body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.container {
    max-width: 800px;
}

.header {
    text-align: center;
    color: white;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.upload-card {
    background: white;
}

.card-title {
    font-weight: 600;
    color: #333;
    margin-bottom: 1.5rem;
}

.form-label {
    font-weight: 500;
    color: #555;
}

.btn {
    padding: 0.75rem 2rem;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-success {
    background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%);
    border: none;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(86, 171, 47, 0.4);
}

.progress {
    height: 25px;
    border-radius: 10px;
    background-color: #e9ecef;
}

.progress-bar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
}

#statusText {
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

.alert {
    border-radius: 10px;
    border: none;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.text-success {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
}

.form-check-input:checked {
    background-color: #667eea;
    border-color: #667eea;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .btn {
        width: 100%;
    }
}