/* ── Layout ── */
.sub-page {
    display: grid;
    grid-template-columns: 1fr minmax(0, 640px);
    gap: 60px;
    align-items: start;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 40px;
}

/* ── Intro ── */
.sub-intro {
    position: sticky;
    top: 120px;
}

.sub-label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--navy);
    margin-bottom: 18px;
}

.sub-title {
    font-family: var(--serif);
    font-size: clamp(38px, 4.5vw, 60px);
    font-weight: 900;
    line-height: 1.05;
    color: var(--text);
    margin-bottom: 24px;
}

.sub-desc {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text);
    margin-bottom: 36px;
}

.sub-perks {
    display: flex;
    flex-direction: column;
    gap: 18px;
    border-left: 3px solid var(--navy);
    padding-left: 22px;
    margin-bottom: 40px;
}

.sub-perk strong {
    font-family: var(--serif);
    font-size: 18px;
    color: var(--navy);
}

.sub-perk p {
    font-size: 14px;
    color: var(--muted);
    margin-top: 2px;
}

.sub-cover {
    width: 220px;
    display: block;
    box-shadow: 0 20px 60px rgba(26,31,143,.2);
}

/* ── Form ── */
.sub-form-frame {
    background: #f0ede8;
    border: 1px solid #ddd8d2;
    border-top: 4px solid var(--navy);
}

.sub-form-frame iframe {
    display: block;
    width: 100%;
    height: 1400px;
    border: 0;
}

.sub-fallback {
    margin-top: 14px;
    font-size: 13px;
    color: var(--muted);
    text-align: center;
}

.sub-fallback a {
    color: var(--navy);
    font-weight: 600;
}

@media (max-width: 900px) {
    .sub-page {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 48px 16px;
    }

    .sub-intro {
        position: static;
    }

    .sub-cover {
        display: none;
    }

    .sub-form-frame iframe {
        height: 1700px;
    }
}