/* TransformerPath Grid Lab — Clean, Technical, Industrial Styling */
:root {
  --gl-bg: #070e17;
  --gl-panel: rgba(13, 27, 46, 0.94);
  --gl-panel-border: rgba(30, 58, 92, 0.8);
  --gl-ink: #f0f4f8;
  --gl-muted: #94a3b8;
  --gl-accent: #f5a623;
  --gl-accent-glow: rgba(245, 166, 35, 0.35);
  --gl-cyan: #38bdf8;
  --gl-green: #22c55e;
  --gl-red: #ef4444;
  --gl-amber: #fbbf24;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--gl-bg);
  color: var(--gl-ink);
  font-family: var(--font-sans, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif);
  -webkit-font-smoothing: antialiased;
}

#gl-canvas-container {
  position: absolute;
  inset: 0;
  z-index: 1;
  cursor: grab;
}

#gl-canvas-container.dragging {
  cursor: grabbing;
}

/* Header & Journey Bar */
.gl-topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 62px;
  background: linear-gradient(180deg, rgba(7, 14, 23, 0.96) 0%, rgba(7, 14, 23, 0.85) 75%, transparent 100%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 20;
  pointer-events: none;
}

.gl-brand {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
}

.gl-brand .badge {
  background: rgba(245, 166, 35, 0.15);
  color: var(--gl-accent);
  border: 1px solid var(--gl-accent);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.gl-top-links {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.gl-btn-sm {
  background: rgba(20, 37, 61, 0.85);
  border: 1px solid var(--gl-panel-border);
  color: var(--gl-ink);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.gl-btn-sm:hover, .gl-btn-sm.active {
  background: var(--gl-panel-border);
  border-color: var(--gl-accent);
  color: #fff;
}

/* Journey Stage Bar */
.gl-journey-bar {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  background: var(--gl-panel);
  border: 1px solid var(--gl-panel-border);
  border-radius: 999px;
  padding: 6px 12px;
  display: flex;
  align-items: center;
  gap: 4px;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  max-width: calc(100vw - 16px);
  min-width: 0;
  overflow-x: auto;
}

.gl-stage-pill {
  background: transparent;
  border: 1px solid transparent;
  color: var(--gl-muted);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  flex: 0 0 auto;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.gl-stage-pill .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gl-muted);
  transition: background 0.2s;
}

.gl-stage-pill:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.gl-stage-pill.active {
  background: var(--gl-accent);
  color: #0d1b2e;
  font-weight: 700;
}

.gl-stage-pill.active .dot {
  background: #0d1b2e;
}

/* HUD Overlay Panels */
.gl-panel-left {
  position: absolute;
  top: 72px;
  left: 18px;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 280px;
  pointer-events: none;
}

.gl-card {
  pointer-events: auto;
  background: var(--gl-panel);
  border: 1px solid var(--gl-panel-border);
  border-radius: 10px;
  padding: 14px 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.gl-card-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gl-accent);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Control Elements */
.gl-btn-group {
  display: flex;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--gl-panel-border);
  background: rgba(7, 14, 23, 0.6);
}

.gl-btn-group button {
  flex: 1;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--gl-panel-border);
  color: var(--gl-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 6px 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.gl-btn-group button:last-child {
  border-right: 0;
}

.gl-btn-group button.active {
  background: var(--gl-accent);
  color: #0d1b2e;
  font-weight: 700;
}

.gl-select {
  width: 100%;
  background: rgba(7, 14, 23, 0.8);
  border: 1px solid var(--gl-panel-border);
  color: var(--gl-ink);
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  outline: none;
  cursor: pointer;
}

.gl-select:focus {
  border-color: var(--gl-accent);
}

/* Engineering HUD (Right Side) */
.gl-panel-right {
  position: absolute;
  top: 72px;
  right: 18px;
  bottom: 80px;
  width: 360px;
  z-index: 20;
  overflow-y: auto;
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--gl-panel-border) transparent;
}

.gl-eng-header {
  border-bottom: 1px solid var(--gl-panel-border);
  padding-bottom: 10px;
  margin-bottom: 12px;
}

.gl-eng-stage-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--gl-cyan);
  margin-bottom: 4px;
}

.gl-eng-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}

.gl-metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.gl-metric-box {
  background: rgba(7, 14, 23, 0.7);
  border: 1px solid var(--gl-panel-border);
  border-radius: 6px;
  padding: 8px 10px;
}

.gl-metric-lbl {
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--gl-muted);
  margin-bottom: 2px;
}

.gl-metric-val {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gl-ink);
  font-family: monospace, monospace;
}

.gl-metric-val.highlight {
  color: var(--gl-accent);
}

.gl-physics-callout {
  background: rgba(56, 189, 248, 0.08);
  border-left: 3px solid var(--gl-cyan);
  padding: 10px 12px;
  border-radius: 0 6px 6px 0;
  font-size: 0.8rem;
  line-height: 1.5;
  color: #dbeafe;
  margin-bottom: 12px;
}

.gl-physics-callout b {
  color: #fff;
}

.gl-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  text-transform: uppercase;
}

.gl-status-ok {
  background: rgba(34, 197, 94, 0.15);
  color: var(--gl-green);
  border: 1px solid var(--gl-green);
}

.gl-status-warn {
  background: rgba(251, 191, 36, 0.15);
  color: var(--gl-amber);
  border: 1px solid var(--gl-amber);
}

.gl-status-trip {
  background: rgba(239, 68, 68, 0.2);
  color: var(--gl-red);
  border: 1px solid var(--gl-red);
}

.gl-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  background: linear-gradient(135deg, #f5a623 0%, #d97706 100%);
  color: #0d1b2e;
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.1s, box-shadow 0.15s;
}

.gl-action-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(245, 166, 35, 0.4);
}

.gl-parts-panel {
  background: rgba(7, 14, 23, 0.75);
  border: 1px solid var(--gl-panel-border);
  border-left: 3px solid var(--gl-accent);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 10px 0 8px;
}

.gl-parts-title {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--gl-accent);
  margin-bottom: 4px;
}

.gl-parts-note {
  font-size: 0.7rem;
  color: var(--gl-muted);
  line-height: 1.4;
  margin: 0 0 8px;
}

.gl-parts-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.gl-parts-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.gl-parts-list a {
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
}

.gl-parts-list a:hover {
  color: var(--gl-accent);
  text-decoration: underline;
}

.gl-parts-ev {
  font-size: 0.68rem;
  color: var(--gl-muted);
  line-height: 1.35;
}

.gl-sub-links {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}

.gl-sub-link {
  flex: 1;
  background: rgba(7, 14, 23, 0.6);
  border: 1px solid var(--gl-panel-border);
  color: var(--gl-muted);
  text-decoration: none;
  font-size: 0.74rem;
  padding: 6px 8px;
  border-radius: 6px;
  text-align: center;
  transition: all 0.15s;
}

.gl-sub-link:hover {
  color: #fff;
  border-color: var(--gl-accent);
}

/* Educational Disclaimer Banner */
.gl-disclaimer {
  font-size: 0.68rem;
  color: var(--gl-muted);
  line-height: 1.4;
  margin-top: 8px;
  text-align: center;
  opacity: 0.75;
}

/* Accessibility / Non-WebGL View Switcher */
#gl-accessible-view {
  display: none;
  position: absolute;
  inset: 62px 0 0 0;
  background: var(--gl-bg);
  color: var(--gl-ink);
  overflow-y: auto;
  padding: 30px 20px 80px;
  z-index: 30;
}

#gl-accessible-view.visible {
  display: block;
}

.gl-accessible-wrap {
  max-width: 960px;
  margin: 0 auto;
}

/* Responsive Rules */
@media (max-width: 1024px) {
  .gl-panel-right {
    width: 310px;
  }
}

@media (max-width: 768px) {
  .gl-topbar {
    height: auto;
    flex-wrap: wrap;
    align-items: flex-start;
    padding: 8px 10px 12px;
    row-gap: 8px;
  }
  .gl-top-links {
    flex-wrap: wrap;
    max-width: 100%;
  }
  .gl-panel-left {
    display: none;
  }
  .gl-panel-right {
    position: fixed;
    top: auto;
    bottom: 74px;
    left: 10px;
    right: 10px;
    width: auto;
    max-height: 48vh;
  }
  .gl-journey-bar {
    left: 8px;
    right: 8px;
    bottom: 8px;
    transform: none;
    width: auto;
    max-width: none;
    padding: 4px 8px;
    justify-content: flex-start;
  }
  .gl-stage-pill {
    padding: 4px 8px;
    font-size: 0.7rem;
  }
}