* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  touch-action: none;
  background: #1a1a1a;
  font-family: system-ui, sans-serif;
}

/* --- App layout: sidebar left, canvas center, controls bottom --- */
#app {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: 1fr 108px;
  grid-template-areas:
    "sidebar canvas"
    "sidebar bottom";
}

/* --- Left sidebar --- */
#sidebar {
  grid-area: sidebar;
  background: #222;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px;
  gap: 12px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

#tools {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

#actions {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-top: auto;
}

.tool-btn, .action-btn {
  width: 78px;
  height: 78px;
  border: 3px solid transparent;
  border-radius: 21px;
  background: #333;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s;
  -webkit-user-select: none;
  user-select: none;
}

.tool-btn:active, .action-btn:active {
  transform: scale(0.9);
}

.tool-btn.active {
  border-color: #fff;
  background: #555;
}

.tool-icon {
  font-size: 36px;
  line-height: 1;
}

.action-btn {
  font-size: 33px;
  background: #3a3a3a;
}

/* --- Canvas area --- */
#canvas-area {
  grid-area: canvas;
  position: relative;
  overflow: hidden;
}

#canvas {
  width: 100%;
  height: 100%;
  display: block;
  background: #fff;
  cursor: crosshair;
  touch-action: none;
}

/* --- Canvas size preview overlay --- */
#canvas-preview {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: center;
}

#canvas-preview.hidden {
  display: none;
}

#canvas-preview .preview-circle {
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(0,0,0,0.2), 0 2px 12px rgba(0,0,0,0.15);
}

#canvas-preview .preview-emoji {
  line-height: 1;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.2));
}

/* --- Bottom bar --- */
#bottom-bar {
  grid-area: bottom;
  background: #222;
  display: flex;
  height: 100%;
  align-items: center;
  gap: 18px;
  padding: 15px 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.toolbar-section {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

#bottom-bar .toolbar-section.hidden {
  display: none;
}

#size-control {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

#brush-size {
  width: 270px;
  height: 66px;
  accent-color: #fff;
  cursor: pointer;
}

#colors {
  display: flex;
  gap: 9px;
  flex-shrink: 0;
  padding: 0 6px;
}

.color-btn {
  width: 60px;
  height: 60px;
  border: 4px solid transparent;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s;
  -webkit-user-select: none;
  user-select: none;
  flex-shrink: 0;
  position: relative;
  padding: 0;
}

.color-btn::before,
.color-btn::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.color-btn::before {
  inset: 2px;
  background: var(--swatch-fill);
}

.color-btn::after {
  inset: 2px;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.12);
}

.color-btn.is-white::after {
  box-shadow: inset 0 0 0 1px #888;
}

.color-btn.is-rainbow::before {
  inset: 3px;
}

.color-btn.is-rainbow::after {
  inset: 3px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.28);
}

.color-btn:active {
  transform: scale(0.85);
}

.color-btn.active {
  border-color: #fff;
}

.color-btn.is-custom::after {
  inset: 2px;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.22),
    0 0 0 2px rgba(255, 255, 255, 0.12);
}

.color-btn:disabled {
  cursor: default;
}

#tool-hint {
  min-height: 60px;
}

.toolbar-hint,
.toolbar-chip {
  min-height: 60px;
  padding: 0 20px;
  border-radius: 999px;
  background: #333;
  color: #f4f4f4;
  display: flex;
  align-items: center;
  white-space: nowrap;
  font-size: 20px;
}

.toolbar-chip {
  font-weight: 700;
}

.toolbar-inline-btn,
.toolbar-more-btn {
  min-height: 60px;
  padding: 0 20px;
  border: 3px solid transparent;
  border-radius: 999px;
  background: #333;
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s, background 0.15s;
  -webkit-user-select: none;
  user-select: none;
}

.toolbar-inline-btn:active,
.toolbar-more-btn:active {
  transform: scale(0.96);
}

.toolbar-inline-btn:hover,
.toolbar-more-btn:hover {
  background: #444;
}

#clear-options {
  gap: 9px;
}

.toolbar-choice-btn {
  min-height: 60px;
  padding: 0 18px;
  border: 3px solid transparent;
  border-radius: 18px;
  background: #333;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  transition: transform 0.1s, border-color 0.15s, background 0.15s;
  -webkit-user-select: none;
  user-select: none;
}

.toolbar-choice-btn.active {
  border-color: #fff;
  background: #555;
}

.toolbar-choice-btn:active {
  transform: scale(0.96);
}

.toolbar-choice-icon {
  font-size: 30px;
  line-height: 1;
}

.toolbar-choice-label {
  white-space: nowrap;
}

#sticker-quickbar {
  gap: 9px;
}

.sticker-quick-btn {
  width: 60px;
  height: 60px;
  border: 3px solid transparent;
  border-radius: 18px;
  background: #333;
  color: #fff;
  font-size: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.1s, border-color 0.15s, background 0.15s;
  -webkit-user-select: none;
  user-select: none;
  overflow: hidden;
}

.sticker-quick-btn:active {
  transform: scale(0.92);
}

.sticker-quick-btn.active {
  border-color: #fff;
  background: #555;
}

.sticker-quick-btn img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* --- Camera overlay --- */
#camera-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 15;
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

#camera-overlay.hidden {
  display: none;
}

#camera-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#camera-hint {
  position: absolute;
  bottom: 30px;
  background: rgba(0,0,0,0.6);
  color: #fff;
  padding: 12px 30px;
  border-radius: 30px;
  font-size: 24px;
  pointer-events: none;
  animation: camera-hint-pulse 2s ease-in-out infinite;
}

@keyframes camera-hint-pulse {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

/* --- Sticker panel --- */
#sticker-panel {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  max-height: 480px;
  background: #222;
  border-radius: 16px 16px 0 0;
  padding: 0;
  overflow: hidden;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.4);
  z-index: 10;
  transition: opacity 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}

#sticker-panel.hidden {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

#sticker-grid {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 1;
}

.sticker-tabs {
  display: flex;
  gap: 3px;
  padding: 12px 12px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  flex-shrink: 0;
}

.sticker-tab {
  width: 63px;
  height: 63px;
  border: none;
  border-radius: 15px 15px 6px 6px;
  background: #333;
  font-size: 30px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s;
  -webkit-user-select: none;
  user-select: none;
}

.sticker-tab:active {
  transform: scale(0.9);
}

.sticker-tab.active {
  background: #555;
  box-shadow: inset 0 -3px 0 #fff;
}

.sticker-section-label {
  color: #aaa;
  font-size: 18px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 18px 6px;
  flex-shrink: 0;
}

.sticker-emoji-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(78px, 1fr));
  gap: 6px;
  padding: 6px 12px 15px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  flex: 1;
}

.sticker-btn {
  width: 100%;
  aspect-ratio: 1;
  border: none;
  border-radius: 15px;
  background: #333;
  font-size: 42px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, background 0.15s;
  -webkit-user-select: none;
  user-select: none;
}

.sticker-btn:active {
  transform: scale(0.85);
}

.sticker-btn.active {
  background: #555;
  box-shadow: inset 0 0 0 2px #fff;
}

/* --- Sticker search --- */
#sticker-search {
  width: 100%;
  padding: 12px 18px;
  border: none;
  border-bottom: 1px solid #444;
  background: #2a2a2a;
  color: #fff;
  font-size: 21px;
  outline: none;
  flex-shrink: 0;
}

#sticker-search::placeholder {
  color: #888;
}

.sticker-no-results {
  color: #888;
  text-align: center;
  padding: 20px;
  font-size: 14px;
}

/* --- Sticker packs list --- */
.sticker-pack-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 6px 12px 15px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  flex: 1;
}

.sticker-pack-btn {
  display: flex;
  align-items: center;
  gap: 15px;
  width: 100%;
  padding: 12px 18px;
  border: none;
  border-radius: 15px;
  background: #333;
  color: #fff;
  cursor: pointer;
  transition: transform 0.1s, background 0.15s;
  -webkit-user-select: none;
  user-select: none;
  text-align: left;
}

.sticker-pack-btn:active {
  transform: scale(0.98);
}

.sticker-pack-btn.active {
  background: #555;
  box-shadow: inset 0 0 0 2px #fff;
}

.sticker-pack-btn .pack-icon {
  font-size: 42px;
  flex-shrink: 0;
}

.sticker-pack-btn .pack-name {
  font-size: 21px;
  font-weight: 600;
  flex-shrink: 0;
  min-width: 120px;
}

.sticker-pack-btn .pack-preview {
  font-size: 24px;
  opacity: 0.6;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* --- Shape overlay (live preview while dragging) --- */
#shape-overlay {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 4;
  display: none;
}

/* --- Shape picker --- */
#shape-picker {
  display: flex;
  gap: 6px;
  background: #2a2a2a;
  padding: 9px;
  border-radius: 18px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
}

.shape-opt {
  width: 60px;
  height: 60px;
  border: 3px solid transparent;
  border-radius: 15px;
  background: #333;
  color: #fff;
  font-size: 30px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, border-color 0.15s;
  -webkit-user-select: none;
  user-select: none;
}

.shape-opt:active {
  transform: scale(0.9);
}

.shape-opt.active {
  border-color: #fff;
  background: #555;
}

.shape-fill-toggle {
  width: 60px;
  height: 60px;
  border: 3px solid transparent;
  border-radius: 15px;
  background: #333;
  color: #fff;
  font-size: 27px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s;
  -webkit-user-select: none;
  user-select: none;
}

.shape-fill-toggle.active {
  border-color: #fff;
  background: #555;
}

.shape-fill-toggle:active {
  transform: scale(0.9);
}

/* --- Sticker cursor preview --- */
#sticker-cursor {
  position: absolute;
  pointer-events: none;
  font-size: 48px;
  transform: translate(-50%, -50%);
  z-index: 5;
  opacity: 0.7;
  display: none;
}

/* --- Responsive --- */
@media (max-width: 500px) {
  #app { grid-template-rows: 1fr 96px; }
  .tool-btn, .action-btn { width: 66px; height: 66px; }
  .tool-icon { font-size: 30px; }
  .action-btn { font-size: 27px; }
  #brush-size { width: 180px; }
  .color-btn { width: 50px; height: 50px; }
  .toolbar-hint, .toolbar-chip, .toolbar-inline-btn, .toolbar-more-btn { min-height: 52px; font-size: 17px; padding: 0 16px; }
  .toolbar-choice-btn { min-height: 52px; font-size: 17px; gap: 10px; padding: 0 14px; }
  .toolbar-choice-icon { font-size: 24px; }
  .sticker-quick-btn { width: 52px; height: 52px; font-size: 30px; }
  .shape-opt, .shape-fill-toggle { width: 52px; height: 52px; font-size: 26px; }
  .sticker-btn { font-size: 36px; }
  .sticker-tab { width: 54px; height: 54px; font-size: 26px; }
  .sticker-emoji-grid { grid-template-columns: repeat(auto-fill, minmax(66px, 1fr)); }
  #sidebar { padding: 9px; }
  #bottom-bar { padding: 12px 15px; gap: 12px; }
}