/* ============================================================
   Порог яркости и гистограмма — интерактив для Практики 7.
   ============================================================ */
.pixel-threshold {
  margin: 24px 0; border: 1px solid var(--border); border-radius: 16px;
  background: var(--panel); box-shadow: var(--shadow); padding: 18px 20px 20px;
}
.pt-row { margin-bottom: 14px; }
.pt-row input[type="file"] {
  font-family: inherit; color: var(--text); background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 8px; padding: 7px 10px; font-size: 13.5px;
}
.pt-canvases { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.pt-canvas-wrap { text-align: center; }
.pt-canvas-wrap canvas {
  display: block; border-radius: 10px; border: 1px solid var(--border);
  background: var(--panel-2); max-width: 100%;
}
.pt-canvas-label { margin-top: 6px; font-size: 12.5px; color: var(--muted); }
.pt-tag { font-weight: 600; }
.pt-tag-keep { color: var(--accent-2); }
.pt-tag-drop { color: var(--muted); }

.pt-controls label {
  display: flex; justify-content: space-between; font-size: 13.5px; color: var(--muted);
  margin-bottom: 6px; font-family: ui-monospace, Consolas, monospace;
}
.pt-controls input[type="range"] { width: 100%; accent-color: var(--accent); }

.pt-hist {
  display: block; width: 100%; height: 110px; margin: 16px 0 6px;
  border-radius: 10px; border: 1px solid var(--border); background: var(--panel-2);
}
.pt-hint { margin: 8px 0 0; font-size: 13px; color: var(--muted); line-height: 1.5; }