/* Layout and components. Colors and fonts come from institution.css. */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 16px; }
body {
  margin: 0;
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-white);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
main { flex: 1 0 auto; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-link); text-decoration: none; }
a:hover { color: var(--c-primary); text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
}
h1, h2, h3, h4 { font-family: var(--f-head); color: var(--c-primary); line-height: 1.25; margin: 0; }
h2 { font-size: 28px; font-weight: 600; }
h3 { font-size: 21px; font-weight: 600; }
p { margin: 0 0 12px; }
ul, ol { margin: 0 0 12px; padding-left: 24px; }
li { margin-bottom: 6px; }
strong { font-weight: 600; }

.wrap { max-width: 1280px; margin: 0 auto; padding: 0 64px; }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 100;
  background: var(--c-white); color: var(--c-primary); padding: 10px 16px; font-weight: 600;
}
.skip-link:focus { top: 12px; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- Site header and navigation ---------- */
.site-header { background: var(--c-primary); border-top: 5px solid var(--c-accent); position: relative; z-index: 20; }
.nav-bar { display: flex; align-items: center; justify-content: space-between; min-height: 63px; }
.brand {
  font-family: var(--f-head); font-weight: 700; font-size: 20px; letter-spacing: 1px;
  color: var(--c-white);
}
.brand:hover { color: var(--c-white); text-decoration: none; }
.nav-toggle {
  display: none; background: none; border: 1px solid var(--c-line); color: var(--c-white);
  font: 600 14px var(--f-body); padding: 6px 12px; cursor: pointer;
}
.nav-list { list-style: none; margin: 0; padding: 0; display: flex; gap: 28px; align-items: center; }
.nav-list > li { margin: 0; position: relative; display: flex; align-items: center; }
.nav-list a { color: var(--c-tint-2); font-size: 15px; display: block; padding: 20px 0 16px; border-bottom: 4px solid transparent; }
.nav-list a:hover { color: var(--c-white); text-decoration: none; }
.nav-list a[aria-current="page"], .nav-list a.is-section { color: var(--c-white); border-bottom-color: var(--c-line); }
.sub-toggle {
  background: none; border: 0; color: var(--c-tint-2); padding: 4px; margin-left: 2px; cursor: pointer;
  display: inline-flex; align-items: center;
}
.sub-toggle svg { width: 12px; height: 12px; }
.sub {
  list-style: none; margin: 0; padding: 8px 0; position: absolute; top: 100%; left: -16px;
  min-width: 250px; background: var(--c-white); border-top: 4px solid var(--c-accent);
  box-shadow: 0 8px 24px rgba(12, 35, 64, .18); display: none;
}
.sub li { margin: 0; }
.sub a { color: var(--c-primary); padding: 9px 16px; border: 0; font-size: 15px; }
.sub a:hover, .sub a[aria-current="page"] { background: var(--c-tint); color: var(--c-primary); }
.has-sub:hover .sub, .has-sub:focus-within .sub, .has-sub.open .sub { display: block; }

/* ---------- Page header band ---------- */
.page-head { background: var(--c-primary); color: var(--c-tint-2); padding: 48px 0; }
.page-head .rule { display: block; width: 56px; height: 4px; background: var(--c-accent); margin-bottom: 16px; }
.page-head h1 { color: var(--c-white); font-size: 40px; font-weight: 700; max-width: 900px; }
.page-head .eyebrow { margin: 0 0 8px; }
.page-head .lede { margin: 12px 0 0; font-size: 17px; }
.page-head a { color: var(--c-tint-2); text-decoration: underline; text-decoration-color: rgba(225, 232, 242, .5); text-underline-offset: 3px; }
.page-head a:hover { color: var(--c-white); }
.eyebrow {
  font-size: 13px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--c-muted);
}
.page-head .eyebrow { color: var(--c-line); }

/* ---------- Bands ---------- */
.band { padding: 56px 0; }
.band + .band { padding-top: 0; }
.band.alt { background: var(--c-tint); padding-top: 56px; }
.band.alt + .band { padding-top: 56px; }
.section-title { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.section-title::before { content: ""; width: 56px; height: 4px; background: var(--c-accent); }
.section-title p { margin: 0; color: var(--c-muted); }

/* Two-column: main text plus aside */
.split { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 56px; align-items: start; }
.split.wide-aside { grid-template-columns: minmax(0, 1fr) 420px; }
.prose { max-width: 760px; }
.prose > :last-child { margin-bottom: 0; }

/* ---------- Home ---------- */
.director {
  background: var(--c-tint); border-top: 4px solid var(--c-accent); padding: 24px;
  display: flex; flex-direction: column; gap: 4px; font-size: 15px;
}
.director img { width: 100%; max-width: 240px; aspect-ratio: 4 / 5; object-fit: cover; margin: 8px 0 12px; }
.director p { margin: 0; }
.director .name { font-family: var(--f-head); font-size: 22px; font-weight: 700; color: var(--c-primary); }
.director .name a { color: var(--c-primary); }

.cards { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 20px; }
.card { background: var(--c-white); border: 1px solid var(--c-line); display: flex; flex-direction: column; color: var(--c-primary); }
.card:hover { text-decoration: none; border-color: var(--c-link); box-shadow: 0 6px 18px rgba(12, 35, 64, .12); }
.card .thumb { aspect-ratio: 4 / 3; background: var(--c-white); display: block; padding: 10px; border-bottom: 1px solid var(--c-line); overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: contain; }
.card .label { font-family: var(--f-head); font-weight: 600; font-size: 18px; padding: 14px 16px; line-height: 1.25; }

.facilities { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: center; }

/* ---------- Figures ---------- */
.figs { display: grid; gap: 24px; align-items: stretch; }
.figs figure { display: flex; flex-direction: column; justify-content: center; }
.figs.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.figs.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.figs figure, figure.fig { margin: 0; background: var(--c-white); padding: 12px; border: 1px solid var(--c-line); }
.figs img, figure.fig img { margin: 0 auto; }
.band.alt .figs figure { border-color: transparent; }
figcaption { font-size: 14px; color: var(--c-muted); margin-top: 8px; }
.lead-fig { max-width: 420px; margin-left: auto; }

/* Metamaterial cases */
.cases { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.case { background: var(--c-white); border: 1px solid var(--c-line); padding: 20px; }
.case h3 { font-size: 19px; margin-bottom: 14px; }
.case img + img { margin-top: 12px; }

/* ---------- Publications ---------- */
.pubs { padding-left: 28px; margin: 0; }
.pubs li { margin-bottom: 14px; padding-left: 4px; }
.pubs li::marker { color: var(--c-muted); font-size: 14px; }
.pubs.plain { list-style: none; padding-left: 0; }
.pubs.plain li { padding-left: 0; border-left: 3px solid var(--c-line); padding: 2px 0 2px 14px; }
.legend { font-size: 15px; color: var(--c-muted); margin-bottom: 16px; }
.toc {
  position: sticky; top: 24px; border-top: 4px solid var(--c-accent); padding-top: 16px;
  display: flex; flex-direction: column; gap: 10px; font-size: 15px;
}
.toc p { margin: 0; }
.toc .note { font-size: 14px; color: var(--c-muted); margin-top: 8px; }
.split.toc-left { grid-template-columns: 230px minmax(0, 1fr); }
.pub-section + .pub-section { margin-top: 48px; }
.pub-section h2 { margin-bottom: 12px; }

/* ---------- People ---------- */
.profile { display: grid; grid-template-columns: 220px minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.profile img.photo { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; }
.profile p { margin: 0 0 4px; }
.profile .name { font-family: var(--f-head); font-size: 24px; font-weight: 700; color: var(--c-primary); margin-bottom: 4px; }
.profile .block + .block { margin-top: 20px; }
.profile .block-title { margin-bottom: 8px; }
.ids { display: flex; gap: 20px; align-items: center; margin: 4px 0 12px; }
.ids img { height: 36px; width: auto; }
.ids a + a img { height: 46px; }

.people { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.person {
  display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 20px; align-items: start;
  background: var(--c-white); border: 1px solid var(--c-line); padding: 20px;
}
.band.alt .person { border-color: transparent; }
.person img { width: 150px; aspect-ratio: 4 / 5; object-fit: cover; }
.person.no-photo { grid-template-columns: minmax(0, 1fr); }
.person p { margin: 0 0 6px; font-size: 15px; }
.person .name { font-family: var(--f-head); font-size: 21px; font-weight: 700; color: var(--c-primary); margin-bottom: 6px; display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: baseline; }
.person .name a { color: var(--c-primary); }
.person .name .links { font-family: var(--f-body); font-size: 14px; font-weight: 600; display: inline-flex; gap: 14px; }
.person .name .links a { color: var(--c-link); }
.k { font-weight: 600; color: var(--c-primary); }

/* ---------- Collaborations ---------- */
.collab { border: 1px solid var(--c-line); background: var(--c-white); }
.collab + .collab { margin-top: 40px; }
.collab-main { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 40px; padding: 32px; align-items: stretch; }
/* Photo stretches to the height of the text column beside it. */
.collab-photo { position: relative; min-height: 300px; }
.collab-photo img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 30%; }
.collab-main h2 { font-size: 30px; margin-bottom: 4px; }
.collab-main .role { font-weight: 600; color: var(--c-muted); margin-bottom: 14px; }
.collab-links { display: flex; flex-wrap: wrap; gap: 8px 22px; font-weight: 600; margin-top: 4px; }
.collab-strip { background: var(--c-tint); display: flex; flex-direction: column; gap: 32px; padding: 28px 32px 32px; }
.collab-strip .eyebrow { margin-bottom: 12px; }
.collab-strip ul { margin: 0; }
.areas { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.areas li { margin: 0; background: var(--c-white); border-top: 3px solid var(--c-accent); padding: 14px 18px; display: flex; flex-direction: column; gap: 4px; }
.areas strong { font-family: var(--f-head); font-size: 18px; font-weight: 600; color: var(--c-primary); line-height: 1.3; }
.areas span { font-size: 15px; color: var(--c-muted); line-height: 1.5; }

/* ---------- Videos ---------- */
.video-group { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 32px; align-items: start; }
.video-group + .video-group { margin-top: 40px; padding-top: 40px; border-top: 1px solid var(--c-line); }
.video-group h3 { font-size: 20px; margin-bottom: 10px; }
.video-group p { margin: 0 0 2px; font-size: 15px; }
.video-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.video { position: relative; aspect-ratio: 16 / 9; background: var(--c-primary); overflow: hidden; }
.video img, .video iframe { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border: 0; }
.video .play-link { position: absolute; inset: 0; display: block; }
.video .play {
  position: absolute; left: 50%; top: 50%; width: 64px; height: 64px; margin: -32px 0 0 -32px;
  border-radius: 50%; background: rgba(12, 35, 64, .88); display: flex; align-items: center; justify-content: center;
  transition: background .15s;
}
.video .play-link:hover .play, .video .play-link:focus-visible .play { background: var(--c-link); }
.video .play svg { width: 26px; height: 26px; margin-left: 4px; }

/* ---------- Presentations ---------- */
.talks { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 32px; }
.talks li { margin: 0; background: var(--c-white); border-left: 4px solid var(--c-line); padding: 14px 18px; display: flex; flex-direction: column; gap: 8px; }
.talks li p { margin: 0; }
.talks .open { font-size: 14px; font-weight: 600; }

/* ---------- Contact ---------- */
.address p { margin: 0; }
.address .eyebrow { margin-bottom: 10px; }
.addresses { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; max-width: 900px; }
.address-card { background: var(--c-white); padding: 24px; border-top: 4px solid var(--c-accent); }
.apply { background: var(--c-tint); border-top: 4px solid var(--c-accent); padding: 24px; font-size: 15px; }
.apply p { margin: 0; }
.apply p.intro { margin-bottom: 12px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--c-primary); color: var(--c-line); font-size: 14px; padding: 32px 0; margin-top: 0; }
.site-footer .wrap { display: flex; justify-content: space-between; align-items: center; gap: 16px 32px; flex-wrap: wrap; }
.site-footer a { color: var(--c-tint-2); }
.site-footer a:hover { color: var(--c-white); }
.site-footer .links { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* ---------- Home: quiet note about the old Google Site ---------- */
.band.moved-note { padding: 0 0 32px; }
.moved-note p { margin: 0; font-size: 13px; color: var(--c-muted); }

/* ---------- 404 ---------- */
.notfound { padding: 72px 0; }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .wrap { padding: 0 40px; }
  .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .profile { grid-template-columns: 200px minmax(0, 1fr); }
  .profile .col-3 { grid-column: 2; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-block; }
  .js #site-nav { display: none; width: 100%; }
  .js .site-header.nav-open #site-nav { display: block; }
  .nav-bar { flex-wrap: wrap; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding: 4px 0 16px; }
  .nav-list > li { flex-wrap: wrap; border-top: 1px solid var(--c-primary-2); }
  .nav-list a { padding: 12px 0; border-bottom: 0; }
  .nav-list a[aria-current="page"], .nav-list a.is-section { border-bottom: 0; box-shadow: inset 4px 0 0 var(--c-line); padding-left: 12px; }
  .sub-toggle { display: none; }
  .sub { display: block; position: static; box-shadow: none; background: none; border: 0; padding: 0 0 8px 16px; min-width: 0; width: 100%; }
  .sub a { color: var(--c-tint-2); padding: 8px 0; }
  .sub a:hover, .sub a[aria-current="page"] { background: none; color: var(--c-white); }
  .split, .split.wide-aside, .split.toc-left { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .toc { position: static; }
  .lead-fig { margin: 0 auto; }
  .people { grid-template-columns: minmax(0, 1fr); }
  .video-group { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .facilities { grid-template-columns: minmax(0, 1fr); gap: 24px; }
}

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
  .page-head { padding: 36px 0; }
  .page-head h1 { font-size: 30px; }
  h2 { font-size: 25px; }
  .band, .band.alt, .band.alt + .band { padding: 40px 0; }
  .band + .band { padding-top: 0; }
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
  .card .label { font-size: 16px; padding: 10px 12px; }
  .figs.cols-2, .figs.cols-3, .cases, .talks, .addresses { grid-template-columns: minmax(0, 1fr); }
  .profile { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .profile img.photo { max-width: 220px; }
  .profile .col-3 { grid-column: auto; }
  .person { grid-template-columns: 96px minmax(0, 1fr); gap: 14px; padding: 16px; }
  .person img { width: 96px; }
  .collab-main { grid-template-columns: minmax(0, 1fr); padding: 20px; gap: 20px; }
  .collab-photo { min-height: 0; max-width: 240px; aspect-ratio: 570 / 802; }
  .collab-strip { padding: 20px; gap: 24px; }
  .areas { grid-template-columns: minmax(0, 1fr); }
  .video-grid { grid-template-columns: minmax(0, 1fr); }
  .site-footer .wrap { flex-direction: column; align-items: flex-start; }
  .site-footer .links { flex-direction: column; align-items: flex-start; gap: 6px; }
  .site-footer .links span { display: none; }
}

@media print {
  .site-header, .site-footer, .video, .skip-link { display: none; }
  .page-head { background: none; color: #000; padding: 0 0 16px; }
  .page-head h1 { color: #000; }
}