/* ==========================================================================
   Francois Charette, PhD - personal site
   Hand-written, no framework, no jQuery.
   ========================================================================== */

:root {
  --bg:          #ffffff;
  --bg-soft:     #f5f7f9;
  --bg-raised:   #ffffff;
  --text:        #14181d;
  --muted:       #5b6672;
  --faint:       #8c96a1;
  --border:      #e2e7ec;
  --accent:      #1c5d9e;
  --accent-soft: #eaf2fa;
  --shadow:      0 1px 2px rgba(20, 24, 29, .05), 0 8px 24px rgba(20, 24, 29, .05);

  --shell:   68rem;
  --prose:   44rem;
  --radius:  10px;

  --sans:  system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --mono:  ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #0f1419;
    --bg-soft:     #151b22;
    --bg-raised:   #161d25;
    --text:        #e5eaef;
    --muted:       #97a3af;
    --faint:       #6f7c88;
    --border:      #253039;
    --accent:      #6cb0ef;
    --accent-soft: #17273a;
    --shadow:      0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 650; letter-spacing: -0.01em; }

.shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: .6rem 1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

/* --- Site nav ------------------------------------------------------------ */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

@supports (backdrop-filter: blur(10px)) {
  .site-nav {
    background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: saturate(150%) blur(10px);
  }
}

.site-nav[data-stuck="true"] { border-bottom-color: var(--border); }

.site-nav .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.75rem;
}

.nav-brand {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.nav-brand span { color: var(--muted); font-size: .85em; }

.nav-links {
  display: flex;
  gap: .25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  display: block;
  padding: .45rem .7rem;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
  font-size: .9rem;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text); background: var(--bg-soft); }
.nav-links a[aria-current="true"] { color: var(--accent); background: var(--accent-soft); }

/* --- Hero ---------------------------------------------------------------- */

.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(60rem 24rem at 12% -8rem, var(--accent-soft), transparent 70%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3rem;
  align-items: center;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 5.5vw, 3.1rem);
  margin: 0 0 .35rem;
  letter-spacing: -0.02em;
}

.hero .role {
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  color: var(--muted);
  margin: 0 0 1.25rem;
  max-width: 34rem;
}
.hero .role strong { color: var(--text); font-weight: 600; }

.hero .lede {
  max-width: var(--prose);
  margin: 0 0 1.75rem;
  color: var(--text);
}

.portrait {
  width: 190px;
  height: 190px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--bg-raised);
  box-shadow: var(--shadow);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .55rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-raised);
  color: var(--text);
  font-size: .92rem;
  font-weight: 500;
  text-decoration: none;
  transition: background .15s ease, border-color .15s ease;
}
.btn:hover { background: var(--bg-soft); border-color: var(--faint); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 85%, #000); border-color: transparent; }
.btn svg { width: 1em; height: 1em; flex: none; }

/* --- Stat strip ---------------------------------------------------------- */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 1px;
  margin: 2.5rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.stats li {
  background: var(--bg-raised);
  padding: 1rem 1.1rem;
}
.stats b {
  display: block;
  font-size: 1.6rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.stats span {
  display: block;
  font-size: .8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* --- Sections ------------------------------------------------------------ */

.section { padding: 4rem 0; border-bottom: 1px solid var(--border); }
.section:last-of-type { border-bottom: 0; }

.section-head { margin-bottom: 2rem; }
.section-head h2 {
  font-size: 1.7rem;
  margin: 0 0 .4rem;
}
.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: var(--prose);
}

.eyebrow {
  display: block;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .5rem;
}

.prose { max-width: var(--prose); }
.prose p { margin: 0 0 1.1rem; }
.prose p:last-child { margin-bottom: 0; }

.subsection { margin-top: 3rem; }
.subsection h3 {
  font-size: 1.2rem;
  margin: 0 0 1.25rem;
}

/* --- About --------------------------------------------------------------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 17rem;
  gap: 3rem;
  align-items: start;
}

.card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}
.card h3 {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin: 0 0 .8rem;
  font-weight: 600;
}
.card + .card { margin-top: 1rem; }

.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li + li { margin-top: .7rem; }
.contact-list a { text-decoration: none; word-break: break-word; }
.contact-list a:hover { text-decoration: underline; }
.contact-list .label {
  display: block;
  font-size: .75rem;
  color: var(--faint);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* --- Current work / projects --------------------------------------------- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}

.project {
  display: block;
  position: relative;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  color: inherit;
  text-decoration: none;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.project:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.project h3 {
  margin: 0 0 .5rem;
  font-size: 1.02rem;
  color: var(--accent);
}
.project p {
  margin: .55rem 0 0;
  font-size: .9rem;
  color: var(--muted);
}

.badge {
  display: inline-block;
  padding: .1rem .5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--muted);
}
.badge-wip { border-color: var(--accent); color: var(--accent); }

.project-cta { margin: 1.75rem 0 0; }

/* --- Timeline ------------------------------------------------------------ */

.role-list { list-style: none; margin: 0; padding: 0; }

.role-item {
  position: relative;
  padding: 0 0 1.75rem 1.75rem;
  border-left: 2px solid var(--border);
}
.role-item:last-child { padding-bottom: 0; border-left-color: transparent; }
.role-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: .5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.role-item h4 {
  margin: 0;
  font-size: 1.02rem;
}
.role-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .75rem;
  margin: .15rem 0 .55rem;
  font-size: .85rem;
  color: var(--muted);
}
.role-meta .years { font-variant-numeric: tabular-nums; }
.role-item p { margin: 0 0 .6rem; max-width: var(--prose); }
.role-item ul { margin: .4rem 0 0; padding-left: 1.1rem; max-width: var(--prose); }
.role-item li { margin-bottom: .3rem; }

.employer {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .75rem;
  margin-bottom: 1.5rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--border);
}
.employer h3 { margin: 0; font-size: 1.25rem; }
.employer .years { color: var(--muted); font-size: .9rem; font-variant-numeric: tabular-nums; }

/* --- Education / degrees ------------------------------------------------- */

.degree-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1rem;
}
.degree {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}
.degree h4 { margin: 0 0 .1rem; font-size: 1rem; }
.degree .school { color: var(--accent); font-size: .9rem; font-weight: 500; }
.degree .years { display: block; color: var(--faint); font-size: .82rem; margin-bottom: .6rem; font-variant-numeric: tabular-nums; }
.degree p { font-size: .9rem; margin: 0; color: var(--muted); }
.degree p em { color: var(--text); font-style: normal; font-weight: 550; }
.degree ul { margin: .5rem 0 0; padding-left: 1.05rem; font-size: .9rem; color: var(--muted); }
.degree li { margin-bottom: .35rem; }

/* --- Skills -------------------------------------------------------------- */

.skill-group + .skill-group { margin-top: 1.5rem; }
.skill-group h4 {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin: 0 0 .6rem;
  font-weight: 600;
}
.tags { display: flex; flex-wrap: wrap; gap: .45rem; list-style: none; margin: 0; padding: 0; }
.tags li {
  padding: .3rem .7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
  font-size: .88rem;
}

/* --- Award / scholarship lists ------------------------------------------- */

.award-columns {
  columns: 2;
  column-gap: 2.5rem;
}
.award-list { list-style: none; margin: 0; padding: 0; }
.award-list li {
  break-inside: avoid;
  display: flex;
  gap: .85rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .93rem;
}
.award-list .year {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  flex: none;
  min-width: 4.6rem;
}

/* --- Publications -------------------------------------------------------- */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 2rem;
}
.filter {
  font: inherit;
  font-size: .88rem;
  padding: .4rem .85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-raised);
  color: var(--muted);
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.filter:hover { color: var(--text); border-color: var(--faint); }
.filter[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.filter .count {
  font-variant-numeric: tabular-nums;
  opacity: .65;
  margin-left: .35rem;
}

.pub-group + .pub-group { margin-top: 2.75rem; }
.pub-group[hidden] { display: none; }
.pub-group > h3 {
  font-size: 1.15rem;
  margin: 0 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}
.pub-group > h3 .count {
  font-size: .8rem;
  font-weight: 500;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.pub-list { list-style: none; margin: 0; padding: 0; }
.pub-list > li {
  padding: .85rem 0;
  border-bottom: 1px solid var(--border);
}
.pub-list > li:last-child { border-bottom: 0; }

.pub-title {
  display: block;
  font-weight: 550;
  margin-bottom: .15rem;
}
a.pub-title { color: var(--text); text-decoration: none; }
a.pub-title:hover { color: var(--accent); text-decoration: underline; }
a.pub-title::after {
  content: "PDF";
  display: inline-block;
  margin-left: .5rem;
  padding: .05rem .35rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: .65rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--muted);
  vertical-align: middle;
  transform: translateY(-1px);
}
a.pub-title:hover::after { border-color: var(--accent); color: var(--accent); }

.pub-meta {
  display: block;
  font-size: .88rem;
  color: var(--muted);
}
.pub-meta .id {
  font-family: var(--mono);
  font-size: .85em;
  color: var(--text);
}

/* --- Footer -------------------------------------------------------------- */

.site-footer {
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--muted);
  font-size: .88rem;
}
.site-footer .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.site-footer p { margin: 0; }

.to-top { color: var(--muted); text-decoration: none; }
.to-top:hover { color: var(--accent); }

/* --- Responsive ---------------------------------------------------------- */

@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero-portrait { order: -1; }
  .portrait { width: 130px; height: 130px; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .award-columns { columns: 1; }
}

@media (max-width: 620px) {
  .hero { padding: 3rem 0 2.5rem; }
  .section { padding: 3rem 0; }
  .nav-brand span { display: none; }
  .shell { padding: 0 1.15rem; }
}

@media print {
  .site-nav, .actions, .filters, .to-top, .hero-portrait { display: none; }
  body { font-size: 11pt; }
  .section, .hero { border: 0; padding: 1rem 0; }
  .pub-group[hidden] { display: block !important; }
  a { color: inherit; text-decoration: none; }
}