/* ==========================================================================
   TD&K Lab — the only stylesheet.

   Everything tunable lives in :root below. Change a value there and the whole
   site follows; templates carry no colours, sizes or spacing of their own.
   ========================================================================== */

:root {
  /* Colour ---------------------------------------------------------------- */
  --color-accent:        #8a1c2b;   /* bordeaux, in the spirit of the old site */
  --color-accent-dark:   #61131e;
  --color-accent-tint:   #f7eef0;
  --color-text:          #1a1a1a;
  --color-muted:         #5b5b5b;   /* 6.4:1 on white */
  --color-faint:         #767676;   /* 4.6:1 on white — smallest allowed */
  --color-line:          #e3e1de;
  --color-line-strong:   #c9c6c1;
  --color-bg:            #ffffff;
  --color-surface:       #f8f7f5;
  --color-focus:         #0b57d0;

  /* Type ------------------------------------------------------------------ */
  --font-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-display: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino,
                  "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --size-xs:   0.78rem;
  --size-sm:   0.875rem;
  --size-base: 1rem;
  --size-md:   1.125rem;
  --size-lg:   1.375rem;
  --size-xl:   1.75rem;
  --size-2xl:  2.25rem;
  --size-3xl:  2.875rem;

  --leading-tight: 1.2;
  --leading-snug:  1.4;
  --leading-body:  1.65;

  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold:   700;

  /* Space ----------------------------------------------------------------- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;

  /* Measure --------------------------------------------------------------- */
  --measure-wide:  72rem;   /* grids and listings */
  --measure-prose: 44rem;   /* running text */

  /* Height of the sticky header: logo + padding above and below. Anchor
     targets are pushed down by this much so the header never hides them. */
  --header-h: calc(2.75rem + 2 * var(--space-4));

  --radius:    3px;
  --radius-lg: 6px;

  --rule: 1px solid var(--color-line);
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

/* scroll-padding-top keeps in-page anchors clear of the sticky header, for
   the skip link, the /people/ jump list and every #fragment link. */
html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--size-base);
  line-height: var(--leading-body);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-normal);
  line-height: var(--leading-tight);
  margin: 0 0 var(--space-4);
  text-wrap: balance;
}

h1 { font-size: var(--size-3xl); letter-spacing: -0.015em; }
h2 { font-size: var(--size-xl); }
h3 { font-size: var(--size-md); font-family: var(--font-body); font-weight: var(--weight-medium); }

p { margin: 0 0 var(--space-4); }

a { color: var(--color-accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--color-accent-dark); }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius);
}

img { max-width: 100%; height: auto; display: block; }

ul, ol { margin: 0 0 var(--space-4); padding-left: var(--space-5); }

hr { border: 0; border-top: var(--rule); margin: var(--space-7) 0; }

code, pre { font-family: var(--font-mono); font-size: 0.9em; }
pre {
  background: var(--color-surface);
  padding: var(--space-4);
  border-radius: var(--radius);
  overflow-x: auto;
}

table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: var(--space-2) var(--space-3); border-bottom: var(--rule); }

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -4rem;
  z-index: 30;
  background: var(--color-bg);
  color: var(--color-accent);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
  transition: top 0.1s;
}
.skip-link:focus { top: var(--space-3); }

/* --------------------------------------------------------------------------
   Layout primitives
   -------------------------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--measure-wide);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.wrap--prose { max-width: calc(var(--measure-prose) + 2 * var(--space-5)); }

.main { flex: 1 0 auto; padding-block: var(--space-7) var(--space-8); }

.section { margin-block: var(--space-8) 0; }
.section:first-child { margin-block-start: 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  border-bottom: var(--rule);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-5);
}
.section__head h2 { margin: 0; }
.section__more { font-size: var(--size-sm); }

.section__title {
  border-bottom: var(--rule);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-5);
}

.lede {
  font-size: var(--size-md);
  color: var(--color-muted);
  max-width: var(--measure-prose);
}

.meta { font-size: var(--size-sm); color: var(--color-faint); margin-bottom: var(--space-2); }
.muted { color: var(--color-muted); }

.breadcrumb {
  font-size: var(--size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}
.breadcrumb a { color: var(--color-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-accent); text-decoration: underline; }

.img--wide {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.tag {
  display: inline-block;
  font-size: var(--size-xs);
  line-height: 1.6;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  color: var(--color-muted);
  white-space: nowrap;
}
.tag--muted { border-style: dashed; }
.tag--link { color: var(--color-accent); text-decoration: none; }
.tag--link:hover { background: var(--color-accent-tint); border-color: var(--color-accent); }

/* Running text ------------------------------------------------------------ */

.prose { max-width: var(--measure-prose); }
.prose h2 { margin-top: var(--space-6); }
.prose h3 { margin-top: var(--space-5); }
.prose img { border-radius: var(--radius-lg); margin-block: var(--space-5); }
.prose li { margin-bottom: var(--space-2); }
.prose blockquote {
  margin: var(--space-5) 0;
  padding-left: var(--space-4);
  border-left: 3px solid var(--color-line-strong);
  color: var(--color-muted);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: var(--rule);
  background: var(--color-bg);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding-block: var(--space-4);
}

.site-header__brand {
  display: flex;
  align-items: center;
  color: var(--color-text);
  text-decoration: none;
  margin-right: auto;
}
/* The logo is a wordmark that spells the lab name, so it stands alone in the
   header: sized by height, width follows the 448x86 aspect ratio. */
.site-header__logo { height: 2.75rem; width: auto; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: var(--size-sm);
  padding-block: var(--space-1);
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--color-accent); }
.site-nav a[aria-current="page"] {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  background: none;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  color: var(--color-text);
  font: inherit;
  font-size: var(--size-sm);
  padding: var(--space-1) var(--space-3);
  cursor: pointer;
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  content: "";
}
.nav-toggle__bars { position: relative; }
.nav-toggle__bars::before { position: absolute; top: -5px; }
.nav-toggle__bars::after  { position: absolute; top: 5px; }

/* --------------------------------------------------------------------------
   Home
   -------------------------------------------------------------------------- */

.hero { padding-bottom: var(--space-6); }
.hero__title { font-size: var(--size-3xl); margin-bottom: var(--space-5); }
.hero p { font-size: var(--size-md); }

/* Cards ------------------------------------------------------------------- */

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
}

.card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: inherit;
  text-decoration: none;
}
.card__image {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.card__image--empty { display: block; }
.card__body { display: block; padding-top: var(--space-3); }
.card__meta {
  display: block;
  font-size: var(--size-xs);
  color: var(--color-faint);
  margin-bottom: var(--space-1);
}
.card__title {
  display: block;
  font-family: var(--font-display);
  font-size: var(--size-md);
  line-height: var(--leading-snug);
  margin-bottom: var(--space-2);
}
.card__text {
  display: block;
  font-size: var(--size-sm);
  color: var(--color-muted);
  line-height: var(--leading-snug);
}
.card__link:hover .card__title { color: var(--color-accent); }

/* --------------------------------------------------------------------------
   People
   -------------------------------------------------------------------------- */

.jump {
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-4);
  border-bottom: var(--rule);
}
.jump ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--size-sm);
}

.people {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-5) var(--space-6);
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
}

/* Cards stretch to the row height, so the rule lands on the same baseline
   across a row however uneven the text is — the same separator the
   publication, teaser and guide lists use. */
.person {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: var(--space-4);
  align-items: start;
  padding-bottom: var(--space-5);
  border-bottom: var(--rule);
  scroll-margin-top: var(--space-6);
}

.person__photo {
  width: 5.5rem;
  height: 5.5rem;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.person__photo--empty {
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: var(--size-lg);
  color: var(--color-faint);
  border: 1px solid var(--color-line);
}

.person__name { margin: 0 0 var(--space-1); font-size: var(--size-md); }
.person__role,
.person__advisors,
.person__interests {
  margin: 0 0 var(--space-2);
  font-size: var(--size-sm);
  color: var(--color-muted);
  line-height: var(--leading-snug);
}
.person__role { color: var(--color-text); }

.person__contact {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--size-sm);
  color: var(--color-faint);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
}

.people-compact {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 3 15rem;
  column-gap: var(--space-6);
}
.person-compact {
  break-inside: avoid;
  margin-bottom: var(--space-3);
  font-size: var(--size-sm);
  line-height: var(--leading-snug);
  scroll-margin-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 var(--space-2);
}
.person-compact__name { color: var(--color-text); }
.person-compact__degree { color: var(--color-faint); font-size: var(--size-xs); }
.person-compact__links a { font-size: var(--size-xs); }
.person-compact__links a + a { margin-left: var(--space-2); }

.people-inline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  font-size: var(--size-sm);
}
.people-inline li { display: flex; align-items: baseline; gap: var(--space-2); }

/* --------------------------------------------------------------------------
   Publications
   -------------------------------------------------------------------------- */

.pub-year { scroll-margin-top: var(--space-6); }
.pub-list { list-style: none; margin: 0; padding: 0; }

.pub {
  padding-block: var(--space-5);
  border-bottom: var(--rule);
  scroll-margin-top: var(--space-6);
}
.pub:first-child { padding-top: 0; }

.pub__title {
  font-family: var(--font-display);
  font-size: var(--size-md);
  font-weight: var(--weight-normal);
  margin: 0 0 var(--space-2);
  max-width: var(--measure-prose);
}
.pub__title a { color: var(--color-text); text-decoration: none; }
.pub__title a:hover { color: var(--color-accent); text-decoration: underline; }

.pub__authors { margin: 0 0 var(--space-1); font-size: var(--size-sm); color: var(--color-muted); }
.pub__author--member { color: var(--color-text); font-weight: var(--weight-medium); text-decoration: none; }
.pub__author--member:hover { color: var(--color-accent); text-decoration: underline; }

.pub__venue { margin: 0 0 var(--space-3); font-size: var(--size-sm); color: var(--color-faint); }

.pub__links {
  margin: 0 0 var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--size-sm);
}

.pub__areas {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.pub__abstract { margin-top: var(--space-3); max-width: var(--measure-prose); }
.pub__abstract summary {
  cursor: pointer;
  font-size: var(--size-sm);
  color: var(--color-accent);
  width: fit-content;
}
.pub__abstract p { font-size: var(--size-sm); color: var(--color-muted); margin-top: var(--space-3); }

/* --------------------------------------------------------------------------
   News
   -------------------------------------------------------------------------- */

.teasers { list-style: none; margin: 0; padding: 0; }

.teaser {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: var(--space-5);
  padding-block: var(--space-5);
  border-bottom: var(--rule);
}
.teaser:first-child { padding-top: 0; }
.teaser:not(:has(.teaser__thumb)) { grid-template-columns: 1fr; }

.teaser__thumb img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--color-surface);
}

.teaser__title {
  font-family: var(--font-display);
  font-size: var(--size-md);
  font-weight: var(--weight-normal);
  margin: 0 0 var(--space-2);
  max-width: var(--measure-prose);
}
.teaser__title a { color: var(--color-text); text-decoration: none; }
.teaser__title a:hover { color: var(--color-accent); text-decoration: underline; }
.teaser__text {
  margin: 0;
  font-size: var(--size-sm);
  color: var(--color-muted);
  max-width: var(--measure-prose);
}

.news-item__cover { margin-bottom: var(--space-6); }
.news-item .meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }

.gallery {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
}
.gallery img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--color-surface);
}

/* --------------------------------------------------------------------------
   Areas, projects, guides
   -------------------------------------------------------------------------- */

.area__header { margin-bottom: var(--space-5); }
.area__figure { margin-bottom: var(--space-6); }

.projects { list-style: none; margin: 0; padding: 0; }
.project {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: var(--space-6);
  padding-block: var(--space-6);
  border-bottom: var(--rule);
}
.project:not(:has(.project__image)) { grid-template-columns: 1fr; }
.project:first-child { padding-top: 0; }
.project__image {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.project__title { font-size: var(--size-lg); margin-bottom: var(--space-2); }
.project__advisors { font-size: var(--size-sm); color: var(--color-muted); }
.project__audience { display: flex; gap: var(--space-2); margin-bottom: var(--space-4); }

.guides { list-style: none; margin: 0; padding: 0; }
.guide { padding-block: var(--space-5); border-bottom: var(--rule); }
.guide:first-child { padding-top: 0; }
.guide__title { font-size: var(--size-md); margin-bottom: var(--space-2); }
.guide__summary { margin-bottom: var(--space-2); color: var(--color-muted); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  flex-shrink: 0;
  border-top: var(--rule);
  background: var(--color-surface);
  padding-block: var(--space-6);
  font-size: var(--size-sm);
  color: var(--color-muted);
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.site-footer__affiliations { display: flex; align-items: center; gap: var(--space-5); }
.site-footer__affiliation img { height: 44px; width: auto; object-fit: contain; }
.site-footer__meta { text-align: right; }
.site-footer__copyright { margin: 0 0 var(--space-1); }
.site-footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-4);
  justify-content: flex-end;
}

/* --------------------------------------------------------------------------
   Narrow screens
   -------------------------------------------------------------------------- */

@media (max-width: 48rem) {
  :root { --size-3xl: 2.125rem; --size-2xl: 1.75rem; --size-xl: 1.5rem; }

  /* nav.js unhides the toggle; without JS the nav simply stays open. */
  .nav-toggle[hidden] { display: none; }
  .nav-toggle { display: flex; }

  .site-nav { flex-basis: 100%; }
  .site-nav[data-collapsed="true"] { display: none; }
  /* The open menu must never grow past the viewport on a short screen. */
  .site-nav { max-height: calc(100vh - var(--header-h)); overflow-y: auto; }
  .site-nav__list { flex-direction: column; gap: 0; }
  .site-nav__list li { border-top: var(--rule); }
  .site-nav a { display: block; padding-block: var(--space-3); border-bottom: 0; }
  .site-nav a[aria-current="page"] { color: var(--color-accent); }

  .site-footer__inner { flex-direction: column; align-items: flex-start; }
  .site-footer__meta { text-align: left; }
  .site-footer__links { justify-content: flex-start; }
}

@media (max-width: 34rem) {
  .teaser { grid-template-columns: 1fr; gap: var(--space-3); }
  .teaser__thumb img { aspect-ratio: 16 / 9; }
  .project { grid-template-columns: 1fr; gap: var(--space-4); }
  .person { grid-template-columns: 4.5rem 1fr; gap: var(--space-3); }
  .person__photo { width: 4.5rem; height: 4.5rem; }
  .people-compact { columns: 1; }
  .wrap { padding-inline: var(--space-4); }
  .site-header__logo { height: 2.125rem; }
  :root { --header-h: calc(2.125rem + 2 * var(--space-4)); }
}

@media print {
  .site-header, .site-footer, .jump, .skip-link { display: none; }
  body { font-size: 11pt; }
  a { color: inherit; text-decoration: none; }
  .pub__abstract { display: none; }
}