/* MATRIS Science Lab — main stylesheet
   Palette and type follow the official MATRIS roll-up (2026-10-02) and the
   University of Salzburg web rules: primary green, Cambria for headlines, Franklin Gothic for
   body text, white ground, the logo's grey for neutral marks. FH orange (FH CD manual) is
   used only to mark FH Salzburg items. Logos are shown unchanged. */

/* Libre Franklin (SIL OFL, self-hosted, no third-party requests) as the free
   stand-in for the University of Salzburg body typeface Franklin Gothic. */
@font-face { font-family: "Libre Franklin"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/libre-franklin-400.woff2") format("woff2"); }
@font-face { font-family: "Libre Franklin"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/libre-franklin-600.woff2") format("woff2"); }
@font-face { font-family: "Libre Franklin"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/libre-franklin-700.woff2") format("woff2"); }

:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f5;
  --bg-muted: #e9ecea;
  --ink: #161816;
  --ink-soft: #464a47;
  --ink-muted: #6a6f6c;
  --line: #d7dcd9;
  --accent: #306657;       /* University of Salzburg / roll-up green */
  --accent-strong: #234c41;
  --accent-soft: #e6efec;
  --on-accent: #ffffff;
  --grey: #7a7a7a;         /* MATRIS logo grey */
  --plus: #306657;
  --plus-soft: #e6efec;
  --fhs: #c43d00;          /* FH orange #ff5000, darkened for text contrast */
  --fhs-mark: #ff5000;
  --fhs-soft: #fff0e8;
  --joint: #4f5452;
  --joint-soft: #eceeed;
  --radius: 10px;
  --wrap: 72rem;
  --font: "Franklin Gothic Book", "Franklin Gothic", "ITC Franklin Gothic", "Libre Franklin", system-ui, Arial, sans-serif;
  --font-head: Cambria, "Cambria Math", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111413;
    --bg-soft: #181c1b;
    --bg-muted: #222826;
    --ink: #eceeed;
    --ink-soft: #c3c8c5;
    --ink-muted: #969c99;
    --line: #2f3633;
    --accent: #7fc0ac;
    --accent-strong: #a6d6c7;
    --accent-soft: #1b2b26;
    --on-accent: #0d1a16;
    --grey: #a5a5a5;
    --plus: #7fc0ac;
    --plus-soft: #1b2b26;
    --fhs: #ff8a4d;
    --fhs-soft: #33200f;
    --joint: #c9cecb;
    --joint-soft: #262a28;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1.0625rem/1.65 var(--font); }
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-strong); text-decoration-thickness: 2px; }
h1, h2, h3 { font-family: var(--font-head); font-weight: 700; line-height: 1.2; margin: 2em 0 0.6em; color: var(--accent); }
h3 { color: var(--ink); }
h4 { line-height: 1.3; font-weight: 650; margin: 1.5em 0 .5em; }
h1 { font-size: clamp(2rem, 4vw, 2.75rem); margin-top: 0; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.muted { color: var(--ink-muted); font-size: 0.92rem; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 1rem; }
@media (min-width: 48rem) { .wrap { padding: 0 2rem; } }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--on-accent); padding: .5rem 1rem; z-index: 10; }
.skip-link:focus { left: 1rem; }

/* ---------- co-branding band (as on the roll-up: always white) ---------- */
.cobrand { background: #ffffff; border-bottom: 1px solid #e3e3e3; }
.cobrand__inner { display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; padding-top: .6rem; padding-bottom: .6rem; }
.cobrand__logo { display: block; line-height: 0; }
.cobrand__logo img { height: 40px; width: auto; }
.cobrand__logo--fhs img { height: 44px; }
@media (max-width: 36rem) { .cobrand__logo img { height: 30px; } .cobrand__logo--fhs img { height: 34px; } }

/* ---------- header ---------- */
.site-header { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.site-header__inner { display: flex; align-items: center; gap: 1rem; min-height: 4.5rem; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: .75rem; color: var(--ink); text-decoration: none; margin-right: auto; padding: .5rem 0; }
.brand:hover { color: var(--ink); }
.brand__logo { display: block; width: 120px; height: auto; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; padding-left: .85rem; border-left: 1px solid var(--line); }
.brand__name { font-family: var(--font-head); font-weight: 700; font-size: 1.3rem; color: var(--accent); }
.brand__sub { font-size: .74rem; color: var(--ink-muted); }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: .15rem; flex-wrap: wrap; }
.site-nav a { display: block; padding: .45rem .7rem; border-radius: 6px; color: var(--ink-soft); text-decoration: none; font-size: .95rem; font-weight: 500; }
.site-nav a:hover { background: var(--bg-soft); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle__label { display: none; }

@media (max-width: 64rem) {
  .brand__sub { display: none; }
  .brand__logo { width: 100px; }
  .nav-toggle__label { display: flex; width: 2.5rem; height: 2.5rem; align-items: center; justify-content: center; cursor: pointer; border-radius: 6px; }
  .nav-toggle:focus-visible + .nav-toggle__label { outline: 2px solid var(--accent); }
  .nav-toggle__bars, .nav-toggle__bars::before, .nav-toggle__bars::after { display: block; width: 1.25rem; height: 2px; background: var(--ink); position: relative; content: ""; }
  .nav-toggle__bars::before { position: absolute; top: -6px; }
  .nav-toggle__bars::after { position: absolute; top: 6px; }
  .site-nav { display: none; width: 100%; padding-bottom: .75rem; }
  .nav-toggle:checked ~ .site-nav { display: block; }
  .site-nav ul { flex-direction: column; }
}

/* ---------- page heads ---------- */
.page-head { padding: 3rem 0 2rem; border-bottom: 1px solid var(--line); margin-bottom: 2.5rem; background: linear-gradient(180deg, var(--bg-soft), var(--bg)); }
.kicker { text-transform: uppercase; letter-spacing: .1em; font-size: .78rem; font-weight: 600; color: var(--ink-muted); margin-bottom: .75rem; }
.kicker a { color: inherit; }
.lead { font-size: 1.2rem; color: var(--ink-soft); max-width: 46rem; margin: 0; }
.prose { padding-bottom: 4rem; }
.prose > p, .prose > ul, .prose > ol { max-width: 46rem; }
.back { margin-top: 3rem; }

/* ---------- home ---------- */
.hero { padding: 3.5rem 0 3rem; border-bottom: 1px solid var(--line); }
.hero__grid { display: grid; gap: 2rem; align-items: center; grid-template-columns: 1fr; }
@media (min-width: 56rem) { .hero__grid { grid-template-columns: 1fr 17rem; } }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); margin-bottom: .4em; }
.hero__claim { font-size: 1.25rem; color: var(--ink-soft); max-width: 42rem; margin-bottom: 1.75rem; }
.hero__logo { justify-self: center; width: 100%; max-width: 17rem; }
.hero__logo img { display: block; width: 100%; }
@media (prefers-color-scheme: dark) { .hero__logo img { background: #fff; border-radius: 50%; padding: 3%; } }
.btn { display: inline-block; padding: .65rem 1.1rem; border-radius: 8px; background: var(--accent); color: var(--on-accent); text-decoration: none; font-weight: 600; font-size: .95rem; }
.btn:hover { background: var(--accent-strong); color: var(--on-accent); }
.btn--ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); }
.btn--ghost:hover { background: var(--accent-soft); color: var(--accent); }
.btn + .btn { margin-left: .5rem; }

.dual { display: grid; grid-template-columns: 1fr; margin: 3rem 0 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (min-width: 56rem) { .dual { grid-template-columns: 1fr auto 1fr; } }
.strand { padding: 2rem; position: relative; }
.strand::before { content: ""; position: absolute; left: 0; top: 0; right: 0; height: 4px; }
.strand--plus::before { background: var(--plus); }
.strand--fhs::before { background: var(--fhs-mark); }
.strand h3 { margin-top: .25rem; font-size: 1.35rem; }
.strand ul { padding-left: 1.1rem; margin: 0; color: var(--ink-soft); }
.strand li { margin: .3rem 0; }
.strand__inst { font-size: .78rem; font-weight: 650; text-transform: uppercase; letter-spacing: .08em; margin-bottom: .25rem; }
.strand--plus .strand__inst { color: var(--plus); }
.strand--fhs .strand__inst { color: var(--fhs); }
.strand__mode { font-size: .9rem; color: var(--ink-muted); margin-bottom: 1rem; }
.bridge { display: flex; align-items: center; justify-content: center; padding: 1rem 1.5rem; background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: center; }
@media (min-width: 56rem) { .bridge { border: 0; border-left: 1px solid var(--line); border-right: 1px solid var(--line); writing-mode: vertical-rl; transform: rotate(180deg); padding: 1.5rem .9rem; } }
.bridge span { font-size: .78rem; font-weight: 650; letter-spacing: .12em; text-transform: uppercase; color: var(--grey); white-space: nowrap; }

.section { padding: 1.5rem 0 2.5rem; }
.section__head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; border-bottom: 1px solid var(--line); margin-bottom: 1.25rem; }
.section__head h2 { margin: 0 0 .5rem; }
.section__head a { font-size: .9rem; }

/* ---------- affiliation tags ---------- */
.aff { display: inline-flex; align-items: center; gap: .35rem; font-size: .72rem; font-weight: 650; letter-spacing: .04em; text-transform: uppercase; padding: .15rem .5rem; border-radius: 999px; white-space: nowrap; vertical-align: middle; }
.aff--plus { background: var(--plus-soft); color: var(--plus); }
.aff--fhs { background: var(--fhs-soft); color: var(--fhs); }
.aff--joint { background: var(--joint-soft); color: var(--joint); }
.tag { display: inline-block; font-size: .75rem; color: var(--ink-muted); border: 1px solid var(--line); border-radius: 999px; padding: .05rem .5rem; margin-left: .35rem; vertical-align: middle; }

/* ---------- filter bar ---------- */
.filters { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0 0 1.5rem; }
.filters button { font: inherit; font-size: .88rem; padding: .35rem .85rem; border-radius: 999px; border: 1px solid var(--line); background: var(--bg); color: var(--ink-soft); cursor: pointer; }
.filters button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
[data-aff].is-hidden, [data-group].is-hidden { display: none !important; }

/* ---------- cards / grids ---------- */
.grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem; background: var(--bg); display: flex; flex-direction: column; gap: .5rem; }
.card h3 { margin: 0; }
.card p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.card__meta { font-size: .85rem; color: var(--ink-muted); }
.card__foot { margin-top: auto; padding-top: .5rem; display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }

/* people */
.team-units { display: grid; gap: 2rem; grid-template-columns: 1fr; margin-top: 2rem; }
@media (min-width: 56rem) { .team-units { grid-template-columns: 1fr 1fr; } }
.team-unit { border-top: 4px solid var(--line); padding-top: 1rem; }
.team-unit--plus { border-color: var(--plus); }
.team-unit--fhs { border-color: var(--fhs-mark); }
.team-unit h2 { margin: .1rem 0 .2rem; font-size: 1.35rem; }
.team-unit .grid { grid-template-columns: 1fr; margin-top: 1rem; }
.person { flex-direction: row; gap: 1rem; align-items: flex-start; }
.avatar { flex: none; width: 4.5rem; height: 4.5rem; border-radius: 50%; background: var(--bg-muted); display: grid; place-items: center; font-weight: 700; color: var(--ink-muted); overflow: hidden; }
.person--lead .avatar { width: 7rem; height: 7rem; font-size: 1.6rem; }
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.person__role { font-size: .92rem; color: var(--ink-soft); }
.person__links { font-size: .88rem; display: flex; flex-wrap: wrap; gap: .25rem .9rem; margin-top: .25rem; }
.person__bio { margin-top: .5rem !important; }
@media (max-width: 36rem) { .person { flex-direction: column; } .person--lead .avatar { width: 5.5rem; height: 5.5rem; font-size: 1.3rem; } }

/* projects */
.project__period { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-muted); }
.status { font-size: .72rem; font-weight: 650; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted); }
.status--running { color: var(--accent); }
.instances { list-style: none; padding: 0; margin: .5rem 0 0; display: grid; gap: .5rem; }
.instances__label { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 650; color: var(--ink-muted); margin-top: .5rem !important; }
.instance { border-left: 3px solid var(--line); padding: .35rem 0 .35rem .75rem; font-size: .88rem; color: var(--ink-soft); }
.instance--plus { border-color: var(--plus); }
.instance--fhs { border-color: var(--fhs-mark); }
.instance__head { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.instance__title { display: block; color: var(--ink); margin-top: .15rem; }
.pure-links { display: flex; gap: .75rem 1.5rem; flex-wrap: wrap; margin-top: 2rem; font-size: .92rem; }

/* ---------- lists: news, events, publications ---------- */
.news-list, .event-list, .pub-list { list-style: none; padding: 0; margin: 0; }
.news-item { display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--line); }
.news-item time { color: var(--ink-muted); font-size: .88rem; font-variant-numeric: tabular-nums; padding-top: .15rem; }
.news-item__title { font-weight: 600; color: var(--ink); text-decoration: none; }
.news-item__title:hover { color: var(--accent); text-decoration: underline; }
.news-item p { margin: .25rem 0 0; color: var(--ink-soft); font-size: .95rem; }
@media (max-width: 36rem) { .news-item { grid-template-columns: 1fr; gap: .25rem; } }

.event { display: grid; grid-template-columns: 4.5rem 1fr; gap: 1.25rem; padding: 1.25rem 0; border-bottom: 1px solid var(--line); }
.event__date { text-align: center; border: 1px solid var(--line); border-radius: 8px; padding: .4rem 0; line-height: 1.1; height: fit-content; }
.event__date b { display: block; font-size: 1.5rem; font-family: var(--font-head); color: var(--accent); }
.event__date span { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted); }
.event h3 { margin: 0 0 .25rem; font-size: 1.1rem; }
.event__meta { font-size: .88rem; color: var(--ink-muted); margin-bottom: .4rem; }
.event p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.event__type { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 650; color: var(--ink-muted); }

.pub-year { font-size: 1.2rem; margin: 2rem 0 .5rem; color: var(--grey); font-variant-numeric: tabular-nums; }
.pub { padding: .9rem 0; border-bottom: 1px solid var(--line); }
.pub__title { font-weight: 600; }
.pub__authors { color: var(--ink-soft); font-size: .95rem; }
.pub__authors .me { font-weight: 600; color: var(--ink); }
.pub__venue { font-style: italic; color: var(--ink-soft); font-size: .95rem; }
.pub__links { font-size: .85rem; margin-top: .25rem; display: flex; gap: .9rem; flex-wrap: wrap; align-items: center; }
.pub__type { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 650; color: var(--ink-muted); }

/* ---------- two-column research layout ---------- */
.cols { display: grid; gap: 2rem; grid-template-columns: 1fr; margin-bottom: 2rem; }
@media (min-width: 56rem) { .cols { grid-template-columns: 1fr 1fr; } }
.col { border-top: 4px solid var(--line); padding-top: 1rem; }
.col--plus { border-color: var(--plus); }
.col--fhs { border-color: var(--fhs-mark); }
.col h2 { margin-top: .25rem; }
.topic { margin: 1.25rem 0; }
.topic h3 { margin: 0 0 .3rem; font-size: 1.08rem; }
.topic p { color: var(--ink-soft); margin: 0; font-size: .97rem; }

.callout { border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: var(--radius); padding: 1.25rem 1.5rem; background: var(--bg-soft); margin: 2rem 0; max-width: 46rem; }
.callout p:last-child { margin: 0; }

.addr { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); margin: 1.5rem 0 2rem; }
.addr .card { border-top: 4px solid var(--line); }
.addr .card--plus { border-top-color: var(--plus); }
.addr .card--fhs { border-top-color: var(--fhs-mark); }

/* ---------- strategic partners ---------- */
.sp { padding: 1.75rem 0; }
.sp__title { font-family: var(--font-head); font-weight: 700; color: var(--accent); font-size: 1.1rem; margin-bottom: 1rem !important; }
.sp__logos { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 1rem 2.5rem; align-items: center; }
.sp__logos a { display: block; line-height: 0; background: #fff; border-radius: 6px; padding: .5rem .75rem; }
.sp__logos img { height: 36px; width: auto; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-soft); margin-top: 3rem; font-size: .93rem; }
.site-footer p { margin: 0 0 .4rem; }
.units { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); padding-top: 2rem; padding-bottom: 2rem; position: relative; }
.unit { display: flex; flex-direction: column; gap: .3rem; text-decoration: none; color: var(--ink); padding-left: 1rem; border-left: 4px solid var(--line); }
.unit:hover { color: var(--ink); }
.unit--plus { border-left-color: var(--plus); }
.unit--fhs { border-left-color: var(--fhs-mark); }
.unit__name { font-family: var(--font-head); font-weight: 700; font-size: 1.08rem; }
.unit__inst { font-size: .85rem; color: var(--ink-muted); }
.site-footer__grid { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); padding-top: 2rem; padding-bottom: 1rem; position: relative; }
.site-footer__title { font-weight: 650; text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; color: var(--ink-muted); margin-bottom: .6rem !important; }
.site-footer__base { padding-top: 1rem; padding-bottom: 1.5rem; color: var(--ink-muted); font-size: .85rem; position: relative; }
.units::after, .site-footer__grid::after, .site-footer__base::before { content: ""; position: absolute; left: 1rem; right: 1rem; border-top: 1px solid var(--line); }
.units::after, .site-footer__grid::after { bottom: 0; }
.site-footer__base::before { top: 0; }
@media (min-width: 48rem) { .units::after, .site-footer__grid::after, .site-footer__base::before { left: 2rem; right: 2rem; } }

/* BibTeX toggle */
.pub__bib { flex-basis: 100%; }
.pub__bib summary { cursor: pointer; color: var(--accent); width: fit-content; }
.pub__bib pre { margin: .5rem 0 0; padding: .75rem 1rem; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 6px; overflow-x: auto; font: .8rem/1.5 var(--font-mono); white-space: pre; }

/* teaching */
.course-list { list-style: none; padding: 0; margin: 1rem 0 0; }
.course { display: flex; flex-direction: column; gap: .1rem; padding: .75rem 0; border-bottom: 1px solid var(--line); }
.course__code { font-family: var(--font-mono); font-size: .78rem; color: var(--ink-muted); }
.course__title { font-weight: 600; }
.course__meta { font-size: .88rem; color: var(--ink-soft); }
.instance__focus { display: block; margin: .2rem 0; }
.project__label { align-self: flex-start; font-size: .72rem; font-weight: 650; letter-spacing: .06em; text-transform: uppercase; color: var(--on-accent); background: var(--accent); border-radius: 4px; padding: .1rem .5rem; }

/* ---------- filter bar (CSS only: radio buttons + :has()) ---------- */
.filters input { position: absolute; opacity: 0; width: 1px; height: 1px; margin: 0; }
.filters label { font-size: .88rem; padding: .35rem .85rem; border-radius: 999px; border: 1px solid var(--line); background: var(--bg); color: var(--ink-soft); cursor: pointer; }
.filters input:checked + label { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.filters input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: 2px; }
/* joint items belong to both institutions, so they also show under each one */
body:has(.filters input[value="plus"]:checked) [data-aff="fhs"],
body:has(.filters input[value="fhs"]:checked) [data-aff="plus"],
body:has(.filters input[value="joint"]:checked) [data-aff="plus"],
body:has(.filters input[value="joint"]:checked) [data-aff="fhs"] { display: none !important; }
/* hide group headings (e.g. years) left without visible items */
body:has(.filters input[value="plus"]:checked) [data-group]:not(:has([data-aff="plus"], [data-aff="joint"])),
body:has(.filters input[value="fhs"]:checked) [data-group]:not(:has([data-aff="fhs"], [data-aff="joint"])),
body:has(.filters input[value="joint"]:checked) [data-group]:not(:has([data-aff="joint"])) { display: none !important; }