.admin-shell {
    display: grid;
    min-height: 100vh;
    grid-template-columns: 260px minmax(0, 1fr);
    background: var(--st-bg);
}

.admin-sidebar {
    display: flex;
    flex-direction: column;
    gap: 28px;
    border-right: 1px solid var(--st-border);
    background: var(--st-surface);
    padding: 22px 16px;
}

.admin-main {
    min-width: 0;
}

.admin-header {
    display: flex;
    min-height: 72px;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    border-bottom: 1px solid var(--st-border);
    background: rgba(255, 255, 255, .88);
    padding: 0 28px;
}

.admin-header h1 {
    font-size: 1.05rem;
    line-height: 1.2;
}

.admin-content {
    padding: 32px 28px;
}

.admin-page-heading {
    max-width: 720px;
}

.admin-page-heading h2 {
    margin-top: 8px;
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    line-height: 1.1;
}

.admin-page-heading p:last-child {
    margin-top: 12px;
    color: var(--st-muted);
    font-size: 1rem;
}

@media (max-width: 820px) {
    .admin-shell {
        grid-template-columns: 1fr;
    }

    .admin-sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--st-border);
    }

    .admin-header {
        align-items: flex-start;
        flex-direction: column;
        padding: 18px 20px;
    }

    .admin-content {
        padding: 24px 20px;
    }
}