: 0; padding: 0; }
.metric-list li { display: flex; justify-content: space-between; padding: 4px 2px; border-radius: 6px; cursor: pointer; }
.metric-list li:hover { background: var(--chip-bg); }
.metric-list .freq { color: var(--text-muted); }

/* ---- Sidebar ---- */
#sidebar {
  position: fixed;
  top: 52px;
  right: -380px;
  width: 360px;
  height: calc(100vh - 52px);
  background: var(--bg-elevated);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: right .2s ease;
  z-index: 20;
  padding: 20px;
  overflow-y: auto;
}
#sidebar.open { right: 0; }
#sidebar-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  padding: 4px 8px;
}
#sidebar-content h2 { margin: 0 30px 12px 0; }
#sidebar-content h4 { margin: 16px 0 6px; font-size: 12px; text-transform: uppercase; color: var(--text-muted); }
.meta-row { display: flex; justify-content: space-between; font-size: 13px; padding: 3px 0; border-bottom: 1px dashed var(--border); }
.summary { font-size: 13px; line-height: 1.5; color: var(--text-muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  background: var(--chip-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 12px;
}
.chip.link-chip { cursor: pointer; color: var(--accent); }
.chip.link-chip:hover { text-decoration: underline; }
.muted { color: var(--text-muted); }

/* ---- Modal ---- */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 30;
  align-items: center;
  justify-content: center;
}
.modal.open { display: flex; }
.modal-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: min(720px, 90vw);
  max-height: 82vh;
  overflow-y: auto;
  padding: 24px;
  position: relative;
  box-shadow: var(--shadow);
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  padding: 4px 8px;
}
.modal-tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tab-btn {
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12.5px;
}
.tab-btn.active { color: var(--text); border-color: var(--accent); }
.tab-pane pre { white-space: pre-wrap; word-break: break-word; font-size: 12.5px; }
.tab-pane .wikilink { color: var(--accent); cursor: pointer; }
.tab-pane .wikilink:hover { text-decoration: underline; }
.tab-pane .tag-chip { background: var(--chip-bg); border-radius: 6px; padding: 1px 5px; font-size: 12px; }
.tab-pane code { background: var(--chip-bg); padding: 1px 5px; border-radius: 4px; }
.tab-pane pre code { padding: 0; }