:root {
  --color-bg: #0a0c10;
  --color-bg-elevated: #12151c;
  --color-bg-panel: rgba(18, 21, 28, 0.85);
  --color-bg-card: rgba(25, 30, 40, 0.9);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);

  --color-text: #f0f4f8;
  --color-text-muted: #8a9bb0;
  --color-text-subtle: #5a6a80;

  --color-accent: #f97316;
  --color-accent-hover: #fb923c;
  --color-accent-glow: rgba(249, 115, 22, 0.2);

  --color-fire: #ff6b35;
  --color-heat: #ff4500;
  --color-cool: #3b82f6;
  --color-success: #22c55e;
  --color-warning: #eab308;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --space-xs: 0.375rem;
  --space-sm: 0.625rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;

  --shadow-panel: 0 4px 30px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3);

  --transition-fast: 120ms ease;
  --transition-normal: 200ms ease;
}

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

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-panel);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.app-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.app-subtitle {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.weather-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-size: 0.85rem;
}

.weather-icon {
  font-size: 1.1rem;
}

.weather-text {
  color: var(--color-text-muted);
}

.app-main {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-lg);
  padding: var(--space-lg);
  min-height: calc(100vh - 80px);
}

@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  height: fit-content;
  position: sticky;
  top: calc(80px + var(--space-lg));
}

@media (max-width: 1024px) {
  .control-panel {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

.panel-section {
  background: var(--color-bg-panel);
  backdrop-filter: blur(16px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-panel);
}

.section-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.control-group {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-group label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  grid-column: 1 / -1;
}

.control-group input[type="range"] {
  grid-column: 1;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 0 8px var(--color-accent-glow);
}

.control-group input[type="range"]:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.control-group output {
  grid-column: 2;
  min-width: 55px;
  text-align: right;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.control-group select {
  grid-column: 1 / -1;
  width: 100%;
  padding: var(--space-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.control-group select:hover {
  border-color: var(--color-border-hover);
}

.control-group select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.control-group input[type="number"] {
  grid-column: 1 / -1;
  width: 100%;
  padding: var(--space-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.control-group input[type="number"]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.control-group input[type="checkbox"] {
  grid-column: 2;
  justify-self: end;
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.button-row {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--color-accent-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-border-hover);
}

.btn-small {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  margin-top: var(--space-sm);
  width: 100%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn-small:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
}

.simulation-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.canvas-wrapper {
  position: relative;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-panel);
  min-height: 500px;
  height: 65vh;
  max-height: 700px;
}

.canvas-wrapper canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.canvas-overlay {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  opacity: 0.6;
  transition: opacity var(--transition-normal);
}

.canvas-wrapper:hover .canvas-overlay {
  opacity: 0;
}

.drag-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: var(--color-bg-panel);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(8px);
}

.metrics-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-sm);
}

.metric-card {
  background: var(--color-bg-panel);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  box-shadow: var(--shadow-card);
}

.metric-card--wide {
  grid-column: span 2;
}

@media (max-width: 600px) {
  .metric-card--wide {
    grid-column: span 1;
  }
}

.metric-label {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-subtle);
}

.metric-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.metric-value--small {
  font-size: 0.85rem;
  font-weight: 600;
}

.app-footer {
  padding: var(--space-md) var(--space-lg);
  text-align: center;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-panel);
}

.app-footer p {
  font-size: 0.75rem;
  color: var(--color-text-subtle);
  max-width: 600px;
  margin: 0 auto;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 600px) {
  html {
    font-size: 14px;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .weather-status {
    width: 100%;
    justify-content: center;
  }

  .app-main {
    padding: var(--space-md);
    gap: var(--space-md);
  }

  .control-panel {
    grid-template-columns: 1fr;
  }

  .metrics-panel {
    grid-template-columns: repeat(2, 1fr);
  }
}