/* Boehm Research Group — site stylesheet
   Palette: muted blue paper, deep ink, ocean-blue primary, slate-blue accent, cool hairline.
   Type: Public Sans, one family throughout, weight does the differentiating.
*/

@import url('https://fonts.googleapis.com/css2?family=Public+Sans:wght@400;500;600;700;800&display=swap');

:root{
  --paper:   #EEF3F7;
  --paper-2: #FFFFFF;
  --ink:     #1B2A38;
  --muted:   #58697A;
  --deep:    #1E4E72;   /* deep ocean blue — primary */
  --deep-2:  #163B58;
  --tide:    #4C7C9E;   /* lighter steel blue */
  --accent:    #5C7C9C;   /* muted slate blue — dates / small accents */
  --line:    #D6E0E8;   /* hairline */
  --line-2:  #E4EBF0;
  --focus:   #2E7093;
  --heading-accent:  #1265D8;   /* bright blue — headings accent */
  --maxw: 760px;
  --wide: 1220px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Public Sans', sans-serif;
  font-size:17px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,.serif{
  font-family:'Public Sans', sans-serif;
  font-weight:700;
  color:var(--heading-accent);
  letter-spacing:-0.01em;
}

a{color:var(--deep); text-decoration-color:var(--line);}
a:hover{color:var(--deep-2);}
a:visited{color:var(--tide);}
:focus-visible{outline:2px solid var(--focus); outline-offset:2px; border-radius:2px;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
}

img{max-width:100%; display:block;}

/* ---------- Masthead / nav ---------- */
.site-header{
  position:sticky; top:0; z-index:20;
  background:rgba(238,243,247,0.92);
  backdrop-filter:saturate(140%) blur(6px);
  border-bottom:1px solid var(--line);
}
.nav-row{
  max-width:var(--wide); margin:0 auto;
  display:flex; align-items:baseline; justify-content:space-between;
  padding:16px 24px; gap:24px;
}
.wordmark{
  font-family:'Public Sans', sans-serif; font-weight:700; font-size:19px;
  color:var(--ink); text-decoration:none; white-space:nowrap;
}
.wordmark:hover{color:var(--deep);}
.nav-links{display:flex; gap:22px; flex-wrap:wrap; list-style:none; margin:0; padding:0;}
.nav-links a{
  color:var(--ink); text-decoration:none; font-size:15px; font-weight:500;
  padding-bottom:4px; border-bottom:2px solid transparent;
}
.nav-links a:hover{border-bottom-color:var(--line);}
.nav-links a.active{color:var(--deep); border-bottom-color:var(--deep);}

/* ---------- Page shell ---------- */
main{max-width:var(--wide); margin:0 auto; padding:0 24px 80px;}
.col{max-width:var(--maxw); margin:0 auto;}

footer.site-footer{
  border-top:1px solid var(--line);
  color:var(--muted); font-size:13px;
  text-align:center; padding:28px 24px 48px;
}

/* ---------- Home / masthead ---------- */
.hero{
  display:flex; gap:36px; align-items:flex-start;
  padding:48px 0 28px; border-bottom:1px solid var(--line);
  max-width:var(--wide); margin:0 auto;
}
.hero-photo{
  width:168px; height:168px; flex:none; border-radius:6px;
  overflow:hidden; background:var(--line-2);
}
.hero-photo img{width:100%; height:100%; object-fit:cover;}
.hero-text h1{font-size:32px; margin:0 0 6px;}
.hero-text .role{color:var(--muted); font-size:15px; line-height:1.6; margin:0 0 14px;}
.hero-text .contact{font-size:14px; color:var(--muted);}
.hero-text .contact a{color:var(--deep);}

.lab-banner{max-width:420px; margin:0 auto; padding:8px 0 34px; text-align:center;}
.lab-banner img{width:100%; border-radius:8px; display:block;}
.lab-banner .caption{margin-top:10px; font-size:13px; color:var(--muted); text-align:center; font-style:italic;}

.section{padding:34px 0; border-bottom:1px solid var(--line-2); max-width:var(--wide); margin:0 auto;}
.section:last-of-type{border-bottom:none;}
.section-grid{display:grid; grid-template-columns:180px 1fr; gap:28px;}
.section-label{
  font-family:'Public Sans', sans-serif; font-weight:700; font-size:18px; color:var(--heading-accent);
  padding-top:2px;
}
.section-body{max-width:640px; text-align:left;}
.section-body p{margin:0 0 14px;}

.timeline{display:flex; flex-direction:column; gap:0;}
.timeline-row{
  display:grid; grid-template-columns:96px 1fr; gap:18px;
  padding:10px 0; border-top:1px solid var(--line-2);
}
.timeline-row:first-child{border-top:none;}
.timeline-year{color:var(--accent); font-weight:600; font-size:14px; font-variant-numeric:tabular-nums; white-space:nowrap;}
.timeline-desc{font-size:15px;}
.timeline-desc i{color:var(--muted);}

.links-inline a{margin-right:16px;}

@media (max-width:640px){
  .nav-row{flex-direction:column; align-items:flex-start; gap:10px; padding:14px 20px;}
  .nav-links{flex-wrap:nowrap; overflow-x:auto; width:100%; gap:18px; -ms-overflow-style:none; scrollbar-width:none;}
  .nav-links::-webkit-scrollbar{display:none;}
  .nav-links li{flex:none;}
  .hero{flex-direction:column; padding-top:32px;}
  .hero-photo{width:120px; height:120px;}
  .section-grid{grid-template-columns:1fr; gap:8px;}
  .timeline-row{grid-template-columns:76px 1fr;}
}

/* ---------- Courses ---------- */
.course{padding:26px 0; border-top:1px solid var(--line-2);}
.course:first-child{border-top:none;}
.course-head{display:flex; justify-content:space-between; align-items:baseline; gap:16px; flex-wrap:wrap;}
.course-title{font-family:'Public Sans', sans-serif; font-weight:700; font-size:19px; color:var(--heading-accent);}
.course-code{color:var(--accent); font-weight:700; font-size:19px; margin-right:10px;}
.course-units{color:var(--muted); font-size:13px; white-space:nowrap; text-align:right;}
.course-desc{margin-top:8px; color:var(--ink); font-size:15.5px; max-width:680px;}
.course-note{color:var(--muted); font-size:13.5px; margin-top:6px;}

/* ---------- Projects ---------- */
.project-grid{display:flex; flex-direction:column; gap:0;}
.project{
  display:grid; grid-template-columns:220px 1fr; gap:28px;
  padding:32px 0; border-top:1px solid var(--line-2); align-items:start;
}
.project:first-child{border-top:none;}
.project-photo{border-radius:6px; overflow:hidden; background:var(--line-2); aspect-ratio:4/3;}
.project-photo img{width:100%; height:100%; object-fit:cover;}
.project-title{font-family:'Public Sans', sans-serif; font-size:19px; font-weight:700; margin:0 0 8px;}
.project-desc{font-size:15.5px;}
.project-caption{font-size:12.5px; color:var(--muted); margin-top:8px; font-style:italic;}
@media (max-width:640px){
  .project{grid-template-columns:1fr;}
  .project-photo{width:100%; max-width:280px;}
}

/* ---------- Students ---------- */
.group-photo{margin:0 0 44px;}
.group-photo img{border-radius:6px;}
.group-caption{font-size:13.5px; color:var(--muted); margin-top:10px; text-align:center;}
.group-caption b{color:var(--ink);}

.people-heading{
  font-family:'Public Sans', sans-serif; font-size:22px; font-weight:600; color:var(--heading-accent);
  margin:0 0 20px; padding-top:12px;
}
.people-grid{
  display:grid; grid-template-columns:repeat(3, 1fr); gap:28px 24px;
  margin-bottom:12px;
}
.person{display:flex; flex-direction:column;}
.person-photo{
  width:100%; aspect-ratio:1/1; border-radius:6px; overflow:hidden;
  background:var(--line-2); margin-bottom:10px;
}
.person-photo img{width:100%; height:100%; object-fit:cover;}
.person-photo.placeholder{
  display:flex; align-items:center; justify-content:center;
  font-family:'Public Sans', sans-serif; font-size:34px; color:var(--tide); background:var(--line-2);
}
.person-name{font-weight:600; font-size:15.5px; line-height:1.3;}
.person-degree{color:var(--accent); font-size:12.5px; font-weight:600; margin:2px 0 6px;}
.person-bio{font-size:13.5px; color:var(--muted); line-height:1.5;}

@media (max-width:760px){
  .people-grid{grid-template-columns:repeat(2, 1fr);}
}
@media (max-width:460px){
  .people-grid{grid-template-columns:1fr 1fr; gap:18px 14px;}
  .person-bio{display:none;}
}

/* ---------- Papers ---------- */
.papers-shell{display:grid; grid-template-columns:120px 1fr; gap:40px; align-items:start;}
.year-nav{position:sticky; top:88px; display:flex; flex-direction:column; gap:6px; font-size:13px;}
.year-nav a{color:var(--muted); text-decoration:none;}
.year-nav a:hover{color:var(--deep);}
.paper-links{margin:0 0 28px; font-size:14.5px;}
.paper-links a{margin-right:18px;}

.pub-section{margin-top:46px;}
.pub-section:first-of-type{margin-top:0;}
.pub-year{
  display:flex; align-items:center; justify-content:space-between; gap:14px;
  margin:0 0 18px; padding-top:26px; border-top:3px solid var(--line);
  scroll-margin-top:90px;
}
.pub-section:first-of-type .pub-year{border-top:none; padding-top:0;}
.pub-year-chip{
  font-family:'Public Sans', sans-serif; font-weight:800; font-size:15px;
  letter-spacing:0.03em; color:#fff; background:var(--accent);
  padding:6px 14px; border-radius:4px; white-space:nowrap;
}
.pub-year--divider .pub-year-chip{background:var(--deep); font-size:17px;}
.pub-list{list-style:none; margin:0; padding:0;}
.pub-list li{
  font-size:15px; line-height:1.6; padding:10px 0; border-top:1px solid var(--line-2);
}
.pub-list li:first-child{border-top:none;}
.pub-list a{font-size:13.5px;}

@media (max-width:760px){
  .papers-shell{grid-template-columns:1fr;}
  .year-nav{position:static; flex-direction:row; flex-wrap:wrap; gap:10px; padding-bottom:20px; border-bottom:1px solid var(--line);}
}

/* ---------- small sub-pages (chapters/protocols) ---------- */
.subpage-back{font-size:14px; margin-bottom:24px; display:inline-block;}
.subpage-title{font-size:24px; margin:0 0 20px;}