/* ============ GENERATION PREVIEW ============ */
.preview-area {
  margin-top: 24px;
}
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.preview-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.preview-card:hover {
  border-color: var(--border-hover);
}
.preview-card.streaming {
  border-color: var(--accent);
  animation: breathe 2s ease-in-out infinite;
}
.preview-card.pending {
  border-color: var(--warning);
}
.preview-card.generating {
  border-color: var(--accent);
  animation: breathe 2s ease-in-out infinite;
}
.preview-card.skeleton .preview-image-wrap {
  background: var(--bg-input);
}
.preview-card.skeleton .skeleton-shimmer {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.06) 50%, transparent 100%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
}
.preview-image-wrap {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--bg-input);
}
.preview-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.4s ease, filter 0.4s ease, transform 0.3s ease;
}
.preview-image-wrap img.loading {
  opacity: 0;
  filter: blur(10px);
}
.preview-image-wrap img.loaded {
  opacity: 1;
  filter: blur(0);
  animation: img-fade-in 0.5s ease-out;
}
.preview-image-wrap img:hover {
  transform: scale(1.03);
}

.preview-card-footer {
  padding: 10px 12px;
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.btn-download-plain {
  padding: 6px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 600;
}

.btn-download-plain:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.preview-meta {
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.preview-prompt {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

/* ============ HISTORY CARDS (Drawer) ============ */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.history-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
  animation: card-pop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  transition: border-color var(--transition);
}
.history-card:hover {
  border-color: var(--border-hover);
}
.history-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 8px;
}
.history-card-prompt {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}
.history-card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.history-card-images {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}
.history-card-images.single {
  grid-template-columns: 1fr;
}
.history-thumb {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-input);
}
.history-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.history-thumb:hover img {
  transform: scale(1.05);
}
.history-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}
.history-time {
  font-size: 11px;
  color: var(--text-muted);
}

/* Task badge */
.task-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.task-badge.running {
  background: rgba(108, 92, 231, 0.12);
  color: var(--accent-light);
}

.task-badge.running .badge-dot {
  background: var(--accent);
  animation: pulse-dot 1.5s ease-in-out infinite;
}

.task-badge.pending {
  background: rgba(253, 203, 110, 0.15);
  color: #f39c12;
}

.task-badge.pending .badge-dot {
  background: #f39c12;
  animation: pulse-dot 1.5s ease-in-out infinite;
}

.task-badge.recovering {
  background: rgba(0, 206, 201, 0.12);
  color: var(--secondary);
}

.task-badge.completed {
  background: rgba(0, 184, 148, 0.12);
  color: var(--success);
}

.task-badge.failed {
  background: rgba(225, 112, 85, 0.12);
  color: var(--danger);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}


/* ============ API DOC PAGE ============ */
.doc-hero {
  text-align: center;
  padding: 32px 0 24px;
  margin-bottom: 8px;
}

.doc-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent-light), var(--secondary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.doc-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}

.doc-section {
  margin-bottom: 28px;
}

.doc-section-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.doc-section-title::before {
  content: '';
  display: block;
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--secondary));
}

.param-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.param-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  background: var(--bg-card);
}

.param-table thead {
  background: rgba(108, 92, 231, 0.06);
}

.param-table th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

.param-table td {
  padding: 12px 16px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.param-table tbody tr:last-child td {
  border-bottom: none;
}

.param-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.param-table code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-input);
  color: var(--accent-light);
}

.param-table .badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
}

.param-table .badge.yes {
  background: rgba(0, 184, 148, 0.1);
  color: var(--success);
}

.param-table .badge.no {
  background: rgba(0,0,0,0.04);
  color: var(--text-muted);
}

.param-table .badge.points {
  background: rgba(253, 203, 110, 0.1);
  color: var(--warning);
}

.param-table .ratio-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.param-table .ratio-tag {
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(108, 92, 231, 0.08);
  color: var(--accent-light);
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
}

.doc-hint {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-muted);
  padding-left: 12px;
  border-left: 2px solid var(--border);
}

.doc-code {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 12px;
  overflow-x: auto;
  font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-primary);
}

.doc-code code {
  background: transparent;
  border: none;
  padding: 0;
  font-family: inherit;
  color: inherit;
}


/* ============ EMPTY STATE ============ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  color: var(--text-muted);
  text-align: center;
}
.empty-state p {
  font-size: 13px;
}

/* Navbar Auth */
.navbar-auth { display: flex; align-items: center; gap: 8px; }
.navbar-user { display: flex; align-items: center; gap: 10px; }
.nav-login { color: #4a90d9 !important; }
.nav-register { background: #4a90d9 !important; color: #fff !important; border-radius: 6px; }
.nav-register:hover { background: #357abd !important; }
.user-credits { display: inline-flex; align-items: center; gap: 8px; background: #fff; border: 1px solid #e2e8f0; padding: 5px 6px 5px 14px; border-radius: 20px; font-size: 13px; font-weight: 500; white-space: nowrap; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }
.user-credits .nc-credits { color: #0f172a; font-weight: 700; }
.user-credits .nc-plan { display: inline-flex; align-items: center; gap: 4px; background: linear-gradient(135deg, #6366f1, #4f46e5); color: #fff; padding: 3px 10px; border-radius: 14px; font-size: 12px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 120px; }
.user-credits .nc-plan small { font-weight: 500; opacity: 0.85; }
.user-credits .nc-plan.warning { background: linear-gradient(135deg, #f59e0b, #d97706); }
.user-credits .nc-plan.urgent { background: linear-gradient(135deg, #ef4444, #dc2626); }
.user-name { color: #333; font-size: 14px; }

/* Recharge dropdown */
.user-credits { position: relative; cursor: pointer; }
.recharge-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 16px;
  width: 240px;
  z-index: 200;
  animation: fade-in 0.2s ease;
}
.recharge-dropdown-header {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.recharge-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.recharge-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-family: inherit;
}
.recharge-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
}
.recharge-cost {
  font-size: 18px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 12px;
}
.recharge-paytypes {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
.recharge-paytypes label {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.recharge-paytypes input[type="radio"] {
  cursor: pointer;
}

/* ============ WORKSPACE SPLIT ============ */
.workspace-split {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 900px) {
  .workspace-split {
    grid-template-columns: 1fr;
  }
}

/* ============ CONFIG PANEL (Left) ============ */
.config-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 80px;
}

@media (max-width: 900px) {
  .config-panel {
    position: static;
  }
}

.config-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.config-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.config-label-icon {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

.prompt-section .prompt-input {
  min-height: 100px;
  padding: 12px;
  border: none;
  background: transparent;
  resize: vertical;
}

/* Prompt composer: textarea + toolbar fused */
.prompt-composer {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.prompt-composer.dragover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.prompt-composer:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.prompt-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  min-height: 40px;
}
.prompt-image-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
}
.prompt-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  flex-shrink: 0;
}
.prompt-upload-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}
.prompt-upload-btn svg {
  width: 16px;
  height: 16px;
}

.config-select-wrap {
  position: relative;
}

.config-select {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition);
}

.config-select:hover {
  border-color: var(--border-hover);
}

.config-select.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.config-picker-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 20;
  max-height: 240px;
  overflow-y: auto;
}

/* Ratio grid */
.ratio-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.ratio-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 2px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-input);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.ratio-btn:hover:not(.disabled) {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.ratio-btn.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  box-shadow: 0 0 0 1px var(--accent-glow);
}

.ratio-btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.ratio-box-wrap {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ratio-box {
  background: linear-gradient(135deg, var(--text-muted), rgba(148,163,184,0.6));
  border-radius: 3px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.2);
  transition: all 0.2s ease;
}

.ratio-btn.active .ratio-box {
  background: linear-gradient(135deg, var(--accent), var(--accent-light, #818cf8));
  box-shadow: 0 3px 10px rgba(99,102,241,0.3), 0 1px 3px rgba(99,102,241,0.2), inset 0 1px 0 rgba(255,255,255,0.3);
}

.ratio-box.ratio-auto {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  color: #fff;
  box-shadow: 0 2px 8px rgba(245,158,11,0.35), inset 0 1px 0 rgba(255,255,255,0.3);
}
.ratio-btn.active .ratio-box.ratio-auto {
  background: linear-gradient(135deg, var(--accent), var(--accent-light, #818cf8));
  box-shadow: 0 3px 10px rgba(99,102,241,0.3), inset 0 1px 0 rgba(255,255,255,0.3);
}
.ratio-auto-icon {
  width: 16px;
  height: 16px;
}

.ratio-text {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 600;
}

.ratio-btn.active .ratio-text {
  color: var(--accent);
}

/* Count row */
.count-row {
  display: flex;
  gap: 8px;
}

.count-btn {
  flex: 1;
  padding: 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 600;
}

.count-btn:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.count-btn.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent);
}

/* Quality row */
.quality-row {
  display: flex;
  gap: 8px;
}

.quality-row .qbtn {
  flex: 1;
  padding: 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 600;
}

.quality-row .qbtn:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.quality-row .qbtn.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent);
}

/* ============ OUTPUT PANEL (Right) ============ */
.output-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  min-height: 560px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: relative;
  --progress: 0%;
}

/* Border progress ring */
.output-panel.generating::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--radius-lg) + 2px);
  background: conic-gradient(var(--accent) var(--progress), transparent var(--progress));
  z-index: 10;
  pointer-events: none;
  padding: 2px;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
  position: relative;
  z-index: 5;
  background: var(--bg-card);
}

.output-header-left,
.output-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.output-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.output-body {
  flex: 1;
  overflow: auto;
  padding: 20px;
  background: #f8fafc;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 5;
}

.output-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 5;
  background: var(--bg-card);
}

.output-footer .progress-bar {
  flex: 1;
  height: 6px;
  margin-left: 0;
}

/* ============ OUTPUT EMPTY STATE ============ */
.output-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  color: var(--text-muted);
  text-align: center;
  place-self: center;
}

.empty-art {
  margin-bottom: 20px;
}

.empty-art-svg {
  width: 180px;
  height: 144px;
  color: var(--text-muted);
}

.empty-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.empty-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.empty-hints {
  display: flex;
  align-items: center;
  gap: 8px;
}

.empty-hint {
  font-size: 12px;
  color: var(--text-muted);
}

.empty-hint-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border-hover);
}

/* ============ GENERATING STATE ============ */
.generating-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-align: center;
  gap: 8px;
  padding: 48px 24px;
  animation: fade-in 0.3s ease;
}

.generating-state.active {
  display: flex;
}

.generating-art-svg {
  width: 180px;
  height: 144px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.generating-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.generating-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.generating-percent {
  font-size: 52px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -1px;
  margin-top: 8px;
  transition: all 0.2s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ PREVIEW IN OUTPUT PANEL ============ */
.output-body .preview-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  flex: 1;
  min-height: 0;
  align-content: flex-start;
}

/* When grid only has empty state, center it vertically and horizontally */
.preview-grid:has(> .output-empty:only-child) {
  align-items: center;
  align-content: center;
}

.output-body .preview-card {
  background: var(--bg-card);
  border-color: var(--border);
  width: 280px;
  flex-shrink: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.output-body .preview-image-wrap {
  width: 100%;
  background: var(--bg-input);
  position: relative;
  overflow: hidden;
}

.output-body .preview-image-wrap img.loading {
  opacity: 0;
  filter: blur(10px);
  transform: scale(0.96);
}

.output-body .preview-image-wrap img.loaded {
  opacity: 1;
  filter: blur(0);
  transform: scale(1);
  animation: img-reveal 0.5s ease-out;
}

@keyframes img-reveal {
  from { opacity: 0; transform: scale(0.96); filter: blur(4px); }
  to { opacity: 1; transform: scale(1); filter: blur(0); }
}

.output-body .preview-card.skeleton .preview-image-wrap {
  background: var(--bg-input);
}

.output-body .preview-card.skeleton .skeleton-shimmer {
  background: linear-gradient(90deg, transparent 0%, rgba(0,0,0,0.04) 50%, transparent 100%);
  background-size: 200% 100%;
}