@import url('https://fonts.googleapis.com/css2?family=Russo+One&family=Orbitron:wght@400;500;600;700;800;900&family=Rajdhani:wght@300;400;500;600;700&display=swap');

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

:root {
  --accent: #bcfd00;
  --accent-dim: rgba(188, 253, 0, 0.15);
  --accent-glow: rgba(188, 253, 0, 0.4);
  --bg-deep: #000000;
  --bg-panel: #0a0a0a;
  --bg-surface: #111111;
  --bg-hover: #1a1a1a;
  --border: #1e1e1e;
  --border-accent: #2a2a2a;
  --text: #d0d0d0;
  --text-dim: #666;
  --text-muted: #444;
}

body {
  background: var(--bg-deep);
  color: var(--text);
  font-family: 'Rajdhani', 'Segoe UI', system-ui, sans-serif;
  font-weight: 500;
  overflow: hidden;
  height: 100vh;
}

#app {
  display: flex;
  height: 100vh;
}

/* ===== Sidebar ===== */
#sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: width 0.2s, min-width 0.2s;
  position: relative;
}

#sidebar.collapsed {
  width: 0;
  min-width: 0;
  border-right: none;
}

#sidebar.collapsed > *:not(#sidebar-toggle) {
  display: none;
}

#sidebar-toggle {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: -28px;
  width: 24px;
  height: 24px;
  background: var(--bg-panel);
  border: 1px solid var(--border-accent);
  border-radius: 0 4px 4px 0;
  color: var(--accent);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: all 0.15s;
  padding: 0;
  line-height: 1;
}

#sidebar-toggle:hover {
  background: var(--accent);
  color: #000;
}

#sidebar h1 {
  padding: 12px 16px 2px;
  font-family: 'Russo One', sans-serif;
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 3px;
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent-glow);
}

#sidebar .subtitle {
  padding: 0 16px 14px;
  font-family: 'Orbitron', sans-serif;
  font-size: 9px;
  font-weight: 400;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 4px;
  border-bottom: 1px solid var(--border);
}

#sprite-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

.category {
  margin-bottom: 2px;
}

.category-header {
  padding: 8px 16px;
  font-family: 'Orbitron', sans-serif;
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.15s;
}

.category-header:hover {
  background: var(--accent-dim);
}

.category-header .count {
  font-family: 'Rajdhani', sans-serif;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-surface);
  padding: 1px 6px;
  border-radius: 3px;
}

.category-header .arrow {
  transition: transform 0.2s;
  font-size: 8px;
  color: var(--text-muted);
}

.category-header.collapsed .arrow {
  transform: rotate(-90deg);
}

.category-items {
  overflow: hidden;
}

.category-items.collapsed {
  display: none;
}

.sprite-item {
  padding: 5px 16px 5px 24px;
  font-size: 13px;
  font-weight: 400;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-dim);
  transition: all 0.12s;
  border-left: 2px solid transparent;
}

.sprite-item:hover {
  background: var(--bg-hover);
  color: var(--text);
  border-left-color: var(--accent);
}

.sprite-item.active {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
  border-left-color: var(--accent);
}

.sprite-item .ext {
  font-size: 10px;
  color: var(--text-muted);
  margin-left: 4px;
}

/* ===== Main Area ===== */
#main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-deep);
}

/* ===== Toolbar ===== */
#toolbar {
  display: flex;
  gap: 20px;
  padding: 10px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  align-items: center;
}

.tool-group {
  display: flex;
  gap: 10px;
  align-items: center;
}

.tool-group label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.5px;
}

.tool-group input[type="number"] {
  width: 56px;
  background: var(--bg-deep);
  border: 1px solid var(--border-accent);
  color: var(--accent);
  padding: 5px 6px;
  border-radius: 3px;
  font-family: 'Rajdhani', sans-serif;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.tool-group input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 6px var(--accent-dim);
}

.tool-group input[type="range"] {
  width: 100px;
  accent-color: var(--accent);
  cursor: pointer;
}

.tool-group input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
}

.tool-group button {
  background: var(--accent);
  color: #000;
  border: none;
  padding: 6px 14px;
  border-radius: 3px;
  font-family: 'Rajdhani', sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s;
}

.tool-group button:hover {
  background: #d4ff4a;
  box-shadow: 0 0 12px var(--accent-glow);
}

.tool-group button:disabled {
  background: var(--border-accent);
  color: var(--text-muted);
  cursor: not-allowed;
  box-shadow: none;
}

.tool-group span {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  min-width: 32px;
  opacity: 0.7;
}

/* ===== Info Bar ===== */
#info-bar {
  padding: 6px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 400;
  color: var(--text-dim);
  letter-spacing: 0.3px;
}

/* ===== Canvas Area ===== */
#canvas-container {
  flex: 1;
  overflow: auto;
  padding: 20px;
  min-height: 0;
  background: var(--bg-deep);
}

#sprite-canvas {
  image-rendering: pixelated;
  cursor: pointer;
  display: block;
}

.hidden {
  display: none !important;
}

#gif-display {
  image-rendering: pixelated;
  display: block;
  max-width: 100%;
  background: var(--bg-deep);
}

#gif-preview {
  image-rendering: pixelated;
  max-height: 180px;
  background: var(--bg-deep);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
}

/* ===== Bottom Panel ===== */
#bottom-panel {
  display: flex;
  gap: 0;
  background: var(--bg-panel);
  border-top: 1px solid var(--accent);
  min-height: 140px;
  max-height: 220px;
  flex-shrink: 1;
  overflow: hidden;
}

/* ===== Animation Preview ===== */
#animation-preview {
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  min-width: 0;
}

#animation-preview h3 {
  font-family: 'Orbitron', sans-serif;
  font-size: 9px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  writing-mode: vertical-lr;
  transform: rotate(180deg);
  opacity: 0.6;
}

#anim-canvas {
  image-rendering: pixelated;
  background: var(--bg-deep);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  max-height: 180px;
}

#anim-info {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  line-height: 1.8;
}

/* ===== Layer Panel ===== */
#layer-panel {
  padding: 14px 20px;
  border-left: 1px solid var(--border);
  flex: 1;
  min-width: 0;
}

#layer-panel.hidden {
  display: none;
}

#layer-panel h3 {
  font-family: 'Orbitron', sans-serif;
  font-size: 9px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

#layer-content {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

#layer-controls {
  flex: 1;
  min-width: 0;
}

#layer-slots {
  display: flex;
  gap: 4px 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.layer-slot {
  display: flex;
  align-items: center;
  gap: 4px;
}

.layer-slot label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.layer-slot select {
  background: var(--bg-deep);
  border: 1px solid var(--border-accent);
  color: var(--text);
  padding: 3px 6px;
  border-radius: 3px;
  font-family: 'Rajdhani', sans-serif;
  font-size: 12px;
  font-weight: 500;
  max-width: 150px;
  cursor: pointer;
}

.layer-slot select:focus {
  outline: none;
  border-color: var(--accent);
}

#composite-canvas {
  image-rendering: pixelated;
  background: var(--bg-deep);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  flex-shrink: 0;
}

/* ===== Scrollbars ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-surface);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 5px;
  border: 2px solid var(--bg-surface);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

::-webkit-scrollbar-thumb:active {
  background: var(--accent);
}

/* ===== Drop Zone ===== */
#drop-zone {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  height: 100%;
  border: 2px dashed var(--border-accent);
  border-radius: 12px;
  transition: all 0.2s;
}

#drop-zone.hidden {
  display: none !important;
}

#drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-dim);
  box-shadow: inset 0 0 40px rgba(188, 253, 0, 0.05);
}

.drop-zone-content {
  text-align: center;
  color: var(--text-dim);
}

.drop-icon {
  color: var(--accent);
  opacity: 0.4;
  margin-bottom: 16px;
}

#drop-zone h2 {
  font-family: 'Russo One', sans-serif;
  font-size: 20px;
  font-weight: 400;
  color: var(--text);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.drop-or {
  font-size: 13px;
  color: var(--text-muted);
  margin: 10px 0;
}

.file-picker-btn {
  display: inline-block;
  background: var(--accent);
  color: #000;
  padding: 10px 28px;
  border-radius: 4px;
  font-family: 'Rajdhani', sans-serif;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s;
}

.file-picker-btn:hover {
  background: #d4ff4a;
  box-shadow: 0 0 16px var(--accent-glow);
}

.drop-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 14px;
  letter-spacing: 0.3px;
}

/* Firefox scrollbar */
* {
  scrollbar-width: auto;
  scrollbar-color: var(--text-muted) var(--bg-surface);
}