:root {
  --bg-primary: #1a1a1a;
  --bg-secondary: #242424;
  --bg-tertiary: #2e2e2e;
  --bg-hover: #353535;
  --bg-active: #3a3a3a;
  --text-primary: #e0e0e0;
  --text-secondary: #999;
  --accent: #4a9eff;
  --accent-hover: #6ab4ff;
  --danger: #ff4a4a;
  --border: #3a3a3a;
  --radius: 4px;
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 13px;
  line-height: 1.4;
  overflow: hidden;
  height: 100vh;
  user-select: none;
}

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

/* ---- Toolbar ---- */
#toolbar {
  display: flex;
  align-items: center;
  padding: 6px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  gap: 6px;
}

.app-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-right: 12px;
  color: var(--text-primary);
  text-transform: uppercase;
}

.toolbar-group {
  display: flex;
  gap: 4px;
}

#export-progress {
  margin-left: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 240px;
}
#export-progress[hidden] { display: none; }
#export-progress-label {
  font-size: 11px;
  color: var(--text-secondary);
  min-width: 78px;
}
#export-progress-track {
  width: 170px;
  height: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}
#export-progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #45c778 0%, var(--accent) 100%);
  transition: width 0.16s ease;
}
#btn-export:disabled {
  opacity: 0.65;
  cursor: wait;
}

button {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 12px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.15s;
  white-space: nowrap;
}
button:hover { background: var(--bg-hover); }
button:active { background: var(--bg-active); }

/* ---- Main Layout ---- */
#main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ---- Layers Panel ---- */
#layers-panel {
  width: 200px;
  min-width: 200px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.panel-header h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  font-weight: 600;
}
.panel-header button {
  width: 24px;
  height: 24px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: bold;
}

.add-layer-wrap {
  position: relative;
}
.add-layer-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  min-width: 130px;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}
.add-layer-menu[hidden] { display: none; }
.add-layer-menu button {
  width: 100%;
  height: auto;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: normal;
  text-align: left;
  justify-content: flex-start;
  border: none;
  border-radius: 0;
  background: transparent;
}
.add-layer-menu button:hover { background: var(--bg-hover); }
.add-layer-menu button + button { border-top: 1px solid var(--border); }

#layers-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px;
}

.layer-item {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  margin-bottom: 2px;
  border-radius: var(--radius);
  cursor: pointer;
  gap: 6px;
  border: 1px solid transparent;
}
.layer-item:hover { background: var(--bg-tertiary); }
.layer-item.selected {
  background: var(--bg-tertiary);
  border-color: var(--accent);
}

.layer-info {
  flex: 1;
  min-width: 0;
}
.layer-name {
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: text;
}

.layer-name-input {
  font-size: 12px;
  width: 100%;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1px 4px;
  outline: none;
}
.layer-lut {
  font-size: 10px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.layer-item .btn-icon {
  background: none;
  border: none;
  padding: 2px 4px;
  font-size: 14px;
  min-width: 22px;
  opacity: 0.6;
  text-align: center;
}
.layer-item .btn-icon:hover { opacity: 1; }
.layer-item .btn-delete {
  color: var(--danger);
  opacity: 0;
  font-size: 12px;
}
.layer-item:hover .btn-delete { opacity: 0.6; }
.layer-item .btn-delete:hover { opacity: 1; }

/* ---- Canvas Area ---- */
#canvas-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: #111;
  overflow: hidden;
}

#canvas-main {
  max-width: 100%;
  max-height: 100%;
  display: block;
  image-rendering: auto;
  transform-origin: center center;
  will-change: transform;
}
#canvas-main.panning { cursor: grabbing !important; }
#canvas-main.pan-ready { cursor: grab !important; }

/* ---- Zoom controls overlay ---- */
#zoom-controls {
  position: absolute;
  bottom: 10px;
  right: 10px;
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
  z-index: 60;
  backdrop-filter: blur(4px);
  user-select: none;
}
#zoom-controls button {
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 26px;
  height: 22px;
  padding: 0;
  font-size: 14px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
}
#zoom-controls button:hover { background: var(--bg-hover); }
#zoom-controls button:active { background: var(--bg-active); }
#zoom-indicator {
  font-size: 11px;
  color: var(--text-primary);
  min-width: 44px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  padding: 0 4px;
}
#zoom-indicator:hover { color: var(--accent); }

#drop-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-secondary);
  font-size: 16px;
  pointer-events: none;
}
#drop-overlay.hidden { display: none; }
#drop-overlay.drag-over {
  background: rgba(74, 158, 255, 0.08);
  border: 2px dashed var(--accent);
  pointer-events: all;
}

/* ---- Properties Panel ---- */
#properties-panel {
  width: 250px;
  min-width: 250px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow-y: auto;
}

#props-content { padding: 8px 10px; }
#no-layer-msg {
  padding: 30px 16px;
  text-align: center;
  color: var(--text-secondary);
  line-height: 1.6;
}

.panel-section {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.panel-section:last-child { border-bottom: none; }
.panel-section h4 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 600;
}

select {
  width: 100%;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 6px;
  font-size: 12px;
  cursor: pointer;
}

/* ---- LUT grid ---- */
.lut-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}
.lut-section-header h4 { margin-bottom: 0; }
.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 11px;
  padding: 2px 4px;
  cursor: pointer;
}
.btn-link:hover { color: var(--accent-hover); background: none; }

#lut-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
  max-height: 360px;
  overflow-y: auto;
  padding-right: 2px;
}
.lut-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.12s, transform 0.08s;
  display: flex;
  flex-direction: column;
}
.lut-card:hover { border-color: var(--bg-hover); }
.lut-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset;
}
.lut-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  display: block;
  background: #000;
  object-fit: cover;
  image-rendering: auto;
}
.lut-card-name {
  font-size: 10px;
  padding: 4px 5px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  background: var(--bg-tertiary);
}
.lut-card.selected .lut-card-name {
  background: var(--accent);
  color: #fff;
}
.lut-group-label {
  grid-column: 1 / -1;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-top: 4px;
}
.lut-group-label:first-child { margin-top: 0; }

/* Layer item type badge */
.layer-type-badge {
  font-size: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 1px 4px;
  border-radius: 2px;
  background: var(--bg-active);
  color: var(--text-secondary);
  margin-right: 4px;
}
.layer-type-badge.lut { background: #2a4a6a; color: #b0d4ff; }
.layer-type-badge.adj { background: #4a3a2a; color: #ffd4a0; }
.layer-type-badge.blur { background: #3a2a4a; color: #d4b0ff; }

.hint {
  font-size: 10px;
  color: var(--text-secondary);
  margin-top: 6px;
  line-height: 1.4;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}
.slider-row span {
  font-size: 11px;
  color: var(--text-secondary);
  min-width: 35px;
  text-align: right;
}

#mask-tools {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
}
.mask-tool-btn {
  font-size: 11px;
  padding: 4px 2px;
  text-align: center;
}
.mask-tool-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.mask-actions {
  display: flex;
  gap: 4px;
}
.mask-actions button {
  flex: 1;
  font-size: 11px;
  padding: 4px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 12px;
}

/* ---- Adjustments ---- */
.adj-channel-label {
  margin-top: 4px;
  font-size: 10px !important;
  font-weight: 500 !important;
}

.color-balance-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 3px;
}
.color-balance-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}
.cb-label {
  font-size: 9px;
  color: var(--text-secondary);
  min-width: 28px;
  text-align: center;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border); }

/* ---- Nerd stats overlay ---- */
#nerd-stats {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 6px 8px;
  background: rgba(0, 0, 0, 0.65);
  color: #b8f0b8;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  line-height: 1.35;
  border-radius: var(--radius);
  pointer-events: none;
  white-space: pre;
  z-index: 50;
  backdrop-filter: blur(2px);
}
#nerd-stats .nerd-key { color: #888; }

/* ---- Histogram overlay ---- */
#histogram-panel {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.65);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  z-index: 55;
  backdrop-filter: blur(4px);
  user-select: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
#histogram-panel.hidden { display: none; }
#histogram-canvas {
  display: block;
  width: 256px;
  height: 110px;
  border-radius: 2px;
  background: #0a0a0a;
}
#histogram-modes {
  display: flex;
  gap: 2px;
  align-items: center;
}
#histogram-modes .histo-mode {
  flex: 1;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 2px 4px;
  font-size: 10px;
  border-radius: 2px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
#histogram-modes .histo-mode:hover { background: var(--bg-hover); color: var(--text-primary); }
#histogram-modes .histo-mode.active {
  background: var(--bg-active);
  color: var(--text-primary);
  border-color: var(--border);
}
#histo-close {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  padding: 0;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  border-radius: 2px;
}
#histo-close:hover { background: var(--bg-hover); color: var(--text-primary); }

#btn-show-histogram {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 55;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 4px 8px;
  font-size: 11px;
  border-radius: var(--radius);
  cursor: pointer;
}
#btn-show-histogram:hover { background: var(--bg-hover); }
#btn-show-histogram.hidden { display: none; }