/* VLSI Physical Design Simulator - Main Styles */

/* ========================================
   CSS Variables (Theme)
   ======================================== */
:root {
  /* Colors */
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-panel: #0f3460;
  --bg-canvas: #0a0a1a;

  --text-primary: #eaeaea;
  --text-secondary: #a0a0a0;
  --text-muted: #666;

  --accent-blue: #4a90d9;
  --accent-red: #e74c3c;
  --accent-green: #2ecc71;
  --accent-yellow: #f39c12;
  --accent-purple: #9b59b6;

  /* Partitioning colors */
  --partition-a: #4a90d9;
  --partition-b: #e74c3c;
  --cut-edge: #f39c12;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* ========================================
   App Layout
   ======================================== */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.header {
  background: var(--bg-secondary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--bg-panel);
  text-align: center;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.header .subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.footer {
  background: var(--bg-secondary);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-top: 1px solid var(--bg-panel);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--bg-panel);
  overflow-y: auto;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* ========================================
   Panels
   ======================================== */
.panel {
  background: var(--bg-panel);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.panel h2 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

/* ========================================
   Form Elements
   ======================================== */
.select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--bg-panel);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.select:hover {
  border-color: var(--accent-blue);
}

.select:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--bg-panel);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-top: var(--spacing-sm);
  width: 100%;
}

.btn:hover {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
}

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

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  margin: 0;
}

.btn-primary {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
}

.btn-primary:hover {
  background: #5ba0e9;
}

/* ========================================
   Controls
   ======================================== */
.controls {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
}

.speed-control {
  margin-top: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.speed-control label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.speed-control input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-secondary);
  border-radius: 2px;
  cursor: pointer;
}

.speed-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent-blue);
  border-radius: 50%;
  cursor: pointer;
}

#speed-value {
  min-width: 30px;
  text-align: right;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ========================================
   Metrics
   ======================================== */
.metrics {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.metric {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
}

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

.metric-value {
  font-family: 'Consolas', 'Monaco', monospace;
  color: var(--accent-green);
}

/* ========================================
   Canvas Container
   ======================================== */
.canvas-container {
  flex: 1;
  position: relative;
  background: var(--bg-canvas);
  overflow: hidden;
}

#main-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}

.canvas-overlay.hidden {
  display: none;
}

/* ========================================
   Details Panel
   ======================================== */
.right-panels {
  display: flex;
  flex-direction: row;
}

.details-panel {
  width: 280px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--bg-panel);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.details-panel:first-child {
  width: 320px;
}

/* Stacked Sections */
.details-section {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--bg-panel);
}

.details-section:last-child {
  border-bottom: none;
}

.details-section-grow {
  flex: 1;
  min-height: 150px;
}

.section-header {
  padding: var(--spacing-sm) var(--spacing-md);
  margin: 0;
  background: var(--bg-panel);
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-content {
  padding: var(--spacing-sm) var(--spacing-md);
  overflow-y: auto;
  flex: 1;
}

/* Narration */
.narration {
  font-size: 0.8rem;
  line-height: 1.5;
}

.narration p {
  margin-bottom: var(--spacing-sm);
}

.narration p:last-child {
  margin-bottom: 0;
}

#narration-current {
  color: var(--accent-green);
  padding: var(--spacing-sm);
  background: rgba(46, 204, 113, 0.1);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-green);
}

/* Pseudocode */
.pseudocode {
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.75rem;
  line-height: 1.6;
  white-space: pre-wrap;
  background: var(--bg-canvas);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  margin: 0;
}

.pseudocode .line {
  padding: 2px 4px;
  border-radius: 2px;
}

.pseudocode .line.active {
  background: rgba(74, 144, 217, 0.3);
  color: var(--accent-blue);
}

/* Data View */
.data-view {
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.8rem;
}

.data-section {
  margin-bottom: var(--spacing-md);
}

.data-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: var(--spacing-xs) var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid var(--bg-panel);
}

.data-table th {
  color: var(--text-secondary);
  font-weight: 600;
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
  display: none !important;
}

.text-blue { color: var(--accent-blue); }
.text-red { color: var(--accent-red); }
.text-green { color: var(--accent-green); }
.text-yellow { color: var(--accent-yellow); }

/* ========================================
   Random Parameters Panel
   ======================================== */
.random-params {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--bg-secondary);
}

.param-group {
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.param-group label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-width: 70px;
}

.param-input {
  flex: 1;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--bg-panel);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8rem;
  max-width: 80px;
}

.param-input:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.param-range {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-secondary);
  border-radius: 2px;
  cursor: pointer;
}

.param-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  background: var(--accent-blue);
  border-radius: 50%;
  cursor: pointer;
}

.param-group span {
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-width: 30px;
  text-align: right;
}

#generate-random {
  margin-top: var(--spacing-md);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
  .sidebar {
    width: 220px;
  }

  .details-panel {
    width: 280px;
  }
}

@media (max-width: 768px) {
  .main-layout {
    flex-direction: column;
  }

  .sidebar,
  .details-panel {
    width: 100%;
    max-height: 200px;
  }

  .canvas-container {
    flex: 1;
    min-height: 300px;
  }
}