/* PDF Merger Light Theme */

/* Upload Card */

/* Dark mode overrides */
[data-theme="dark"] {
    --tool-bg: #0f172a;
    --tool-border: #334155;
    --tool-border-hover: #475569;
    --tool-text: #f8fafc;
    --tool-text-secondary: #94a3b8;
    --tool-input-bg: #1e293b;
    --tool-input-border: #334155;
    --tool-button-bg: #1e293b;
    --tool-button-hover: #334155;
    --tool-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --tool-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --background-color: #0f172a;
    --text-color: #f8fafc;
    --status-info: rgba(96, 165, 250, 0.2);
    --status-success: rgba(34, 197, 94, 0.2);
    --status-error: rgba(248, 113, 113, 0.2);
    --bg-color: #0f172a;
}

/* Dark mode element overrides */
[data-theme="dark"] .tool-card {
    background: var(--bg-card, #1e293b);
    border-color: var(--border-color, #334155);
}

[data-theme="dark"] .tool-hero {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: var(--input-bg, #1e293b);
    color: var(--text-primary, #f8fafc);
    border-color: var(--border-color, #334155);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
    color: var(--text-muted, #64748b);
}

[data-theme="dark"] .tab-btn.active {
    color: white;
}

[data-theme="dark"] label {
    color: var(--text-primary, #f8fafc);
}

[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3,
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 {
    color: var(--text-primary, #f8fafc);
}

[data-theme="dark"] p {
    color: var(--text-secondary, #cbd5e1);
}
.upload-card {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 24px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--bg-secondary);
}

.card-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

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

.action-btn {
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.1rem;
}

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

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-color, #e1e5e9);
    border-radius: 12px;
    padding: 48px 24px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--bg-secondary);
}

.upload-zone:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
}

.upload-zone.drag-over {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
    transform: scale(1.02);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.upload-icon {
    font-size: 3rem;
    opacity: 0.7;
}

.upload-content h4 {
    color: var(--text-primary);
    margin: 0;
    font-size: 1.3rem;
    font-weight: 600;
}

.upload-content p {
    color: var(--text-muted);
    margin: 0;
    font-size: 1rem;
}

.browse-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.browse-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.3);
}

/* File Requirements */
.file-requirements {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color, #e1e5e9);
}

.requirement-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);`n    font-size: 0.9rem;
}

.req-icon {
    font-size: 1rem;
}

/* Files Card */
.files-card {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 24px;
}

.files-card.hidden,
#filesCard {
    display: none !important;
}

.files-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.file-count {
    color: var(--text-muted);`n    font-size: 0.9rem;
}

.merge-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, #28a745 0%, #1e7e34 100%);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.merge-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.3);
}

.merge-btn:disabled {
    background: #6c757d;
    cursor: not-allowed;
    opacity: 0.6;
}

/* Files List */
.files-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
    cursor: grab;
}

.file-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
}

.file-item.dragging {
    opacity: 0.5;
    transform: rotate(2deg);
}

.file-item.drag-over {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
}

.file-item.file-error {
    border-color: #dc3545;
    background: rgba(220, 53, 69, 0.05);
}

.file-drag-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    color: #999;
    cursor: grab;
}

.file-drag-handle:active {
    cursor: grabbing;
}

.drag-icon {
    font-size: 1.2rem;
    line-height: 1;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.file-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.file-details {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);`n    font-size: 0.95rem;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    var(--bg-primary)-space: nowrap;
}

.file-meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);`n}

.file-pages.error {
    color: #dc3545;
}

.file-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.file-action-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.file-action-btn:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.file-action-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.file-action-btn.remove {
    color: #dc3545;
}

.file-action-btn.remove:hover {
    background: rgba(220, 53, 69, 0.1);
    border-color: #dc3545;
}

/* Merge Options */
.merge-options {
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

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

.filename-input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    background: var(--bg-primary);
    color: var(--text-primary);`n}

.filename-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.1);
}

/* Progress Card */
.progress-card {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 24px;
}

.progress-card.hidden {
    display: none !important;
}

.progress-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-text {
    color: var(--text-primary);`n    font-weight: 500;
}

.progress-percent {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #007bff, #0056b3);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-details {
    text-align: center;
}

.current-file {
    color: var(--text-muted);`n    font-size: 0.9rem;
    font-style: italic;
}

/* Results Card */
.results-card {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 24px;
}

.results-card.hidden {
    display: none !important;
}

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

.results-content {
    text-align: center;
}

.success-state {
    padding: 24px;
}

.success-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    color: var(--text-success);
}

.success-state h4 {
    color: var(--text-primary);`n    margin-bottom: 8px;
    font-size: 1.5rem;
}

.merge-summary {
    color: var(--text-muted);`n    margin-bottom: 32px;
    font-size: 1rem;
    line-height: 1.5;
}

.download-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.download-btn {
    padding: 16px 32px;
    background: linear-gradient(135deg, #28a745 0%, #1e7e34 100%);
    color: var(--bg-primary);
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.3);
}

.file-info {
    display: flex;
    gap: 24px;
    justify-content: center;
    color: var(--text-muted);`n    font-size: 0.9rem;
}

/* Error Toast */
.error-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-primary);
    border: 1px solid #dc3545;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    max-width: 400px;
    animation: slideIn 0.3s ease;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
}

.toast-icon {
    color: #dc3545;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.toast-message {
    color: var(--text-primary);`n    font-size: 0.9rem;
    line-height: 1.4;
    flex: 1;
}

.toast-close {
    background: none;
    border: none;
    color: #999;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast-close:hover {
    color: var(--text-muted);`n}

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

/* Step List */
.step-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.step-number {
    width: 32px;
    height: 32px;
    background: #007bff;
    color: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.step-content h4 {
    color: var(--text-primary);`n    margin-bottom: 4px;
    font-size: 1rem;
}

.step-content p {
    color: var(--text-muted);`n    font-size: 0.9rem;
    line-height: 1.4;
    margin: 0;
}

/* Feature List */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.feature-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.feature-content h4 {
    color: var(--text-primary);`n    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.feature-content p {
    color: var(--text-muted);`n    font-size: 0.85rem;
    line-height: 1.4;
    margin: 0;
}

/* Tips List */
.tips-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tip-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.tip-item span:last-child {
    color: var(--text-secondary);`n    font-size: 0.9rem;
    line-height: 1.4;
}

/* Use Cases */
.use-cases {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.use-case {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.case-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.use-case span:last-child {
    color: var(--text-secondary);`n    font-size: 0.9rem;
}

/* Info Cards */
.info-card {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 24px;
}

.info-card h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .upload-actions,
    .files-actions,
    .results-actions {
        align-self: flex-end;
    }
    
    .file-meta {
        flex-direction: column;
        gap: 4px;
    }
    
    .file-actions {
        flex-direction: column;
    }
    
    .file-info {
        flex-wrap: wrap;
    }
    
    .requirement-item {
        font-size: 0.8rem;
    }
    
    .file-info {
        gap: 8px;
    }
    
    .error-toast {
        right: 10px;
        left: 10px;
        max-width: none;
    }
}