:root {
  --bg: #faf7f2;
  --surface: #ffffff;
  --text: #2b241c;
  --text-muted: #6f6455;
  --border: #e4dccc;
  --accent: #a6532c;
  --accent-soft: #f0dcc9;
  --citta-color: #6b4ea0;
  --citta-soft: #e6def2;
  --cetasika-color: #2c7a5b;
  --cetasika-soft: #d9ede2;
  --rupa-cause-color: #2c6e8a;
  --rupa-cause-soft: #d9e9f0;
  --dim-opacity: 0.25;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1712;
    --surface: #262019;
    --text: #ece4d8;
    --text-muted: #a99f8e;
    --border: #3c3327;
    --accent: #d98a5e;
    --accent-soft: #4a3626;
    --citta-color: #b79ce0;
    --citta-soft: #3a3050;
    --cetasika-color: #7fd3ac;
    --cetasika-soft: #234236;
    --rupa-cause-color: #7ec3e0;
    --rupa-cause-soft: #223c48;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans Thai", ui-sans-serif, system-ui, sans-serif;
  line-height: 1.5;
}

.site-header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}
.site-header h1 { margin: 0 0 0.25rem; font-size: 1.8rem; }
.subtitle { margin: 0; color: var(--text-muted); }
.site-nav-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
}
.site-nav-link:hover { text-decoration: underline; }

.mode-switch {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0 1rem 1.5rem;
}
.mode-btn {
  font-family: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.6rem 1.2rem;
  font-size: 0.95rem;
  color: var(--text);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}
.mode-btn .mode-hint { font-size: 0.72rem; color: var(--text-muted); }
.mode-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.mode-btn.active .mode-hint { color: #fff; opacity: 0.85; }

.lens-overlay[hidden] { display: none; }
.lens-overlay {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0 1rem 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.lens-overlay select, .lens-overlay button {
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
}
.lens-overlay button:not(:disabled) { cursor: pointer; }

main {
  display: grid;
  grid-template-columns: 1.4fr 280px 1fr;
  gap: 1rem;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
  align-items: start;
}
@media (max-width: 860px) {
  main { grid-template-columns: 1fr; }
  .info-panel { order: -1; position: static; }
  #cetasika-panel { position: static; max-height: none; overflow-y: visible; }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}
.panel h2 { margin: 0 0 0.75rem; font-size: 1.1rem; }
.panel-count { font-weight: normal; color: var(--text-muted); font-size: 0.85rem; }

.citta-group, .cetasika-group { margin-bottom: 1rem; }
.group-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 0.4rem;
}
.circle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.circle-row + .circle-row {
  margin-top: 0.5rem;
}

.node {
  --node-color: var(--citta-color);
  --node-soft: var(--citta-soft);
  width: 3.4rem;
  height: 3.4rem;
  border-radius: 50%;
  border: 2px solid var(--node-color);
  background: var(--node-soft);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.72rem;
  line-height: 1.1;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease, background 0.15s ease;
  padding: 0.2rem;
}
.node.cetasika { --node-color: var(--cetasika-color); --node-soft: var(--cetasika-soft); }

.node:hover { transform: scale(1.08); }

.node.is-dim { opacity: var(--dim-opacity); }
.node.is-related {
  background: var(--node-color);
  color: #fff;
}
.node.is-selected {
  background: var(--node-color);
  color: #fff;
  box-shadow: 0 0 0 3px var(--node-soft), 0 0 0 5px var(--node-color);
}

/* จำแนกนัย overlay: layered on top of whichever mode is active, independent of
   is-dim/is-related/is-selected (see #lens-overlay in index.html). */
.node.lens-match { box-shadow: 0 0 0 3px var(--accent); }
.node.lens-nomatch { opacity: var(--dim-opacity); }

/* นิยตโยคี/อนิยตโยคี overlay: a second, independent overlay (see #combo-overlay
   in index.html) -- dashed outline instead of solid, so it stays visually
   distinct if both overlays happen to be active on the same cetasika node. */
.node.combo-match { outline: 3px dashed var(--accent); outline-offset: 2px; }
.node.combo-nomatch { opacity: var(--dim-opacity); }

.info-footnote {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  border-top: 1px dashed var(--border);
  padding-top: 0.5rem;
}
.info-footnote summary {
  cursor: pointer;
  color: var(--accent);
}
.info-footnote p { margin: 0.4rem 0 0; color: var(--text-muted); }

.info-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  min-height: 8rem;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}

#cetasika-panel {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}
.info-placeholder { color: var(--text-muted); font-size: 0.9rem; margin: 0; }
.info-title { margin: 0 0 0.3rem; font-size: 1.1rem; }
.info-pali { margin: 0 0 0.6rem; color: var(--text-muted); font-size: 0.85rem; font-style: italic; }
.info-meaning { margin: 0 0 0.75rem; font-size: 0.9rem; }
.info-related-label { font-size: 0.8rem; color: var(--text-muted); margin: 0 0 0.3rem; }
.info-related-list { margin: 0; padding-left: 1.1rem; font-size: 0.88rem; }
.info-related-list li { margin-bottom: 0.15rem; }
.info-related-sublist {
  margin: 0.2rem 0 0.3rem;
  padding-left: 1.1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.info-related-sublist li { margin-bottom: 0.1rem; }

.panel.inactive-panel h2 { color: var(--text-muted); }

.site-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 1rem;
}

#ink-canvas {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 900;
  pointer-events: none;
  touch-action: none;
}
#ink-canvas.drawing {
  pointer-events: auto;
  cursor: crosshair;
}

.ink-toolbar {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}
.ink-visibility-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  font-family: inherit;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
}

.ink-panel {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}
.ink-panel[hidden] {
  display: none;
}

.ink-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
}
.ink-toggle.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.ink-tools {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.6rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
}
.ink-tools[hidden], .ink-colors[hidden] {
  display: none;
}
.ink-tool-tabs {
  display: flex;
  gap: 0.4rem;
}
.ink-tool-tab {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}
.ink-tool-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.ink-color-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.8rem;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
}
.ink-color-toggle.active {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.ink-colors {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.ink-color {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--c);
  cursor: pointer;
  padding: 0;
}
.ink-color.active {
  border: 2px solid var(--text);
  box-shadow: 0 0 0 2px var(--surface);
}