.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(246, 241, 232, 0.93);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(29, 27, 25, 0.12);
}

.nav-shell {
    width: min(100% - 2rem, var(--max-width));
    margin-inline: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: 0.85rem 0;
}

.brand {
    text-decoration: none;
    font-family: "Fraunces", "Georgia", serif;
    font-size: 1.15rem;
    color: var(--deep-green-800);
}

.nav-toggle {
    border: 1px solid var(--deep-green-800);
    background: transparent;
    color: var(--deep-green-800);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.65rem;
    font-weight: 700;
}

.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: none;
    flex-direction: column;
    gap: 0.5rem;
    position: absolute;
    right: 1rem;
    top: calc(100% + 0.45rem);
    width: min(16rem, calc(100% - 2rem));
    background: var(--surface-1);
    border: 1px solid rgba(29, 27, 25, 0.1);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--space-3);
}

.nav-links.is-open {
    display: flex;
}

.nav-links a {
    text-decoration: none;
    color: var(--charcoal-ink);
    font-weight: 600;
    padding: 0.3rem 0.1rem;
    border-bottom: 2px solid transparent;
    transition: border-color 250ms var(--ease-artful), color 250ms var(--ease-artful);
}

.nav-links a[aria-current="true"] {
    color: var(--deep-green-800);
    border-color: var(--terracotta-500);
}

.nav-links a.sandbox-link {
    background: #4B2E2B;
    color: #f6f0e2;
    border: 1px solid #4B2E2B;
    border-bottom-color: #4B2E2B;
    border-radius: 999px;
    padding: 0.35rem 0.75rem;
}

.nav-links a.sandbox-link[aria-current="true"] {
    color: #f6f0e2;
    border-color: #4B2E2B;
}

.nav-links a.sandbox-link:hover {
    color: #f6f0e2;
    border-color: #3b2422;
    background: #3b2422;
}

.site-main {
    overflow: clip;
}

.site-footer {
    padding: var(--space-5) 0;
    background: var(--deep-green-800);
    color: var(--warm-ivory);
    margin-top: var(--space-6);
}

.site-footer p {
    margin: 0;
    text-align: center;
}

@media (min-width: 48rem) {
    .nav-toggle {
        display: none;
    }

    .nav-links {
        position: static;
        width: auto;
        padding: 0;
        box-shadow: none;
        border: 0;
        background: transparent;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: var(--space-3);
    }
}