/* ============================================
   Samprity Saha — Portfolio
   Aesthetic: scientific journal × biology lab notebook
   Palette: cream paper, ink navy, carmine, sage
   ============================================ */

:root {
  --serif: 'Cormorant Garamond', 'EB Garamond', Georgia, serif;
  --sans: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'JetBrains Mono', 'IBM Plex Mono', Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .4s, color .4s;
}

body {
  position: relative;
  overflow-x: hidden;
}

/* canvas ripple background */
#bgCanvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

main { position: relative; z-index: 1; }

/* ---------- Top bar ---------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 36px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: linear-gradient(to bottom, var(--paper) 60%, transparent);
  pointer-events: none;
}
.topbar .left,
.topbar .right { display: flex; gap: 28px; align-items: center; pointer-events: auto; }
.topbar a { color: inherit; text-decoration: none; padding-bottom: 2px; border-bottom: 1px solid transparent; transition: border-color .2s; }
.topbar a:hover { border-color: var(--carmine); color: var(--carmine); }
.topbar .seal {
  width: 26px; height: 26px;
  border: 1px solid var(--ink); border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--serif); font-size: 13px; font-style: italic;
  color: var(--ink);
}

/* ---------- Section scaffolding ---------- */
section {
  position: relative;
  padding: 120px 60px;
  max-width: 1280px;
  margin: 0 auto;
}

.section-marker {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--carmine);
  margin-bottom: 28px;
}
.section-marker::before {
  content: "";
  width: 36px; height: 1px;
  background: var(--carmine);
  align-self: center;
}
.section-marker .num { color: var(--ink-faint); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  padding-top: 140px;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 60px;
  align-items: center;
}

.hero-meta {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: flex; flex-direction: column; gap: 8px;
  margin-bottom: 32px;
}
.hero-meta .row { display: flex; gap: 18px; }
.hero-meta .k { color: var(--carmine); }

.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(64px, 9vw, 132px);
  line-height: 0.92;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.hero h1 .it {
  font-style: italic;
  color: var(--carmine);
  font-weight: 400;
}
.hero h1 small {
  display: block;
  font-size: 0.18em;
  font-family: var(--mono);
  font-weight: 400;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 22px;
}

.hero-sub {
  margin-top: 36px;
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.5;
  font-style: italic;
  color: var(--ink-soft);
  max-width: 560px;
}

.hero-tags {
  margin-top: 28px;
  display: flex; flex-wrap: wrap; gap: 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.hero-tags span {
  padding: 5px 11px;
  border: 1px solid var(--rule-strong);
  color: var(--ink-soft);
  border-radius: 99px;
}

.hero-cta {
  margin-top: 32px;
  display: flex; flex-wrap: wrap; gap: 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.hero-cta a {
  color: var(--ink);
  text-decoration: none;
  padding: 10px 16px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  transition: background-color .2s, color .2s, border-color .2s;
}
.hero-cta a:first-child {
  background: var(--carmine);
  color: var(--paper);
  border-color: var(--carmine);
}
.hero-cta a:first-child:hover {
  background: transparent;
  color: var(--carmine);
}
.hero-cta a:hover {
  border-color: var(--carmine);
  color: var(--carmine);
}

/* hero side card — specimen plate */
.specimen {
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: 22px;
  position: relative;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.specimen::before {
  content: "";
  position: absolute; inset: 6px;
  border: 1px solid var(--rule);
  pointer-events: none;
}
.specimen .label {
  display: flex; justify-content: space-between;
  border-bottom: 1px solid var(--rule); padding-bottom: 10px; margin-bottom: 14px;
}
.specimen .label .v { color: var(--carmine); }
.specimen .scope { width: 100%; aspect-ratio: 1; margin: 10px 0; }
.specimen dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; padding-top: 12px; border-top: 1px solid var(--rule); }
.specimen dt { color: var(--ink-faint); }
.specimen dd { color: var(--ink); text-align: right; }

/* corner registration ticks */
.tick { position: absolute; width: 10px; height: 10px; border-color: var(--ink); }
.tick.tl { top: -1px; left: -1px; border-top: 1px solid; border-left: 1px solid; }
.tick.tr { top: -1px; right: -1px; border-top: 1px solid; border-right: 1px solid; }
.tick.bl { bottom: -1px; left: -1px; border-bottom: 1px solid; border-left: 1px solid; }
.tick.br { bottom: -1px; right: -1px; border-bottom: 1px solid; border-right: 1px solid; }

/* ---------- About ---------- */
.about {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 80px;
  align-items: start;
}
.about-text h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 44px;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  max-width: 18ch;
}
.about-text h2 em { color: var(--carmine); font-style: italic; }
.about-text p {
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 18px;
  max-width: 58ch;
}
.about-text p .drop {
  font-family: var(--serif);
  font-size: 56px;
  float: left;
  line-height: 0.9;
  margin: 4px 10px -2px 0;
  color: var(--carmine);
  font-style: italic;
}

.about-aside { position: sticky; top: 80px; }
.about-aside .frame {
  border: 1px solid var(--ink);
  padding: 18px;
  background: var(--paper-2);
  position: relative;
}
.about-aside .frame::after {
  content: "FIG. 01 — H. SAPIENS, RESEARCHER (in situ)";
  position: absolute; bottom: -22px; left: 0;
  font-family: var(--mono); font-size: 10px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-faint);
}
.about-aside .portrait-placeholder {
  aspect-ratio: 4/5;
  background:
    repeating-linear-gradient(45deg, var(--paper-3) 0 6px, transparent 6px 12px),
    var(--paper);
  display: grid; place-items: center;
  position: relative;
  border: 1px solid var(--rule);
}
.about-aside .portrait-placeholder span {
  font-family: var(--mono); font-size: 10px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-faint);
  background: var(--paper);
  padding: 4px 10px;
  border: 1px solid var(--rule-strong);
}
.about-aside .portrait {
  aspect-ratio: 4/5;
  position: relative;
  border: 1px solid var(--rule);
  overflow: hidden;
  background: var(--paper-3);
}
.about-aside .portrait img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 20%;
  display: block;
  /* subtle scientific-illustration treatment */
  filter: contrast(1.04) saturate(0.92);
}
.about-aside .portrait::before {
  /* registration crosshair overlay */
  content: "";
  position: absolute; inset: 8px;
  border: 1px solid rgba(255,255,255,0.18);
  pointer-events: none;
  mix-blend-mode: overlay;
}
.about-aside .portrait::after {
  /* tiny corner tick like a contact-sheet frame */
  content: "";
  position: absolute;
  top: 10px; left: 10px;
  width: 12px; height: 12px;
  border-top: 1px solid rgba(255,255,255,0.6);
  border-left: 1px solid rgba(255,255,255,0.6);
  pointer-events: none;
}

/* ---------- Experience ---------- */
.experience h2,
.education h2,
.skills h2,
.contact h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 44px;
  letter-spacing: -0.01em;
  margin-bottom: 48px;
  max-width: 22ch;
}
.experience h2 em, .education h2 em { color: var(--carmine); font-style: italic; }

.timeline {
  position: relative;
  padding-left: 0;
}

.entry {
  display: grid;
  grid-template-columns: 200px 1fr 60px;
  gap: 32px;
  padding: 32px 0;
  border-top: 1px solid var(--rule);
  position: relative;
  transition: background-color .25s;
}
.entry:hover { background: rgba(168, 50, 74, 0.03); }
.entry:last-child { border-bottom: 1px solid var(--rule); }

.entry .when {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-top: 6px;
}
.entry .when .dur { display: block; color: var(--carmine); margin-top: 6px; font-size: 10.5px; }

.entry .body h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.005em;
  margin-bottom: 4px;
}
.entry .body h3 small {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: block;
  margin-top: 6px;
}
.entry .body .org {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--carmine);
  margin-bottom: 14px;
}
.entry .body .org .place::before { content: " · "; color: var(--ink-faint); margin: 0 4px; }
.entry .body p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 64ch;
}
.entry .body ul {
  list-style: none; padding: 0; margin-top: 8px;
  display: flex; flex-direction: column; gap: 6px;
}
.entry .body li {
  font-size: 14.5px;
  color: var(--ink-soft);
  position: relative;
  padding-left: 18px;
  line-height: 1.6;
}
.entry .body li::before {
  content: "";
  position: absolute; left: 0; top: 9px;
  width: 8px; height: 1px; background: var(--carmine);
}

.entry .index {
  font-family: var(--serif);
  font-style: italic;
  font-size: 32px;
  color: var(--ink-faint);
  text-align: right;
  padding-top: 4px;
}

/* ---------- Skills + Education grid ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
}

.edu-card {
  border-top: 1px solid var(--rule);
  padding: 28px 0;
}
.edu-card:last-child { border-bottom: 1px solid var(--rule); }
.edu-card .deg {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  margin-bottom: 4px;
}
.edu-card .deg em { font-style: italic; color: var(--carmine); }
.edu-card .school {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.edu-card .yrs {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  margin-top: 6px;
}

.skill-group { margin-bottom: 28px; }
.skill-group h4 {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--carmine);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}
.skill-list { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-list span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 6px 11px;
  border: 1px solid var(--rule-strong);
  color: var(--ink);
  background: var(--paper-2);
}

/* ---------- Contact ---------- */
.contact {
  text-align: center;
  padding-top: 160px;
  padding-bottom: 160px;
}
.contact .marker { justify-content: center; }
.contact h2 {
  font-size: clamp(48px, 6.5vw, 88px);
  margin: 24px auto 36px;
  max-width: none;
  line-height: 1;
}
.contact h2 em { color: var(--carmine); font-style: italic; }
.contact .email {
  display: inline-block;
  font-family: var(--serif);
  font-size: 28px;
  font-style: italic;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 6px;
  text-decoration: none;
  transition: color .2s, border-color .2s;
}
.contact .email:hover { color: var(--carmine); border-color: var(--carmine); }
.contact .links {
  margin-top: 36px;
  display: flex; gap: 36px; justify-content: center;
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
}
.contact .links a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 3px;
  transition: color .2s, border-color .2s;
}
.contact .links a:hover { color: var(--carmine); border-color: var(--carmine); }

/* ---------- Footer ---------- */
footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--rule);
  padding: 28px 60px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-faint);
  max-width: 1280px;
  margin: 0 auto;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  section { padding: 80px 28px; }
  .topbar { padding: 14px 22px; }
  .topbar .right { display: none; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 100px; }
  .about { grid-template-columns: 1fr; gap: 40px; }
  .about-aside { position: static; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .entry { grid-template-columns: 1fr; gap: 8px; }
  .entry .index { display: none; }
}

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .8s, transform .8s; }
.reveal.in { opacity: 1; transform: none; }