.seo-main {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    padding: 48px 0 72px;
}

.seo-hero {
    max-width: 900px;
    padding: 72px 0 64px;
}

.seo-hero h1 {
    max-width: 900px;
    margin: 12px 0 22px;
    font-size: clamp(2.6rem, 6vw, 5.4rem);
    line-height: 0.98;
    letter-spacing: -0.055em;
}

.seo-lead {
    max-width: 780px;
    font-size: clamp(1.08rem, 2vw, 1.28rem);
    line-height: 1.75;
    opacity: 0.86;
}

.seo-note {
    margin-top: 18px;
    font-size: 0.92rem;
    opacity: 0.66;
}

.seo-section,
.seo-faq {
    margin: 28px 0;
    padding: clamp(28px, 5vw, 54px);
    border: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.025);
}

.seo-section > h2,
.seo-faq > h2 {
    max-width: 800px;
    margin: 10px 0 20px;
    font-size: clamp(1.8rem, 4vw, 3rem);
    line-height: 1.08;
    letter-spacing: -0.035em;
}

.seo-section > p,
.seo-split > div > p,
.seo-faq details p {
    max-width: 820px;
    line-height: 1.8;
    opacity: 0.82;
}

.seo-card-grid,
.seo-topic-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 30px;
}

.seo-card,
.seo-topic-grid article {
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.025);
}

.seo-card-number {
    display: inline-block;
    margin-bottom: 24px;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    opacity: 0.55;
}

.seo-card h3,
.seo-topic-grid h3 {
    margin: 0 0 10px;
    font-size: 1.12rem;
}

.seo-card p,
.seo-topic-grid p {
    margin: 0;
    line-height: 1.65;
    opacity: 0.74;
}

.seo-split {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
    gap: 32px;
    align-items: start;
}

.seo-highlight {
    padding: 26px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.04);
}

.seo-highlight span {
    display: block;
    margin-bottom: 12px;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    opacity: 0.6;
}

.seo-highlight strong {
    display: block;
    margin-bottom: 14px;
    font-size: 1.25rem;
    line-height: 1.4;
}

.seo-highlight p {
    margin: 0;
    line-height: 1.7;
    opacity: 0.76;
}

.seo-faq details {
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.09);
}

.seo-faq summary {
    cursor: pointer;
    font-weight: 750;
    font-size: 1.05rem;
}

.seo-faq details p {
    margin: 14px 0 0;
}

.seo-final-cta {
    margin-top: 36px;
}

@media (max-width: 900px) {
    .seo-card-grid,
    .seo-topic-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .seo-split {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    .seo-main {
        width: min(100% - 24px, 1120px);
        padding-top: 20px;
    }

    .seo-hero {
        padding: 48px 0;
    }

    .seo-card-grid,
    .seo-topic-grid {
        grid-template-columns: 1fr;
    }

    .seo-section,
    .seo-faq {
        padding: 24px;
        border-radius: 18px;
    }
}