@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #d32f2f; /* Red from "Wang Kha Phatthana" colors maybe, or standard red */
    --secondary-color: #fbc02d; /* Yellow */
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --text-color: #333333;
}

body {
    font-family: 'Sarabun', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    background-image: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    min-height: 100vh;
}

.header-banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, #b71c1c 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
    border-bottom: 5px solid var(--secondary-color);
    margin-bottom: 2rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.school-logo {
    max-width: 120px;
    margin-bottom: 1rem;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.3));
}

.registration-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: none;
    margin-bottom: 3rem;
    overflow: hidden;
}

.card-header-custom {
    background-color: #f8f9fa;
    border-bottom: 2px solid var(--primary-color);
    padding: 1.5rem;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.card-body-custom {
    padding: 2.5rem;
}

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

.form-control, .form-select {
    border-radius: 8px;
    padding: 0.75rem 1rem;
    border: 1px solid #ced4da;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(211, 47, 47, 0.25);
}

.section-title {
    color: var(--primary-color);
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px dashed #ddd;
}

.btn-submit {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-submit:hover {
    background-color: white;
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(211, 47, 47, 0.3);
}

/* Custom Checkbox */
.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-label {
    font-weight: normal;
    cursor: pointer;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    color: #666;
    font-size: 0.9rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .card-body-custom {
        padding: 1.5rem;
    }
}