/* Extra styles for the DLG section only. Loaded after assets/course.css. */
.demo canvas { display: block; border: 1px solid var(--border); border-radius: 8px; background: var(--surface-2); touch-action: none; }
.demo canvas.paint { cursor: crosshair; }
.demo .row { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-start; }
.demo .row > * { flex: 1 1 260px; min-width: 0; }
.demo textarea, .demo input[type="text"], .demo select {
  width: 100%; background: var(--code-bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px; font: 0.85rem var(--mono);
}
.demo select { width: auto; }
.demo .readout { font-family: var(--mono); font-size: 0.88em; line-height: 1.7; }
.demo .readout b { color: var(--sec); }
.demo .chart-box { position: relative; height: 300px; }
.demo .chart-box.tall { height: 340px; }
.legend-row { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 0.85em; color: var(--muted); margin: 6px 0; }
.legend-row i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 5px; vertical-align: -1px; }
.dc-a { background: #e63c3c; } .dc-b { background: #3cc85a; } .dc-c { background: #4682ff; } .dc-d { background: #f5be00; }
svg.diagram { width: 100%; height: auto; display: block; }
svg.diagram text { font: 12px var(--font); fill: var(--text); }
svg.diagram .muted { fill: var(--muted); }
svg.diagram .box { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
svg.diagram .enc { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; cursor: pointer; }
svg.diagram .dec { fill: var(--sec-soft); stroke: var(--sec); stroke-width: 1.5; cursor: pointer; }
svg.diagram .sel { stroke-width: 3.5; }
svg.diagram .skip { stroke: var(--sec); stroke-width: 2; stroke-dasharray: 5 4; fill: none; }
svg.diagram .skip.off { opacity: 0.12; }
svg.diagram .arrow { stroke: var(--muted); stroke-width: 1.8; fill: none; }
svg.diagram marker path { fill: var(--muted); }
.formula { overflow-x: auto; }
.small { font-size: 0.88em; color: var(--muted); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 2px 14px; font-size: 0.92em; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; font-family: var(--mono); }
.video-wrap video { width: 100%; border-radius: var(--radius); border: 1px solid var(--border); background: #000; }
.lesson-list a > span:not(.done-mark) { display: block; }
.lesson-list a strong { display: block; }
.demo canvas { height: auto; }