:root {
  --bg: #ffffff;
  --fg: #1a2b3c;
  --muted: #6b7280;
  --link: #1a4d6e; /* academic navy */
  --accent: #8B0000; /* dark red for highlights */
}

/* Base */
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.container { max-width: 920px; margin: 0 auto; padding: 32px 20px; }
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.site-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: .2px;
  color: #001f3f; /* dark navy */
}
.nav a { margin-right: 16px; color: var(--fg); }

.hero { margin: 28px 0 18px 0; }
.hero h1 { font-size: 30px; margin: 0 0 8px 0; }
.hero h2 { font-size: 1.2rem; font-weight: 500; margin: 0; color: var(--muted); }

.card {
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 22px;
  margin: 18px 0;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,.05);
}
.card h2 { font-size: 20px; margin: 0 0 10px 0; }

.list { margin: 0; padding-left: 18px; }
.footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid #e5e7eb;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

/* Extras */
.badge {
  display: inline-block;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--muted);
}
.button {
  display: inline-block;
  border: 1px solid var(--fg);
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--fg);
  text-decoration: none;
}
.tag {
  font-size: 12px;
  color: #374151;
  background: #f3f4f6;
  border-radius: 999px;
  padding: 4px 10px;
  margin-left: 8px;
}
ul.clean { list-style: none; padding-left: 0; margin: 0; }
h2.section { margin-top: 26px; }

/* Two-column only on wide screens */
@media (min-width:800px){
  .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
}

/* Headings / body palette */
h1,h2,h3,h4,h5,h6 {
  color: var(--fg);
  margin-top: .8em;
  margin-bottom: .4em;
}

/* Research section */
.research-links { list-style: none; padding: 0; margin: 0; }
.research-links li { margin-bottom: 12px; }
.research-links a { color: var(--link); font-weight: 500; }

/* Dark red only for "New Research" heading */
.research-section h2 { color: var(--accent); }

/* Collapsible papers */
.paper { margin-bottom: 2.2em; }
.paper-title { font-weight: 600; font-size: 1rem; margin-bottom: 0.3em; }
.paper-status { font-size: 0.95rem; color: #555; margin-bottom: 0.5em; }
.paper-links { font-size: 0.9rem; margin-bottom: 0.5em; }
.paper-links a { color: var(--link); margin-right: 6px; }

/* --- Clean summary (no default box/marker) --- */
details.abstract {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 10px 14px;
  background: #fafafa;
}
details.abstract[open] { background: #fff; }
details.abstract summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--link);
  list-style: none;          /* remove marker in most browsers */
  -webkit-appearance: none;  /* Safari */
  appearance: none;
}
details.abstract summary::marker { content: ""; } /* Firefox */
details.abstract summary::-webkit-details-marker { display: none; } /* Chrome/Safari */
details.abstract summary::after { content:" ▼"; font-size: .9em; }
details.abstract[open] summary::after { content:" ▲"; }

.paper-abstract { margin-top: .7em; font-size: .95rem; line-height: 1.7; color: #333; }

/* Media elements */
img,video { max-width: 100%; height: auto; }

/* Mobile menu button */
#menu-btn {
  display: none;
  border: 1px solid #e5e7eb;
  background: #fff;
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
}

/* --- Force visible separators on mobile --- */
@media (max-width:760px){
  /* Make sure each entry is block-level and spaced */
  .papers .paper,
  .research-section .paper{
    display:block;
    border-bottom:1px solid #e5e7eb;
    padding-bottom:1rem;
    margin-bottom:1.4rem;
  }

  /* Keep the last one clean */
  .papers .paper:last-child,
  .research-section .paper:last-child{
    border-bottom:0;
    margin-bottom:0;
    padding-bottom:0;
  }

  /* Give the details/summary a bit of breathing room */
  .research-section details.abstract{
    margin-top:.5rem;
  }

  /* If your list is a <ul>, remove bullets and left indent on mobile */
  .papers{
    list-style:none;
    padding-left:0;
    margin-left:0;
  }
}


/* Bigger tap targets */
.nav a,.button,.pill { padding: 8px 12px; }

/* Inline links */
.inline-links { white-space: nowrap; }
.inline-links a { margin: 0 6px; position: relative; font-weight: normal; }
.inline-links a + a::before { content:" | "; margin: 0 .35rem; color: #6b7280; }

/* Mobile tweaks */
@media (max-width:760px){
  .container { padding: 18px 14px; }
  .site-title { font-size: 22px; }
  .hero h1 { font-size: 1.4rem; }
  .hero h2 { font-size: 1.1rem; }
  .card { padding: 14px; border-radius: 12px; }
  .grid-2 { display: block; }

  /* Mobile nav */
  #menu-btn { display: inline-block; }
  .nav { display: none; width: 100%; margin-top: 8px; }
  .nav.open { display: block; }
  .nav a { display: block; margin: 6px 0; padding: 10px 0; }

  /* Bio */
  .bio-card p {
    text-align: justify !important;
    text-justify: inter-word;
    -webkit-hyphens: auto;
    hyphens: auto;
  }

  /* Inline links stacked */
  .inline-links { display: block; white-space: normal; }
  .inline-links a { display: block; margin: 6px 0; }
  .inline-links a::before { content: none !important; }
}

/* Bio picture */
.bio-card { text-align: center; }
.bio-card::after { content:""; display: block; clear: both; }
.bio-pic {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  margin: 0 auto 20px auto;
  box-shadow: 0 2px 6px rgba(0,0,0,.12);
}
@media (min-width:800px){
  .bio-card { text-align: left; }
  .bio-pic { float: left; margin: 0 24px 16px 0; }
}
.bio-card p { line-height: 1.85; margin-bottom: 1.7em; }
.bio-card p:last-child { margin-bottom: 0; }



/* Kill the default summary box/marker on all browsers + mobile */
.research-section details.abstract > summary,
.forthcoming-section details.abstract > summary{
  display: inline-flex;           /* no list box */
  align-items: center;
  gap: .4rem;
  list-style: none !important;    /* Firefox/Safari */
  -webkit-appearance: none;       /* iOS Safari */
  appearance: none;
  background: transparent !important;
  border: 0 !important;
  padding: 0 .95rem 0 0;          /* room on right for arrow */
  margin: 0;
  color: var(--link);
  font-weight: 500;
  cursor: pointer;
}

/* Hide native markers in all engines */
.research-section details.abstract > summary::-webkit-details-marker,
.forthcoming-section details.abstract > summary::-webkit-details-marker{
  display: none !important;
}
.research-section details.abstract > summary::marker,
.forthcoming-section details.abstract > summary::marker{
  content: "" !important;
}
.research-section details.abstract > summary::-moz-list-bullet,
.forthcoming-section details.abstract > summary::-moz-list-bullet{
  font-size: 0 !important;
}

/* Custom right–aligned arrow */
.research-section details.abstract > summary::after,
.forthcoming-section details.abstract > summary::after{
  content: "▼";
  margin-left: auto;              /* push arrow to the right */
  line-height: 1;
  font-size: .9em;
}
.research-section details.abstract[open] > summary::after,
.forthcoming-section details.abstract[open] > summary::after{
  content: "▲";
}

/* Nice focus without a boxy background */
.research-section details.abstract > summary:focus-visible,
.forthcoming-section details.abstract > summary:focus-visible{
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

/* Ensure list bullets are not showing on mobile around abstracts */
@media (max-width:760px){
  .papers, .research-links{ list-style: none; padding-left: 0; }
}



.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
  margin: 1.5rem 0;
}


.bio {
  text-align: justify;
}

@media (max-width: 768px) {
  .bio {
    text-align: left;
  }
}







/* Footer tone */
footer { color: #555; font-size: .9rem; }