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

:root {
    --primary: #667eea;
    --primary-dark: #5a6fd6;
    --secondary: #a855f7;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg: #f7f9fb;
    --card: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text);
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--card);
    border-radius: 20px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.app-header {
    background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
    padding: 20px 30px;
    color: white;
}

.app-header h1 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.tab-nav {
    display: flex;
    gap: 10px;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.7);
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: rgba(255,255,255,0.2);
    color: white;
}

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

.tool-panel {
    display: none;
    padding: 30px;
}

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

.tool-header {
    text-align: center;
    margin-bottom: 25px;
}

.tool-header h2 {
    font-size: 1.5rem;
    color: var(--text);
    margin-bottom: 5px;
}

.tool-header p {
    color: var(--text-muted);
}

/* Drop Zone */
.drop-zone {
    border: 3px dashed var(--border);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--bg);
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--primary);
    background: #f0f4ff;
}

.drop-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 10px;
}

.drop-zone p {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 5px;
}

.drop-hint {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Images Container */
.images-container {
    margin-top: 20px;
    min-height: 120px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 15px;
    background: var(--bg);
    border-radius: 12px;
}

.empty-message {
    width: 100%;
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: 20px;
}

.image-card {
    position: relative;
    width: 120px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    cursor: grab;
    transition: transform 0.2s;
    background: white;
}

.image-card:hover {
    transform: scale(1.05);
}

.image-card.dragging {
    opacity: 0.5;
}

.image-card.drag-over-card {
    outline: 3px solid var(--primary);
}

.card-image {
    position: relative;
    width: 120px;
    height: 120px;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.order-badge {
    position: absolute;
    top: 5px;
    left: 5px;
    background: var(--primary);
    color: white;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
}

.card-actions {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 4px;
    padding: 6px;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    opacity: 0;
    transition: opacity 0.2s;
}

.image-card:hover .card-actions {
    opacity: 1;
}

.move-btn, .remove-btn {
    background: rgba(255,255,255,0.9);
    color: #333;
    border: none;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.75rem;
}

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

.card-filename {
    display: block;
    padding: 5px;
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    background: #f5f5f5;
}


/* Options */
.options {
    margin-top: 20px;
    padding: 15px;
    background: var(--bg);
    border-radius: 12px;
}

.option-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.option-label {
    font-size: 0.9rem;
    color: var(--text);
    font-weight: 500;
}

.options select {
    padding: 8px 12px;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    background: white;
}

.option {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 8px;
}

.option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* Watermark Options */
.watermark-section {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
}

.watermark-options {
    margin-top: 15px;
    padding: 15px;
    background: white;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.watermark-upload {
    padding: 15px;
    border: 2px dashed var(--border);
    border-radius: 8px;
    cursor: pointer;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.watermark-upload:hover {
    border-color: var(--primary);
}

.watermark-thumb {
    max-width: 60px;
    max-height: 60px;
    border-radius: 6px;
    margin-bottom: 10px;
}

.watermark-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.watermark-controls select {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.slider-group label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

.page-preview {
    position: relative;
    width: 100%;
    max-width: 150px;
    aspect-ratio: 8.5 / 11;
    background: white;
    border: 2px solid var(--border);
    border-radius: 4px;
    margin: 15px auto 0;
    overflow: hidden;
}

.preview-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60%;
    height: 40%;
    background: #e0e0e0;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 0.6rem;
}

.preview-watermark {
    position: absolute;
    max-width: 50%;
    max-height: 50%;
    display: none;
}

/* Actions */
.actions {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f1f1f1;
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: #e5e5e5;
}

.btn-sort {
    background: #f0f4ff;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.btn-accent {
    background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
    color: white;
}

/* Watermark Remover Specific */
.wm-results {
    margin-top: 20px;
}

.wm-progress {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--bg);
    border-radius: 10px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    width: 0%;
    transition: width 0.3s;
}

.wm-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.wm-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.wm-card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.wm-card.selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.wm-compare {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    cursor: pointer;
}

.wm-compare img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.wm-compare .wm-original {
    z-index: 1;
}

.wm-compare .wm-processed {
    z-index: 2;
    clip-path: inset(0 50% 0 0);
}

.wm-compare .compare-slider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background: white;
    z-index: 3;
    cursor: ew-resize;
    box-shadow: 0 0 5px rgba(0,0,0,0.3);
}

.wm-compare .compare-slider::after {
    content: '⟷';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 4px 8px;
    border-radius: 20px;
    font-size: 0.7rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.wm-card-info {
    padding: 12px;
}

.wm-card-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 5px;
}

.wm-card-status {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.75rem;
}

.wm-card-status.success {
    color: var(--success);
}

.wm-card-status.warning {
    color: var(--warning);
}

.wm-card-status.error {
    color: var(--danger);
}

.confidence-bar {
    flex: 1;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.confidence-fill {
    height: 100%;
    background: var(--success);
}

.wm-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

/* History */
.wm-history {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.wm-history h3 {
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 15px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 200px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: var(--bg);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.history-item:hover {
    background: #e5e7eb;
}

.history-thumb {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    object-fit: cover;
}

.history-info {
    flex: 1;
    min-width: 0;
}

.history-name {
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-date {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #333;
    color: white;
    padding: 14px 28px;
    border-radius: 10px;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 600px) {
    body { padding: 10px; }
    .app-header { padding: 15px; }
    .app-header h1 { font-size: 1.2rem; }
    .tab-btn { padding: 10px 15px; font-size: 0.85rem; }
    .tool-panel { padding: 20px; }
    .image-card, .card-image { width: 100px; height: 100px; }
    .actions { flex-direction: column; }
    .btn { width: 100%; }
}


/* Watermark card simple */
.wm-image {
    aspect-ratio: 1;
    overflow: hidden;
    background: #f5f5f5;
}

.wm-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.btn-download-single {
    width: 100%;
    padding: 8px;
    margin-top: 8px;
    border: none;
    background: var(--primary);
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background 0.2s;
}

.btn-download-single:hover {
    background: var(--primary-dark);
}

.wm-card.error .wm-card-info {
    color: var(--danger);
}

.error-text {
    font-size: 0.75rem;
    color: var(--danger);
}