/**
 * World Simulator - Modern UI Styles
 * Glass morphism design with gradient accents
 */

:root {
  /* Light Theme */
  --bg-gradient-start: #667eea;
  --bg-gradient-end: #764ba2;
  --bg-canvas: #f0f2f5;
  --bg-panel: rgba(255, 255, 255, 0.95);
  --bg-panel-glass: rgba(255, 255, 255, 0.85);
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --border-color: rgba(0, 0, 0, 0.08);
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --accent-success: #48bb78;
  --accent-danger: #f56565;
  --accent-warning: #ed8936;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);
}

body.dark-theme {
  --bg-gradient-start: #2d3748;
  --bg-gradient-end: #1a202c;
  --bg-canvas: #0f1419;
  --bg-panel: rgba(26, 32, 44, 0.95);
  --bg-panel-glass: rgba(26, 32, 44, 0.85);
  --text-primary: #f7fafc;
  --text-secondary: #cbd5e0;
  --text-muted: #a0aec0;
  --border-color: rgba(255, 255, 255, 0.1);
  --accent-primary: #7c3aed;
  --accent-secondary: #a78bfa;
  --accent-success: #34d399;
  --accent-danger: #f87171;
  --accent-warning: #fbbf24;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(124, 58, 237, 0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  color: var(--text-primary);
  overflow: hidden;
  transition: all 0.3s ease;
}

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

/* ===== TOOLBAR ===== */
#toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  background: var(--bg-panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  z-index: 100;
}

.toolbar-section {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toolbar-section:first-child::before {
  content: '⚛️';
  font-size: 24px;
  margin-right: 8px;
}

#toolbar h1 {
  font-size: 22px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

/* ===== BUTTONS ===== */
button {
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

button:hover::before {
  left: 100%;
}

button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.tool-btn {
  background: var(--bg-panel-glass);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.tool-btn:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.tool-btn.active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

/* ===== CANVAS CONTAINER ===== */
#canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg-canvas);
  margin: 8px;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
}

#canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  border-radius: 16px;
}

/* ===== HUD ===== */
#hud {
  position: absolute;
  top: 24px;
  left: 24px;
  pointer-events: none;
  z-index: 10;
}

#paused-status {
  font-size: 36px;
  font-weight: 800;
  color: white;
  background: linear-gradient(135deg, var(--accent-danger), var(--accent-warning));
  padding: 16px 32px;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  letter-spacing: 1px;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(1.02); }
}

/* ===== CONTROL PANEL ===== */
#control-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  height: 100vh;
  background: var(--bg-panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 80px 24px 24px 24px;
  box-shadow: var(--shadow-lg);
  z-index: 99;
  transition: transform 0.3s ease;
}

.panel-section {
  margin-bottom: 32px;
  padding: 20px;
  background: var(--bg-panel-glass);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.panel-section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.panel-section h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-section h3::before {
  content: '';
  width: 4px;
  height: 20px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 2px;
}

.control-group {
  margin-bottom: 20px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.control-group label span {
  color: var(--accent-primary);
  font-family: 'Courier New', monospace;
}

/* ===== RANGE INPUTS ===== */
input[type="range"] {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

input[type="range"]:hover {
  background: var(--accent-primary);
  opacity: 0.3;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: var(--shadow-glow);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.2);
  box-shadow: var(--shadow-glow);
}

/* ===== CHECKBOX ===== */
input[type="checkbox"] {
  position: relative;
  width: 20px;
  height: 20px;
  margin-right: 10px;
  cursor: pointer;
  appearance: none;
  background: var(--bg-panel-glass);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  transition: all 0.3s ease;
}

input[type="checkbox"]:checked {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-color: transparent;
}

input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  color: white;
  font-size: 14px;
  font-weight: bold;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

input[type="checkbox"]:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

/* ===== TEXT INPUTS ===== */
input[type="number"],
input[type="color"] {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-panel-glass);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}

input[type="number"]:focus,
input[type="color"]:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input[type="color"] {
  height: 44px;
  cursor: pointer;
  padding: 4px;
}

/* ===== METRICS ===== */
.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  font-size: 13px;
}

.metrics > div {
  background: var(--bg-panel-glass);
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.metrics > div:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.metrics strong {
  display: block;
  color: var(--accent-primary);
  font-weight: 700;
  margin-bottom: 4px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metrics span {
  color: var(--text-primary);
  font-size: 18px;
  font-weight: 600;
}

/* ===== PROPERTY PANEL ===== */
.property {
  margin-bottom: 12px;
  padding: 12px;
  background: var(--bg-panel-glass);
  border-radius: 10px;
  border: 1px solid var(--border-color);
  font-size: 14px;
}

.property strong {
  color: var(--accent-primary);
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  text-transform: uppercase;
}

.property span {
  color: var(--text-primary);
  font-weight: 500;
}

/* ===== BUTTON GROUPS ===== */
.button-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 10px;
}

.button-group-vertical {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.button-group-vertical button {
  width: 100%;
  text-align: left;
  padding-left: 16px;
}

/* ===== HELP TEXT ===== */
.help-text {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
}

.help-text p {
  margin-bottom: 10px;
}

.help-text strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}

.help-text ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 12px;
}

.help-text li {
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
}

.help-text li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: bold;
}

/* ===== SCROLLBAR ===== */
#control-panel::-webkit-scrollbar {
  width: 10px;
}

#control-panel::-webkit-scrollbar-track {
  background: transparent;
}

#control-panel::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
  transition: background 0.3s;
}

#control-panel::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* ===== FOOTER ===== */
#footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: calc(100% - 380px);
  padding: 12px 24px;
  background: var(--bg-panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
  z-index: 50;
  box-shadow: 0 -2px 8px var(--shadow-sm);
}

#footer a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  position: relative;
}

#footer a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  transition: width 0.3s ease;
}

#footer a:hover {
  color: var(--accent-secondary);
}

#footer a:hover::after {
  width: 100%;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  #control-panel {
    width: 100%;
    height: auto;
    max-height: 60vh;
    top: auto;
    bottom: 0;
    border-left: none;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
  }
  
  #toolbar {
    flex-wrap: wrap;
    padding: 10px 16px;
  }
  
  #toolbar h1 {
    font-size: 18px;
  }
  
  button {
    padding: 8px 14px;
    font-size: 13px;
  }
  
  #canvas-container {
    margin: 4px;
    border-radius: 12px;
  }
  
  #footer {
    width: 100%;
    font-size: 12px;
    padding: 10px 16px;
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-section {
  animation: fadeIn 0.4s ease-out;
}

.panel-section:nth-child(1) { animation-delay: 0.05s; }
.panel-section:nth-child(2) { animation-delay: 0.1s; }
.panel-section:nth-child(3) { animation-delay: 0.15s; }
.panel-section:nth-child(4) { animation-delay: 0.2s; }
.panel-section:nth-child(5) { animation-delay: 0.25s; }