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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --success-color: #10b981;
    --error-color: #ef4444;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    padding: 30px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.tab-button {
    flex: 1;
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.tab-button:hover {
    color: var(--primary-color);
    background: var(--bg-color);
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

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

/* Upload Area */
.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 12px;
    padding: 60px 30px;
    text-align: center;
    background: var(--bg-color);
    transition: all 0.3s;
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: #f3f4f6;
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: #eef2ff;
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.upload-area h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-success {
    background: var(--success-color);
    color: white;
    width: 100%;
    margin-top: 20px;
    padding: 16px;
    font-size: 1.1rem;
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* File List */
.file-list {
    margin-top: 20px;
    text-align: left;
}

.file-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 10px;
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-item .file-name {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
}

.file-item .file-size {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-left: 10px;
}

.file-item .remove-file {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--error-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.file-item .remove-file:hover {
    opacity: 1;
}

.file-item .remove-file:active {
    transform: translateY(-50%) scale(0.9);
}

/* Folder Input */
.folder-input-section {
    background: var(--bg-color);
    padding: 30px;
    border-radius: 12px;
}

.folder-input-section h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.folder-input-section p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.folder-input {
    flex: 1;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Courier New', monospace;
    transition: all 0.3s;
}

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

.path-hints {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.path-hints p {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.path-hints ul {
    list-style: none;
    padding-left: 0;
}

.path-hints li {
    padding: 8px 0;
    color: var(--text-secondary);
}

.path-hints code {
    background: var(--bg-color);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
}

/* Folder Selection Area */
.folder-selection-area {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 20px 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 15px;
    color: var(--text-secondary);
    font-weight: 500;
}

.server-path-section {
    padding: 20px;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.server-path-section h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.server-path-section p {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

/* Status Messages */
.status-message {
    margin-top: 20px;
    padding: 16px 20px;
    border-radius: 8px;
    font-weight: 500;
}

.status-message.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.status-message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #ef4444;
}

.status-message.info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #3b82f6;
}

/* Footer */
footer {
    background: var(--bg-color);
    padding: 20px 30px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    main {
        padding: 20px;
    }

    .upload-area {
        padding: 40px 20px;
    }

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

    .tabs {
        flex-direction: column;
    }

    .tab-button {
        text-align: center;
    }

    .input-group {
        flex-direction: column;
    }

    .folder-input {
        width: 100%;
    }
}

@media (max-width: 480px) {
    header {
        padding: 30px 20px;
    }

    header h1 {
        font-size: 1.75rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    main {
        padding: 15px;
    }

    .upload-area {
        padding: 30px 15px;
    }
}

/* Downloads Section */
.downloads-section {
    background: var(--bg-color);
    padding: 30px;
    border-radius: 12px;
}

.downloads-section h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.downloads-section p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.download-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.btn-secondary {
    background: #6b7280;
    color: white;
}

.btn-secondary:hover {
    background: #4b5563;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.photo-item {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.photo-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.photo-item.selected {
    border-color: var(--primary-color);
    background: #eef2ff;
}

.photo-checkbox {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 24px;
    height: 24px;
    cursor: pointer;
    accent-color: var(--primary-color);
    z-index: 10;
}

.photo-preview {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 10px;
    background: var(--bg-color);
}

.photo-info {
    text-align: center;
}

.photo-filename {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 5px;
    word-break: break-word;
}

.photo-size {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.download-actions {
    background: var(--card-bg);
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
}

.selected-count {
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.download-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-buttons .btn {
    flex: 1;
    min-width: 200px;
    padding: 14px 24px;
    font-size: 1rem;
}

.loading-message {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.no-photos-message {
    text-align: center;
    padding: 40px;
    background: var(--card-bg);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
}

.no-photos-message p {
    font-size: 1.1rem;
    margin: 0;
}

@media (max-width: 768px) {
    .photos-list {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 10px;
    }
    
    .download-controls {
        flex-direction: column;
    }
    
    .download-controls .btn {
        width: 100%;
    }
    
    .download-buttons {
        flex-direction: column;
    }
    
    .download-buttons .btn {
        width: 100%;
        min-width: unset;
    }
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-right: 10px;
    vertical-align: middle;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Custom Prompts Section */
.prompts-section {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    margin: 25px 0;
}

.prompts-section h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.prompts-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

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

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

.prompt-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.prompt-group small {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: all 0.3s;
}

.slider::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    transition: all 0.3s;
}

.slider::-moz-range-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.prompts-checkboxes {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-label span {
    color: var(--text-primary);
    font-weight: 500;
}

@media (max-width: 768px) {
    .prompts-grid {
        grid-template-columns: 1fr;
    }
    
    .prompts-section {
        padding: 20px;
    }
}