/* ==========================================================================
   CSS CUSTOM PROPERTIES: LIGHT MODE (DEFAULT STRICT STATE)
   ========================================================================== */
:root {
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --accent-primary: #2563eb;
  --accent-focus: #1d4ed8;

  --status-active-bg: rgba(5, 150, 105, 0.12);
  --status-active-fg: #059669;
  --status-alert-bg: rgba(220, 38, 38, 0.12);
  --status-alert-fg: #dc2626;
  --status-warn-bg: rgba(217, 119, 6, 0.12);
  --status-warn-fg: #d97706;
  --status-inactive-bg: #e2e8f0;
  --status-inactive-fg: #64748b;

  --canvas-bg: #0f172a;
  --canvas-grid: rgba(255, 255, 255, 0.08);
  --canvas-bar: rgba(59, 130, 246, 0.85);

  --font-mono: ui-monospace, "SF Mono", Monaco, "Cascadia Code", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
  --bg-app: #090d16;
  --bg-surface: #111827;
  --bg-surface-elevated: #1f2937;
  --border-subtle: #1f2937;
  --border-strong: #374151;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #3b82f6;
  --accent-focus: #60a5fa;

  --status-active-bg: rgba(16, 185, 129, 0.15);
  --status-active-fg: #10b981;
  --status-alert-bg: rgba(239, 68, 68, 0.15);
  --status-alert-fg: #ef4444;
  --status-warn-bg: rgba(245, 158, 11, 0.15);
  --status-warn-fg: #f59e0b;
  --status-inactive-bg: #1f2937;
  --status-inactive-fg: #94a3b8;

  --canvas-bg: #030712;
  --canvas-grid: rgba(255, 255, 255, 0.05);
  --canvas-bar: rgba(96, 165, 250, 0.85);

  --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
}

.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.875rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand-cluster {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  color: var(--accent-primary);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
}

.semver-tag {
  color: var(--accent-primary);
  font-weight: 600;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  background: var(--bg-surface-elevated);
  padding: 0.15rem 0.45rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border-subtle);
}

.controls-cluster {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--border-strong);
  transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 9999px;
}

.slider::before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: #ffffff;
  transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 50%;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

input:checked + .slider {
  background-color: var(--accent-primary);
}

input:checked + .slider::before {
  transform: translateX(20px);
}

input:focus-visible + .slider {
  outline: 2px solid var(--accent-focus);
  outline-offset: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color 0.15s ease, transform 0.05s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent-primary);
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-focus);
}

.btn-primary:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.app-layout {
  flex: 1;
  padding: 1.5rem;
  max-width: 1920px;
  width: 100%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 1024px) {
  .app-layout {
    grid-template-columns: 360px 1fr;
    align-items: start;
  }
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 0.75rem;
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}

.telemetry-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.kpi-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.875rem;
}

.kpi-row:last-child {
  border-bottom: none;
}

.kpi-label {
  color: var(--text-secondary);
}

.kpi-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

.kpi-highlight {
  font-size: 0.9375rem;
  font-weight: 700;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-active { background: var(--status-active-bg); color: var(--status-active-fg); }
.badge-alert { background: var(--status-alert-bg); color: var(--status-alert-fg); }
.badge-warn { background: var(--status-warn-bg); color: var(--status-warn-fg); }
.badge-inactive { background: var(--status-inactive-bg); color: var(--status-inactive-fg); }
.badge-fps { font-family: var(--font-mono); background: var(--bg-surface-elevated); color: var(--text-secondary); }

.visualizer-container {
  display: flex;
  flex-direction: column;
}

.visualizer-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.visualizer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.canvas-viewport {
  position: relative;
  width: 100%;
  height: 520px;
  background: var(--canvas-bg);
  border-radius: 0.5rem;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}