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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.model-info-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.info-header h2 {
    color: #333;
    margin-bottom: 30px;
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.metric-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 25px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
    transition: transform 0.3s ease;
}

.metric-box:hover {
    transform: translateY(-5px);
}

.metric-icon {
    font-size: 2.5rem;
}

.metric-content {
    flex: 1;
}

.metric-label {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    margin-bottom: 5px;
    font-weight: 500;
}

.metric-value {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
}

.dataset-section {
    border-top: 2px solid #f0f0f0;
    padding-top: 30px;
}

.dataset-section h3 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.4rem;
    font-weight: 600;
}

.dataset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.info-item {
    background: #f8f9ff;
    padding: 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 15px;
    border: 2px solid #e8e9ff;
    transition: all 0.3s ease;
}

.info-item:hover {
    border-color: #667eea;
    background: #f0f2ff;
    transform: translateX(5px);
}

.info-icon {
    font-size: 2rem;
}

.info-label {
    color: #666;
    font-size: 0.85rem;
    margin-bottom: 5px;
    font-weight: 500;
}

.info-value {
    color: #333;
    font-size: 1.1rem;
    font-weight: 700;
}

.upload-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    margin-bottom: 30px;
}

.upload-box {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.upload-box:hover {
    border-color: #764ba2;
    background: #f8f9ff;
}

.upload-box.dragover {
    border-color: #764ba2;
    background: #f0f0ff;
    transform: scale(1.02);
}

.upload-content svg {
    color: #667eea;
    margin-bottom: 20px;
}

.upload-content p {
    font-size: 1.2rem;
    color: #333;
    margin-bottom: 10px;
}

.upload-content span {
    color: #666;
    font-size: 0.9rem;
}

.btn-primary {
    width: 100%;
    padding: 15px;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

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

.results-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.image-comparison {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.image-box {
    flex: 1;
    min-width: 250px;
    text-align: center;
}

.image-box h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.image-box img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    image-rendering: pixelated;
}

.arrow {
    font-size: 3rem;
    color: #667eea;
    font-weight: bold;
}

.loading {
    text-align: center;
    padding: 40px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto 20px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading p {
    color: #333;
    font-size: 1.1rem;
}

.error {
    background: #ff4444;
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    font-weight: 500;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .arrow {
        transform: rotate(90deg);
    }
    
    .upload-section, .results-section {
        padding: 20px;
    }
}

/* ── Sample images section ─────────────────────────────────────── */
.samples-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.samples-section h2 {
    color: #333;
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
    text-align: center;
}

.samples-subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 24px;
    font-size: 1rem;
}

.samples-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

.samples-loading {
    color: #999;
    font-size: 1rem;
}

.sample-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 12px;
    border-radius: 12px;
    border: 2px solid #e8e9ff;
    background: #f8f9ff;
    transition: all 0.2s ease;
    width: 100px;
}

.sample-card:hover {
    border-color: #667eea;
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(102,126,234,0.25);
}

.sample-card.active {
    border-color: #764ba2;
    background: #f0eaff;
    box-shadow: 0 6px 16px rgba(118,75,162,0.3);
}

.sample-card img {
    width: 64px;
    height: 64px;
    image-rendering: pixelated;
    border-radius: 6px;
}

.sample-card span {
    font-size: 0.8rem;
    font-weight: 600;
    color: #555;
}

.upload-section h2,
.results-section h2 {
    color: #333;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}