/* picture-language: SICP 2.2.4 painters-and-frames trace explorer. Reuses
   the site's :root tokens (--bg, --bg-content, --text, --text-secondary,
   --accent, --accent-light, --border, --code-bg) from style.css. */

#tool-root { font-size: 15px; }
#tool-root button, #tool-root input, #tool-root select, #tool-root textarea { font: inherit; }

.pl-controls {
    display: grid;
    grid-template-columns: 1.3fr 1fr 1fr;
    gap: 24px;
    align-items: start;
    margin: 1rem 0;
    padding: 1rem 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.pl-ctl label { display: block; font-weight: 600; margin-bottom: 6px; }
#pl-expr { width: 100%; font-family: monospace; padding: 6px 8px; border: 1px solid var(--border); border-radius: 4px; }
.pl-presets { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.pl-preset { border: 1px solid var(--border); background: transparent; border-radius: 14px; padding: 2px 10px; font-size: 13px; cursor: pointer; }
.pl-preset:hover { border-color: var(--accent); }
.pl-err { color: #c2413b; font-size: 13px; margin-top: 6px; }
#pl-prim, #pl-fcm { width: 100%; padding: 6px 8px; border: 1px solid var(--border); border-radius: 4px; }
.pl-fcm-warn { color: #c2413b; font-size: 12.5px; margin-top: 6px; }
.pl-prim-desc { color: var(--text-secondary); font-size: 13px; margin-top: 6px; }

.pl-work { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 16px; margin-top: 16px; }
.pl-panel { background: var(--bg-content); border: 1px solid var(--border); border-radius: 6px; padding: 14px 16px; min-width: 0; }
.pl-panel h2 { font-size: 14px; margin: 0 0 10px; }
.pl-side { display: grid; gap: 16px; align-content: start; min-width: 0; }

.pl-canvaswrap { position: relative; }
#pl-canvas { display: block; width: 100%; height: auto; aspect-ratio: 1 / 1; border: 1px solid var(--border); border-radius: 4px; background: var(--bg); cursor: default; touch-action: none; }
.pl-canvas-hint { color: var(--text-secondary); font-size: 12.5px; margin: 6px 0 0; }
.pl-frame-info { font: 12.5px/1.6 monospace; color: var(--text-secondary); margin-top: 8px; }
.pl-frame-info b { color: var(--text); font-weight: 600; }

.pl-transport { position: sticky; top: 0; z-index: 2; background: var(--bg); padding: 10px 0; border-bottom: 1px solid var(--border); margin-top: 8px; }
.pl-tbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.pl-tbar button { min-width: 34px; height: 30px; border: 1px solid var(--border); background: var(--bg-content); border-radius: 4px; cursor: pointer; padding: 0 8px; }
.pl-tbar button:hover { border-color: var(--accent); }
.pl-tbar .pl-play { min-width: 60px; background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
#pl-step-range { accent-color: var(--accent); }
.pl-steplabel { font: 13px monospace; color: var(--text-secondary); min-width: 12ch; text-align: right; }
.pl-speed { font-size: 13px; color: var(--text-secondary); display: inline-flex; align-items: center; gap: 6px; }
.pl-event { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border); min-height: 3em; font-size: 13.5px; }

.pl-code { font: 12.5px/1.65 monospace; margin: 0; background: var(--code-bg); padding: 8px; border-radius: 4px; overflow-x: auto; white-space: pre-wrap; }
.pl-code .pl-ln { display: block; padding: 0 6px; border-left: 3px solid transparent; white-space: pre-wrap; }
.pl-code .pl-ln.pl-hl { background: var(--accent-light); border-left-color: var(--accent); }
.pl-code .pl-ln.pl-bug { color: #c2413b; }

.pl-stack { list-style: none; margin: 0; padding: 0; font: 12.5px/1.6 monospace; }
.pl-stack li { padding: 2px 6px; border-left: 3px solid transparent; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pl-stack li.pl-top { border-left-color: var(--accent); background: var(--accent-light); }
.pl-stack li.pl-empty { color: var(--text-secondary); font-family: inherit; }

.pl-tests { margin-top: 16px; }
.pl-caption { color: var(--text-secondary); font-size: 13px; margin: 0 0 8px; max-width: 70ch; }
table.pl-testtable { border-collapse: collapse; width: 100%; font-size: 13.5px; }
table.pl-testtable th, table.pl-testtable td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--border); }
table.pl-testtable th { color: var(--text-secondary); font-weight: 600; font-size: 12.5px; }
.pl-pass { color: #178577; font-weight: 600; }
.pl-fail { color: #c2413b; font-weight: 600; }

@media (max-width: 900px) {
    .pl-controls { grid-template-columns: 1fr; gap: 16px; }
    .pl-work { grid-template-columns: 1fr; }
}