html[lang="ja"] body {
    font-family: 'Noto Sans JP', 'Instrument Sans', system-ui, sans-serif;
}
html[lang="ja"] .hero-content h1 {
    font-size: clamp(1.6rem, 1rem + 2.5vw, 2.2rem);
    max-width: none;
    white-space: nowrap;
    line-height: 1.4;
}
html[lang="ja"] .hero .subtitle {
    font-size: 1.05rem;
    letter-spacing: 0.05em;
    font-weight: 500;
}
@media (min-width: 992px) {
    html[lang="ja"] .hero-content h1 {
        font-size: clamp(2.85rem, 1rem + 2vw, 3.15rem);
    }
    html[lang="ja"] .hero .subtitle {
        font-size: 1.575rem;
        letter-spacing: 0.25em;
    }
}
@media (max-width: 480px) {
    html[lang="ja"] .feature-card p {
        font-size: 0.90rem;
    }
    html[lang="ja"] .profile-desc {
        font-size: 1.0rem;
        letter-spacing: -0.02em;
        line-height: 1.6;
    }
    html[lang="ja"] .hero-content h1 {
        font-size: 1.85rem;
    }
    html[lang="ja"] .form-check-label {
        letter-spacing: -0.012em;
    }
}
html[lang="ja"] .metric-item h4 {
    font-size: 0.95rem;
}
html[lang="ja"] .metric-item li {
    font-size: 0.925rem;
}