:root {
  --bg: #f8f9fa;
  --card: #ffffff;
  --text: #1a1a2e;
  --muted: #6c757d;
  --border: #e2e8f0;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app { max-width: 1200px; margin: 0 auto; padding: 20px; }

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.header h1 { font-size: 24px; }
.subtitle { color: var(--muted); font-size: 14px; margin-left: 8px; }
.header-right { display: flex; gap: 16px; }
.stat { color: var(--muted); font-size: 14px; }

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  background: var(--card);
  transition: all 0.2s;
  cursor: pointer;
  margin-bottom: 20px;
}
.upload-zone.drag-over {
  border-color: var(--primary);
  background: rgba(59, 130, 246, 0.04);
}
.upload-icon { font-size: 48px; margin-bottom: 12px; }
.upload-hint { color: var(--muted); font-size: 13px; margin-top: 8px; }
.upload-link {
  color: var(--primary);
  cursor: pointer;
  text-decoration: underline;
}
.upload-link:hover { color: var(--primary-hover); }
.upload-progress { margin-top: 16px; }
.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  width: 0;
  transition: width 0.3s;
}
.progress-text { color: var(--muted); font-size: 13px; margin-top: 6px; }

/* Toolbar */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  gap: 12px;
  flex-wrap: wrap;
}
.toolbar-left { display: flex; gap: 8px; }
.search-input {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  width: 240px;
  outline: none;
  transition: border-color 0.2s;
}
.search-input:focus { border-color: var(--primary); }

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
}
.btn-outline {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover { background: var(--bg); }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* Gallery Grid */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.gallery-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--muted);
  padding: 60px 0;
}

/* Gallery Item */
.gallery-item {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.2s;
  position: relative;
}
.gallery-item:hover { box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); transform: translateY(-2px); }
.gallery-item.selected { outline: 3px solid var(--primary); outline-offset: -3px; }
.gallery-item img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  display: block;
  cursor: pointer;
}
.gallery-item-info {
  padding: 10px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.gallery-item-name {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  margin-right: 8px;
}
.gallery-item-size { color: var(--muted); font-size: 12px; white-space: nowrap; }
.gallery-item-actions {
  padding: 0 12px 10px;
  display: flex;
  gap: 6px;
}
.gallery-item-actions .btn { flex: 1; text-align: center; font-size: 12px; padding: 5px 0; }

/* Checkbox */
.gallery-checkbox {
  position: absolute;
  top: 8px;
  left: 8px;
  width: 22px;
  height: 22px;
  cursor: pointer;
  accent-color: var(--primary);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: white;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 999;
  transition: opacity 0.3s;
  pointer-events: none;
}
.toast.hidden { opacity: 0; }
.toast.error { background: var(--danger); }

/* Hidden */
.hidden { display: none !important; }

/* Responsive */
@media (max-width: 640px) {
  .gallery { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .search-input { width: 100%; }
  .toolbar { flex-direction: column; align-items: stretch; }
}