/* Procedural Animation & Kinematics Styles */
:root {
  --bg-color: #080c10;
  --panel-bg: rgba(13, 19, 26, 0.82);
  --panel-border: rgba(255, 255, 255, 0.09);
  --primary-color: #3da9fc;
  --primary-glow: rgba(61, 169, 252, 0.35);
  --accent-color: #ffaa00;
  --success-color: #00e676;
  --danger-color: #ff4757;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --card-bg: rgba(255, 255, 255, 0.035);
  --card-hover: rgba(255, 255, 255, 0.08);
  --card-active: rgba(61, 169, 252, 0.15);
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --font-title: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-body);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  user-select: none;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: rgba(10, 15, 22, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--panel-border);
  z-index: 50;
  height: 64px;
  gap: 16px;
}

.back-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.back-link:hover {
  color: var(--primary-color);
  transform: translateX(-3px);
}

.header-center {
  display: flex;
  align-items: center;
  gap: 20px;
}

.app-title {
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(135deg, #ffffff 40%, var(--primary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.biome-picker {
  display: flex;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 3px;
  gap: 2px;
}

.biome-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.biome-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.08);
}

.biome-btn.active {
  color: #fff;
  background: var(--primary-color);
  box-shadow: 0 0 10px var(--primary-glow);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-btn, .header-audio-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  padding: 7px 13px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 7px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.header-btn:hover, .header-audio-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.1);
}

.header-audio-btn.active {
  background: rgba(0, 230, 118, 0.15);
  border-color: var(--success-color);
  color: var(--success-color);
  box-shadow: 0 0 12px rgba(0, 230, 118, 0.25);
}

/* App Main Layout */
.app-container {
  display: flex;
  flex: 1;
  position: relative;
  overflow: hidden;
  height: calc(100vh - 64px);
}

/* Canvas Area */
.canvas-wrapper {
  flex: 1;
  position: relative;
  height: 100%;
  overflow: hidden;
  background-color: #05080c;
}

#simCanvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

/* HUD Overlay Elements */
.canvas-hud {
  position: absolute;
  pointer-events: none;
  z-index: 20;
}

.top-hud {
  top: 16px;
  left: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hud-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(10, 15, 22, 0.75);
  backdrop-filter: blur(10px);
  border: 1px solid var(--panel-border);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.hud-label {
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.5px;
  font-weight: 700;
}

.hud-value {
  color: var(--primary-color);
  font-family: var(--font-mono);
  font-weight: 700;
}

.bottom-hud {
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
}

.instruction-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(10, 15, 22, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 30px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
  transition: opacity 0.3s;
}

.instruction-badge i {
  color: var(--primary-color);
}

/* Sidebar Control Panel */
.control-panel {
  width: 360px;
  max-width: 100%;
  height: 100%;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  gap: 16px;
  z-index: 30;
  box-sizing: border-box;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.control-panel::-webkit-scrollbar {
  width: 6px;
}
.control-panel::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.panel-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.panel-section h3 {
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-section h3 i {
  color: var(--primary-color);
}

/* Creature Grid Cards */
.creature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  width: 100%;
  box-sizing: border-box;
}

.creature-card {
  background: var(--card-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  padding: 8px 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  text-align: left;
  min-width: 0;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
  transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.creature-card:hover {
  background: var(--card-hover);
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-2px);
}

.creature-card.active {
  background: var(--card-active);
  border-color: var(--primary-color);
  box-shadow: 0 0 14px var(--primary-glow);
}

.card-icon {
  font-size: 15px;
  color: var(--primary-color);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(61, 169, 252, 0.1);
  border-radius: 7px;
  flex-shrink: 0;
}

.creature-card.active .card-icon {
  background: var(--primary-color);
  color: #fff;
}

.card-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
  overflow: hidden;
}

.creature-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
}

.creature-sub {
  font-size: 9.5px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}

/* Forms and Selects */
.form-select {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  padding: 8px 12px;
  outline: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.form-select:hover, .form-select:focus {
  border-color: var(--primary-color);
  background: rgba(255, 255, 255, 0.08);
}

.form-select option {
  background: #0d131a;
  color: var(--text-main);
}

.prompt-hint {
  font-size: 11px;
  color: #00e676;
  background: rgba(0, 230, 118, 0.08);
  border: 1px solid rgba(0, 230, 118, 0.2);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  line-height: 1.4;
}

.prompt-hint.hidden {
  display: none;
}

/* Segmented Control Buttons */
.segmented-control {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}

.segment-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  padding: 6px 4px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  transition: all 0.2s ease;
}

.segment-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
}

.segment-btn.active {
  color: #fff;
  background: var(--primary-color);
  box-shadow: 0 0 8px var(--primary-glow);
}

.button-row {
  display: flex;
  gap: 8px;
}

.btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex: 1;
  transition: all 0.2s ease;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn.primary {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #fff;
}

.btn.primary:hover {
  background: #2b98eb;
  box-shadow: 0 0 12px var(--primary-glow);
}

.btn.danger {
  background: rgba(255, 71, 87, 0.15);
  border-color: rgba(255, 71, 87, 0.3);
  color: var(--danger-color);
}

.btn.danger:hover {
  background: var(--danger-color);
  color: #fff;
}

.btn.full-width {
  width: 100%;
}

/* Checkboxes */
.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
  accent-color: var(--primary-color);
  width: 15px;
  height: 15px;
  cursor: pointer;
}

.checkbox-group label {
  cursor: pointer;
}

.checkbox-group:hover label {
  color: var(--text-main);
}

/* Sliders */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group.hidden {
  display: none;
}

.slider-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

.slider-row label {
  color: var(--text-muted);
  font-weight: 500;
}

.monospaced-val {
  font-family: var(--font-mono);
  color: var(--primary-color);
  font-weight: 600;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 5px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  box-shadow: 0 0 8px var(--primary-glow);
  transition: transform 0.15s ease;
}

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

/* Palette Swatches */
.palette-options {
  display: flex;
  gap: 8px;
}

.palette-swatch {
  flex: 1;
  height: 28px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.palette-swatch:hover {
  transform: scale(1.1);
}

.palette-swatch.active {
  border-color: #fff;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
  transform: scale(1.08);
}

/* Theory Modal */
.theory-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.theory-modal.show {
  opacity: 1;
  pointer-events: auto;
}

.theory-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 8, 12, 0.85);
  backdrop-filter: blur(12px);
}

.theory-dialog {
  position: relative;
  width: 90%;
  max-width: 680px;
  max-height: 85vh;
  background: #0f1620;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 2;
}

.theory-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--panel-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theory-header h2 {
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.theory-header h2 i {
  color: var(--accent-color);
}

.theory-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
  line-height: 1;
}

.theory-close-btn:hover {
  color: #fff;
}

.theory-content {
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  font-size: 13px;
  line-height: 1.6;
  color: #cbd5e1;
}

.theory-block h3 {
  font-family: var(--font-title);
  font-size: 14px;
  color: var(--primary-color);
  margin-bottom: 6px;
}

.theory-block p {
  margin-bottom: 8px;
}

.theory-block ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.math-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(61, 169, 252, 0.2);
  border-left: 3px solid var(--primary-color);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  color: #7dd3fc;
  overflow-x: auto;
  margin: 8px 0;
}

.theory-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--panel-border);
  display: flex;
  justify-content: flex-end;
}

/* Responsive Rules */
@media (max-width: 900px) {
  .app-header {
    padding: 10px 16px;
    height: 56px;
  }
  .app-container {
    flex-direction: column-reverse;
    height: calc(100vh - 56px);
  }
  .control-panel {
    width: 100%;
    height: 45%;
    border-left: none;
    border-top: 1px solid var(--panel-border);
  }
  .canvas-wrapper {
    height: 55%;
  }
  .biome-picker span {
    display: none;
  }
}