/* Global styles and variables */

:root {
  /* Category colors */
  --color-energy: #FFB84D;
  --color-materials: #8B7355;
  --color-space-science: #4DA6FF;
  --color-info-science: #00D9FF;
  --color-life-science: #66FF66;
  --color-social-science: #FF6B9D;
  --color-military-science: #FF4444;

  /* UI colors */
  --color-bg: #1a1a1a;
  --color-bg-light: #2a2a2a;
  --color-bg-lighter: #3a3a3a;
  --color-text: #e0e0e0;
  --color-text-dim: #999999;
  --color-border: #444444;
  --color-primary: #4DA6FF;
  --color-success: #66FF66;
  --color-warning: #FFB84D;

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

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  overflow: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
}

/* Buttons */
.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: 4px;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--color-bg-lighter);
  color: var(--color-text);
}

.btn:hover {
  background: var(--color-bg-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: #3a8fdb;
}

.btn-primary.active {
  background: #2a7fc7;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
  background: var(--color-bg-lighter);
  border: 1px solid var(--color-border);
}

.btn-block {
  width: 100%;
}

/* Loading indicator */
.loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 1000;
}

.spinner {
  width: 50px;
  height: 50px;
  margin: 0 auto var(--spacing-md);
  border: 4px solid var(--color-bg-lighter);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Zoom controls */
.zoom-controls {
  position: absolute;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 10;
}

.zoom-btn {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 4px;
  background: var(--color-bg-lighter);
  color: var(--color-text);
  font-size: 20px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-md);
}

.zoom-btn:hover {
  background: var(--color-bg-light);
  transform: scale(1.05);
}

/* Legend */
.legend {
  position: absolute;
  top: var(--spacing-lg);
  left: var(--spacing-lg);
  background: rgba(26, 26, 26, 0.9);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--spacing-md);
  max-width: 200px;
  z-index: 10;
  backdrop-filter: blur(10px);
}

.legend h3 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
  color: var(--color-text);
}

.legend-items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.legend-item:hover {
  background: var(--color-bg-lighter);
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* Close button */
.close-btn {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  color: var(--color-text-dim);
  font-size: 24px;
  cursor: pointer;
  transition: color 0.2s ease;
  z-index: 10;
}

.close-btn:hover {
  color: var(--color-text);
}

/* Scrollbar styles */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-light);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-lighter);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border);
}