/* ==========================================================================
   Gustave Kenedi — academic site
   Edit the variables below to restyle the whole page.
   ========================================================================== */

:root{
  /* ---- palette ---- */
  --ink:        #1A4368;   /* headings and titles (deep blue) */
  --body:       #22262e;   /* body copy */
  --muted:      #5c6473;   /* secondary text */
  --faint:      #8a909c;   /* tertiary: dates, coauthors, categories */
  --line:       #e6e6e6;   /* hairlines */
  --bg:         #ffffff;   /* page ground */
  --card:       #ffffff;   /* same as the page now; borders do the separating */
  --title:      #1a1a1a;   /* paper, brief and course titles */
  --accent:     #1F4E79;   /* the one highlight hue — swap this to restyle */
  --accent-lt:  #2E6DA4;   /* lighter blue, for title hover */
  --accent-dk:  #3a4257;

  --maxw: 820px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
}

*{ box-sizing:border-box }
html{ scroll-behavior:smooth }

body{
  margin:0;
  background:var(--bg);
  color:var(--body);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

img{ max-width:100% }

a{ color:var(--accent) }
a:hover{ color:var(--ink) }

.wrap{
  max-width:var(--maxw);
  margin:0 auto;
  padding-left:24px;
  padding-right:24px;
}

.skip-link{
  position:absolute; left:-9999px;
  background:var(--ink); color:#fff;
  padding:10px 16px; border-radius:6px; z-index:100;
}
.skip-link:focus{ left:16px; top:16px }

/* ---------------------------------------------------------------- nav ---- */
nav{
  position:sticky; top:0; z-index:10;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(8px);
  -webkit-backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
  padding-top:env(safe-area-inset-top, 0px);
}
nav .wrap{ display:flex; align-items:center; justify-content:space-between; height:58px; gap:16px }
nav .name{
  font-weight:600; font-size:19px; letter-spacing:.2px;
  color:var(--ink); text-decoration:none; white-space:nowrap;
}
nav .links{ display:flex; gap:24px; flex-wrap:wrap; justify-content:flex-end }
nav .links a{
  color:var(--muted); text-decoration:none; font-size:15px; font-weight:500;
  white-space:nowrap; transition:color .15s ease;
}
nav .links a:hover,
nav .links a.active{ color:var(--accent) }

/* --------------------------------------------------------------- hero ---- */
header.hero{ padding:64px 0 40px }
.hero-grid{ display:grid; grid-template-columns:1fr 180px; gap:40px; align-items:start }

h1{
  font-family:var(--sans);
  font-weight:700; font-size:40px; line-height:1.05;
  letter-spacing:-.022em; color:var(--ink);
  margin:0 0 8px;
}
.role{ color:var(--muted); font-size:18px; margin:0 0 14px; line-height:1.45 }
.role strong{ color:var(--ink); font-weight:600 }
.affil{ color:var(--faint); font-size:15px; margin:0 0 22px; line-height:1.5 }
.email{ margin:0 0 14px; font-size:16px }
.email a{ color:var(--accent); text-decoration:none; border-bottom:1px solid var(--line) }
.email a:hover{ color:var(--ink); border-bottom-color:var(--accent) }
.affil a{ color:var(--faint); text-decoration:none; border-bottom:1px solid var(--line) }
.affil a:hover{ color:var(--accent); border-bottom-color:var(--accent) }

.cta{ display:flex; gap:10px; flex-wrap:wrap }
.btn{
  display:inline-block; padding:9px 16px; border-radius:8px;
  font-size:15px; font-weight:500; text-decoration:none;
  border:1px solid var(--line); color:var(--ink); background:var(--card);
  transition:border-color .15s ease, color .15s ease, background .15s ease;
}
.btn:hover{ border-color:var(--accent); color:var(--accent) }
.btn.primary{ background:var(--ink); color:#fff; border-color:var(--ink) }
.btn.primary:hover{ background:var(--accent); border-color:var(--accent); color:#fff }

.photo{
  width:180px; height:230px; border-radius:12px;
  object-fit:cover; object-position:50% 25%; display:block;
  border:1px solid var(--line); background:var(--card);
}

/* ----------------------------------------------------------- sections ---- */
section{ padding:30px 0; border-top:1px solid var(--line) }

h2{
  font-family:var(--sans);
  font-weight:600; font-size:15px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--accent);
  margin:0 0 22px;
  scroll-margin-top:78px;
}
section{ scroll-margin-top:58px }

p.lede{ font-size:16px; color:var(--muted); margin:0 0 16px }
p.lede:last-child{ margin-bottom:0 }
p.lede strong{ color:var(--ink); font-weight:600 }

.cat{
  font-weight:600; font-size:12px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--faint); margin:26px 0 12px;
}
.cat:first-of-type{ margin-top:0 }

/* --------------------------------------------------------------- news ---- */
.news-item{
  display:grid; grid-template-columns:96px 1fr; gap:16px;
  padding:9px 0; border-top:1px solid var(--line);
}
.news-item:first-of-type{ border-top:none; padding-top:0 }
.news-date{
  font-size:11.5px; font-weight:600; letter-spacing:.07em; text-transform:uppercase;
  color:var(--faint); padding-top:4px; white-space:nowrap;
}
.news-body{ font-size:14.5px; color:var(--muted); line-height:1.5 }
.news-body a{ color:var(--muted); text-decoration:none; border-bottom:1px solid var(--line) }
.news-body a:hover{ color:var(--accent); border-bottom-color:var(--accent) }

/* ------------------------------------------------------------- papers ---- */
.paper{ margin:0 0 15px }
.paper:last-child{ margin-bottom:0 }

.paper .ptitle{
  font-size:16px; font-weight:600; line-height:1.32;
  letter-spacing:-.005em; color:var(--title); margin:0 0 2px;
}
.paper .ptitle a{ color:var(--title); text-decoration:none; transition:color .15s ease }
.paper .ptitle a:hover{ color:var(--accent-lt) }

.newtag{
  display:inline-block; vertical-align:middle; position:relative; top:-1px;
  margin-left:8px; padding:1px 6px; border-radius:4px;
  font-size:10.5px; font-weight:600; letter-spacing:.06em; text-transform:uppercase;
  color:#fff; background:var(--accent);
}

.paper .pline{ font-size:14.5px; color:var(--muted); line-height:1.45; margin:0 }
.paper .pline .jrnl{ color:var(--accent); font-weight:600; font-size:15px }
.paper .pline .auth{ color:var(--faint) }

/* coauthor links: no underline, so a long byline stays calm */
.paper .pline a{ color:var(--muted); text-decoration:none; transition:color .15s ease }
.paper .pline a:hover{ color:var(--accent-lt) }

/* link buttons: PDF, replication package, policy brief, ... */
.plinks{ margin:7px 0 0; display:flex; flex-wrap:wrap; gap:6px }
.plinks a{
  display:inline-block; padding:3px 10px; border-radius:6px;
  font-size:12.5px; font-weight:500; letter-spacing:.01em;
  color:var(--muted); background:var(--card);
  border:1px solid var(--line); text-decoration:none;
  transition:border-color .15s ease, color .15s ease;
}
.plinks a:hover{ border-color:var(--accent); color:var(--accent) }
.plinks .soon{
  display:inline-block; padding:3px 10px; border-radius:6px;
  font-size:12.5px; font-weight:500; letter-spacing:.01em;
  color:var(--faint); background:transparent;
  border:1px dashed var(--line); font-style:italic;
}

/* slide-down abstract */
details.abs{ margin-top:7px }
details.abs summary{
  display:inline-block; cursor:pointer; list-style:none;
  font-size:12.5px; font-weight:500; color:var(--faint);
  padding:3px 10px; border:1px solid var(--line); border-radius:6px;
  background:var(--card);
  transition:border-color .15s ease, color .15s ease;
}
details.abs summary::-webkit-details-marker{ display:none }
details.abs summary::before{ content:"+"; color:var(--accent); font-weight:700; margin-right:6px }
details.abs[open] summary::before{ content:"\2212" }
details.abs summary:hover{ border-color:var(--accent); color:var(--accent) }

details.abs > div{
  overflow:hidden;
  font-family:var(--serif);
  font-size:15px; line-height:1.6; color:var(--muted);
  margin-top:9px; padding-left:14px;
  border-left:2px solid var(--line);
  animation:slide-down .22s ease;
}
@keyframes slide-down{
  from{ opacity:0; transform:translateY(-4px) }
  to  { opacity:1; transform:translateY(0) }
}
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto }
  details.abs > div{ animation:none }
}

/* ----------------------------------------------------------- teaching ---- */
.course{ margin:0 0 18px }
.course:last-child{ margin-bottom:0 }
.ctitle{ font-size:16px; font-weight:600; color:var(--title); margin:0 0 3px; line-height:1.32 }
.cterm{
  display:inline-block; vertical-align:middle; position:relative; top:-1px;
  margin-left:8px; padding:1px 7px; border-radius:4px;
  font-size:10.5px; font-weight:600; letter-spacing:.06em; text-transform:uppercase;
  color:var(--faint); background:rgba(31,78,121,.07);
}
.cline{ font-size:14.5px; color:var(--muted); line-height:1.5; margin:0 }

/* ------------------------------------------------------------- footer ---- */
footer{
  padding:34px 0 calc(60px + env(safe-area-inset-bottom, 0px));
  color:var(--faint); font-size:13px; text-align:center;
  border-top:1px solid var(--line);
}
footer a{ color:var(--faint); text-decoration:none; border-bottom:1px solid var(--line) }
footer a:hover{ color:var(--accent); border-bottom-color:var(--accent) }

/* ------------------------------------------------------------- mobile ---- */
@media (max-width:640px){
  body{ font-size:16px }
  nav .wrap{ height:auto; padding-top:10px; padding-bottom:10px; flex-wrap:wrap; gap:6px 16px }
  nav .links{ gap:16px; justify-content:flex-start; width:100% }
  nav .links a{ font-size:14px }
  header.hero{ padding:36px 0 30px }
  .hero-grid{ grid-template-columns:1fr; gap:24px }
  .photo{ width:150px; height:190px; order:-1 }
  h1{ font-size:32px }
  .news-item{ grid-template-columns:1fr; gap:2px }
  .news-date{ padding-top:0 }
  section{ scroll-margin-top:100px }
}