:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef0f3;
  --border: #d8dce2;
  --text: #1f2328;
  --muted: #62707f;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --warn-bg: #fff6d6;
  --warn-border: #e5c451;
  --error-bg: #fde8e8;
  --error-border: #e57373;
  --editor-w: 380px;
  --panel-w: 460px;
  --toolbar-h: 44px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
:root[data-theme="dark"] {
  --bg: #15181d;
  --surface: #1d2127;
  --surface-2: #262b33;
  --border: #363c46;
  --text: #e6e9ee;
  --muted: #98a2b3;
  --accent: #60a5fa;
  --accent-text: #0b1220;
  --warn-bg: #3a3320;
  --warn-border: #a68a2b;
  --error-bg: #3d2323;
  --error-border: #b45f5f;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 var(--sans);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
button {
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
  line-height: 1.3;
}
button:hover { background: var(--surface-2); }
button[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button.quiet { background: transparent; border-color: transparent; color: var(--muted); }
button.quiet:hover { background: var(--surface-2); color: var(--text); }
[hidden] { display: none !important; }

/* Toolbar */
.toolbar {
  height: var(--toolbar-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex: none;
  overflow-x: auto;
  white-space: nowrap;
}
.brand { font-weight: 600; margin-right: 4px; }
.group { display: flex; align-items: center; gap: 6px; }
.group.zoom { margin-left: auto; }
#zoom-level { min-width: 56px; font-variant-numeric: tabular-nums; }

/* Layout */
.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: var(--editor-w) 6px 1fr auto;
}
body.editor-hidden .layout { grid-template-columns: 0 0 1fr auto; }
body.editor-hidden .editor-pane, body.editor-hidden .gutter { display: none; }

/* Explicit placement so hiding a pane never shifts the others into its column. */
.editor-pane { grid-column: 1; }
.gutter { grid-column: 2; }
.diagram-pane { grid-column: 3; }
.panel { grid-column: 4; }

.editor-pane { min-width: 0; border-right: 1px solid var(--border); background: var(--surface); }
#source {
  width: 100%;
  height: 100%;
  border: 0;
  resize: none;
  padding: 12px;
  background: transparent;
  color: var(--text);
  font: 12.5px/1.5 var(--mono);
  tab-size: 2;
  outline: none;
}
.gutter { cursor: col-resize; background: transparent; }
.gutter:hover, .gutter.active { background: var(--accent); opacity: 0.4; }

.diagram-pane { position: relative; min-width: 0; overflow: hidden; background: var(--bg); }
.diagram { position: absolute; inset: 0; }
.diagram-svg { position: absolute; inset: 0; }
.diagram svg { display: block; width: 100%; height: 100%; }

/* Warnings */
.warnings {
  position: absolute;
  top: 8px; left: 8px; right: 8px;
  z-index: 5;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: 6px;
  padding: 6px 32px 6px 10px;
  font-size: 12.5px;
}
.warnings.error { background: var(--error-bg); border-color: var(--error-border); }
.warnings ul { margin: 0; padding-left: 18px; }
.warnings .close { position: absolute; top: 3px; right: 4px; padding: 0 6px; border: 0; background: transparent; }

/* Share bar and account */
.share-bar {
  position: absolute;
  top: 8px; left: 8px; right: 8px;
  z-index: 5;
  display: flex;
  gap: 6px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 12.5px;
}
.share-bar input {
  flex: 1;
  min-width: 0;
  font: 12.5px var(--mono);
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 6px;
}
.share-bar .close { padding: 0 6px; border: 0; background: transparent; }
.whoami { color: var(--muted); font-size: 12px; max-width: 220px; overflow: hidden; text-overflow: ellipsis; }

.my-charts {
  width: min(560px, 92vw);
  max-height: 80vh;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}
.my-charts::backdrop { background: rgba(0, 0, 0, 0.35); }
.my-charts-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.my-charts-head .close { padding: 0 6px; border: 0; background: transparent; }
.my-charts-list { list-style: none; margin: 0; padding: 4px 0; max-height: 60vh; overflow: auto; }
.my-charts-list li { display: grid; grid-template-columns: 1fr auto auto; gap: 8px; align-items: center; padding: 6px 12px; }
.my-charts-list li:hover { background: var(--surface-2); }
.my-charts-list .title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.my-charts-list .date { color: var(--muted); font-size: 12px; margin-left: 8px; }
.my-charts-list button { padding: 2px 8px; font-size: 12px; }
.my-charts-empty { margin: 0; padding: 16px 12px; color: var(--muted); }

/* Message decorations inside the SVG */
.diagram svg .has-detail { cursor: pointer; }
.diagram svg text.has-detail { font-weight: 600; }
.diagram svg .dd-hit { fill: none; stroke: transparent; stroke-width: 16px; cursor: pointer; pointer-events: stroke; }
.diagram svg .dd-badge { cursor: pointer; }
.diagram svg .dd-badge rect { fill: var(--accent); }
.diagram svg .dd-badge text { fill: var(--accent-text); font: 600 10px var(--sans); pointer-events: none; }
.diagram svg .dd-selected.dd-badge rect { fill: #f59e0b; }
.diagram svg line.dd-selected, .diagram svg path.dd-selected { stroke: #f59e0b !important; stroke-width: 3px !important; }
.diagram svg text.dd-selected { fill: #d97706 !important; }

/* Tooltip and toast */
.tooltip {
  position: absolute;
  z-index: 6;
  max-width: 420px;
  background: var(--text);
  color: var(--bg);
  padding: 4px 8px;
  border-radius: 5px;
  font: 12px/1.4 var(--mono);
  pointer-events: none;
  white-space: pre;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toast {
  position: absolute;
  bottom: 14px; left: 50%;
  transform: translateX(-50%);
  z-index: 7;
  background: var(--text);
  color: var(--bg);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12.5px;
}

/* Detail panel */
.panel {
  position: relative;
  width: var(--panel-w);
  min-width: 0;
  max-width: 80vw;
  border-left: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
}
.panel-resize { position: absolute; left: -3px; top: 0; bottom: 0; width: 6px; cursor: col-resize; z-index: 2; }
.panel-resize:hover, .panel-resize.active { background: var(--accent); opacity: 0.4; }
.panel-head { padding: 10px 12px 8px; border-bottom: 1px solid var(--border); display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; }
.panel-title { color: var(--muted); font-size: 12px; }
.panel-num { font-weight: 600; margin-right: 6px; color: var(--text); }
.panel-label { grid-column: 1; font-weight: 600; word-break: break-word; }
.panel-actions { grid-column: 2; grid-row: 1 / span 2; display: flex; gap: 4px; align-items: start; }
.panel-actions button { padding: 2px 8px; }
.panel-tabs { display: flex; gap: 2px; padding: 6px 8px 0; border-bottom: 1px solid var(--border); overflow-x: auto; }
.panel-tabs button { border-radius: 6px 6px 0 0; border-bottom: 0; background: var(--surface-2); }
.panel-tabs button[aria-selected="true"] { background: var(--surface); font-weight: 600; position: relative; top: 1px; }
.panel-body { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.panel-tools { display: flex; gap: 6px; padding: 6px 8px; justify-content: flex-end; }
.panel-tools button { padding: 2px 8px; font-size: 12px; }
.panel-body pre { flex: 1; margin: 0; overflow: auto; padding: 0 12px 12px; font: 12.5px/1.5 var(--mono); }
.panel-body pre code { background: transparent !important; padding: 0 !important; white-space: pre; }
.panel-empty { padding: 16px; color: var(--muted); }

/* Print view */
body.print-mode .layout { grid-template-columns: 0 0 1fr 0; }
body.print-mode .editor-pane, body.print-mode .gutter, body.print-mode .panel { display: none; }
body.print-mode .diagram-pane { overflow: auto; }
body.print-mode .diagram, body.print-mode .diagram-svg { position: static; }
body.print-mode .diagram svg { width: auto; height: auto; max-width: 100%; margin: 12px auto; }
.print-details { padding: 12px 24px 40px; max-width: 1000px; margin: 0 auto; }
.print-details h2 { font-size: 16px; margin: 20px 0 8px; }
.print-details article { border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; margin-bottom: 12px; background: var(--surface); break-inside: avoid; }
.print-details article h3 { margin: 0 0 6px; font-size: 14px; }
.print-details article h3 .num { color: var(--muted); font-weight: 600; margin-right: 8px; }
.print-details h4 { margin: 10px 0 4px; font-size: 12.5px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.02em; }
.print-details pre { margin: 0; padding: 8px 10px; background: var(--surface-2); border-radius: 6px; overflow: auto; font: 12px/1.45 var(--mono); }

@media print {
  .toolbar, .editor-pane, .gutter, .panel, .tooltip, .toast, .warnings { display: none !important; }
  body { overflow: visible; }
  .layout { display: block; }
  .diagram-pane { overflow: visible; }
  .diagram, .diagram-svg { position: static; }
  .diagram svg { width: auto; height: auto; max-width: 100%; }
  .print-details { display: block !important; }
}

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: 40vh 6px 1fr; }
  .editor-pane { grid-column: 1; grid-row: 1; }
  .gutter { grid-column: 1; grid-row: 2; cursor: row-resize; }
  .diagram-pane { grid-column: 1; grid-row: 3; }
  body.editor-hidden .layout, body.print-mode .layout { grid-template-columns: 1fr; grid-template-rows: 0 0 1fr; }
  .panel { position: fixed; right: 0; top: var(--toolbar-h); bottom: 0; width: min(var(--panel-w), 100vw); z-index: 8; }
}