/* ---------------------------------------------------------------
   Frédéric Li Combeau — researcher site
   Two-ink print aesthetic (day) that turns into a starfield (night).
   --------------------------------------------------------------- */

:root{
  --bg: #f5f1e6;
  --bg-alt: #ece5d3;
  --ink: #211f1a;
  --ink-soft: #5b5648;
  --ink-faint: #948c78;
  --rule: #d9d0b8;
  --accent: #2c3a63;
  --accent-warm: #a6501f;
  --card-bg: #faf7ee;
  --shadow: rgba(33,31,26,0.08);

  --serif-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --serif-body: "Newsreader", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --max: 920px;
  --gap: clamp(1.25rem, 3vw, 2.5rem);

  color-scheme: light;
}

html[data-theme="night"]{
  --bg: #0c1020;
  --bg-alt: #12172b;
  --ink: #e9e4d6;
  --ink-soft: #b3ad9c;
  --ink-faint: #6b6c85;
  --rule: #262c48;
  --accent: #8fa6ff;
  --accent-warm: #e8a978;
  --card-bg: #10142688;
  --shadow: rgba(0,0,0,0.35);
  color-scheme: dark;
}

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

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif-body);
  font-size: 17px;
  line-height: 1.6;
  transition: background-color .5s ease, color .5s ease;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ transition: none !important; animation: none !important; }
}

/* paper grain overlay */
.grain{
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .5;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='matrix' values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.035 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
html[data-theme="night"] .grain{ mix-blend-mode: screen; opacity: .35; }

a{ color: inherit; }

h1, h2, h3, h4{
  font-family: var(--serif-display);
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.01em;
}

.subtle{ font-weight: 400; color: var(--ink-soft); font-size: .8em; }

/* ---------- header ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--gap);
  padding: 1.1rem clamp(1.25rem, 5vw, 3rem);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}

.wordmark{
  font-family: var(--mono);
  font-weight: 500;
  font-size: .95rem;
  text-decoration: none;
  letter-spacing: .02em;
  white-space: nowrap;
}

.site-nav{
  display: flex;
  gap: clamp(.85rem, 2vw, 1.6rem);
  margin-left: auto;
  font-family: var(--mono);
  font-size: .82rem;
  flex-wrap: wrap;
}

.site-nav a{
  text-decoration: none;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 2px;
}
.site-nav a::after{
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--accent-warm);
  transition: right .25s ease;
}
.site-nav a:hover::after,
.site-nav a.active::after{ right: 0; }
.site-nav a.active{ color: var(--ink); }

#theme-toggle{
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink);
  border-radius: 999px;
  width: 2.1rem;
  height: 2.1rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  flex: none;
}
#theme-toggle svg{ width: 1.1rem; height: 1.1rem; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; }
#theme-toggle .icon-night{ display: none; }
html[data-theme="night"] #theme-toggle .icon-day{ display: none; }
html[data-theme="night"] #theme-toggle .icon-night{ display: block; fill: currentColor; stroke: none; }

/* ---------- layout helpers ---------- */
main, footer{
  position: relative;
  z-index: 2;
}

section{
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1.25rem, 5vw, 3rem);
}

section > h2{
  font-size: clamp(1.4rem, 2vw, 1.7rem);
  display: flex;
  align-items: baseline;
  gap: .75rem;
  margin-bottom: 2rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--rule);
}

.num{
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--accent-warm);
  font-weight: 500;
}

.section-note{
  margin-top: -1.3rem;
  margin-bottom: 1.8rem;
  color: var(--ink-faint);
  font-style: italic;
  font-size: .95rem;
}

/* ---------- hero ---------- */
.hero{
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 8vw, 5.5rem) clamp(1.25rem, 5vw, 3rem) clamp(2rem, 6vw, 4rem);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(2rem, 5vw, 3rem);
  align-items: start;
}

.eyebrow{
  font-family: var(--mono);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-soft);
  margin: 0 0 .9rem;
}

.hero h1{
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  line-height: .98;
  margin-bottom: 1.3rem;
}

.lede{
  font-size: 1.18rem;
  max-width: 46ch;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
}

.now{
  font-family: var(--serif-body);
  font-size: 1rem;
  max-width: 52ch;
  margin: 0 0 1.8rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent-warm);
  color: var(--ink);
}

.tag{
  font-family: var(--mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--accent-warm);
  margin-right: .5em;
}

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

.pill{
  font-family: var(--mono);
  font-size: .82rem;
  border: 1px solid var(--rule);
  background: var(--card-bg);
  color: var(--ink);
  padding: .5rem .9rem;
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  transition: border-color .2s ease, transform .2s ease;
  position: relative;
}
.pill:hover{ border-color: var(--accent-warm); transform: translateY(-1px); }

#copy-email, #copy-email-2{ overflow: hidden; }
.pill-copied{
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background: var(--accent-warm);
  color: var(--bg);
  transform: translateY(100%);
  transition: transform .25s ease;
}
.pill.is-copied .pill-copied{ transform: translateY(0); }

/* hero constellation figure */
.hero-figure{
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: .5rem;
}
#orion{ width: 100%; max-width: 220px; height: auto; }
#orion .lines{ stroke: var(--ink-faint); stroke-width: 1; opacity: .55; }
#orion .stars circle{
  fill: var(--accent);
  cursor: default;
  transition: fill .3s ease, r .2s ease;
}
#orion .stars circle:hover{ fill: var(--accent-warm); }
html[data-theme="night"] #orion .stars circle{
  fill: #f4efe0;
  filter: drop-shadow(0 0 3px rgba(244,239,224,.8));
}
html[data-theme="night"] #orion .lines{ stroke: #3a4166; opacity: .7; }

#star-label{
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--ink-faint);
  height: 1.2rem;
  margin-top: .4rem;
}

/* ---------- research timeline ---------- */
.timeline{
  list-style: none;
  margin: 0; padding: 0;
  position: relative;
  border-left: 1px solid var(--rule);
}

.entry{
  position: relative;
  padding: 0 0 2.4rem 2rem;
}
.entry:last-child{ padding-bottom: 0; }
.entry::before{
  content: "";
  position: absolute;
  left: -4.5px; top: .4rem;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}

.entry-meta{
  display: flex;
  gap: 1rem;
  align-items: baseline;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--ink-faint);
  margin-bottom: .5rem;
  flex-wrap: wrap;
}
.entry-date{ font-family: var(--mono); }
.entry-status{
  color: var(--accent-warm);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: .1rem .55rem;
}

.entry h3{ font-size: 1.25rem; margin-bottom: .4rem; line-height: 1.3; }
.entry-place{ margin: 0; font-weight: 500; }
.entry-people{ margin: .15rem 0 .6rem; color: var(--ink-soft); font-size: .95rem; }
.entry-desc{ margin: 0; color: var(--ink-soft); max-width: 65ch; }

/* ---------- projects ---------- */
.project-grid{
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.1rem;
}

.project{
  position: relative;
  border: 1px solid var(--rule);
  background: var(--card-bg);
  border-radius: 6px;
  padding: 1.3rem 1.4rem 1.5rem;
  box-shadow: 2px 2px 0 var(--shadow);
  display: flex;
  flex-direction: column;
}

.project:nth-child(5){ grid-column: 1 / -1; }

.project-tag{
  font-family: var(--mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--ink-faint);
}

.project h3{
  font-size: 1.08rem;
  line-height: 1.35;
  margin: .5rem 0 .6rem;
}

.project p{ margin: 0 0 .8rem; color: var(--ink-soft); font-size: .96rem; }
.project p a{ color: var(--accent); text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 2px; }

.project > a{
  margin-top: auto;
  font-family: var(--mono);
  font-size: .82rem;
  text-decoration: none;
  color: var(--accent);
  align-self: flex-start;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
}

.stamp{
  position: absolute;
  top: 1.1rem; right: 1.2rem;
  font-family: var(--mono);
  font-size: .66rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--accent-warm);
  border: 1px dashed var(--accent-warm);
  border-radius: 4px;
  padding: .2rem .45rem;
  transform: rotate(4deg);
}

/* ---------- background ---------- */
.background-grid{
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.edu-entry{ margin-bottom: 1.6rem; }
.edu-entry:last-child{ margin-bottom: 0; }
.edu-entry h3{ font-size: 1.05rem; margin: .3rem 0 .2rem; }
.edu-entry .entry-place{ margin: 0 0 .4rem; color: var(--ink-soft); }
.course-list{
  margin: 0;
  font-size: .88rem;
  color: var(--ink-faint);
  font-family: var(--mono);
  line-height: 1.7;
}

.skill-group{ margin-bottom: 1.4rem; }
.skill-group:last-child{ margin-bottom: 0; }
.skill-group h4{
  font-family: var(--mono);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--ink-faint);
  margin-bottom: .4rem;
}
.skill-group p{ margin: 0; color: var(--ink-soft); font-size: .95rem; }

/* ---------- off the clock / marginalia ---------- */
.marginalia{
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.marginalia li{
  padding-left: 5.2rem;
  position: relative;
  color: var(--ink-soft);
  font-size: 1.02rem;
}
.m-year{
  position: absolute;
  left: 0;
  width: 4.4rem;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--accent-warm);
  text-align: right;
  padding-right: 1rem;
  border-right: 1px solid var(--rule);
}

/* ---------- footer ---------- */
footer{
  border-top: 1px solid var(--rule);
  margin-top: 2rem;
}
.footer-inner{
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1.25rem, 5vw, 3rem) 3rem;
}
.footer-lede{
  font-size: 1.3rem;
  font-family: var(--serif-display);
  font-weight: 500;
  max-width: 56ch;
  margin: 0 0 1.6rem;
}
.footer-meta{
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--ink-faint);
  margin: 1.6rem 0 0;
}

/* ---------- responsive ---------- */
@media (max-width: 760px){
  .site-nav{ display: none; }
  .hero{ grid-template-columns: 1fr; }
  .hero-figure{ order: -1; max-width: 160px; margin: 0 auto 1rem; }
  .background-grid{ grid-template-columns: 1fr; }
  .project-grid{ grid-template-columns: 1fr; }
  .project:nth-child(5){ grid-column: auto; }
  .marginalia li{ padding-left: 3.6rem; }
  .m-year{ width: 3rem; font-size: .68rem; padding-right: .6rem; }
}