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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #22d3ee;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #f43f5e;
    --success: #10b981;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #1a1f3a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.1);
    padding: 2rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.built-with {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid var(--primary-color);
    border-radius: 20px;
}

.built-with:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

main {
    padding: 3rem 0;
}

section {
    margin-bottom: 3rem;
}

.upload-area {
    background: var(--surface);
    border: 2px dashed var(--surface-light);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

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

.upload-area.dragover {
    border-color: var(--secondary-color);
    background: rgba(34, 211, 238, 0.05);
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
    stroke-width: 2;
}

.upload-content h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.upload-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.gallery-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.gallery-item.selected {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

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

.gallery-item .remove-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(244, 63, 94, 0.9);
    color: white;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.gallery-item:hover .remove-btn {
    display: flex;
}

.gallery-item .remove-btn:hover {
    background: var(--accent);
    transform: scale(1.1);
}

.control-panel {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
}

.image-selector {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
}

.arrow {
    font-size: 2rem;
    color: var(--primary-color);
    text-align: center;
}

.selector-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.selected-image {
    background: var(--surface-light);
    border: 2px dashed rgba(148, 163, 184, 0.3);
    border-radius: var(--border-radius);
    aspect-ratio: 1;
    position: relative;
    cursor: pointer;
    overflow: hidden;
    transition: var(--transition);
}

.selected-image:hover {
    border-color: var(--primary-color);
}

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

.selected-image .label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-secondary);
    text-align: center;
    pointer-events: none;
}

.selected-image img[src=""] + .label {
    display: block;
}

.selected-image img:not([src=""]) + .label {
    display: none;
}

.settings {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.slider-container input[type="range"] {
    width: 200px;
    height: 6px;
    background: var(--surface-light);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.slider-container input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.2);
}

.slider-container .value {
    min-width: 60px;
    text-align: right;
    color: var(--secondary-color);
    font-weight: 600;
}

.generate-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.generate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

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

.generate-btn .spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

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

.result-viewer {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
}

.result-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.control-btn {
    padding: 0.75rem 1.5rem;
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.control-btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.image-display {
    position: relative;
    background: var(--background);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.image-display img {
    width: 100%;
    height: 400px;
    object-fit: contain;
    display: block;
}

.progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(0, 0, 0, 0.5);
}

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

.timeline {
    background: var(--background);
    border-radius: 8px;
    padding: 1rem;
}

.timeline-track {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.5rem 0;
}

.timeline-item {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.timeline-item:hover {
    transform: scale(1.1);
    border-color: var(--secondary-color);
}

.timeline-item.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
}

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

footer {
    background: var(--surface);
    border-top: 1px solid rgba(148, 163, 184, 0.1);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .image-selector {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .arrow {
        transform: rotate(90deg);
    }
    
    .setting-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .slider-container {
        justify-content: space-between;
    }
    
    .slider-container input[type="range"] {
        flex: 1;
    }
    
    .result-controls {
        justify-content: center;
    }
    
    .timeline-track {
        justify-content: center;
    }
}