@media (max-width: 72rem) {
    .content-grid--four {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .primary-navigation a {
        padding-inline: 0.4rem;
        font-size: 0.8rem;
    }

    .person-card {
        flex-direction: column;
    }

    .boundary-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .metric-grid,
    .metric-grid--five {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .directory-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .directory-grid--leadership {
        grid-template-columns: minmax(0, 19rem);
    }
}

@media (max-width: 59.9375rem) {
    :root {
        --header-height: 4.25rem;
    }

    .nav-toggle {
        display: block;
        flex: 0 0 auto;
    }

    .primary-navigation {
        position: absolute;
        top: calc(100% + var(--space-2));
        right: 0;
        left: 0;
        max-height: 0;
        overflow: hidden;
        border: 1px solid transparent;
        border-radius: var(--radius-lg);
        background: var(--color-surface);
        box-shadow: var(--shadow-sm);
        opacity: 0;
        pointer-events: none;
        transform: translateY(-0.5rem);
        transition: max-height var(--transition-base), opacity var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
    }

    .primary-navigation[data-open="true"] {
        max-height: calc(100vh - var(--header-height) - var(--space-6));
        overflow-y: auto;
        border-color: var(--color-border);
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .primary-navigation ul {
        display: grid;
        gap: var(--space-1);
        padding: var(--space-3);
    }

    .primary-navigation a {
        width: 100%;
        min-height: 2.9rem;
        padding-inline: var(--space-4);
        font-size: var(--font-size-sm);
    }

    body.nav-open {
        overflow: hidden;
    }

    .hero__grid {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .hero h1 {
        max-width: 15ch;
    }

    .hero-visual {
        width: min(100%, 40rem);
    }

    .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .content-grid--three {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .about-layout {
        grid-template-columns: 1fr;
    }

    .about-layout .section-header {
        margin-bottom: clamp(2rem, 4vw, 3.25rem);
    }

    .person-grid,
    .potential-grid,
    .facility-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .person-grid .person-card:last-child,
    .potential-grid .potential-card:last-child {
        grid-column: 1 / -1;
    }

    .cta-panel {
        grid-template-columns: 1fr;
    }

    .cta-panel__actions {
        justify-content: flex-start;
    }

    .definition-grid,
    .definition-grid--three,
    .data-group-grid,
    .potential-feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .data-group-grid .data-group:last-child,
    .potential-feature-grid .potential-feature-card:last-child {
        grid-column: 1 / -1;
    }

    .land-layout,
    .security-layout,
    .potential-proportion-layout {
        grid-template-columns: 1fr;
    }

    .security-layout .section-header {
        margin-bottom: clamp(2rem, 4vw, 3.25rem);
    }

    .metric-grid--four {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .directory-grid,
    .leadership-grid,
    .member-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .directory-grid--leadership {
        grid-template-columns: minmax(0, 19rem);
    }

    .publication-grid,
    .gallery-card-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .contact-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .contact-grid article:last-child {
        grid-column: 1 / -1;
    }
}

@media (max-width: 47.9375rem) {
    .content-grid--three,
    .content-grid--four {
        grid-template-columns: 1fr;
    }

    .person-grid,
    .potential-grid,
    .facility-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .chart-grid,
    .definition-grid,
    .definition-grid--three,
    .data-group-grid,
    .potential-feature-grid {
        grid-template-columns: 1fr;
    }

    .data-group-grid .data-group:last-child,
    .potential-feature-grid .potential-feature-card:last-child {
        grid-column: auto;
    }

    .metric-grid,
    .metric-grid--four,
    .metric-grid--five {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .history-panel,
    .notice-panel {
        grid-template-columns: 1fr;
    }

    .history-panel__status {
        padding-top: var(--space-6);
        padding-left: 0;
        border-top: 1px solid var(--color-border);
        border-left: 0;
    }

    .directory-grid,
    .directory-grid--leadership,
    .leadership-grid,
    .member-grid {
        grid-template-columns: 1fr;
    }

    .person-grid .person-card:last-child,
    .potential-grid .potential-card:last-child {
        grid-column: auto;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-meta {
        justify-content: space-between;
    }

    .publication-grid,
    .gallery-card-grid,
    .gallery-detail-grid {
        grid-template-columns: 1fr;
    }

    .information-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .finance-list,
    .contact-grid,
    .map-placeholder {
        grid-template-columns: 1fr;
    }

    .contact-grid article:last-child {
        grid-column: auto;
    }

    .map-placeholder {
        align-items: start;
    }
}

@media (max-width: 34rem) {
    :root {
        --container-gutter: 1rem;
        --section-space: 4rem;
    }

    .brand__text small {
        display: none;
    }

    .hero {
        padding-top: var(--space-6);
    }

    .hero h1 {
        font-size: clamp(2.25rem, 12vw, 3.5rem);
    }

    .hero__actions,
    .hero__actions .button {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        min-height: 13rem;
    }

    .hero-visual__topline,
    .hero-visual__caption,
    .debug-panel__header {
        align-items: flex-start;
        flex-direction: column;
    }

    .hero-visual__caption span {
        text-align: left;
    }

    .content-card,
    .empty-state {
        padding: var(--space-6);
    }

    .fact-grid {
        grid-template-columns: 1fr;
    }

    .fact-item--wide {
        grid-column: auto;
    }

    .population-chart {
        padding: var(--space-2);
    }

    .population-row {
        padding: var(--space-4);
    }

    .population-row__header {
        align-items: flex-start;
        flex-direction: column;
        gap: var(--space-2);
    }

    .population-row__header p {
        justify-content: flex-start;
    }

    .cta-panel__actions,
    .cta-panel__actions .button {
        width: 100%;
    }

    .boundary-grid,
    .metric-grid,
    .metric-grid--four,
    .metric-grid--five {
        grid-template-columns: 1fr;
    }

    .data-disclaimer {
        align-items: flex-start;
        flex-direction: column;
    }

    .data-chart__header {
        flex-direction: column;
    }

    .data-chart__body,
    .details-list {
        padding-inline: var(--space-4);
    }

    .land-proportion {
        min-height: 5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}