body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.card {
    border-radius: 10px;
    overflow: hidden;
}

.card-header {
    padding: 1.5rem;
}

h1, h2, h3 {
    color: #2c3e50;
}

h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
}

h3 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
}

.captcha-container {
    border: 1px solid #dee2e6;
}

.captcha-code {
    font-size: 1.5rem;
    font-weight: bold;
    letter-spacing: 5px;
    color: #1a5276;
    padding: 10px;
    background-color: #eaf2f8;
    border-radius: 5px;
}

.form-label {
    font-weight: 500;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .card-body {
        padding: 1rem;
    }
}