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

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-surface: #16213e;
  --accent: #ff3e8a;
  --accent-hover: #ff6aa5;
  --text-primary: #e8e8f0;
  --text-muted: #8888aa;
  --border: #2a2a4a;
  --pixel-bg: #1e1e38;
  --pixel-border: #2a2a50;
  --radius: 10px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 28px 20px 12px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a855f7, #3b82f6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

main {
  flex: 1;
  display: flex;
  gap: 24px;
  padding: 20px 28px 28px;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

/* --- Controls Sidebar --- */

.controls {
  width: 220px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.control-group {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.control-group > label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* Color picker */

.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
}

#colorPicker {
  width: 42px;
  height: 42px;
  border: 2px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  background: none;
  padding: 2px;
}

#colorPicker::-webkit-color-swatch-wrapper {
  padding: 0;
}

#colorPicker::-webkit-color-swatch {
  border: none;
  border-radius: 5px;
}

.color-preview {
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Grid size selector */

select {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

select:hover,
select:focus {
  border-color: var(--accent);
}

/* Tool buttons */

.tool-buttons {
  display: flex;
  gap: 8px;
}

.tool-btn {
  flex: 1;
  padding: 8px;
  font-size: 1.15rem;
  background: var(--bg-surface);
  border: 2px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
}

.tool-btn:hover {
  border-color: var(--accent-hover);
}

.tool-btn.active {
  border-color: var(--accent);
  background: rgba(255, 62, 138, 0.15);
  color: var(--accent);
}

/* Quick color palette */

.palette {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
  max-height: 200px;
  overflow-y: auto;
  padding-right: 2px;
}

.palette-color {
  aspect-ratio: 1;
  border: 2px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.palette-color:hover {
  transform: scale(1.15);
  border-color: #fff;
}

.palette-color.active {
  border-color: #fff;
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

/* Template & action buttons */

.template-buttons {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.btn {
  padding: 9px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.btn:hover {
  border-color: var(--accent);
  background: rgba(255, 62, 138, 0.08);
}

.actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: none;
  border: none;
  padding: 0;
}

.btn-clear {
  background: var(--bg-secondary);
  border-color: #ef4444;
  color: #ef4444;
}

.btn-clear:hover {
  background: rgba(239, 68, 68, 0.12);
}

.btn-export {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.btn-export:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-whatsapp {
  background: #25d366;
  border-color: #25d366;
  color: #fff;
  font-weight: 600;
}

.btn-whatsapp:hover {
  background: #1ebe5d;
  border-color: #1ebe5d;
}

/* Import image */

.btn-import {
  width: 100%;
  background: var(--bg-surface);
  border-color: #3b82f6;
  color: #3b82f6;
  font-weight: 600;
}

.btn-import:hover {
  background: rgba(59, 130, 246, 0.12);
  border-color: #60a5fa;
  color: #60a5fa;
}

.import-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 8px;
  line-height: 1.3;
}

/* --- Mode Toggle --- */

.mode-toggle {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  width: 100%;
  max-width: 240px;
}

.mode-btn {
  flex: 1;
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

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

.mode-btn.active {
  background: var(--accent);
  color: #fff;
}

.hidden {
  display: none !important;
}

/* --- Grid / Canvas Area --- */

.canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.grid-container {
  display: grid;
  gap: 1px;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2px;
  max-width: 560px;
  width: 100%;
  aspect-ratio: 1;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

.pixel {
  background: var(--pixel-bg);
  border-radius: 2px;
  cursor: crosshair;
  transition: background-color 0.05s;
}

.pixel:hover {
  outline: 2px solid rgba(255, 255, 255, 0.25);
  outline-offset: -1px;
  z-index: 1;
}

/* --- Animation Panel --- */

.animation-panel {
  width: 100%;
  max-width: 560px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.anim-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.anim-header > label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
}

.anim-playback {
  display: flex;
  gap: 4px;
}

.anim-btn {
  width: 32px;
  height: 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.anim-btn:hover {
  border-color: var(--accent);
}

.anim-btn.anim-play {
  width: 40px;
  font-size: 0.85rem;
}

.anim-btn.playing {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.frame-counter {
  margin-left: auto;
  font-size: 0.8rem;
  font-family: 'Consolas', 'Courier New', monospace;
  color: var(--text-muted);
}

/* Timeline thumbnail strip */

.timeline {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 4px 0;
}

.timeline::-webkit-scrollbar {
  height: 4px;
}

.timeline::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.frame-thumb {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  border: 2px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  image-rendering: pixelated;
  background: var(--pixel-bg);
  transition: border-color 0.15s;
}

.frame-thumb:hover {
  border-color: var(--accent-hover);
}

.frame-thumb.active {
  border-color: var(--accent);
  box-shadow: 0 0 8px rgba(255, 62, 138, 0.35);
}

/* Animation sub-controls */

.anim-controls {
  display: flex;
  gap: 6px;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.75rem;
  flex: 1;
}

.btn-danger {
  border-color: #ef4444;
  color: #ef4444;
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.12);
}

.fps-control {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.fps-control label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.fps-control input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

.anim-actions {
  display: flex;
  gap: 6px;
}

.anim-actions .btn {
  flex: 1;
}

.btn-export-gif {
  background: linear-gradient(135deg, #a855f7, #3b82f6);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
}

.btn-export-gif:hover {
  opacity: 0.9;
  border-color: transparent;
  background: linear-gradient(135deg, #a855f7, #3b82f6);
}

/* --- Responsive --- */

/* Tablet */
@media (max-width: 768px) {
  header {
    padding: 16px 12px 8px;
  }

  main {
    flex-direction: column;
    padding: 10px;
    gap: 14px;
  }

  /* Reorder: grid first, controls below */
  .canvas-area {
    order: -1;
  }

  .controls {
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .control-group {
    flex: 1 1 calc(50% - 4px);
    min-width: 0;
    padding: 10px;
  }

  /* Full-width action buttons */
  .control-group.actions {
    flex-basis: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .actions .btn {
    flex: 1 1 calc(33% - 4px);
    min-width: 0;
  }

  .grid-container {
    max-width: 100%;
  }

  .animation-panel {
    max-width: 100%;
  }

  .template-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}

/* Mobile */
@media (max-width: 480px) {
  header {
    padding: 12px 10px 6px;
  }

  header h1 {
    font-size: 1.4rem;
  }

  .subtitle {
    font-size: 0.78rem;
  }

  main {
    padding: 8px;
    gap: 10px;
  }

  /* Stack controls vertically, each full width */
  .controls {
    gap: 6px;
  }

  .control-group {
    flex-basis: 100%;
    padding: 10px;
  }

  .control-group > label {
    font-size: 0.7rem;
    margin-bottom: 8px;
  }

  /* Bigger touch targets */
  .btn {
    padding: 12px 14px;
    font-size: 0.9rem;
    min-height: 44px;
  }

  .tool-btn {
    padding: 10px;
    min-height: 44px;
    font-size: 1.2rem;
  }

  select {
    padding: 10px;
    font-size: 1rem;
    min-height: 44px;
  }

  /* Palette: more columns on small screens for less scrolling */
  .palette {
    grid-template-columns: repeat(6, 1fr);
    max-height: 150px;
    gap: 4px;
  }

  .palette-color {
    border-radius: 4px;
  }

  /* Template grid */
  .template-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
  }

  /* Action buttons: 1 per row */
  .control-group.actions {
    flex-direction: column;
  }

  .actions .btn {
    flex-basis: auto;
    width: 100%;
  }

  /* Mode toggle wider on mobile */
  .mode-toggle {
    max-width: 100%;
  }

  .mode-btn {
    padding: 12px 16px;
    font-size: 0.9rem;
    min-height: 44px;
  }

  /* Animation panel */
  .animation-panel {
    padding: 10px;
    gap: 10px;
  }

  .anim-btn {
    width: 40px;
    height: 40px;
    font-size: 0.85rem;
  }

  .anim-btn.anim-play {
    width: 48px;
  }

  .frame-thumb {
    width: 46px;
    height: 46px;
  }

  .btn-sm {
    padding: 10px 8px;
    font-size: 0.8rem;
    min-height: 40px;
  }

  .fps-control input[type="range"] {
    height: 28px;
  }

  /* Color picker bigger for fingers */
  #colorPicker {
    width: 48px;
    height: 48px;
  }

  .import-hint {
    font-size: 0.68rem;
  }
}

/* Very small screens (iPhone SE, etc.) */
@media (max-width: 360px) {
  header h1 {
    font-size: 1.2rem;
  }

  main {
    padding: 6px;
  }

  .control-group {
    padding: 8px;
  }

  .palette {
    grid-template-columns: repeat(5, 1fr);
  }

  .frame-thumb {
    width: 40px;
    height: 40px;
  }
}