/* ============================================================
   Station 7 — Quantum Circuit Builder Styles
   Artistic Indie Theme: Dark cinematic with warm accents
   ============================================================ */

/* ── CSS Variables (for this page) ── */
:root {
  --circuit-bg-deep: #0B0D14;
  --circuit-bg-card: #1A1B24;
  --circuit-coral: #E87979;
  --circuit-gold: #D4A574;
  --circuit-purple: #8B6BAE;
  --circuit-text: #E6E2DC;
  --circuit-text-secondary: #A8A5A0;
  --circuit-border: #2A2B34;
  --circuit-radius-lg: 20px;
  --circuit-radius-md: 14px;
  --circuit-radius-sm: 8px;
}

/* ── Circuit Page Layout ── */
#circuitPage {
  padding: 0 clamp(16px, 3vw, 32px) 40px;
}

.circuit-page-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.circuit-header {
  text-align: center;
  margin-bottom: 32px;
  padding: 32px 20px;
  background: var(--circuit-bg-deep);
  border-radius: var(--circuit-radius-lg);
  border: 1px solid var(--circuit-border);
}

.circuit-header-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 3px;
  color: var(--circuit-gold);
  margin-bottom: 10px;
}

.circuit-header-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: var(--circuit-text);
  margin-bottom: 12px;
  background: linear-gradient(125deg, var(--circuit-coral), var(--circuit-gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.circuit-header-desc {
  color: var(--circuit-text-secondary);
  max-width: 600px;
  margin: 0 auto 16px;
  line-height: 1.8;
  font-size: 1rem;
}

.circuit-objective {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: rgba(212, 165, 116, 0.15);
  border: 1px solid rgba(212, 165, 116, 0.35);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--circuit-gold);
}

.circuit-objective strong {
  font-family: 'JetBrains Mono', monospace;
  color: var(--circuit-coral);
}

/* ── Main circuit builder layout ── */
.circuit-builder {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

/* ── Gate Palette ── */
.circuit-palette {
  background: var(--circuit-bg-card);
  border: 1px solid var(--circuit-border);
  border-radius: var(--circuit-radius-lg);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.palette-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 2px;
  color: var(--circuit-text-secondary);
  text-align: center;
  margin-bottom: 4px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--circuit-border);
}

.gate-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  cursor: grab;
  user-select: none;
  padding: 8px 6px;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: all 0.2s;
  position: relative;
}

.gate-item:hover {
  background: rgba(232, 121, 121, 0.08);
  border-color: rgba(232, 121, 121, 0.2);
}

.gate-item:active {
  cursor: grabbing;
  transform: scale(0.96);
}

.gate-pill {
  width: 52px;
  height: 36px;
  border-radius: var(--circuit-radius-sm);
  display: grid;
  place-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  transition: box-shadow 0.2s, transform 0.15s;
}

.gate-item:hover .gate-pill {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* Gate pill colors — dark backgrounds with warm borders */
.gate-pill.hadamard {
  background: rgba(103, 232, 249, 0.1);
  border: 1px solid rgba(103, 232, 249, 0.4);
  color: #67e8f9;
}

.gate-pill.pauli {
  background: rgba(232, 121, 121, 0.15);
  border: 1px solid rgba(232, 121, 121, 0.4);
  color: var(--circuit-coral);
}

.gate-pill.cnot {
  background: rgba(139, 107, 174, 0.15);
  border: 1px solid rgba(139, 107, 174, 0.4);
  color: var(--circuit-purple);
}

.gate-pill.oracle {
  background: rgba(212, 165, 116, 0.15);
  border: 1px solid rgba(212, 165, 116, 0.4);
  color: var(--circuit-gold);
}

.gate-pill.diffusion {
  background: rgba(52, 224, 138, 0.1);
  border: 1px solid rgba(52, 224, 138, 0.35);
  color: #34e08a;
}

.gate-pill.measure {
  background: rgba(230, 226, 220, 0.08);
  border: 1px solid rgba(230, 226, 220, 0.2);
  color: var(--circuit-text);
}

.gate-name {
  font-size: 0.68rem;
  color: var(--circuit-text-secondary);
  text-align: center;
  line-height: 1.2;
}

.palette-divider {
  height: 1px;
  background: var(--circuit-border);
  margin: 4px 0;
}

.palette-actions {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--circuit-border);
}

/* ── Circuit Canvas ── */
.circuit-canvas-wrap {
  background: var(--circuit-bg-card);
  border: 1px solid var(--circuit-border);
  border-radius: var(--circuit-radius-lg);
  padding: 20px 24px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.circuit-canvas-wrap::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(300px 200px at 50% 50%,
    rgba(232, 121, 121, 0.06), transparent 70%);
  pointer-events: none;
}

.circuit-canvas-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 2px;
  color: var(--circuit-text-secondary);
  margin-bottom: 14px;
}

.circuit-wires {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.circuit-wire {
  display: flex;
  align-items: center;
  gap: 0;
  position: relative;
}

.wire-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--circuit-text-secondary);
  width: 32px;
  flex-shrink: 0;
  text-align: right;
  padding-right: 10px;
}

.wire-track {
  flex: 1;
  height: 44px;
  background: rgba(42, 43, 52, 0.5);
  border: 1px solid var(--circuit-border);
  border-radius: 10px;
  position: relative;
  display: flex;
  align-items: center;
  overflow-x: auto;
  overflow-y: hidden;
  gap: 4px;
  padding: 4px 6px;
  transition: border-color 0.2s, background 0.2s;
}

.wire-track.drag-over {
  border-color: var(--circuit-coral);
  background: rgba(232, 121, 121, 0.08);
}

.wire-line {
  position: absolute;
  top: 50%;
  left: 42px;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(232, 121, 121, 0.25), rgba(212, 165, 116, 0.15));
  transform: translateY(-50%);
  pointer-events: none;
  z-index: 0;
  border-radius: 1px;
}

/* ── Placed Gate in Circuit ── */
.circuit-gate {
  width: 44px;
  height: 36px;
  border-radius: var(--circuit-radius-sm);
  display: grid;
  place-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  flex-shrink: 0;
  cursor: pointer;
  position: relative;
  z-index: 1;
  transition: transform 0.15s, box-shadow 0.2s;
  animation: gate-place 0.2s ease-out;
}

@keyframes gate-place {
  from { transform: scale(0.7); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.circuit-gate:hover {
  transform: translateY(-2px) scale(1.05);
}

.circuit-gate .gate-remove {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 16px;
  height: 16px;
  background: var(--circuit-coral);
  border-radius: 50%;
  display: none;
  place-items: center;
  font-size: 10px;
  color: #fff;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
  box-shadow: 0 1px 4px rgba(0,0,0,0.5);
}

.circuit-gate:hover .gate-remove {
  display: grid;
}

/* ── Probability Output ── */
.circuit-output {
  background: var(--circuit-bg-card);
  border: 1px solid var(--circuit-border);
  border-radius: var(--circuit-radius-lg);
  padding: 20px 24px;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.circuit-output-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 2px;
  color: var(--circuit-text-secondary);
  margin-bottom: 16px;
}

.prob-bars {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.prob-row {
  display: grid;
  grid-template-columns: 48px 1fr 52px;
  align-items: center;
  gap: 10px;
}

.prob-state-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--circuit-text-secondary);
  text-align: right;
}

.prob-track {
  height: 22px;
  background: rgba(42, 43, 52, 0.6);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.prob-bar {
  height: 100%;
  border-radius: 6px;
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              background 0.3s;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 6px;
}

.prob-bar.target-state {
  background: linear-gradient(90deg, var(--circuit-coral), var(--circuit-gold));
}

.prob-bar.nontarget-high {
  background: linear-gradient(90deg, rgba(232, 121, 121, 0.6), rgba(232, 121, 121, 0.4));
}

.prob-bar.default {
  background: linear-gradient(90deg, var(--circuit-purple), rgba(139, 107, 174, 0.6));
}

.prob-pct {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--circuit-text-secondary);
  text-align: right;
}

.prob-pct.above-target {
  color: #34e08a;
  font-weight: 600;
}

.target-marker {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--circuit-text-secondary);
}

.target-marker-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--circuit-coral);
}

.target-marker-val {
  font-family: 'JetBrains Mono', monospace;
  color: var(--circuit-coral);
  font-weight: 600;
}

/* ── Controls row ── */
.circuit-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.circuit-hint-wrap {
  position: relative;
}

.circuit-hint-btn {
  padding: 10px 18px;
  background: rgba(212, 165, 116, 0.1);
  color: var(--circuit-gold);
  border: 1px solid rgba(212, 165, 116, 0.3);
  border-radius: 999px;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.circuit-hint-btn:hover {
  border-color: var(--circuit-gold);
  background: rgba(212, 165, 116, 0.15);
}

.circuit-hint-panel {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  width: 320px;
  background: var(--circuit-bg-card);
  border: 1px solid rgba(212, 165, 116, 0.4);
  border-radius: var(--circuit-radius-md);
  padding: 16px 18px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  z-index: 100;
  animation: hint-pop 0.2s ease-out;
}

@keyframes hint-pop {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hint-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.7rem;
  letter-spacing: 2px;
  color: var(--circuit-gold);
  margin-bottom: 10px;
}

.hint-text {
  font-size: 0.88rem;
  color: var(--circuit-text);
  line-height: 1.6;
}

.hint-step {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--circuit-text-secondary);
  margin-top: 8px;
}

.circuit-action-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* ── Run button — warm coral gradient ── */
.circuit-run-btn {
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--circuit-coral), var(--circuit-gold));
  color: #fff;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(232, 121, 121, 0.3);
  transition: all 0.2s;
}

.circuit-run-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 121, 121, 0.4);
}

.circuit-run-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.circuit-reset-btn {
  padding: 12px 20px;
  background: rgba(230, 226, 220, 0.05);
  color: var(--circuit-text-secondary);
  font-size: 0.88rem;
  border: 1px solid var(--circuit-border);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
}

.circuit-reset-btn:hover {
  border-color: var(--circuit-coral);
  color: var(--circuit-coral);
  background: rgba(232, 121, 121, 0.08);
}

/* ── Result feedback ── */
.circuit-result {
  padding: 14px 18px;
  border-radius: var(--circuit-radius-md);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: result-slide 0.3s ease-out;
  margin-bottom: 16px;
}

@keyframes result-slide {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.circuit-result.success {
  background: rgba(52, 224, 138, 0.1);
  border: 1px solid rgba(52, 224, 138, 0.35);
  color: #34e08a;
}

.circuit-result.error {
  background: rgba(232, 121, 121, 0.1);
  border: 1px solid rgba(232, 121, 121, 0.35);
  color: var(--circuit-coral);
}

/* ── Success state on bars ── */
.prob-bar.success-pulse {
  animation: bar-success 0.5s ease-out;
}

@keyframes bar-success {
  0%   { box-shadow: 0 0 0 0 rgba(232, 121, 121, 0.6); }
  70%  { box-shadow: 0 0 0 10px rgba(232, 121, 121, 0); }
  100% { box-shadow: 0 0 0 0 rgba(232, 121, 121, 0); }
}

/* ── Gate drag ghost ── */
.gate-item.dragging {
  opacity: 0.4;
}

.drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.85;
  transform: rotate(-3deg) scale(1.1);
}

/* ── Station 7 status in lab home ── */
.station-card[data-station="7"] .station-icon {
  font-size: 1.8rem;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .circuit-builder {
    grid-template-columns: 1fr;
  }

  .circuit-palette {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    padding: 12px;
  }

  .palette-title {
    width: 100%;
    text-align: left;
    padding-bottom: 8px;
    margin-bottom: 0;
    border-bottom: none;
  }

  .palette-divider {
    display: none;
  }

  .palette-actions {
    flex-direction: row;
    border-top: none;
    padding-top: 0;
    margin-top: 0;
    width: 100%;
    justify-content: center;
  }

  .circuit-canvas-wrap {
    padding: 14px 12px;
  }

  .wire-track {
    min-height: 48px;
    gap: 3px;
    padding: 4px;
  }

  .circuit-gate {
    width: 40px;
    height: 32px;
    font-size: 0.72rem;
  }

  .circuit-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .circuit-action-btns {
    justify-content: center;
  }

  .circuit-hint-panel {
    width: 280px;
    left: 50%;
    transform: translateX(-50%);
  }

  .circuit-hint-panel::before {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    background: var(--circuit-bg-card);
    border-right: 1px solid rgba(212, 165, 116, 0.3);
    border-bottom: 1px solid rgba(212, 165, 116, 0.3);
    transform: translateX(-50%) rotate(45deg);
  }
}