/* App layout structure */

#app {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.app-header {
  height: 60px;
  background: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  flex-shrink: 0;
  z-index: 100;
}

.app-header h1 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
}

.header-controls {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.view-switcher {
  display: flex;
  gap: var(--spacing-xs);
  background: var(--color-bg);
  padding: var(--spacing-xs);
  border-radius: 6px;
  border: 1px solid var(--color-border);
}

.view-switcher .btn {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-width: 100px;
}

.app-content {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

/* Canvas container */
.canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #0d0d0d;
}

#techTreeCanvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}

#techTreeCanvas:active {
  cursor: grabbing;
}

/* Filter panel (left sidebar) */
.filter-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 320px;
  height: 100%;
  background: var(--color-bg-light);
  border-right: 1px solid var(--color-border);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  z-index: 50;
  display: flex;
  flex-direction: column;
}

.filter-panel.open {
  transform: translateX(0);
}

.filter-panel-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.filter-panel-header h2 {
  font-size: var(--font-size-lg);
}

.filter-panel-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
}

.filter-section {
  margin-bottom: var(--spacing-lg);
}

.filter-section h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-dim);
  text-transform: uppercase;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

/* Search input */
.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Filter checkboxes */
.filter-checkboxes {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-height: 300px;
  overflow-y: auto;
}

.filter-checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s ease;
  user-select: none;
}

.filter-checkbox-label:hover {
  background: var(--color-bg-lighter);
}

.filter-checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.filter-checkbox-label span {
  flex: 1;
}

/* Cost range */
.cost-range-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.cost-range-container input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--color-bg-lighter);
  border-radius: 2px;
  outline: none;
}

.cost-range-container input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-primary);
  border-radius: 50%;
  cursor: pointer;
}

.cost-range-container input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--color-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.cost-range-labels {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: var(--color-text-dim);
}

/* Active filters badge */
.active-filters-badge {
  position: sticky;
  bottom: 0;
  padding: var(--spacing-sm);
  background: var(--color-primary);
  color: white;
  text-align: center;
  border-radius: 4px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* Responsive design */
@media (max-width: 1024px) {
  .filter-panel {
    width: 280px;
  }
}

@media (max-width: 768px) {
  .filter-panel {
    width: 100%;
    max-width: 320px;
  }

  .app-header h1 {
    font-size: var(--font-size-lg);
  }

  .legend {
    max-width: 160px;
    padding: var(--spacing-sm);
  }
}