.blu-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.blu-header,
.blu-footer {
    width: 100%;
    border-color: var(--blu-border);
    background: rgba(6, 17, 31, 0.72);
    backdrop-filter: blur(18px);
}

.blu-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid var(--blu-border);
}

.blu-footer {
    border-top: 1px solid var(--blu-border);
}

.blu-header-inner,
.blu-footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    width: min(var(--blu-container), calc(100% - 2rem));
    margin: 0 auto;
    padding: 1rem 0;
}

.blu-header-actions,
.blu-footer-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.blu-stage {
    display: grid;
    flex: 1;
    gap: clamp(1.5rem, 4vw, 3rem);
    width: min(var(--blu-container), calc(100% - 2rem));
    margin: 0 auto;
    padding: clamp(3rem, 8vw, 7rem) 0;
}

.blu-stage--center {
    place-items: center;
}

.blu-page-content {
    width: min(820px, 100%);
    margin: 0 auto;
}

@media (max-width: 760px) {
    .blu-header-inner,
    .blu-footer-inner,
    .blu-header-actions,
    .blu-footer-actions {
        align-items: flex-start;
        flex-direction: column;
    }

    .blu-stage {
        padding: 2rem 0;
    }
}