:root {
  --bg: #1a1a2e;
  --bg2: #16213e;
  --bg3: #0f3460;
  --text: #e0e0e0;
  --text2: #a0a0b0;
  --border: #3a3a5a;
  --accent: #4a9eff;
  --success: #00c853;
  --warning: #ff9800;
  --danger: #f44336;
  --confirmed: #00c853;
  --needs-ai: #ff9800;
  --btn-bg: #2a2a4a;
  --btn-hover: #3a3a5a;
  --panel-bg: #1e1e3a;
}

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

body {
  font-family: "Microsoft YaHei UI", -apple-system, "Segoe UI", sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.header h1 {
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
}
.header .status {
  font-size: 12px;
  color: var(--text2);
}

/* Main layout */
.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Left panel: canvas */
.canvas-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  border-right: 1px solid var(--border);
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.canvas-container {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: #0d0d1a;
  cursor: grab;
}
.canvas-container.dragging { cursor: grabbing; }

#mainCanvas {
  position: absolute;
  transform-origin: 0 0;
}

/* Upload overlay */
.upload-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
  background: rgba(26, 26, 46, 0.9);
  border: 3px dashed var(--border);
  margin: 20px;
  border-radius: 12px;
  transition: border-color 0.2s;
}
.upload-overlay.drag-over {
  border-color: var(--accent);
  background: rgba(74, 158, 255, 0.1);
}
.upload-overlay .icon { font-size: 48px; margin-bottom: 12px; opacity: 0.6; }
.upload-overlay p { color: var(--text2); margin: 4px 0; }
.upload-overlay .hint { font-size: 11px; }
.upload-overlay.hidden { display: none; }

/* Right panel */
.right-panel {
  width: 420px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
}

/* Stats panel */
.stats-panel {
  padding: 10px 14px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 6px;
}
.stat-box {
  text-align: center;
  padding: 6px;
  background: var(--panel-bg);
  border-radius: 6px;
}
.stat-box .val {
  font-size: 20px;
  font-weight: 700;
}
.stat-box .lbl {
  font-size: 10px;
  color: var(--text2);
  margin-top: 2px;
}
.stat-box.confirmed .val { color: var(--confirmed); }
.stat-box.needs-ai .val { color: var(--needs-ai); }
.quality-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}
.quality-good { background: #1b5e20; color: #69f0ae; }
.quality-fair { background: #e65100; color: #ffcc80; }
.quality-poor { background: #b71c1c; color: #ef9a9a; }

/* Results table */
.results-panel {
  flex: 1;
  overflow: auto;
  padding: 0;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.results-table th {
  position: sticky;
  top: 0;
  background: var(--bg2);
  padding: 6px 8px;
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  z-index: 2;
}
.results-table td {
  padding: 5px 8px;
  border-bottom: 1px solid rgba(58, 58, 90, 0.4);
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.results-table tr { cursor: pointer; }
.results-table tr:hover { background: rgba(74, 158, 255, 0.08); }
.results-table tr.selected { background: rgba(74, 158, 255, 0.18); }
.results-table tr.cls-confirmed td:first-child {
  border-left: 3px solid var(--confirmed);
}
.results-table tr.cls-needs_ai td:first-child {
  border-left: 3px solid var(--needs-ai);
}

.conf-bar {
  display: inline-block;
  height: 6px;
  border-radius: 3px;
  min-width: 20px;
}
.conf-high { background: var(--confirmed); }
.conf-med { background: var(--warning); }
.conf-low { background: var(--danger); }

/* Buttons */
.btn {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--btn-bg);
  color: var(--text);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.btn:hover { background: var(--btn-hover); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: #3888e0; }
.btn-primary:disabled { background: var(--btn-bg); border-color: var(--border); }

.btn-sm { padding: 3px 10px; font-size: 11px; }

/* File input */
.file-input-wrapper {
  position: relative;
  overflow: hidden;
}
.file-input-wrapper input[type="file"] {
  position: absolute;
  left: -9999px;
}

/* Toggle */
.toggle-group {
  display: flex;
  gap: 4px;
}
.toggle-group .btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Zoom display */
.zoom-display {
  font-size: 11px;
  color: var(--text2);
  min-width: 50px;
  text-align: center;
}

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 4px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Ink detect button */
.btn-ink {
  border-color: #f44336;
  color: #ef9a9a;
}
.btn-ink:hover { background: #4a1a1a; }

/* Sprite button */
.btn-sprite {
  border-color: #9c27b0;
  color: #ce93d8;
}
.btn-sprite:hover { background: #3a1a4a; }

/* Sprite preview panel */
.sprite-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 520px;
  height: 100vh;
  background: var(--bg2);
  border-left: 2px solid var(--accent);
  z-index: 100;
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 20px rgba(0,0,0,0.5);
}
.sprite-panel.hidden { display: none; }
.sprite-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sprite-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}
.sprite-batch {
  margin-bottom: 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.sprite-batch-title {
  padding: 6px 12px;
  background: var(--panel-bg);
  font-weight: 600;
  font-size: 12px;
  border-bottom: 1px solid var(--border);
}
.sprite-img {
  width: 100%;
  display: block;
  background: #1a1a1a;
}
.sprite-prompt-label {
  padding: 6px 12px 2px;
  font-size: 11px;
  color: var(--text2);
  font-weight: 600;
}
.sprite-prompt {
  margin: 0;
  padding: 8px 12px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--text);
  background: var(--panel-bg);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 200px;
  overflow-y: auto;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #555; }