:root {
    --primary: #2563eb;
    --danger: #dc2626;
    --success: #16a34a;
    --dark: #1f2937;
    --light: #f9fafb;
}

* {
    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, var(--dark) 0%, #111827 100%);
    color: #e5e7eb;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--primary);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

header p {
    font-size: 1.1rem;
    color: #9ca3af;
}

main {
    display: grid;
    gap: 2rem;
}

.upload-section {
    background: rgba(31, 41, 55, 0.5);
    border: 2px dashed var(--primary);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.upload-section:hover {
    border-color: #60a5fa;
    background: rgba(37, 99, 235, 0.05);
}

.upload-area {
    padding: 2rem;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.upload-area h2 {
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #1d4ed8);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 1rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
}

.stats-section h2 {
    margin-bottom: 1.5rem;
    color: var(--primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(59, 130, 246, 0.05));
    border: 1px solid rgba(37, 99, 235, 0.3);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: #9ca3af;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
}

footer {
    text-align: center;
    padding: 2rem;
    color: #6b7280;
    border-top: 1px solid rgba(107, 114, 128, 0.2);
}

@media (max-width: 640px) {
    header h1 {
        font-size: 1.875rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}