/* セクション（about, skills, works, contact）用CSS */
main {
    max-width: 900px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
}
section {
    margin-bottom: 2.8rem;
}
.section-title {
    font-size: 2rem;
    background: linear-gradient(to right, var(--color-sub), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
    border-left: 6px solid var(--color-sub);
    padding-left: 1rem;
    margin-bottom: 1.5rem;
}
@media (max-width: 700px) {
    .section-title {
        font-size: 1.3rem;
    }
}