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

.card {
    border: none;
    border-radius: 15px;
}

.card-body {
    border-radius: 15px;
}

.btn-primary {
    background-color: #667eea;
    border-color: #667eea;
    padding: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #5568d3;
    border-color: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    background-color: #9ca3af;
    border-color: #9ca3af;
    cursor: not-allowed;
    transform: none;
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.alert {
    border-radius: 10px;
}

h3 {
    color: #333;
    font-weight: 600;
}

h5 {
    font-weight: 400;
}