/* ============================================
   HALLUCINA.ART v2.0 - STYLES
   ============================================ */

/* ==========================================
   RESET & BASE
   ========================================== */

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

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: rgba(15, 15, 25, 0.95);
  --bg-tertiary: rgba(25, 25, 40, 0.9);
  
  --accent-primary: #00ff9f;
  --accent-secondary: #d600ff;
  --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  
  --border-color: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(0, 255, 159, 0.3);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 255, 159, 0.3);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
}

/* ==========================================
   CANVAS
   ========================================== */

#visualCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

#visualCanvas canvas {
  display: block;
}

/* ==========================================
   INTRO SCREEN
   ========================================== */

.intro-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.intro-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intro-content {
  text-align: center;
  padding: 2rem;
  max-width: 500px;
}

.intro-title {
  font-size: 3.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from { filter: drop-shadow(0 0 10px rgba(0, 255, 159, 0.3)); }
  to { filter: drop-shadow(0 0 20px rgba(214, 0, 255, 0.4)); }
}

.intro-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.intro-warning {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: rgba(255, 100, 100, 0.1);
  border: 1px solid rgba(255, 100, 100, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 2rem;
  text-align: left;
}

.warning-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.intro-warning p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.enter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.enter-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.intro-features {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2.5rem;
}

.feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.feature-icon {
  font-size: 1.5rem;
}

/* ==========================================
   UI PANEL
   ========================================== */

.ui-panel {
  position: fixed;
  top: 1rem;
  left: 1rem;
  width: 320px;
  max-height: calc(100vh - 2rem);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.ui-panel.hidden {
  transform: translateX(-340px);
  opacity: 0;
  pointer-events: none;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.icon-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* ==========================================
   PANEL SECTIONS
   ========================================== */

.panel-section {
  border-bottom: 1px solid var(--border-color);
}

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

.section-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.section-header:hover {
  background: var(--bg-tertiary);
}

.section-header .chevron {
  transition: transform var(--transition-normal);
}

.section-header[aria-expanded="false"] .chevron {
  transform: rotate(-90deg);
}

.section-content {
  padding: 0 1.25rem 1rem;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.section-content.collapsed {
  max-height: 0 !important;
  padding-top: 0;
  padding-bottom: 0;
}

/* ==========================================
   PRESET GRID
   ========================================== */

.preset-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.preset-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.75rem 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.preset-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--preset-gradient, var(--accent-gradient));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.preset-btn:hover::before {
  opacity: 0.15;
}

.preset-btn.active {
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px rgba(0, 255, 159, 0.2);
}

.preset-btn.active::before {
  opacity: 0.2;
}

.preset-icon {
  font-size: 1.5rem;
  position: relative;
  z-index: 1;
}

.preset-name {
  font-size: 0.75rem;
  font-weight: 500;
  position: relative;
  z-index: 1;
}

/* ==========================================
   CHIPS
   ========================================== */

.chip-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip:hover {
  background: rgba(0, 255, 159, 0.1);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.chip.active {
  background: var(--accent-gradient);
  border-color: transparent;
  color: var(--bg-primary);
  font-weight: 500;
}

.color-chip {
  position: relative;
  padding-left: 1.75rem;
}

.color-chip::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--chip-color, #fff);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ==========================================
   SLIDERS
   ========================================== */

.slider-group {
  margin-bottom: 1rem;
}

.slider-group:last-child {
  margin-bottom: 0;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.slider {
  width: 100%;
  height: 6px;
  appearance: none;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent-gradient);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent-gradient);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

/* ==========================================
   AUDIO
   ========================================== */

.audio-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.audio-toggle:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.audio-toggle.active {
  background: rgba(0, 255, 159, 0.15);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.audio-meters {
  margin-top: 1rem;
  display: none;
}

.audio-meters.visible {
  display: block;
}

.meter-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.meter-row:last-child {
  margin-bottom: 0;
}

.meter-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  width: 40px;
}

.meter-track {
  flex: 1;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  width: 0%;
  border-radius: 3px;
  transition: width 0.1s ease;
}

.meter-fill.bass {
  background: linear-gradient(90deg, #ff0066, #ff3399);
}

.meter-fill.mid {
  background: linear-gradient(90deg, #00ff9f, #00ffcc);
}

.meter-fill.treble {
  background: linear-gradient(90deg, #00ccff, #0099ff);
}

/* ==========================================
   FLOATING CONTROLS
   ========================================== */

.floating-controls {
  position: fixed;
  top: 1rem;
  right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 100;
}

.float-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.float-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: scale(1.05);
}

.float-btn.paused {
  background: rgba(0, 255, 159, 0.15);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* ==========================================
   FOOTER
   ========================================== */

.site-footer {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  z-index: 100;
}

.footer-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.85rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.support-btn {
  background: var(--accent-gradient);
  color: var(--bg-primary);
  font-weight: 500;
}

.support-btn:hover {
  transform: scale(1.05);
  color: var(--bg-primary);
}

/* ==========================================
   MODAL
   ========================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal.visible {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 450px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

.modal h2 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal h3 {
  font-size: 1rem;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-primary);
}

.shortcut-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.shortcut {
  display: flex;
  align-items: center;
  gap: 1rem;
}

kbd {
  min-width: 60px;
  padding: 0.3rem 0.6rem;
  font-family: monospace;
  font-size: 0.85rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-align: center;
}

.shortcut span {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.tips-list {
  list-style: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.tips-list li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
}

.tips-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* ==========================================
   TOAST
   ========================================== */

.toast {
  position: fixed;
  bottom: 5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 0.75rem 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.9rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1001;
}

.toast.visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================
   FULLSCREEN MODE
   ========================================== */

body.fullscreen .ui-panel,
body.fullscreen .floating-controls,
body.fullscreen .site-footer {
  opacity: 0;
  pointer-events: none;
}

body.fullscreen:hover .floating-controls {
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 768px) {
  .ui-panel {
    width: 100%;
    max-width: none;
    left: 0;
    right: 0;
    top: auto;
    bottom: 0;
    max-height: 60vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
  
  .ui-panel.hidden {
    transform: translateY(100%);
  }
  
  .intro-title {
    font-size: 2.5rem;
  }
  
  .intro-features {
    gap: 1rem;
  }
  
  .site-footer {
    bottom: 0;
    left: 0;
    right: 0;
    transform: none;
    border-radius: 0;
    justify-content: center;
  }
  
  .floating-controls {
    flex-direction: row;
    top: auto;
    bottom: 4.5rem;
    right: 1rem;
  }
  
  .preset-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .preset-btn {
    padding: 0.5rem;
  }
  
  .preset-name {
    display: none;
  }
}

@media (max-width: 480px) {
  .preset-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .footer-btn span:last-child {
    display: none;
  }
  
  .support-btn span:last-child {
    display: inline;
  }
}

/* ==========================================
   SCROLLBAR
   ========================================== */

.ui-panel::-webkit-scrollbar,
.section-content::-webkit-scrollbar,
.modal-content::-webkit-scrollbar {
  width: 6px;
}

.ui-panel::-webkit-scrollbar-track,
.section-content::-webkit-scrollbar-track,
.modal-content::-webkit-scrollbar-track {
  background: transparent;
}

.ui-panel::-webkit-scrollbar-thumb,
.section-content::-webkit-scrollbar-thumb,
.modal-content::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.ui-panel::-webkit-scrollbar-thumb:hover,
.section-content::-webkit-scrollbar-thumb:hover,
.modal-content::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}