/* Shared structural layout primitives. */
.shell {
    width: min(1024px, 92vw);
    margin: 0 auto;
}

.site-header {
    background: color-mix(in srgb, var(--panel) 90%, var(--mix-anchor));
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(4px);
    position: relative;
    z-index: 100;
}

.nav {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.stack {
    display: grid;
    gap: 1.5rem;
    padding: 2rem 0;
}

.page h1 {
    margin-top: 0;
}

.site-footer {
    margin-top: auto;
    border-top: 1px solid var(--line);
    color: var(--muted);
    padding: 1.25rem 0;
    text-align: center;
}

.footer-note {
    margin: 0.45rem 0 0;
    line-height: 1.35;
    font-size: 0.82rem;
}

@media (max-width: 800px) {
    .nav {
        flex-direction: column;
        align-items: flex-start;
        padding: 0.9rem 0;
    }
}