@media (max-width: 1100px) {
    .primary-nav { gap: 17px; }
    .primary-nav > a:not(.button) { font-size: 12px; }
    .hero-layout { grid-template-columns: 1fr 390px; gap: 30px; }
    .focus-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .purpose-grid { grid-template-columns: 90px 1fr; }
    .value-stack { grid-column: 2; }
    .project-grid, .news-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .leader-card { grid-template-columns: 160px 1fr; }
    .portrait { height: 220px; }
    .department-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .career-path { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .career-step:nth-child(3) { border-right: 0; }
    .career-step:nth-child(-n + 3) { border-bottom: 1px solid var(--line); }
    .member-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .contact-layout { grid-template-columns: 1fr 1.2fr; gap: 45px; }
    .footer-grid { grid-template-columns: 1.3fr repeat(3, 1fr); gap: 30px; }
}

@media (max-width: 900px) {
    .site-header { padding: 12px 0; }
    .brand-copy small { display: none; }
    .nav-toggle { display: block; }
    .primary-nav {
        position: fixed;
        inset: 67px 0 auto;
        display: grid;
        max-height: calc(100vh - 67px);
        padding: 28px 24px 40px;
        overflow-y: auto;
        background: rgba(23, 17, 31, .98);
        border-top: 1px solid var(--line-dark);
        transform: translateY(-130%);
        opacity: 0;
        transition: transform 240ms ease, opacity 180ms ease;
    }
    .primary-nav.is-open { transform: translateY(0); opacity: 1; }
    .primary-nav > a:not(.button) { padding: 8px 0; font-family: var(--display); font-size: 22px; }
    .nav-toggle[aria-expanded="true"] > span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
    .nav-toggle[aria-expanded="true"] > span:nth-child(2) { opacity: 0; }
    .nav-toggle[aria-expanded="true"] > span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
    .hero { min-height: auto; padding-top: 150px; }
    .hero-layout { grid-template-columns: 1fr; }
    .hero-visual { min-height: 470px; }
    .research-core { width: 430px; }
    .hero-index { display: none; }
    .split-heading { grid-template-columns: 1fr; gap: 28px; }
    .purpose-grid { grid-template-columns: 1fr; }
    .purpose-index { display: none; }
    .value-stack { grid-column: auto; }
    .leader-grid { grid-template-columns: 1fr; }
    .value-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .detail-hero-grid { grid-template-columns: 1fr; }
    .detail-mark { width: 240px; height: 240px; font-size: 50px; }
    .article-layout { grid-template-columns: 1fr; gap: 45px; }
    .article-layout aside { padding-bottom: 30px; border-bottom: 1px solid var(--line); }
    .member-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .simple-card-grid, .compact-people { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .contact-layout { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-brand { grid-column: 1 / -1; }
    .error-layout { grid-template-columns: 1fr; }
    .error-code { min-height: 190px; border-right: 0; border-bottom: 1px solid var(--line-dark); }
    .error-code strong { font-size: 130px; }
    .error-code strong i { width: 76px; height: 76px; }
}

@media (max-width: 640px) {
    .container { width: min(calc(100% - 32px), var(--container)); }
    .section { padding: 82px 0; }
    .hero { padding-top: 130px; }
    .hero h1, .page-hero h1, .detail-hero h1, .article-hero h1 { font-size: clamp(45px, 14vw, 66px); }
    .hero-actions { align-items: stretch; flex-direction: column; }
    .hero-proof { margin-top: 45px; }
    .hero-visual { min-height: 360px; }
    .research-core { width: 310px; }
    .data-chip { min-width: 104px; padding: 8px 10px; }
    .chip-one { right: -2%; }
    .chip-two { left: -1%; }
    .stat-grid, .focus-grid, .project-grid, .news-grid, .value-card-grid, .department-grid, .member-grid, .simple-card-grid, .compact-people { grid-template-columns: 1fr; }
    .stat-item:nth-child(odd) { border-left: 1px solid var(--line-dark); }
    .focus-card { min-height: 280px; }
    .section-heading h2, .purpose-copy h2 { font-size: 42px; }
    .leader-card { grid-template-columns: 1fr; }
    .portrait { height: 310px; }
    .inline-heading { align-items: flex-start; flex-direction: column; }
    .partner-section .container { align-items: flex-start; flex-direction: column; gap: 28px; }
    .partner-row { justify-content: flex-start; }
    .page-hero, .detail-hero, .article-hero { padding: 145px 0 78px; }
    .statement-grid { grid-template-columns: 1fr; gap: 20px; }
    .career-path { grid-template-columns: 1fr; }
    .career-step, .career-step:nth-child(3) { border-right: 0; border-bottom: 1px solid var(--line); }
    .career-step::after { top: auto; right: 24px; bottom: -5px; }
    .research-row { grid-template-columns: 45px 1fr 28px; gap: 16px; padding: 28px 8px; }
    .research-code { display: none; }
    .research-row h2 { font-size: 25px; }
    .detail-mark { width: 190px; height: 190px; font-size: 42px; }
    .filter-bar > span { width: 100%; margin-bottom: 8px; }
    .publication-row, .job-row { grid-template-columns: 1fr; gap: 15px; }
    .publication-actions { justify-content: flex-start; }
    .form-grid { grid-template-columns: 1fr; }
    .form-field-wide { grid-column: auto; }
    .contact-form-card { padding: 28px 20px; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-brand { grid-column: auto; }
    .footer-bottom { flex-direction: column; gap: 8px; }
    .error-page { padding-top: 125px; }
    .error-code { min-height: 140px; }
    .error-code strong { font-size: 92px; }
    .error-code strong i { width: 54px; height: 54px; margin-inline: 6px; }
    .error-copy h1 { font-size: 47px; }
    .error-actions { align-items: stretch; flex-direction: column; }
    .error-orbit { right: -350px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        scroll-behavior: auto !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }
    .reveal { opacity: 1; transform: none; }
}