/* EduQuant Kit — circuit designer: 3-panel layout, gate palette, SVG canvas */

/* ---------- Designer page layout (index.html) ---------- */
body.designer-page {
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.designer-layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--results-w);
  height: calc(100vh - var(--header-h));
  overflow: hidden;
}
.panel {
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: var(--surface);
}
.panel-scroll { flex: 1; min-height: 0; overflow: auto; }
.palette-panel { border-right: 1px solid var(--border); }
.canvas-panel { background: var(--bg); }
.results-panel { border-left: 1px solid var(--border); }

/* ---------- Controls bar ---------- */
.controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.controls-bar .ctrl { display: flex; align-items: center; gap: 8px; }
.controls-bar .ctrl > label { font-size: 12.5px; font-weight: 600; color: var(--text-secondary); }
.controls-bar .spacer { flex: 1; }

/* ---------- Canvas toolbar ---------- */
.canvas-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 12.5px;
  color: var(--text-secondary);
  flex-wrap: wrap;
}
.canvas-toolbar .stats { display: flex; gap: 14px; font-weight: 500; }
.canvas-toolbar .stats b { color: var(--text); }
.canvas-toolbar .spacer { flex: 1; }

.placement-status {
  min-height: 34px;
  margin: 0 16px;
  padding: 7px 12px;
  border-radius: var(--radius);
  background: #EAF2FB;
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}
.placement-status.idle { background: transparent; color: var(--text-secondary); font-weight: 400; }
.placement-status button { margin-left: auto; }

/* ---------- Circuit canvas ---------- */
.circuit-container {
  flex: 1;
  min-height: 0;
  margin: 10px 16px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: auto;
  position: relative;
  outline: none;
}
.circuit-container.placing { cursor: crosshair; box-shadow: 0 0 0 2px rgba(34,211,238,.5); }
.circuit-container svg { display: block; font-family: var(--font); user-select: none; }
.circuit-container .gate-group { cursor: pointer; }
.circuit-container .gate-group.dragging { opacity: .7; cursor: grabbing; }
.circuit-container .gate-hit { fill: transparent; stroke: transparent; }
.circuit-container .gate-group:hover .gate-hit { stroke: rgba(34,211,238,.6); stroke-width: 2; }
.circuit-container .gate-group.selected .gate-hit { stroke: var(--accent); stroke-width: 2.5; stroke-dasharray: 4 3; }
.circuit-container .wire-hit { fill: transparent; }
.circuit-container.placing .wire-hit:hover { fill: rgba(34,211,238,.12); }
.circuit-container.compact { margin: 8px 0 0; }

/* ---------- Control / target clarity (circuit.js) ---------- */
/* live summary under the canvas: "Circuit: H(q0) → CNOT(ctrl:q0, tgt:q1)" */
.circuit-summary {
  margin: -8px 16px 12px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 11px;
  color: #444;
  line-height: 1.5;
  overflow-wrap: anywhere;
}
.circuit-summary.compact { margin: 6px 0 0; }

/* hover tooltip on placed gates ("CNOT — Control: q0 · Target: q1"), shown after 500 ms */
.gate-tooltip {
  position: fixed;
  z-index: 1000;
  max-width: 320px;
  padding: 6px 10px;
  border-radius: 6px;
  background: #1E293B;
  color: #fff;
  font: 500 12px/1.4 var(--font);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity .12s;
}
.gate-tooltip.show { opacity: 1; visibility: visible; }

/* instruction banner under the palette while a multi-qubit gate is being placed */
.placement-banner {
  position: sticky;
  bottom: 8px;
  z-index: 2;
  margin: 8px 10px;
  padding: 8px 12px;
  background: #FEF3C7;
  border: 2px solid #F59E0B;
  border-radius: 6px;
  font-size: 12px;
  color: #1A1A1A;
  line-height: 1.5;
  box-shadow: var(--shadow-lg);
}
.placement-banner.hidden { display: none; }
.placement-banner .pb-title { font-weight: 700; margin-bottom: 2px; }
.placement-banner .pb-step { display: flex; align-items: baseline; gap: 6px; color: #6B5B2E; }
.placement-banner .pb-step.active { color: #1A1A1A; font-weight: 700; }
.placement-banner .pb-step.done { color: #6B7280; }
.placement-banner .pb-sym { flex: 0 0 14px; text-align: center; font-weight: 700; }
.placement-banner .pb-pick { margin-left: auto; color: #059669; font-weight: 600; white-space: nowrap; }
.placement-banner .pb-cancel { margin-top: 2px; color: #6B5B2E; font-style: italic; }

/* ---------- Gate palette ---------- */
.palette { padding: 8px 10px 16px; }
.palette-section { margin-bottom: 6px; }
.palette-section > .section-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 6px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--border);
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  cursor: pointer;
}
.palette-section > .section-head .ti { transition: transform .15s; }
.palette-section.collapsed > .section-head .ti { transform: rotate(-90deg); }
.palette-section > .section-body { padding: 8px 2px 4px; }
.palette-section.collapsed > .section-body { display: none; }
.gate-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.gate-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.gate-btn {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--radius);
  color: #fff;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform .1s, box-shadow .1s;
  padding: 0;
  min-height: 40px;
}
.gate-btn.wide { aspect-ratio: auto; font-size: 12.5px; padding: 8px 4px; }
.gate-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.gate-btn.pending { outline: 3px solid var(--accent); outline-offset: 1px; }
.gate-btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.palette-row { display: flex; align-items: center; gap: 8px; margin-top: 8px; font-size: 12.5px; }
.palette-row label { font-weight: 500; color: var(--text-secondary); white-space: nowrap; }
.palette-row input[type=text] { padding: 5px 8px; font-size: 12.5px; }
.angle-display {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-weight: 600;
  color: var(--primary);
  text-align: center;
  margin: 4px 0;
}
.palette-note { font-size: 11.5px; color: var(--text-secondary); margin-top: 6px; line-height: 1.4; }
.three-qubit-legend { margin-top: 8px; display: flex; gap: 8px; align-items: center; }
.three-qubit-legend svg { flex-shrink: 0; }
.palette-special {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  padding: 10px 12px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.palette-special .gate-btn { font-size: 11.5px; aspect-ratio: auto; padding: 8px 2px; min-height: 40px; display: flex; flex-direction: column; gap: 2px; }
.palette-special .gate-btn .ti { font-size: 16px; }

/* Compact (embedded) designer */
.designer-embed {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
  min-height: 360px;
}
.designer-embed .palette-panel { max-height: 520px; }
.designer-embed .canvas-panel { padding: 0 12px 12px; }
.designer-embed .gate-btn { min-height: 34px; font-size: 13px; }
.designer-embed .gate-grid { gap: 4px; }
.designer-embed .circuit-container { margin: 6px 0 0; min-height: 200px; }
.designer-embed .placement-status { margin: 6px 0 0; }
.designer-embed .canvas-toolbar { padding: 8px 0 0; }

/* ---------- Results panel ---------- */
.results-panel .result-summary { padding: 12px 14px; border-bottom: 1px solid var(--border); background: var(--bg); min-height: 44px; }
.results-panel .tab-panels { flex: 1; min-height: 0; overflow: auto; padding: 12px 14px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  body.designer-page { height: auto; overflow: auto; }
  .designer-layout {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
  }
  .palette-panel, .results-panel { border: 0; border-top: 1px solid var(--border); }
  .palette-panel { max-height: 420px; }
  .circuit-container { min-height: 280px; }
  .designer-embed { grid-template-columns: 1fr; }
  .designer-embed .palette-panel { max-height: 320px; }
}