header {
    position: sticky;
}

.contact-form {
    padding: 2rem 0;
    padding-top: 0;
}

.contact-form h2 {
    margin-top: 15px;
    margin-bottom: var(--margin-h2-sm);
    font-size: var(--font-size-h2-sm);
}

.contact-form .container {
    width: 90%;
    max-width: 600px;
    margin: 0 auto;
}

.form-title {
    text-align: center;
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 600;
    color: #333;
    font-size: 0.8rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.4rem;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 0.8rem;
    transition: border 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    outline: none;
}

.submit-btn {
    width: 100%;
    padding: 0.9rem;
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #302f2f;
}

@media (min-width: 768px) and (max-width: 1024.9px) {
    .contact-form h2 {
        margin-bottom: var(--margin-h2-md);
        font-size: var(--font-size-h2-md);
    }
}

/* PC */
@media (min-width: 1025px) {
    .contact-form h2 {
        margin-top: 18px;
        margin-bottom: var(--margin-h2-lg);
        font-size: var(--font-size-h2-lg);
    }
}