:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #818cf8;
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --transition: all 0.2s ease;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-tertiary: #6b7280;
  --border-color: #e5e7eb;
  --card-bg: #ffffff;
  --input-bg: #ffffff;
  --hover-bg: #f3f4f6;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --border-color: #334155;
  --card-bg: #1e293b;
  --input-bg: #1e293b;
  --hover-bg: #334155;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: var(--transition);
}

.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  background: var(--gray-400);
  cursor: not-allowed;
  transform: none;
}

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

.btn-secondary:hover {
  background: var(--hover-bg);
  border-color: var(--primary);
}

.btn-text {
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 12px;
}

.btn-text:hover {
  color: var(--primary);
}

.btn-icon {
  padding: 8px;
  background: transparent;
  border: 1px solid var(--border-color);
  font-size: 1.2rem;
}

.btn-icon:hover {
  background: var(--hover-bg);
}

.btn-large {
  width: 100%;
  padding: 14px 24px;
  font-size: 1.1rem;
}

.btn-small {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  background: var(--bg-secondary);
  padding: 6px;
  border-radius: var(--radius);
}

.tab-btn {
  flex: 1;
  padding: 12px 24px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--card-bg);
  color: var(--primary);
  box-shadow: var(--shadow);
}

.content-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

@media (max-width: 1024px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }
}

.input-panel, .result-panel {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border-color);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-primary);
}

.required {
  color: var(--error);
}

.optional {
  font-weight: 400;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

.prompt-input, .input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: 1rem;
  resize: vertical;
  transition: var(--transition);
}

.prompt-input:focus, .input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-hint {
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.input-with-action {
  display: flex;
  gap: 8px;
}

.input-with-action .input {
  flex: 1;
}

.template-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.template-tag {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.template-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.upload-zone {
  position: relative;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-secondary);
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
}

.upload-zone-small {
  padding: 20px;
  min-width: 100px;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-placeholder {
  color: var(--text-tertiary);
}

.upload-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 8px;
}

.upload-zone-small .upload-icon {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.upload-zone-small p {
  font-size: 0.75rem;
}

.upload-hint {
  font-size: 0.8rem;
  margin-top: 4px;
}

.upload-preview {
  max-width: 100%;
  max-height: 300px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.btn-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: var(--error);
  color: white;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-remove:hover {
  transform: scale(1.1);
}

.reference-images-container {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.reference-previews {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.video-mode-selector {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.video-mode-card {
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: var(--radius);
  padding: 16px;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.video-mode-card strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.video-mode-card span {
  display: block;
  font-size: 0.82rem;
  line-height: 1.5;
}

.video-mode-card:hover,
.video-mode-card.active {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-1px);
}

.video-subpanel {
  display: none;
}

.video-subpanel.active {
  display: block;
}

.single-frame-layout {
  grid-template-columns: minmax(0, 1fr);
}

.reference-video-container {
  align-items: flex-start;
}

.reference-preview-item {
  position: relative;
  width: 100px;
  height: 100px;
}

.reference-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.reference-preview-item .btn-remove {
  width: 22px;
  height: 22px;
  font-size: 0.8rem;
  top: -6px;
  right: -6px;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.result-header h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
}

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

.result-content {
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  overflow: hidden;
}

.result-placeholder {
  text-align: center;
  color: var(--text-tertiary);
}

.placeholder-icon {
  font-size: 4rem;
  display: block;
  margin-bottom: 12px;
  opacity: 0.5;
}

.result-image {
  max-width: 100%;
  max-height: 500px;
  object-fit: contain;
  cursor: pointer;
  transition: var(--transition);
}

.result-image:hover {
  transform: scale(1.02);
}

.result-info {
  margin-top: 16px;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

.info-item {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.info-item:last-child {
  margin-bottom: 0;
}

.info-label {
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.info-value {
  color: var(--text-secondary);
  word-break: break-all;
}

.history-section {
  margin-bottom: 40px;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.history-header h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
}

.history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
}

.history-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px;
  color: var(--text-tertiary);
}

.history-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.history-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.history-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.history-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 12px;
}

.history-item:hover .history-item-overlay {
  opacity: 1;
}

.history-item-actions {
  display: flex;
  gap: 6px;
}

.history-item-actions button {
  flex: 1;
  padding: 6px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  background: rgba(255,255,255,0.9);
  color: var(--gray-800);
}

.history-item-actions button:hover {
  background: white;
}

.history-item-delete {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 50%;
  background: rgba(0,0,0,0.6);
  color: white;
  font-size: 0.8rem;
  cursor: pointer;
  opacity: 0;
  transition: var(--transition);
}

.history-item:hover .history-item-delete {
  opacity: 1;
}

.history-item-delete:hover {
  background: var(--error);
}

.history-item.dragging {
  opacity: 0.5;
  transform: scale(0.95);
}

.history-item[draggable="true"] {
  cursor: grab;
}

.history-item[draggable="true"]:active {
  cursor: grabbing;
}

.frame-upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
  transform: scale(1.02);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 480px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-large {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-header h3 {
  font-size: 1.2rem;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--error);
  color: white;
}

.modal-footer {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.modal-image {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius);
}

.modal-image-actions {
  margin-top: 16px;
  display: flex;
  gap: 12px;
}

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  background: var(--card-bg);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--primary);
  animation: slideIn 0.3s ease;
  max-width: 360px;
}

.toast.success {
  border-left-color: var(--success);
}

.toast.error {
  border-left-color: var(--error);
}

.toast.warning {
  border-left-color: var(--warning);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.hidden {
  display: none !important;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  border-radius: var(--radius);
  color: white;
}

@media (max-width: 768px) {
  .app-container {
    padding: 0 16px;
  }

  .header {
    flex-wrap: wrap;
    gap: 12px;
  }

  .logo {
    font-size: 1.2rem;
  }

  .content-wrapper {
    gap: 16px;
  }

  .input-panel, .result-panel {
    padding: 16px;
  }

  .tabs {
    padding: 4px;
  }

  .tab-btn {
    padding: 10px 16px;
    font-size: 0.9rem;
  }

  .history-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
  }
}

/* 比例选择器 */
.ratio-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.ratio-card {
  flex: 1;
  min-width: 70px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 8px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.ratio-preview-wrapper {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ratio-card:hover {
  border-color: var(--primary-light);
  background: var(--hover-bg);
}

.ratio-card.active {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.ratio-preview {
  background: var(--border-color);
  border-radius: 3px;
  transition: var(--transition);
}

.ratio-card.active .ratio-preview {
  background: var(--primary);
}

.ratio-portrait {
  width: 27px;
  height: 48px;
}

.ratio-landscape {
  width: 48px;
  height: 27px;
}

.ratio-square {
  width: 36px;
  height: 36px;
}

.ratio-four-three {
  width: 48px;
  height: 36px;
}

.ratio-three-four {
  width: 36px;
  height: 48px;
}

.ratio-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.ratio-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.ratio-sub {
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

.ratio-card.active .ratio-name {
  color: var(--primary);
}

@media (max-width: 600px) {
  .ratio-selector {
    gap: 6px;
  }
  
  .ratio-card {
    min-width: 55px;
    padding: 10px 6px;
  }
  
  .ratio-portrait {
    width: 20px;
    height: 36px;
  }
  
  .ratio-landscape {
    width: 36px;
    height: 20px;
  }
  
  .ratio-square {
    width: 28px;
    height: 28px;
  }
  
  .ratio-four-three {
    width: 36px;
    height: 27px;
  }
  
  .ratio-three-four {
    width: 27px;
    height: 36px;
  }
  
  .ratio-name {
    font-size: 0.75rem;
  }
  
  .ratio-sub {
    font-size: 0.65rem;
  }
}

/* 生成进度组件 */
.generation-progress {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  gap: 24px;
  min-height: 400px;
}

.skeleton-image {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 25%,
    var(--hover-bg) 50%,
    var(--bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.skeleton-image.skeleton-portrait {
  width: 225px;
  height: 400px;
}

.skeleton-image.skeleton-landscape {
  width: 400px;
  height: 225px;
}

.skeleton-image.skeleton-square {
  width: 320px;
  height: 320px;
}

.skeleton-image.skeleton-four-three {
  width: 400px;
  height: 300px;
}

.skeleton-image.skeleton-three-four {
  width: 300px;
  height: 400px;
}

.skeleton-image::after {
  content: '🎨';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 3rem;
  opacity: 0.3;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.6; transform: translate(-50%, -50%) scale(1.1); }
}

.progress-container {
  width: 100%;
  max-width: 300px;
}

.progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: 4px;
  transition: width 0.3s ease;
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: progressShine 1.5s infinite;
}

@keyframes progressShine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  font-size: 0.9rem;
}

.progress-stage {
  color: var(--text-secondary);
}

.progress-percent {
  color: var(--primary);
  font-weight: 600;
  font-size: 1rem;
}

.video-ratio-selector {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.video-ratio-card {
  flex: 1;
  min-width: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 12px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.video-ratio-card:hover {
  border-color: var(--primary-light);
  background: var(--hover-bg);
}

.video-ratio-card.active {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.video-ratio-card .ratio-preview {
  background: var(--border-color);
  border-radius: 3px;
  transition: var(--transition);
}

.video-ratio-card.active .ratio-preview {
  background: var(--primary);
}

.video-ratio-card .ratio-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.video-ratio-card.active .ratio-name {
  color: var(--primary);
}

.result-video {
  max-width: 100%;
  max-height: 500px;
  border-radius: var(--radius);
}

.frame-upload-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 600px) {
  .frame-upload-container {
    grid-template-columns: 1fr;
  }
}

.frame-upload-zone {
  position: relative;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-secondary);
  min-height: 150px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.frame-upload-zone:hover,
.frame-upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
}

.frame-upload-zone .upload-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.frame-upload-zone .frame-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.frame-upload-zone .frame-hint {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.frame-preview {
  max-width: 100%;
  max-height: 200px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.skeleton-video-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 3rem;
  opacity: 0.3;
  animation: pulse 2s ease-in-out infinite;
}

.history-item-video .history-video-thumb {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
}

.history-item-video .video-icon {
  font-size: 2.5rem;
  opacity: 0.8;
}

.history-item-video:hover .video-icon {
  transform: scale(1.1);
  transition: transform 0.2s ease;
}

/* ========================================
   移动端适配 - 480px 及以下
   ======================================== */

@media (max-width: 480px) {
  .app-container {
    padding: 0 12px;
  }

  .header {
    padding: 12px 0;
    margin-bottom: 16px;
    gap: 8px;
  }

  .logo {
    font-size: 1rem;
  }

  .header-right {
    gap: 6px;
  }

  .header-right .btn-secondary {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .header-right .btn-secondary span {
    display: none;
  }

  .header-right .btn-secondary::before {
    content: '⚙️';
  }

  .btn-icon {
    padding: 6px;
    font-size: 1rem;
  }

  .tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    flex-wrap: nowrap;
    gap: 4px;
    padding: 4px;
    margin-bottom: 16px;
  }

  .tabs::-webkit-scrollbar {
    display: none;
  }

  .tab-btn {
    flex: 0 0 auto;
    padding: 8px 12px;
    font-size: 0.8rem;
    white-space: nowrap;
  }

  .content-wrapper {
    gap: 12px;
    margin-bottom: 20px;
  }

  .input-panel,
  .result-panel {
    padding: 12px;
    border-radius: var(--radius);
  }

  .form-group {
    margin-bottom: 14px;
  }

  .form-group label {
    font-size: 0.9rem;
    margin-bottom: 6px;
  }

  .prompt-input,
  .input {
    padding: 10px 12px;
    font-size: 0.9rem;
  }

  .template-tags {
    gap: 6px;
  }

  .template-tag {
    padding: 5px 10px;
    font-size: 0.75rem;
  }

  .upload-zone {
    padding: 24px 12px;
  }

  .upload-icon {
    font-size: 1.5rem;
  }

  .upload-placeholder p {
    font-size: 0.85rem;
  }

  .upload-hint {
    font-size: 0.7rem;
  }

  .upload-preview {
    max-height: 200px;
  }

  .ratio-selector {
    gap: 4px;
  }

  .ratio-card {
    min-width: 50px;
    padding: 8px 4px;
    gap: 4px;
  }

  .ratio-preview-wrapper {
    height: 36px;
  }

  .ratio-portrait {
    width: 16px;
    height: 28px;
  }

  .ratio-landscape {
    width: 28px;
    height: 16px;
  }

  .ratio-square {
    width: 22px;
    height: 22px;
  }

  .ratio-four-three {
    width: 28px;
    height: 21px;
  }

  .ratio-three-four {
    width: 21px;
    height: 28px;
  }

  .ratio-name {
    font-size: 0.65rem;
  }

  .ratio-sub {
    font-size: 0.55rem;
  }

  .video-ratio-selector {
    gap: 8px;
  }

  .video-ratio-card {
    min-width: 90px;
    padding: 12px 8px;
  }

  .video-ratio-card .ratio-name {
    font-size: 0.8rem;
  }

  .frame-upload-zone {
    padding: 16px 12px;
    min-height: 120px;
  }

  .frame-upload-zone .upload-icon {
    font-size: 1.5rem;
    margin-bottom: 4px;
  }

  .frame-label {
    font-size: 0.85rem;
  }

  .frame-hint {
    font-size: 0.7rem;
  }

  .frame-preview {
    max-height: 150px;
  }

  .result-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .result-header h3 {
    font-size: 1rem;
  }

  .result-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .result-actions .btn {
    flex: 1;
    min-width: 80px;
    padding: 8px 10px;
    font-size: 0.75rem;
  }

  .result-content {
    min-height: 200px;
  }

  .placeholder-icon {
    font-size: 2.5rem;
  }

  .result-placeholder p {
    font-size: 0.85rem;
  }

  .result-image {
    max-height: 300px;
  }

  .result-video {
    max-height: 300px;
  }

  .result-info {
    padding: 10px;
    margin-top: 12px;
  }

  .info-item {
    font-size: 0.8rem;
    flex-direction: column;
    gap: 2px;
  }

  .generation-progress {
    padding: 20px 12px;
    min-height: 250px;
    gap: 16px;
  }

  .skeleton-image.skeleton-portrait {
    width: 140px;
    height: 250px;
  }

  .skeleton-image.skeleton-landscape {
    width: 250px;
    height: 140px;
  }

  .skeleton-image.skeleton-square {
    width: 200px;
    height: 200px;
  }

  .skeleton-image.skeleton-four-three {
    width: 240px;
    height: 180px;
  }

  .skeleton-image.skeleton-three-four {
    width: 180px;
    height: 240px;
  }

  .skeleton-image::after {
    font-size: 2rem;
  }

  .skeleton-video-icon {
    font-size: 2rem;
  }

  .progress-container {
    max-width: 220px;
  }

  .progress-info {
    font-size: 0.8rem;
  }

  .btn-large {
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  .history-section {
    margin-bottom: 24px;
  }

  .history-header {
    margin-bottom: 12px;
  }

  .history-header h3 {
    font-size: 1rem;
  }

  .history-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 8px;
  }

  .history-empty {
    padding: 24px;
  }

  .history-item-overlay {
    opacity: 1;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.4) 50%, transparent 100%);
    padding: 8px;
  }

  .history-item-actions {
    gap: 4px;
  }

  .history-item-actions button {
    padding: 5px;
    font-size: 0.65rem;
  }

  .history-item-delete {
    opacity: 1;
    width: 20px;
    height: 20px;
    font-size: 0.7rem;
  }

  .modal {
    padding: 12px;
  }

  .modal-content {
    padding: 16px;
    border-radius: var(--radius);
  }

  .modal-header {
    margin-bottom: 14px;
  }

  .modal-header h3 {
    font-size: 1rem;
  }

  .modal-close {
    width: 28px;
    height: 28px;
    font-size: 0.9rem;
  }

  .modal-footer {
    margin-top: 16px;
  }

  .modal-large {
    max-width: 100%;
    max-height: 95vh;
    padding: 12px;
  }

  .modal-image {
    max-height: 50vh;
    border-radius: var(--radius-sm);
  }

  .modal-image-actions {
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
    width: 100%;
  }

  .modal-image-actions .btn {
    flex: 1;
    min-width: 80px;
    padding: 10px 12px;
    font-size: 0.8rem;
  }

  .toast-container {
    bottom: 12px;
    right: 12px;
    left: 12px;
  }

  .toast {
    padding: 12px 14px;
    max-width: 100%;
    font-size: 0.85rem;
  }

  #modelVersionSelect {
    padding: 10px 12px;
    font-size: 0.9rem;
  }
}

/* ========================================
   超小屏幕适配 - 360px 及以下 (iPhone SE 等)
   ======================================== */

@media (max-width: 360px) {
  .app-container {
    padding: 0 8px;
  }

  .logo {
    font-size: 0.9rem;
  }

  .tab-btn {
    padding: 6px 10px;
    font-size: 0.75rem;
  }

  .ratio-card {
    min-width: 45px;
    padding: 6px 3px;
  }

  .ratio-name {
    font-size: 0.6rem;
  }

  .ratio-sub {
    display: none;
  }

  .video-ratio-card {
    min-width: 70px;
    padding: 10px 6px;
  }

  .video-ratio-card .ratio-name {
    font-size: 0.7rem;
  }

  .history-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }

  .history-item-actions button {
    font-size: 0.6rem;
    padding: 4px;
  }

  .result-actions .btn {
    font-size: 0.7rem;
    padding: 6px 8px;
  }

  .modal-image-actions .btn {
    font-size: 0.75rem;
    padding: 8px 10px;
  }
}

/* ========================================
   触摸设备优化 - 历史记录交互
   ======================================== */

@media (hover: none) and (pointer: coarse) {
  .history-item:hover {
    transform: none;
  }

  .history-item:active {
    transform: scale(0.98);
  }

  .history-item-overlay {
    opacity: 1;
  }

  .history-item-delete {
    opacity: 1;
  }

  .history-item.dragging {
    opacity: 0.6;
  }

  .btn:active {
    transform: scale(0.98);
  }

  .btn-primary:active {
    background: var(--primary-hover);
  }

  .ratio-card:active,
  .video-ratio-card:active {
    transform: scale(0.97);
  }

  .template-tag:active {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--primary);
  }
}

/* ========================================
   横屏模式优化
   ======================================== */

@media (max-height: 500px) and (orientation: landscape) {
  .modal-content {
    max-height: 95vh;
    padding: 12px;
  }

  .modal-image {
    max-height: 60vh;
  }

  .modal-image-actions {
    margin-top: 8px;
  }

  .generation-progress {
    min-height: 180px;
    padding: 12px;
    flex-direction: row;
    gap: 20px;
  }

  .skeleton-image.skeleton-portrait,
  .skeleton-image.skeleton-landscape,
  .skeleton-image.skeleton-square,
  .skeleton-image.skeleton-four-three,
  .skeleton-image.skeleton-three-four {
    max-height: 150px;
    width: auto;
  }

  .result-content {
    min-height: 150px;
  }
}

/* ========================================
   平滑滚动
   ======================================== */

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================
   桌面三栏布局 - 1200px 及以上
   ======================================== */

@media (min-width: 1200px) {
  .app-container {
    max-width: 100%;
    padding: 0 32px;
  }

  .desktop-layout {
    display: grid;
    grid-template-columns: 280px 1fr 280px;
    gap: 24px;
    min-height: calc(100vh - 120px);
  }

  .task-panel,
  .history-panel {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 16px;
    align-self: stretch;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    position: sticky;
    top: 20px;
  }

  .main-panel {
    min-width: 0;
  }

  .history-section {
    display: none;
  }
}

.task-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.task-panel-header h3 {
  font-size: 1rem;
  color: var(--text-primary);
  margin: 0;
}

.task-count {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-weight: 600;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.task-empty {
  text-align: center;
  padding: 24px 12px;
  color: var(--text-tertiary);
}

.task-empty p {
  margin: 0;
  font-size: 0.85rem;
}

.task-hint {
  font-size: 0.75rem;
  margin-top: 4px;
  opacity: 0.7;
}

.task-card {
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-secondary);
}

.task-card:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.task-card.active {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.task-card.running {
  border-left: 3px solid var(--primary);
  padding-left: 9px;
}

.task-card.completed {
  border-left: 3px solid var(--success);
  padding-left: 9px;
  opacity: 0.8;
}

.task-card.failed {
  border-left: 3px solid var(--error);
  padding-left: 9px;
}

.task-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.task-type {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 600;
  text-transform: uppercase;
}

.task-status {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.task-card.running .task-status {
  background: var(--primary);
  color: white;
}

.task-card.completed .task-status {
  background: var(--success);
  color: white;
}

.task-card.failed .task-status {
  background: var(--error);
  color: white;
}

.task-prompt {
  font-size: 0.8rem;
  color: var(--text-primary);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.task-progress {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
}

.task-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transition: width 0.3s ease;
  position: relative;
}

.task-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: progressShine 1.5s infinite;
}

.task-delete {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  font-size: 0.7rem;
  cursor: pointer;
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.task-card:hover .task-delete {
  opacity: 1;
}

.task-delete:hover {
  background: var(--error);
  color: white;
}

@media (max-width: 1024px) {
  .video-mode-selector {
    grid-template-columns: 1fr;
  }
}