/* Jan Vonk — site styles */

:root{
  /* colours */
  --bg:#ffffff;
  --paper:#faf7f0;
  --ink:#22251f;
  --muted:#62665b;
  --line:#e7e3d8;
  --accent:#55694b;

  /* fonts */
  --font-sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-serif:"Newsreader",Georgia,serif;

  /* layout */
  --wide:980px;

  /* banner (inner pages) */
  --banner-h:clamp(120px,16vw,190px);
  --banner-pos:52%;
}

body.home{
  --banner-h:clamp(140px,20vw,240px);
  --banner-pos:56%;
}

/* Base */
*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:110px;}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none;}
a:hover{color:var(--ink);text-decoration:none;}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{
  outline:3px solid var(--accent);outline-offset:4px;border-radius:2px;
}
main:focus{outline:none;}
main,[id]{scroll-margin-top:110px;}
.skip-link{position:fixed;top:8px;left:16px;z-index:100;padding:10px 16px;
  background:#fff;border:2px solid var(--accent);transform:translateY(-180%);}
.skip-link:focus{transform:translateY(0);}
img{max-width:100%;}
p{color:#3a3d35;margin:0 0 16px;}
p:last-child{margin-bottom:0;}

/* Top navigation */
header.topbar{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{
  max-width:var(--wide);margin:0 auto;padding:14px 24px;
  display:flex;align-items:baseline;justify-content:space-between;gap:18px;flex-wrap:wrap;
}
.brand{font-family:var(--font-serif);font-size:19px;font-weight:500;color:var(--ink);letter-spacing:.2px;}
.brand:hover{text-decoration:none;}
.nav-links{display:flex;gap:24px;flex-wrap:wrap;}
.nav-links a{color:var(--muted);font-size:14.5px;font-weight:500;}
.nav-links a:hover{color:var(--ink);text-decoration:none;}
.nav-links a[aria-current="page"]{color:var(--ink);}

/* Banner */
.banner-wrap{position:relative;width:100%;}
.banner-img{width:100%;height:var(--banner-h);overflow:hidden;background:#eef0e4;}
.banner-img picture{display:block;width:100%;height:100%;}
.banner-img img.banner{width:100%;height:100%;object-fit:cover;object-position:center var(--banner-pos);display:block;}

/* Main column + shared sections */
main{max-width:var(--wide);margin:0 auto;padding:0 24px 10px;}
main>*{min-width:0;}
main a{overflow-wrap:anywhere;}

section{padding:34px 0;border-top:1px solid var(--line);}
section h2{font-family:var(--font-serif);font-weight:500;font-size:24px;letter-spacing:-.2px;margin:0 0 8px;}
section .sub{color:var(--muted);font-size:14.5px;margin:0 0 14px;max-width:74ch;}

/* Page heading (inner pages) */
.page-head{padding:30px 0 4px;}
.page-head h1{font-family:var(--font-serif);font-weight:500;font-size:34px;letter-spacing:-.3px;margin:0 0 8px;}
.page-head .intro{font-size:16px;color:#3a3d35;max-width:72ch;margin:0;}

/* Home: photo card + about + contact */
.layout{
  margin:0 auto;padding:0 0 4px;
  display:grid;grid-template-columns:250px 1fr;gap:46px;align-items:start;
}
.side{text-align:center;}
.side .avatar{
  display:block;width:198px;height:198px;border-radius:50%;
  border:5px solid #fff;box-shadow:0 6px 22px rgba(40,45,30,.18);
  object-fit:cover;object-position:center 28%;background:#fff;
  margin:-80px auto 0;position:relative;z-index:3;
}
.side h1{font-family:var(--font-serif);font-weight:500;font-size:30px;line-height:1.12;letter-spacing:-.3px;margin:18px 0 5px;}
.side .dept{color:var(--muted);font-size:14.5px;line-height:1.5;margin:0 0 16px;}
.about{padding-top:40px;}
.about .lede{font-size:15px;line-height:1.55;color:var(--ink);margin:0;}

.info{
  display:grid;grid-template-columns:1fr 1fr;gap:25px;
  background:var(--paper);border:1px solid var(--line);border-radius:10px;
  padding:26px 28px;
}
.info h2{font-family:var(--font-sans);font-size:11.5px;text-transform:uppercase;letter-spacing:1.3px;color:var(--muted);font-weight:600;margin:0 0 8px;}
.info .email-heading{margin-top:16px;}
.contact-section{border-top:0;}
.info p{margin:0;font-size:14.5px;line-height:1.55;color:var(--ink);}
.info .sub{color:var(--muted);max-width:none;font-size:14.5px;margin:0;}

/* Lists — publications, expository, code, conferences, outreach */
ul.list{list-style:none;margin:0;padding:0;}
ul.list>li{padding:10px 0;}
.au{color:var(--muted);font-size:13px;margin:0 0 1px;}
.ti{font-weight:600;font-size:13px;color:var(--ink);margin:0 0 1px;line-height:1.4;}
.ve{font-size:13px;color:#3a3d35;margin:0;}
.ve .lk{font-weight:500;}
.meta{font-style:italic;color:var(--muted);font-size:12px;margin:2px 0 6px;}
.desc{font-size:14px;color:#3a3d35;margin:0;max-width:84ch;}
ol.inner{margin:5px 0 0;padding-left:20px;font-size:12px;color:#3a3d35;}
ol.inner li{margin:2px 0;}
.inner + .desc{margin-top:8px;}

/* External-profile row with icons */
.profrow{display:flex;gap:26px;flex-wrap:wrap;margin:4px 0 0;}
.profrow a{display:flex;align-items:center;gap:9px;font-weight:500;font-size:12px;color:var(--ink);}
.profrow a:hover{color:var(--accent);text-decoration:none;}
.profrow a img{width:20px;height:20px;object-fit:contain;border-radius:3px;background:#fff;}
.inline-ic{width:18px;height:18px;object-fit:contain;border-radius:3px;vertical-align:-4px;margin:0 2px;}

/* People lists — students & teaching */
ol.people{list-style:none;margin:0;padding:0;counter-reset:i;}
ol.people>li{position:relative;padding:9px 0 9px 32px;counter-increment:i;
  display:flex;flex-wrap:wrap;align-items:baseline;}
ol.people>li:before{content:counter(i) ".";position:absolute;left:0;top:9px;color:var(--muted);font-size:14px;font-variant-numeric:tabular-nums;}
.nm{font-weight:600;}
.when{color:var(--muted);font-style:italic;font-size:12px;margin-left:auto;padding-left:16px;}
.note{font-size:12px;color:#3a3d35;margin:3px 0 0;flex-basis:100%;}
.note em{font-style:italic;}

ul.plain{list-style:none;margin:0;padding:0;}
ul.plain>li{padding:8px 0;display:flex;flex-wrap:wrap;align-items:baseline;}
ul.plain .ti{font-weight:600;}
.preuni{font-size:12px;color:#3a3d35;}
.preuni-list{margin:10px 0 0;padding-left:18px;font-size:14.5px;color:#3a3d35;}
.teaching-intro{color:var(--muted);font-size:14.5px;margin:0 0 12px;}

/* Other page: title left, place/date right, blurb below */
body.other ul.list>li{display:flex;flex-wrap:wrap;align-items:baseline;}
body.other ul.list>li .ti{margin:0;}
body.other ul.list>li .meta{margin:0 0 0 auto;padding-left:16px;}
body.other ul.list>li .desc{flex-basis:100%;margin-top:5px;}

/* Small screens */
@media (max-width:720px){
  .layout{grid-template-columns:1fr;gap:22px;text-align:center;justify-items:center;}
  .side .avatar{margin:-92px auto 0;}
  .about{text-align:left;width:100%;padding-top:28px;}
  .info{grid-template-columns:1fr;gap:18px;width:auto;}
  .page-head h1{font-size:28px;}
}

/* Invited talks list (event, location, country, date in aligned columns) */
ul.talks{display:grid;grid-template-columns:minmax(0,2.2fr) minmax(0,1.4fr) 3.2em max-content;
  column-gap:16px;margin:0;padding:0;list-style:none;align-items:baseline;}
ul.talks>li{display:contents;}
.talks .ev{color:#3a3d35;font-size:14px;padding:3px 0;}
.talks .loc{color:var(--muted);font-size:13.5px;padding:3px 0;}
.talks .cc{color:var(--accent);font-size:11px;font-weight:600;letter-spacing:.6px;
  font-variant-numeric:tabular-nums;padding:3px 0;white-space:nowrap;}
.talks .when{color:var(--muted);font-style:italic;font-size:12.5px;padding:3px 0;white-space:nowrap;text-align:right;}
@media (max-width:620px){
  ul.talks{display:block;}
  ul.talks>li{display:block;padding:7px 0;border-top:1px solid var(--line);}
  ul.talks>li:first-child{border-top:0;}
  .talks .ev{display:block;padding:0;}
  .talks .loc{padding:0;}
  .talks .cc{display:inline;padding:0 0 0 8px;}
  .talks .when{display:inline;text-align:left;padding:0 0 0 8px;}
}

/* Outreach cards */
.outreach{max-width:760px;margin:0 auto;border-top:0;}
.ocard{display:flex;gap:24px;align-items:flex-start;padding:36px 0;border-top:1px solid var(--line);}
.ocard:first-child{border-top:0;}
.ocard .thumb{flex:0 0 186px;width:186px;height:141px;border-radius:8px;background:#eef1e6;
  display:flex;align-items:center;justify-content:center;overflow:hidden;}
.ocard .thumb img{width:100%;height:100%;object-fit:cover;}
.ocard .thumb picture{display:block;width:100%;height:100%;}
.ocard .obody{flex:1;min-width:0;}
.ocard .obody .ti{margin:0 0 2px;}
@media (max-width:560px){
  .ocard{flex-direction:column;gap:18px;}
  .ocard .thumb{width:min(100%,300px);height:auto;aspect-ratio:15/11;flex-basis:auto;align-self:center;}
}

/* Navigation is visible by default; JavaScript enables the mobile disclosure. */
.nav-toggle{display:none;border:0;background:none;cursor:pointer;color:var(--ink);padding:10px;min-width:44px;min-height:44px;margin:-6px -6px -6px 0;}
.nav-toggle svg{display:block;}
@media (max-width:720px){
  .nav{position:relative;}
  .nav-links{width:100%;gap:6px 20px;}
  .nav-links a{padding:8px 0;}
  .nav-enhanced .nav-toggle{display:inline-flex;align-self:center;}
  .nav-enhanced .nav-links{
    position:absolute;top:calc(100% + 4px);right:0;
    display:none;flex-direction:column;align-items:flex-end;gap:2px;
    width:max-content;min-width:150px;max-width:80vw;
    background:#fff;border:1px solid var(--line);border-radius:10px;
    box-shadow:0 12px 30px rgba(40,45,30,.16);padding:10px 16px;z-index:40;
  }
  .nav-enhanced .nav-links.open{display:flex;}
  .nav-enhanced .nav-links a{padding:10px 0;font-size:15.5px;text-align:right;}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;}}
@media print{
  header.topbar,.banner-wrap,.skip-link,.nav-toggle{display:none;}
  .side .avatar{margin:16px auto;box-shadow:none;}
  body{color:#000;}
  main{max-width:none;}
  a{color:inherit;}
  section h2{break-after:avoid;}
  .ocard,ol.people>li,ul.list>li{break-inside:avoid;}
}