/* Amsterdam Strontium Lab — site style (design "A · Institute").
   Colours follow the UvA Institute of Physics group sites. */
:root{
  --teal:#144154; --teal2:#1f5a72; --ice:#dbeaf0; --green:#63a37b; --green-d:#4f8a65;
  --text:#2b2f33; --muted:#5d6670; --line:#e3e8eb; --bg:#fff; --soft:#f4f7f8;
  --w:1180px;
}
*{box-sizing:border-box}
html{scroll-padding-top:90px}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 Roboto,system-ui,sans-serif;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--teal2)}
a:hover{color:var(--green-d)}
.wrap{max-width:var(--w);margin:0 auto;padding:0 24px}
.narrow{max-width:820px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;background:#fff;padding:8px;z-index:99}
h1,h2,h3,h4{color:var(--teal);line-height:1.2}
h1,h2{font-family:"Roboto Condensed",Roboto,sans-serif;text-transform:uppercase;letter-spacing:.02em}
sup,sub{line-height:0}

/* --- header --------------------------------------------------------------- */
.topbar{background:var(--teal);color:#cfe0e8;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;gap:16px;padding-block:7px}
.topbar a{color:#cfe0e8;text-decoration:none}.topbar a:hover{color:#fff}
.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:20}
.header-row{display:flex;align-items:center;justify-content:space-between;padding-block:14px;gap:20px}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none}
.el{flex:none;width:46px;height:46px;background:var(--teal);color:#fff;border-radius:4px;display:grid;place-items:center;position:relative;font:700 20px "Roboto Condensed",sans-serif}
.el i{position:absolute;top:2px;left:5px;font:400 9px Roboto,sans-serif;font-style:normal;opacity:.8}
.brand-name{display:block;font:700 20px/1.1 "Roboto Condensed",sans-serif;color:var(--teal);text-transform:uppercase;letter-spacing:.01em}
.brand-tag{display:block;font-size:13px;color:var(--muted)}
.site-nav ul{display:flex;gap:22px;list-style:none;margin:0;padding:0}
.site-nav a{font:500 14px "Roboto Condensed",sans-serif;text-transform:uppercase;letter-spacing:.06em;color:var(--teal);text-decoration:none;padding-bottom:4px;border-bottom:3px solid transparent}
.site-nav a:hover,.site-nav a.on{border-bottom-color:var(--green)}
.nav-toggle{display:none;background:none;border:0;padding:8px;cursor:pointer}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--teal);margin:5px 0}

/* --- buttons ---------------------------------------------------------------- */
.btn{display:inline-block;padding:12px 26px;background:var(--green);color:#fff;font:700 14px "Roboto Condensed",sans-serif;text-transform:uppercase;letter-spacing:.08em;border-radius:2px;text-decoration:none;border:2px solid var(--green)}
.btn:hover{background:var(--green-d);border-color:var(--green-d);color:#fff}
.btn.ghost{background:transparent;border-color:#fff;color:#fff}
.btn.ghost:hover{background:#fff;color:var(--teal)}
.btn.line{background:transparent;border-color:var(--teal);color:var(--teal)}
.btn.line:hover{background:var(--teal);color:#fff}
.more{font:700 14px "Roboto Condensed",sans-serif;text-transform:uppercase;letter-spacing:.06em;text-decoration:none}

/* --- hero ---------------------------------------------------------------------- */
.hero{position:relative;min-height:520px;background:var(--teal) center 35%/cover no-repeat}
.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#144154f0 0%,#144154b8 42%,#14415410 78%)}
.hero .wrap{position:relative;min-height:520px;display:flex;flex-direction:column;justify-content:center;color:#fff;padding-block:60px}
.hero h1{color:#fff;font-size:clamp(34px,4.6vw,56px);line-height:1.08;max-width:17ch;margin:0}
.hero p{font-size:19px;font-weight:300;max-width:48ch;margin:18px 0 28px;color:#e3eef3}
.hero .btns{display:flex;gap:12px;flex-wrap:wrap}
.page-hero{position:relative;background:var(--teal) center/cover no-repeat;color:#fff}
.page-hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#144154f2 0%,#144154c0 50%,#14415430 100%)}
.page-hero .wrap{position:relative;padding-block:70px 56px}
.page-hero.plain{background:var(--teal)}
.page-hero h1{color:#fff;font-size:clamp(30px,4vw,48px);margin:6px 0 10px}
.page-hero p{margin:0;max-width:60ch;font-size:18px;font-weight:300;color:#e3eef3}
.crumb{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:#bcd3dd}
.crumb a{color:#bcd3dd;text-decoration:none}.crumb a:hover{color:#fff}

/* --- sections ------------------------------------------------------------------- */
section{padding:72px 0}
.grey{background:var(--soft)}
.h2{font-size:30px;margin:0 0 8px}
.h2:after{content:"";display:block;width:56px;height:4px;background:var(--green);margin-top:12px}
.lead{font-size:18px;color:var(--muted);max-width:70ch}
.intro{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.intro p{color:var(--muted)}
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.fact{background:var(--ice);padding:20px;border-radius:2px}
.fact b{display:block;font:700 34px "Roboto Condensed",sans-serif;color:var(--teal)}
.fact span{font-size:14px;color:var(--teal2)}

/* cards */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:36px}
.cards.c3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);display:flex;flex-direction:column;text-decoration:none;color:inherit;transition:box-shadow .2s,transform .2s}
a.card:hover{box-shadow:0 8px 24px #14415422;transform:translateY(-2px);color:inherit}
.card img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block;background:#0b1720}
.card .in{padding:20px;display:flex;flex-direction:column;flex:1}
.card h3{font:700 18px "Roboto Condensed",sans-serif;text-transform:uppercase;color:var(--teal);margin:0 0 8px}
.card p{font-size:14.5px;color:var(--muted);margin:0;flex:1}
.card ul{list-style:none;padding:10px 0 0;margin:14px 0 0;border-top:1px solid var(--line);font-size:14px}
.card li{padding:3px 0}
.card li a{text-decoration:none}
.card li:before{content:"›";color:var(--green);font-weight:700;margin-right:8px}
.card .meta{font-size:13px;color:var(--teal2);margin-top:12px}
.tag{display:inline-block;font:700 11px "Roboto Condensed",sans-serif;text-transform:uppercase;letter-spacing:.08em;background:var(--ice);color:var(--teal);padding:3px 8px;border-radius:2px;margin-bottom:8px;align-self:flex-start}
.tag.paused{background:#fff1d6;color:#7a5600}
.tag.previous{background:#eceff1;color:#555}

/* mosaic */
.mosaic{display:grid;grid-template-columns:2fr 1fr 1fr;grid-auto-rows:220px;gap:10px;margin-top:36px}
.mosaic img{width:100%;height:100%;object-fit:cover;display:block}
.mosaic img:first-child{grid-row:span 2}

/* news + jobs */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px}
.newslist article{display:grid;grid-template-columns:130px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}
.newslist img{width:130px;height:90px;object-fit:cover;display:block}
.newslist .noimg{width:130px;height:90px;background:var(--ice);display:grid;place-items:center;color:var(--teal);font:700 22px "Roboto Condensed"}
.newslist h3{font:500 17px/1.3 Roboto,sans-serif;margin:0 0 4px}
.newslist h3 a{color:var(--teal);text-decoration:none}
.newslist time,.date{font-size:13px;color:var(--green-d);font-weight:500}
.jobs{background:var(--teal);color:#e3eef3;padding:34px}
.jobs .h2{color:#fff}
.jobs ul{padding:0;margin:20px 0 26px;list-style:none}
.jobs li{padding:9px 0;border-bottom:1px solid #ffffff22}
.jobs a{color:#fff}

/* people */
.pis{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:36px}
.pi{border-top:4px solid var(--teal);background:var(--soft);padding:22px}
.pi img{width:96px;height:96px;border-radius:50%;object-fit:cover;object-position:center 20%;display:block;margin-bottom:14px;border:3px solid #fff;box-shadow:0 0 0 1px var(--line)}
.pi b{display:block;color:var(--teal)}
.pi span{display:block;font-size:14px;color:var(--muted)}
.pi a{font-size:14px}
.people{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:20px;margin-top:20px}
.person{text-align:center}
.person img,.person .ph{width:120px;height:120px;border-radius:50%;object-fit:cover;object-position:center 20%;display:block;margin:0 auto 10px;background:var(--ice)}
.person .ph{display:grid;place-items:center;font:700 30px "Roboto Condensed";color:var(--teal)}
.person b{display:block;color:var(--teal);line-height:1.3}
.person span{display:block;font-size:13.5px;color:var(--muted)}
.person a{font-size:13px}
.groupphoto{width:100%;display:block;margin-top:28px}

/* tables */
table.list{width:100%;border-collapse:collapse;margin-top:20px;font-size:15px}
table.list th{text-align:left;font:700 13px "Roboto Condensed";text-transform:uppercase;letter-spacing:.06em;color:var(--teal);border-bottom:2px solid var(--teal);padding:8px 10px}
table.list td{border-bottom:1px solid var(--line);padding:9px 10px;vertical-align:top}

/* article / project page */
.article{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:56px;align-items:start}
.prose{font-size:16.5px}
.prose h2{font-size:24px;margin:36px 0 10px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:19px;margin:28px 0 8px}
.prose figure{margin:28px 0}
.prose figure img{display:block;width:100%}
.prose figcaption{font-size:14px;color:var(--muted);margin-top:8px}
.side{position:sticky;top:100px}
.box{background:var(--soft);border-top:4px solid var(--teal);padding:22px;margin-bottom:22px;font-size:14.5px}
.box h3{font:700 15px "Roboto Condensed";text-transform:uppercase;letter-spacing:.06em;margin:0 0 10px}
.box ul{margin:0;padding:0;list-style:none}
.box li{padding:4px 0}
.box img.icon{width:100%;display:block;margin-bottom:16px}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin-top:20px}
.gallery figure{margin:0}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}
.gallery figcaption{font-size:13px;color:var(--muted);padding:6px 2px 0}
.pager{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);margin-top:48px;padding-top:20px}

/* news page */
.newsitem{display:grid;grid-template-columns:260px 1fr;gap:28px;padding:32px 0;border-bottom:1px solid var(--line)}
.newsitem img{width:100%;display:block}
.newsitem h2{font:700 22px/1.25 "Roboto Condensed";text-transform:none;letter-spacing:0;margin:2px 0 8px}
.newsitem .body p{margin:0 0 10px}
.newsitem.noimage{grid-template-columns:1fr}
.years{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.years a{padding:4px 10px;border:1px solid var(--line);text-decoration:none;font-size:14px}

/* publications */
.pubfilter{width:100%;max-width:460px;padding:10px 14px;border:1px solid var(--line);font:inherit;margin-top:16px}
.pubs{list-style:none;padding:0;margin:0}
.pubs li{padding:12px 0;border-bottom:1px solid var(--line)}
.pubs .t{font-weight:500;color:var(--teal)}
.pubs .a{color:var(--muted);font-size:14.5px}
.pubs .l a{font-size:13px;margin-right:10px}
.yearhead{font:700 22px "Roboto Condensed";color:var(--teal);margin:34px 0 4px}

/* funding */
.fund{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px;margin-top:28px}
.fund .card .in{padding:22px}
.fund .funder{font-size:13px;color:var(--teal2);margin-bottom:6px}

/* footer */
.site-footer{background:var(--teal);color:#cfe0e8;padding:50px 0 0;font-size:14px}
.footer-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.site-footer h4{font:700 15px "Roboto Condensed";text-transform:uppercase;color:#fff;margin:0 0 10px;letter-spacing:.06em}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{padding:2px 0}
.site-footer a{color:#cfe0e8;text-decoration:none}.site-footer a:hover{color:#fff}
.legal{border-top:1px solid #ffffff22;margin-top:40px;padding:16px 0;font-size:13px;color:#9fbccb}

/* responsive */
@media (max-width:1000px){
  .cards{grid-template-columns:1fr 1fr}
  .cards.c3{grid-template-columns:1fr 1fr}
  .pis{grid-template-columns:1fr 1fr}
  .article{grid-template-columns:1fr}
  .side{position:static}
  .footer-cols{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line)}
  .site-nav.open{display:block}
  .site-nav ul{flex-direction:column;gap:0;padding:8px 24px 16px}
  .site-nav a{display:block;padding:10px 0;border:0}
  .intro,.split{grid-template-columns:1fr;gap:36px}
  .mosaic{grid-template-columns:1fr 1fr;grid-auto-rows:160px}
  .mosaic img:first-child{grid-column:span 2;grid-row:span 1}
  .newsitem{grid-template-columns:1fr}
  .topbar .wrap span:first-child{display:none}
}
@media (max-width:560px){
  .cards,.cards.c3,.pis,.footer-cols{grid-template-columns:1fr}
  .facts{grid-template-columns:1fr 1fr 1fr;gap:8px}
  .fact{padding:14px}.fact b{font-size:26px}
  .hero,.hero .wrap{min-height:440px}
  .brand-name{font-size:17px}.brand-tag{display:none}
  section{padding:52px 0}
  .newslist article{grid-template-columns:90px 1fr}
  .newslist img,.newslist .noimg{width:90px;height:68px}
}
.card h3 a{text-decoration:none}
/* Project names and in-text headings keep their case (kHz, mHz, SrPAL…) */
.card h3,.page-hero h1,.prose h2,.prose h3,.newsitem h2{text-transform:none;letter-spacing:0}
.card h3{font-size:19px}
.page-hero h1{letter-spacing:-.005em}
/* Round 2: portrait rectangles (4:5) instead of circles, so the whole head stays visible */
.pi img{width:120px;height:150px;border-radius:6px;object-position:center 30%}
.people{grid-template-columns:repeat(auto-fill,minmax(170px,1fr))}
.person img,.person .ph{width:144px;height:180px;border-radius:6px;object-position:center 30%}
/* Alumni table with small photos */
table.alumni td.apic{width:52px;padding-right:0}
table.alumni td.apic img,table.alumni td.apic .ph{width:44px;height:55px;border-radius:4px;object-fit:cover;display:block;background:var(--ice)}
table.alumni td.apic .ph{display:grid;place-items:center;font:700 14px "Roboto Condensed";color:var(--teal)}
table.alumni td small{display:block;color:var(--muted);font-size:13px}
/* Funding cards with logos */
.fund .card .logos{display:flex;gap:18px;align-items:center;justify-content:flex-start;min-height:92px;padding:18px 22px 0}
.fund .card .logos img{max-height:56px;max-width:150px;width:auto;height:auto;object-fit:contain}
.fund .card .in{padding-top:14px}
.fund .prog{font-size:13.5px;color:var(--muted);margin:-4px 0 8px}
/* Publication highlights */
.pubhl{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:22px 0 10px}
.pubhl a{display:block;background:#fff;border:1px solid var(--line);text-decoration:none;color:inherit}
.pubhl a:hover{border-color:var(--teal)}
.pubhl img{width:100%;aspect-ratio:16/10;object-fit:cover;display:block;background:#000}
.pubhl b{display:block;padding:10px 12px 2px;color:var(--teal);line-height:1.3}
.pubhl small{display:block;padding:0 12px 12px;color:var(--muted)}
@media (max-width:760px){.pubhl{grid-template-columns:1fr 1fr}}
.fund .card .logos img{background:transparent;aspect-ratio:auto;width:auto;height:auto;max-height:56px;max-width:150px;object-fit:contain;border:0}
table.alumni td:nth-child(4){white-space:nowrap}
/* Papers / Theses tabs */
.tabs{display:flex;gap:6px;border-bottom:2px solid var(--line);margin:0 0 30px}
.tabs a{font:700 14px "Roboto Condensed";text-transform:uppercase;letter-spacing:.06em;color:var(--muted);text-decoration:none;padding:10px 16px;border-bottom:3px solid transparent;margin-bottom:-2px}
.tabs a.on,.tabs a:hover{color:var(--teal);border-bottom-color:var(--teal)}
/* PhD theses with cover thumbnails */
.theses{display:grid;grid-template-columns:1fr 1fr;gap:26px 34px;margin-top:24px}
.thesis{display:grid;grid-template-columns:150px 1fr;gap:18px;align-items:start}
.thesis .cover img{width:150px;height:auto;display:block;box-shadow:0 2px 10px rgba(0,0,0,.18);border:1px solid var(--line);background:#fff}
.thesis .cover a:hover img{box-shadow:0 4px 16px rgba(0,0,0,.28)}
.thesis b{display:block;color:var(--teal);font-size:16px}
.thesis .t{margin:4px 0 6px;line-height:1.4}
.thesis .y{font-size:14px;color:var(--muted)}
.thesis .l{margin-top:6px;font-size:14px}
.thesis .l a{margin-right:10px}
@media (max-width:760px){.theses{grid-template-columns:1fr}.thesis{grid-template-columns:110px 1fr}.thesis .cover img{width:110px}}
/* Nine menu items: tighter header on medium screens, menu button below 960 px */
@media (max-width:1100px){
  .site-nav ul{gap:14px}
  .site-nav a{font-size:13px;letter-spacing:.03em}
  .brand-name{white-space:nowrap}
  .brand-tag{display:none}
}
@media (max-width:960px){
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line)}
  .site-nav.open{display:block}
  .site-nav ul{flex-direction:column;gap:0;padding:8px 24px 16px}
  .site-nav a{display:block;padding:10px 0;border:0;font-size:14px}
}