:root {
  --bg: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --fg: #0f172a;
  --fg-secondary: #475569;
  --fg-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --success: #059669;
  --success-light: #d1fae5;
  --error: #dc2626;
  --error-light: #fee2e2;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.1), 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
  --radius: 8px;
  --radius-sm: 6px;
  --transition: 150ms ease;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --fg: #f8fafc;
    --fg-secondary: #cbd5e1;
    --fg-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-light: #1e3a5f;
    --border: #334155;
    --border-strong: #475569;
    --success: #10b981;
    --success-light: #064e3b;
    --error: #ef4444;
    --error-light: #7f1d1d;
    --warning: #f59e0b;
    --warning-light: #78350f;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  }
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --fg: #0f172a;
  --fg-secondary: #475569;
  --fg-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --success: #059669;
  --success-light: #d1fae5;
  --error: #dc2626;
  --error-light: #fee2e2;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.1), 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background var(--transition), color var(--transition);
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
}

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--accent);
  flex-shrink: 0;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--fg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: opacity var(--transition), transform var(--transition);
}

[data-theme="light"] .sun-icon,
:root:not([data-theme="light"]) .moon-icon {
  display: none;
}

.main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  padding: 48px 24px;
  text-align: center;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-light);
}

.drop-zone.drag-over .drop-zone-content {
  opacity: 0;
  pointer-events: none;
}

.drop-zone.drag-over .drop-zone-overlay {
  display: flex !important;
}

.drop-zone-content {
  transition: opacity var(--transition);
}

.drop-icon {
  width: 48px;
  height: 48px;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.drop-text {
  font-size: 1.125rem;
  color: var(--fg);
  margin-bottom: 8px;
}

.browse-btn {
  background: none;
  border: none;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.browse-btn:hover {
  color: var(--accent-hover);
}

.drop-hint {
  font-size: 0.875rem;
  color: var(--fg-muted);
}

.drop-zone-overlay {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--accent-light);
  border-radius: calc(var(--radius) - 2px);
  color: var(--accent);
  font-weight: 600;
}

.drop-zone-overlay .drop-icon {
  color: var(--accent);
}

.queue-section,
.settings-panel,
.results-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.queue-header,
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.queue-header h2,
.results-header h2,
.settings-panel h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--fg);
}

#queueCount,
#resultCount {
  background: var(--accent-light);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.queue-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--fg-secondary);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.queue-list,
.results-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.queue-item,
.result-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.queue-item:hover,
.result-item:hover {
  border-color: var(--border-strong);
}

.item-thumb {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: var(--bg-tertiary);
  flex-shrink: 0;
}

.item-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.item-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.item-meta {
  font-size: 0.75rem;
  color: var(--fg-muted);
  font-family: var(--font-mono);
}

.item-progress {
  width: 100px;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  flex-shrink: 0;
}

.item-progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 200ms ease;
  width: 0%;
}

.item-status {
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.item-status.pending {
  color: var(--fg-muted);
}

.item-status.processing {
  color: var(--warning);
}

.item-status.done {
  color: var(--success);
}

.item-status.error {
  color: var(--error);
}

.item-actions {
  display: flex;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), opacity var(--transition);
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--fg);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border);
}

.btn-ghost {
  background: transparent;
  color: var(--fg-secondary);
  padding: 6px 10px;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-tertiary);
  color: var(--fg);
}

.btn-danger {
  background: var(--error-light);
  color: var(--error);
}

.btn-danger:hover:not(:disabled) {
  background: var(--error);
  color: white;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.setting-group:last-of-type {
  margin-bottom: 0;
}

.setting-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--fg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.setting-group label > span {
  color: var(--fg-muted);
  font-weight: 400;
  font-size: 0.8125rem;
}

.setting-group select,
.setting-group input[type="number"] {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  font-size: 0.875rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.setting-group select:focus,
.setting-group input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.setting-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.resize-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}

.result-item .item-actions {
  flex-wrap: wrap;
}

.result-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.result-size {
  font-size: 0.75rem;
  color: var(--fg-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.result-size.saved {
  color: var(--success);
}

.footer {
  padding: 24px 16px;
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  margin-top: auto;
}

.footer p {
  font-size: 0.8125rem;
  color: var(--fg-muted);
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.shortcuts {
  margin-top: 8px;
  font-size: 0.75rem;
}

.shortcuts kbd {
  display: inline-block;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 1px 0 var(--border);
}

@media (min-width: 640px) {
  .main {
    padding: 32px 24px;
  }

  .drop-zone {
    padding: 64px 32px;
  }

  .queue-item,
  .result-item {
    grid-template-columns: auto 1fr auto auto;
  }

  .item-progress {
    width: 140px;
  }
}

@media (min-width: 1024px) {
  .main {
    padding: 48px 32px;
  }

  .queue-section,
  .settings-panel,
  .results-section {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .queue-header,
  .results-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .queue-actions {
    width: 100%;
    justify-content: space-between;
  }

  .resize-options {
    grid-template-columns: 1fr;
  }

  .item-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}