/* ============================================================
   CompEM — Comparative Electron Microscopy, HU Berlin
   Single stylesheet. No external resources.
   Type:   Archivo (display + body) · IBM Plex Mono (labels)
   Ground: cool drafting paper, HU-Berlin blue as the single accent
   ============================================================ */

/* ---------- self-hosted fonts ----------------------------------
   Place the woff2 files in assets/fonts/ and remove the comment
   markers around the @font-face blocks below. Until then the
   layout renders with the system grotesque / mono fallbacks
   declared in --f-body and --f-mono.

@font-face{font-family:"Archivo";src:url("../fonts/archivo-400.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo";src:url("../fonts/archivo-500.woff2") format("woff2");
  font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo";src:url("../fonts/archivo-600.woff2") format("woff2");
  font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo";src:url("../fonts/archivo-400-italic.woff2") format("woff2");
  font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url("../fonts/plexmono-400.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url("../fonts/plexmono-600.woff2") format("woff2");
  font-weight:600;font-style:normal;font-display:swap}
---------------------------------------------------------------- */

:root{
  --bg:#eef0f2; --panel:#ffffff; --wash:#e3e7ea;
  --ink:#14181c; --ink2:#454e56; --ink3:#5c666f;
  --line:#c2cad1; --line2:#dee3e8;
  --accent:#00366b; --accent-ink:#ffffff;
  --noteInk:#173f66; --noteBg:#e2eaf3; --noteLine:#00366b;
  --barBg:#14181c;
  --footBg:#14181c; --footInk:#ced5db; --footDim:#8d979f; --footLine:#2f373f;
  --shot:rgba(20,24,28,.06);
  --maxw:1120px;
  --f-body:"Archivo","Helvetica Neue",Helvetica,Arial,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#14171a; --panel:#1b1f23; --wash:#22272c;
    --ink:#edf0f2; --ink2:#b8c1c9; --ink3:#8d979f;
    --line:#39414a; --line2:#272e35;
    --accent:#9cc4ec; --accent-ink:#0d1013;
    --noteInk:#a9cdf0; --noteBg:#1a2431; --noteLine:#3c6c9e;
    --footBg:#0d1013; --footInk:#c3cad1; --footDim:#8d979f; --footLine:#252c33;
    --shot:rgba(0,0,0,.3);
  }
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;
    scroll-behavior:auto !important}
}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--f-body);font-size:16px;line-height:1.58;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-wrap:break-word}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent)}
a:hover{color:var(--ink)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:1px}
h1,h2,h3,h4{text-wrap:balance}
p{text-wrap:pretty}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

/* ---------- skip link ---------- */
.skip{position:absolute;left:12px;top:-64px;z-index:200;
  background:var(--accent);color:var(--accent-ink);text-decoration:none;
  font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  padding:13px 18px;transition:top .15s}
.skip:focus{top:12px;color:var(--accent-ink)}

/* ---------- header / nav ---------- */
.site-header{background:var(--panel);border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:100}
.site-header .inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;min-height:80px;
  display:flex;align-items:center;gap:26px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;
  text-decoration:none;color:inherit;padding:14px 0}
.brand-text{display:flex;flex-direction:column;gap:2px}
.brand-mark{font-size:16px;font-weight:600;letter-spacing:.02em;line-height:1.15;
  color:var(--ink)}
.brand-uni{font-family:var(--f-mono);font-size:11px;color:var(--ink3);
  letter-spacing:.14em;text-transform:uppercase;line-height:1.2}
.nav{margin-left:auto}
.nav ul{display:flex;align-items:center;gap:2px;flex-wrap:wrap;
  list-style:none;margin:0;padding:0}
.nav a{display:flex;align-items:center;min-height:44px;padding:9px 13px;
  font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink2);text-decoration:none;border-bottom:2px solid transparent}
.nav a:hover{color:var(--ink);border-bottom-color:var(--line)}
.nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent)}
.nav a.join{border:1px solid var(--ink);margin-left:10px;padding:9px 18px;
  color:var(--ink);font-weight:600}
.nav a.join:hover{background:var(--ink);color:var(--panel);border-color:var(--ink)}
/* on small screens the nav becomes a popover opened by .menu-btn (no JavaScript);
   browsers without popover support keep the wrapped inline nav */
.menu-btn{display:none}
@supports selector(:popover-open){
  .nav[popover]{display:block;position:static;inset:auto;width:auto;height:auto;
    margin:0 0 0 auto;padding:0;border:0;overflow:visible;background:none;color:inherit}
}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--barBg);border-bottom:1px solid var(--line);
  display:flex;align-items:flex-end;min-height:clamp(320px,46vw,520px)}
.hero-img{position:absolute;inset:0}
.hero-img img{width:100%;height:100%;object-fit:cover}
.hero::after{content:"";position:absolute;inset:0;
  background:linear-gradient(to top,rgba(8,11,14,.93) 0%,rgba(8,11,14,.80) 38%,
    rgba(8,11,14,.50) 72%,rgba(8,11,14,.34) 100%)}
.hero-body{position:relative;z-index:2;width:100%;padding-top:110px;padding-bottom:54px}
.hero .kicker{font-family:var(--f-mono);font-size:13px;letter-spacing:.2em;
  text-transform:uppercase;color:#cfd6dc;margin:0 0 20px}
.hero h1{margin:0;color:#fff;font-size:clamp(30px,4.6vw,56px);line-height:1.06;
  font-weight:600;letter-spacing:-.02em;max-width:19ch}
.hero h1.q{font-size:clamp(24px,3.2vw,40px);font-weight:500;letter-spacing:-.012em;
  max-width:26ch}
.hero--plain{background:var(--wash);min-height:0;border-bottom:1px solid var(--line)}
.hero--plain::after{display:none}
.hero--plain .kicker{color:var(--ink3)}
.hero--plain h1{color:var(--ink)}
.hero--plain .hero-body{padding-top:64px;padding-bottom:48px}

/* ---------- bands ---------- */
.band{padding:78px 0;border-bottom:1px solid var(--line2)}
.band.alt{background:var(--wash)}
.band:last-of-type{border-bottom:0}
.eyebrow{font-family:var(--f-mono);font-size:13px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink2);margin:0 0 24px;display:flex;align-items:center;gap:14px}
.eyebrow::after{content:"";flex:1;height:1px;background:var(--line)}
h2{font-size:clamp(24px,2.8vw,34px);line-height:1.16;margin:0 0 20px;font-weight:600;
  letter-spacing:-.018em}
h2.sub{font-size:22px;margin-bottom:24px}
h2.sub.gap{margin-top:52px}
h3{font-size:19px;margin:0 0 10px;font-weight:600;letter-spacing:-.008em}
.lead{font-size:19.5px;line-height:1.56;color:var(--ink2);margin:0 0 26px}
p{margin:0 0 18px;color:var(--ink2)}
.band p:last-child{margin-bottom:0}
.measure{max-width:68ch}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;min-height:46px;
  border:1px solid var(--ink);background:transparent;color:var(--ink);
  font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  font-weight:600;padding:13px 22px;text-decoration:none;
  transition:background .15s,color .15s}
.btn:hover{background:var(--ink);color:var(--panel)}
.btn::after{content:"\2192";font-family:var(--f-body);font-size:15px;line-height:1}
.btnrow{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}

/* ---------- grids & cards ---------- */
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}
@media(max-width:900px){.grid3{grid-template-columns:1fr}}
@media(max-width:560px){.grid2{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--line);padding:26px 24px 28px;
  display:flex;flex-direction:column;margin:0}
.card .num{font-family:var(--f-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink2);margin-bottom:14px}
.card h3{font-size:17.5px;line-height:1.32;margin-bottom:12px}
.card h3:last-child{margin-bottom:0}
.card p{font-size:14.5px;margin:0;color:var(--ink3)}
.card .thumb{margin:-26px -24px 20px;border-bottom:1px solid var(--line);
  aspect-ratio:4/3;overflow:hidden;background:var(--wash)}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.projects{list-style:none;margin:0;padding:0}
.projects .card i{font-style:italic}
/* cards with image: image beside the text on tablets */
@media(min-width:561px) and (max-width:900px){
  .card--media{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);
    grid-template-rows:auto auto 1fr;column-gap:24px;min-height:220px}
  .card--media .thumb{grid-row:1/-1;grid-column:1;margin:-26px 0 -28px -24px;
    aspect-ratio:auto;border-bottom:0;border-right:1px solid var(--line)}
  .card--media > :not(.thumb){grid-column:2}
}

/* ---------- figures ---------- */
.figgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}
@media(max-width:560px){.figgrid{grid-template-columns:1fr}}
.figgrid figure{margin:0}
.figgrid img{width:100%;aspect-ratio:4/3;object-fit:cover;border:1px solid var(--line)}
/* text with a figure beside it */
.split{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);column-gap:56px;
  grid-template-areas:"head fig" "text fig" "cta fig";grid-template-rows:auto auto 1fr;
  align-items:start}
.split > h2{grid-area:head}
.split > p.measure{grid-area:text}
.split > .btnrow{grid-area:cta}
.split > figure{grid-area:fig;margin:6px 0 0}
.split img{width:100%;aspect-ratio:4/3;object-fit:cover;border:1px solid var(--line);
  background:#000}
@media(max-width:820px){
  .split{grid-template-columns:minmax(0,1fr);
    grid-template-areas:"head" "text" "fig" "cta"}
  .split > figure{margin:12px 0 0;max-width:560px}
}
figcaption{font-family:var(--f-mono);font-size:11px;line-height:1.5;letter-spacing:.06em;
  color:var(--ink3);margin-top:10px}

/* ---------- team ---------- */
.people{display:flex;flex-wrap:wrap;gap:44px 32px;margin:34px 0 0;padding:0;list-style:none}
.person{width:172px;text-align:center}
.person--lead{width:220px}
.person img,.person .monogram{width:152px;height:152px;border-radius:50%;
  margin:0 auto 16px;border:1px solid var(--line);background:var(--wash);object-fit:cover}
.person--lead img,.person--lead .monogram{width:200px;height:200px;border-width:2px;
  border-color:var(--ink3)}
.monogram{display:flex;align-items:center;justify-content:center;
  font-family:var(--f-mono);font-size:30px;letter-spacing:.06em;color:var(--ink3);
  border-style:solid}
.person--lead .monogram{font-size:38px}
.person .nm{font-weight:600;font-size:15.5px;line-height:1.3}
.person .rl{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.11em;
  text-transform:uppercase;color:var(--ink3);margin-top:7px}
@media(max-width:560px){
  .people{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:30px 16px}
  .people .person{width:auto}
}
.courses{margin-top:46px;border-top:1px solid var(--line2);padding-top:26px}
.courses ul{margin:0;padding-left:20px;font-size:15px;color:var(--ink2)}
.courses li{margin-bottom:9px}
.courses li:last-child{margin-bottom:0}

/* ---------- tiles ---------- */
.tiles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
@media(max-width:760px){.tiles{grid-template-columns:1fr}}
.tile{border:1px solid var(--line);background:var(--panel);padding:24px;margin:0}
.tile h3{margin-bottom:9px}
.tile p{font-size:14.5px;margin:0}
.tile--contact p{font-size:17px;font-weight:600}
.tile--contact a{text-decoration:none;border-bottom:1px solid currentColor;
  padding-bottom:2px;word-break:break-word}

/* ---------- publications ---------- */
.pubsec{font-size:21px;margin:0 0 14px;font-weight:600}
.pubsec + .years{margin-bottom:56px}
.years{border-top:1px solid var(--line)}
.yearblock{border-bottom:1px solid var(--line)}
.yearblock > summary{display:flex;align-items:center;gap:14px;
  min-height:52px;padding:14px 4px;cursor:pointer;color:var(--ink);
  list-style:none;font-family:var(--f-mono)}
.yearblock > summary::-webkit-details-marker{display:none}
.yearblock > summary:hover{color:var(--accent)}
.yearblock .y{font-size:15px;letter-spacing:.14em;font-weight:600;
  font-variant-numeric:tabular-nums}
.yearblock .c{font-size:11px;letter-spacing:.1em;color:var(--ink3);
  border:1px solid var(--line);padding:3px 9px;border-radius:999px}
.yearblock .chev{margin-left:auto;margin-right:6px;width:9px;height:9px;
  border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;
  transform:translateY(-3px) rotate(45deg);transition:transform .18s}
.yearblock[open] .chev{transform:translateY(2px) rotate(-135deg)}
.publist{list-style:none;margin:0;padding:0 0 14px}
.publist li{font-size:15px;line-height:1.62;color:var(--ink2);padding:13px 0;
  border-top:1px solid var(--line2);overflow-wrap:anywhere}
.publist li i{font-style:italic}
.publink{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent);text-decoration:none;border-bottom:1px solid currentColor;
  padding-bottom:1px;white-space:nowrap;position:relative}
.publink::after{content:"";position:absolute;inset:-9px -8px}
.publink:hover{color:var(--ink)}
.nolink{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink3)}

/* ---------- legal ---------- */
.legal{max-width:76ch}
.legal h2{font-size:26px;margin:8px 0 4px;scroll-margin-top:110px}
.legal .lsub{font-family:var(--f-mono);font-size:12.5px;letter-spacing:.13em;
  text-transform:uppercase;color:var(--ink2);margin:0 0 30px}
.legal h3{font-size:15px;margin:30px 0 8px;letter-spacing:0}
.legal p{font-size:15px;line-height:1.7;margin:0 0 12px}
.legal ul{margin:0 0 14px;padding-left:20px;font-size:15px;line-height:1.7;color:var(--ink2)}
.legal li{margin-bottom:5px}
.legal .lrule{border:0;border-top:1px solid var(--line);margin:56px 0 44px}
.legal .lstand{margin-top:34px;font-family:var(--f-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink3)}
.legal mark{background:var(--noteBg);color:var(--noteInk);padding:2px 6px;
  border-bottom:1px solid var(--noteLine);font-size:.94em}
.langswitch{font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;margin:0 0 26px}

/* ---------- footer ---------- */
.site-footer{background:var(--footBg);color:var(--footInk);padding:60px 0 34px;font-size:13.5px}
.site-footer .cols{display:grid;grid-template-columns:1.2fr 1fr 1fr auto;gap:44px;
  align-items:start}
@media(max-width:860px){.site-footer .cols{grid-template-columns:1fr 1fr;gap:32px}}
@media(max-width:520px){.site-footer .cols{grid-template-columns:1fr}}
.site-footer h2{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--footDim);margin:0 0 14px;font-weight:600}
.site-footer p{color:var(--footInk);margin:0;line-height:1.75;font-size:13.5px}
.site-footer address{font-style:normal;color:var(--footInk);line-height:1.75}
.site-footer ul{list-style:none;margin:0;padding:0;line-height:1.9}
.site-footer a{color:var(--footInk);text-decoration:none;
  border-bottom:1px solid rgba(255,255,255,.22)}
.site-footer a:hover{color:#fff;border-bottom-color:#fff}
.site-footer .seal{justify-self:end;text-align:right}
.seal-mark{display:flex;flex-direction:column;gap:2px;margin:0;
  padding:14px 0 14px 22px;border-left:1px solid var(--footLine);
  font-family:var(--f-mono);font-size:12px;line-height:1.35;letter-spacing:.13em;
  text-transform:uppercase;color:var(--footInk);text-align:left}
.seal-mark span:last-child{color:var(--footDim)}
@media(max-width:860px){
  .site-footer .seal{justify-self:start}
  .seal-mark{padding:0;border-left:0}
}
.site-footer .bottom{margin-top:46px;padding-top:20px;border-top:1px solid var(--footLine);
  display:flex;justify-content:space-between;gap:16px 26px;flex-wrap:wrap;
  font-family:var(--f-mono);font-size:11.5px;letter-spacing:.08em;color:var(--footDim)}
.site-footer .bottom a{color:var(--footDim);border-bottom-color:rgba(255,255,255,.18)}
.site-footer .bottom ul{display:flex;gap:18px;flex-wrap:wrap;line-height:1.6}

/* ---------- small screens ---------- */
@media(max-width:880px){
  .site-header{position:static}
  .site-header .inner{padding:10px 18px;gap:6px;min-height:0}
  .brand{padding:8px 0;gap:10px}
  .nav{margin-left:0;width:100%;border-top:1px solid var(--line2);padding-top:2px}
  .nav ul{gap:0}
  .nav a{padding:9px 11px}
  .nav a.join{margin-left:8px;padding:9px 15px}
  .wrap{padding:0 18px}
  .band{padding:54px 0}
  .hero-body{padding-top:56px;padding-bottom:38px}
  .people{gap:34px 24px}
  .person,.person--lead{width:140px}
  .person img,.person .monogram,
  .person--lead img,.person--lead .monogram{width:124px;height:124px}
  .person--lead .monogram,.monogram{font-size:26px}
}
@media(max-width:880px){
  @supports selector(:popover-open){
    .site-header{position:sticky}
    .site-header .inner{height:64px;padding:0 18px;gap:12px;flex-wrap:nowrap}
    .brand{padding:0}
    .brand-uni{white-space:nowrap}
    .menu-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;
      margin-left:auto;min-width:44px;min-height:44px;padding:0 14px;cursor:pointer;
      border:1px solid var(--ink);border-radius:0;background:transparent;color:var(--ink);
      font-family:var(--f-mono);font-size:11px;font-weight:600;letter-spacing:.12em;
      text-transform:uppercase}
    .menu-icon{position:relative;width:16px;height:1.5px;background:currentColor}
    .menu-icon::before,.menu-icon::after{content:"";position:absolute;left:0;width:16px;
      height:1.5px;background:currentColor;transition:transform .15s}
    .menu-icon::before{top:-5px}
    .menu-icon::after{top:5px}
    .site-header:has(.nav:popover-open) .menu-icon{background:transparent}
    .site-header:has(.nav:popover-open) .menu-icon::before{transform:translateY(5px) rotate(45deg)}
    .site-header:has(.nav:popover-open) .menu-icon::after{transform:translateY(-5px) rotate(-45deg)}
    .nav[popover]:not(:popover-open){display:none}
    .nav[popover]{position:fixed;inset:65px 0 auto;width:auto;height:auto;margin:0;
      max-height:calc(100vh - 65px);max-height:calc(100dvh - 65px);overflow:auto;
      padding:6px 18px 24px;border:0;border-bottom:1px solid var(--line);
      background:var(--panel);color:var(--ink);box-shadow:0 24px 40px -16px rgba(8,11,14,.4)}
    .nav[popover]::backdrop{top:65px;background:rgba(8,11,14,.3)}
    .nav ul{flex-direction:column;align-items:stretch;gap:0}
    .nav a{min-height:52px;padding:0 2px;font-size:13px;border-bottom:1px solid var(--line2)}
    .nav a:hover{border-bottom-color:var(--line2)}
    .nav a[aria-current="page"]{padding-left:14px;font-weight:600;
      border-bottom-color:var(--line2);box-shadow:inset 3px 0 0 var(--accent)}
    .nav a.join{justify-content:center;margin:20px 0 0;padding:0 18px;
      border:1px solid var(--ink)}
    .nav a.join[aria-current="page"]{padding-left:18px;box-shadow:none;
      background:var(--ink);color:var(--panel)}
  }
}
@media(max-width:420px){
  @supports selector(:popover-open){
    .menu-btn{width:44px;padding:0}
    .menu-label{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;
      clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}
  }
}
@media(max-width:360px){
  .brand-uni{font-size:10px;letter-spacing:.1em}
}

/* ---------- print ---------- */
@media print{
  .site-header,.skip,.btnrow,.hero-img,.hero::after{display:none}
  body{background:#fff;color:#000;font-size:11pt}
  .hero{min-height:0;background:#fff}
  .hero h1,.hero .kicker{color:#000}
  .publist{display:block}
  .yearblock .chev{display:none}
}