/* Maze Builder - Main Styles */

:root {
  /* Color Palette (colorblind-safe) */
  --color-wall: #2d3748;
  --color-pathway: #f7fafc;
  --color-start: #38a169;
  --color-end: #e53e3e;
  --color-path-overlay: #4299e1;
  --color-unreachable: #fbd38d;
  --color-warning: #ed8936;
  --color-focus: #805ad5;

  /* UI Colors */
  --color-bg: #1a202c;
  --color-surface: #2d3748;
  --color-surface-hover: #4a5568;
  --color-text: #e2e8f0;
  --color-text-muted: #a0aec0;
  --color-border: #4a5568;
  --color-primary: #4299e1;
  --color-primary-hover: #3182ce;
  --color-danger: #e53e3e;
  --color-success: #38a169;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-size-sm: 12px;
  --font-size-md: 14px;
  --font-size-lg: 16px;

  /* Layout */
  --header-height: 48px;
  --toolbar-height: 44px;
  --status-height: 28px;
  --config-width: 220px;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  color: var(--color-text);
  background: var(--color-bg);
  overflow: hidden;
  height: 100vh;
}

/* App Layout */
.app-layout {
  display: grid;
  grid-template-rows: var(--header-height) 1fr var(--toolbar-height) var(--status-height);
  height: 100vh;
}

/* Header */
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
}

.header-right {
  display: flex;
  gap: var(--space-sm);
}

.header-btn {
  padding: var(--space-xs) var(--space-md);
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: background 0.15s;
}

.header-btn:hover {
  background: var(--color-surface-hover);
}

/* Main Content */
.main-content {
  display: grid;
  grid-template-columns: var(--config-width) 1fr;
  overflow: hidden;
}

/* Config Panel */
.config-panel {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--space-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.config-heading {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.config-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

/* Canvas Viewport */
.canvas-viewport {
  position: relative;
  overflow: hidden;
  background: #171923;
  display: flex;
  align-items: center;
  justify-content: center;
}

#maze-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

#maze-canvas:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: -2px;
}

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  padding: var(--space-xl);
  z-index: 1;
  pointer-events: none;
}

.empty-state p {
  max-width: 300px;
  line-height: 1.6;
}

.coordinates {
  position: absolute;
  bottom: var(--space-sm);
  left: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  background: rgba(26, 32, 44, 0.8);
  padding: 2px var(--space-sm);
  border-radius: 3px;
}

.minimap {
  position: absolute;
  bottom: var(--space-md);
  right: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  gap: var(--space-sm);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.tool-group {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.tool-separator {
  width: 1px;
  height: 24px;
  background: var(--color-border);
  margin: 0 var(--space-sm);
}

/* Status Bar */
.status-bar {
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  gap: var(--space-sm);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.status-sep {
  color: var(--color-border);
}

.status-warning {
  color: var(--color-warning);
  font-weight: 600;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-overlay:not([hidden]) {
  display: flex;
}

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-xl);
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  min-width: 320px;
}