/* ========== Design Tokens ========== */
:root{
  /* Core palette */
  --bg:#0b1020;           /* page background */
  --surface:#0f172a;      /* panels/cards */
  --surface-2:#111827;    /* alt panels */
  --border:#1f2937;
  --border-2:#233045;
  --text:#e5e7eb;
  --muted:#94a3b8;
  --link:#7dd3fc;
  --focus:#fde68a;

  /* Accent gradient */
  --accent:#38bdf8;
  --accent-2:#a78bfa;

  /* Layout */
  --radius-xl:18px;
  --radius-lg:16px;
  --radius-md:12px;
  --gap:16px;
  --container:1100px;

  /* Typography */
  --font:system-ui,-apple-system,Segoe UI,Roboto,Inter,Ubuntu,Arial,sans-serif;
  --fs-base:16px;
  --fs-sm:.9rem;
  --fs-xs:.8rem;
  --fs-h1:1.1rem;  /* brand title in header */
  --fs-h2:1.9rem;
  --fs-h3:1.2rem;
}

/* Optional light mode (only if someone forces light scheme) */
@media (prefers-color-scheme: light){
  :root{
    --bg:#0b1020; /* keep brand dark look */
  }
}

/* ========== Base / Reset ========== */
*{box-sizing:border-box}
html,body{height:100%}
html{font-size:var(--fs-base)}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font);line-height:1.5;
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;display:block}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{
  outline:2px solid var(--focus); outline-offset:3px; border-radius:.5rem;
}
h1,h2,h3,h4{margin:0 0 .35rem}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3)}
p{margin:.25rem 0 1rem}

/* ========== Layout ========== */
.container{max-width:var(--container);margin:0 auto;padding:24px}
header[aria-label="Primary"]{
  display:flex;gap:16px;align-items:center;justify-content:space-between;padding:16px 0
}
.brand{display:flex;gap:14px;align-items:center}
.brand .dot{width:14px;height:14px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2))}
.brand h1{font-size:var(--fs-h1);color:#fff}
nav[aria-label="Site"] a{margin-left:18px}

.subtitle{color:var(--muted);font-size:1rem;margin:.25rem 0 1rem}
.sep{border:none;border-top:1px solid var(--border);margin:26px 0}

/* Grid helpers */
.grid{display:grid;gap:var(--gap)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
@media (max-width:960px){
  .grid.cols-3,.grid.cols-2{grid-template-columns:1fr}
  nav[aria-label="Site"]{display:none}
}

/* Spacing utils */
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mb-16{margin-bottom:16px}

/* ========== Cards / Chips / Buttons ========== */
.card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:18px
}
.card.alt{background:var(--surface-2)}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  background:#1e293b;border:1px solid var(--border-2);color:#cbd5e1;
  padding:4px 10px;border-radius:999px;font-size:var(--fs-xs)
}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:var(--radius-md);
  border:1px solid var(--border-2);background:#1f2937;color:#fff
}
.btn.primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#0b1020;border:1px solid transparent
}

/* ========== Forms / Filters ========== */
.filters{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:16px;margin:18px 0;
  display:flex;gap:10px;flex-wrap:wrap;align-items:center
}
.filters input[type="search"], .filters select{
  background:#1f2937;border:1px solid var(--border-2);
  border-radius:10px;padding:10px;color:var(--text);min-width:220px
}
.meta{color:var(--muted);font-size:.95rem}

/* ========== Project & Publication Lists ========== */
.grid.projects .card h3,
.grid.publications .card h3{margin:.25rem 0 .35rem}

/* ========== Timeline (horizontal w/ mobile fallback) ========== */
.timeline{position:relative}
.timeline-h{overflow-x:auto;padding:14px}
.tl-track{
  display:flex;gap:18px;align-items:flex-start;
  scroll-snap-type:x proximity;padding-bottom:6px;position:relative
}
.tl-track::before{
  content:"";position:absolute;left:0;right:0;top:42px;height:2px;background:var(--border-2)
}
.tl-node{
  scroll-snap-align:start;min-width:240px;max-width:280px;
  background:var(--surface);border:1px solid var(--border);
  border-radius:16px;padding:12px 14px;position:relative
}
.tl-node .dot{
  position:absolute;width:14px;height:14px;border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  top:36px;left:-7px;box-shadow:0 0 0 3px var(--bg)
}
.tl-node .date{font-size:.85rem;color:var(--muted)}
.tl-node .title{margin:.25rem 0 .15rem 0;font-weight:600}
.tl-node .badges{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.tl-node .badge{
  padding:2px 8px;border-radius:999px;border:1px solid var(--border-2);
  background:#1f2937;font-size:var(--fs-xs)
}
@media (max-width:720px){
  .tl-track{display:block}
  .tl-track::before{left:16px;width:2px;height:100%;top:0}
  .tl-node{min-width:unset;margin-left:32px;margin-bottom:12px}
  .tl-node .dot{left:-1px;top:14px}
}

/* ========== Radial Progress (container styles; SVG injected via JS) ========== */
.radial{width:78px;height:78px;position:relative;display:inline-grid;place-items:center}
.radial svg{transform:rotate(-90deg);width:78px;height:78px}
.radial .pct{position:absolute;font-size:.9rem;font-variant-numeric:tabular-nums}
.radial-row{display:flex;align-items:center;gap:14px;margin-top:8px}
.radial-dates{display:flex;flex-direction:column;gap:4px}
.radial-dates .badge{
  padding:2px 8px;border-radius:999px;border:1px solid var(--border-2);
  background:#1f2937;font-size:var(--fs-xs);white-space:nowrap
}

/* ========== Tables (if needed) ========== */
table{width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden}
th,td{padding:10px 12px;border-bottom:1px solid var(--border)}
th{text-align:left;color:#cbd5e1;background:#0e172a}
tr:last-child td{border-bottom:none}

/* ========== Footer ========== */
footer{margin-top:28px;color:var(--muted)}

/* ========== Utilities (accessibility, helpers) ========== */
.sr-only{position:absolute !important;left:-9999px !important;width:1px;height:1px;overflow:hidden}
.badge{padding:2px 8px;border-radius:999px;border:1px solid var(--border-2);background:#1f2937;font-size:var(--fs-xs)}
.stack{display:flex;gap:8px;flex-wrap:wrap}

/* Optional: neutral card shadow on hover for pointer devices */
@media (hover:hover){
  .card:hover{box-shadow:0 2px 18px rgba(0,0,0,.25)}
}

/* ========== Print (minimal) ========== */
@media print{
  body{background:#fff;color:#000}
  .card, .filters{border-color:#ddd;background:#fff}
  a{color:#000}
}

/* Ensure dark background even on short pages */
html{background:var(--bg)}

/* Make the header look right with the current include.php structure */
header[aria-label="Primary"]{padding:0; background:transparent}
header[aria-label="Primary"] .brand{padding:16px 0}
header[aria-label="Primary"] .brand.container,
header[aria-label="Primary"] nav[aria-label="Site"]{
  max-width:var(--container);
  margin:0 auto;
}
header[aria-label="Primary"] .brand{display:flex;gap:14px;align-items:center}
header[aria-label="Primary"] nav[aria-label="Site"]{
  display:flex;gap:18px;justify-content:flex-end;padding-bottom:8px
}
@media (min-width:961px){
  header[aria-label="Primary"] .brand,
  header[aria-label="Primary"] nav[aria-label="Site"]{padding-left:24px;padding-right:24px}
}

/* Learning Highlights (homepage widget) */
.lrn-wrap{margin-top:28px}
.lrn-grid{display:grid;gap:14px;grid-template-columns:repeat(3,1fr)}
.lrn-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:14px;display:flex;align-items:center;gap:12px
}
.lrn-meta{display:flex;flex-direction:column;gap:4px}
.lrn-title{font-weight:600}
.lrn-sub{color:var(--muted);font-size:.9rem}
@media (max-width:960px){.lrn-grid{grid-template-columns:1fr}}
/* Reuse radial sizing for the compact widget */
.lrn-card .radial{width:62px;height:62px}
.lrn-card .radial svg{width:62px;height:62px}
.lrn-card .radial .pct{font-size:.85rem}
/* Tighter headings in grids to match the rest */
.grid.projects .card h3,
.grid.publications .card h3{margin:.35rem 0 .35rem}
/* ===== Collapsible Sections (Learning) ===== */
details.section{
  margin:16px 0;
  border:1px solid var(--border);
  border-radius:var(--radius-xl);
  overflow:hidden;
  background:var(--surface);
}

/* subtle focus ring when toggled via keyboard */
details.section:focus-within{box-shadow:0 0 0 2px var(--border-2) inset}

/* remove native markers across browsers so we only show one chevron */
details.section > summary { list-style:none; }
details.section > summary::-webkit-details-marker { display:none; }
details.section > summary::marker { content:""; }

/* clickable header area */
details.section > summary{
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:14px 16px;
  background:#0e172a; /* slightly darker header strip */
}

/* left cluster: status title + count badge */
.summ-left{display:flex;align-items:center;gap:10px}
.summ-badge{
  background:#1f2937;
  border:1px solid var(--border-2);
  border-radius:999px;
  padding:4px 10px;
  font-size:var(--fs-sm);
  color:#cbd5e1;
  white-space:nowrap;
}

/* the ONLY triangle (custom chevron) */
.chev{
  transition:transform .2s ease;
  font-size:1rem; /* keep it tidy */
  line-height:1;
  opacity:.9;
}
details.section[open] .chev{ transform:rotate(90deg); }

/* body area stays visually grouped with header */
.section-body{
  padding:16px;
  border-top:1px solid var(--border);
  background:var(--surface);
}
/* Legend styling for chart */
.legend{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.legend .item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 4px 12px;
  background: #1f2937;
  border-radius: 999px;
  font-size: .85rem;
}

.legend .swatch {
  width: 16px;
  height: 16px;
  border-radius: 3px;
}
.bib {
  display: none;
}
.chart-card {
    margin-top: 32px;  /* Adds vertical space above the chart */
}