/* ============================================================
   Площадка операторов свёртки — интерактив Лекции 4.
   ============================================================ */
.conv-lab {
  margin: 24px 0; border: 1px solid var(--border); border-radius: 16px;
  background: var(--panel); box-shadow: var(--shadow); overflow: hidden;
}
.cl-head { padding: 16px 20px 12px; border-bottom: 1px solid var(--border); background: var(--panel-2); }
.cl-head h4 { margin: 8px 0 6px; font-size: 17px; color: var(--text); }
.cl-head p { margin: 0; color: var(--muted); font-size: 14px; }

.cl-body { padding: 18px 20px 22px; display: flex; gap: 24px; flex-wrap: wrap; align-items: flex-start; }
.cl-canvases { display: flex; gap: 14px; flex-wrap: wrap; }
.cl-canvas-wrap { text-align: center; }
.cl-canvas-wrap canvas {
  width: 200px; height: 200px; border-radius: 10px; border: 1px solid var(--border);
  display: block; image-rendering: pixelated;
}
.cl-canvas-label { margin-top: 6px; font-size: 12.5px; color: var(--muted); }

.cl-controls { flex: 1 1 240px; min-width: 240px; }
.cl-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.cl-buttons button {
  padding: 7px 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--panel-2);
  color: var(--text); font-size: 13.5px; cursor: pointer;
}
.cl-buttons button:hover { border-color: var(--accent); }
.cl-buttons button.active { border-color: var(--accent); color: var(--accent); font-weight: 700; }

.cl-kernel { margin-top: 14px; min-height: 20px; }
.cl-matrix {
  display: inline-grid; gap: 2px; font-family: ui-monospace, Consolas, monospace; font-size: 13px;
}
.cl-matrix span {
  width: 30px; height: 26px; display: flex; align-items: center; justify-content: center;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 4px; color: var(--accent-2);
}
.cl-note { margin-top: 12px; font-size: 13px; color: var(--muted); }