/* =========================================================
   Samik Bose — personal site
   Palette + type tokens
   ========================================================= */
:root {
  --ink:       #1a211d;
  --muted:     #5c655f;
  --faint:     #8b938c;
  --paper:     #ffffff;
  --paper-2:   #f6f7f5;
  --line:      #e4e7e3;
  --green:     #1c5b3a;
  --green-700: #143f28;
  --green-100: #e8f1ec;

  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --sans:  "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --wrap: 940px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-700); text-decoration: underline; text-underline-offset: 2px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- Navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.88);
  backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--wrap); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 62px; gap: 18px; flex-wrap: wrap;
}
.nav__brand {
  font-family: var(--serif); font-weight: 600; font-size: 1.15rem;
  letter-spacing: 0.2px; color: var(--ink);
}
.nav__brand:hover { color: var(--green); text-decoration: none; }
.nav__links { display: flex; gap: 22px; flex-wrap: wrap; align-items: center; }
.nav__links a {
  font-size: 0.92rem; font-weight: 500; color: var(--muted);
  letter-spacing: 0.2px;
}
.nav__links a:hover { color: var(--green); text-decoration: none; }
.nav__links a.cv {
  color: var(--green); border: 1px solid var(--green);
  padding: 5px 12px; border-radius: 999px;
}
.nav__links a.cv:hover { background: var(--green); color: #fff; }

/* ---------- Shared bits ---------- */
.eyebrow {
  font-family: var(--sans); font-size: 0.74rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--green);
  margin: 0 0 0.6rem;
}
.section { padding: 64px 0; border-top: 1px solid var(--line); }
.section:first-of-type { border-top: none; }
.section--alt { background: var(--paper-2); }
.section__title {
  font-family: var(--serif); font-weight: 600; font-size: 1.9rem;
  line-height: 1.2; margin: 0 0 1.1rem; letter-spacing: -0.01em;
}
h3, h4, h5 { font-family: var(--serif); font-weight: 600; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; background: var(--paper-2); }
.hero__net {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; opacity: 0.5;
}
.hero__inner {
  position: relative; max-width: var(--wrap); margin: 0 auto;
  padding: 72px 24px 64px; display: flex; gap: 48px; align-items: center;
}
.hero__photo img {
  width: 210px; height: 210px; object-fit: cover;
  border-radius: 14px; border: 1px solid var(--line);
  box-shadow: 0 14px 40px rgba(20,63,40,0.14);
}
.hero__intro { flex: 1; min-width: 0; }
.hero__name {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.4rem, 6vw, 3.4rem); line-height: 1.02;
  margin: 0.1rem 0 0.5rem; letter-spacing: -0.02em;
}
.hero__role { font-size: 1.18rem; font-weight: 600; margin: 0 0 0.35rem; }
.hero__affil { color: var(--muted); margin: 0 0 0.9rem; }
.hero__contact { margin: 0 0 1.4rem; font-size: 0.96rem; }
.hero__contact .dot { color: var(--faint); margin: 0 8px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-block; padding: 11px 20px; border-radius: 999px;
  font-size: 0.92rem; font-weight: 600; letter-spacing: 0.2px;
  transition: all 0.15s ease;
}
.btn--solid { background: var(--green); color: #fff; border: 1px solid var(--green); }
.btn--solid:hover { background: var(--green-700); border-color: var(--green-700); color: #fff; text-decoration: none; }
.btn--ghost { background: transparent; color: var(--green); border: 1px solid var(--line); }
.btn--ghost:hover { border-color: var(--green); background: var(--green-100); text-decoration: none; }

/* ---------- Research ---------- */
.project { margin: 0 0 40px; }
.project:last-child { margin-bottom: 0; }
.project__tag {
  display: inline-block; font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--green);
  background: var(--green-100); padding: 3px 10px; border-radius: 999px;
  margin-bottom: 0.7rem;
}
.project__title { font-size: 1.18rem; line-height: 1.35; margin: 0 0 0.4rem; font-family: var(--serif); }
.project__sub { color: var(--muted); font-size: 0.96rem; margin: 0 0 1rem; }

figure { margin: 1.2rem 0 0; }
figure img { border-radius: var(--radius); border: 1px solid var(--line); display: block; }
figcaption { margin-top: 0.7rem; font-size: 0.86rem; color: var(--muted); line-height: 1.55; text-align: justify; }

.future {
  border-left: 3px solid var(--green); background: var(--green-100);
  padding: 14px 18px; border-radius: 0 8px 8px 0; margin: 14px 0;
}
.future strong { color: var(--green-700); }

.keywords { margin-top: 28px; font-size: 0.95rem; color: var(--muted); }
.keywords strong { color: var(--ink); }

/* ---------- Publications ---------- */
.pubs { list-style: none; counter-reset: pub; padding: 0; margin: 0; }
.pubs li {
  counter-increment: pub; position: relative;
  padding: 14px 0 14px 44px; border-bottom: 1px solid var(--line);
  font-size: 0.97rem; line-height: 1.55;
}
.pubs li:last-child { border-bottom: none; }
.pubs li::before {
  content: counter(pub); position: absolute; left: 0; top: 14px;
  font-family: var(--serif); font-size: 0.95rem; font-weight: 600;
  color: var(--green); width: 30px; text-align: right;
}
.pubs em { color: var(--ink); font-style: italic; }
.pubs .venue { color: var(--muted); }
.pubs .badge {
  display: inline-block; font-size: 0.72rem; font-weight: 600;
  color: var(--green-700); background: var(--green-100);
  padding: 1px 8px; border-radius: 999px; margin-left: 4px; white-space: nowrap;
}
.pubs-more { margin-top: 22px; font-weight: 600; }

/* ---------- Teaching ---------- */
.teach { display: grid; gap: 14px; }
.teach__item {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; background: var(--paper);
}
.teach__item h4 { margin: 0 0 0.25rem; font-size: 1.05rem; }
.teach__meta { color: var(--muted); font-size: 0.9rem; }

/* ---------- Contact / socials ---------- */
.socials { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.socials a {
  border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px; font-size: 0.9rem; font-weight: 500; color: var(--ink);
}
.socials a:hover { border-color: var(--green); color: var(--green); text-decoration: none; }

/* ---------- News page ---------- */
.page-head { background: var(--paper-2); border-bottom: 1px solid var(--line); }
.page-head .wrap { padding-top: 54px; padding-bottom: 40px; }
.page-head h1 { font-family: var(--serif); font-size: 2.3rem; margin: 0; letter-spacing: -0.01em; }
.page-head p { color: var(--muted); margin: 0.5rem 0 0; }

/* Flashy news header (news page only) */
.page-head--news {
  background: linear-gradient(120deg, #14402a 0%, #1c5b3a 45%, #2c8f76 100%);
  border-bottom: none; position: relative; overflow: hidden;
}
.page-head--news::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 12% 20%, rgba(255,255,255,0.16) 0 2px, transparent 3px),
    radial-gradient(circle at 78% 30%, rgba(255,255,255,0.12) 0 2px, transparent 3px),
    radial-gradient(circle at 55% 75%, rgba(255,255,255,0.10) 0 2px, transparent 3px),
    radial-gradient(circle at 90% 80%, rgba(255,255,255,0.12) 0 2px, transparent 3px);
  pointer-events: none;
}
.page-head--news h1 { color: #fff; position: relative; }
.page-head--news p  { color: rgba(255,255,255,0.82); position: relative; }
.eyebrow--light { color: #9fe6c6; }

/* Timeline */
.timeline { position: relative; padding-left: 30px; margin-top: 8px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 14px; bottom: 10px; width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--green) 0%, #2c8f76 50%, var(--green-100) 100%);
}
.tl-year {
  position: relative; display: inline-block; margin: 30px 0 14px -30px;
  padding: 6px 18px 6px 34px; font-family: var(--serif); font-weight: 600;
  font-size: 1.1rem; color: #fff; border-radius: 999px;
  background: linear-gradient(120deg, var(--green), #2c8f76);
  box-shadow: 0 6px 18px rgba(20,63,40,0.22);
}
.tl-year::before {
  content: ""; position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 12px; height: 12px; border-radius: 50%; background: #fff;
  box-shadow: 0 0 0 4px rgba(44,143,118,0.35);
}
.tl-list { list-style: none; padding: 0; margin: 0 0 8px; }
.tl-item {
  position: relative; background: var(--paper); border: 1px solid var(--line);
  border-radius: 12px; padding: 15px 18px; margin: 0 0 12px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.tl-item:hover {
  transform: translateX(3px); border-color: #bfe3d2;
  box-shadow: 0 10px 26px rgba(20,63,40,0.10);
}
.tl-item::before {
  content: ""; position: absolute; left: -27px; top: 20px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--green); border: 2px solid #fff;
  box-shadow: 0 0 0 3px var(--green-100);
}
.tl-item p { margin: 0; line-height: 1.6; }
.tl-item .pin { color: var(--green-700); }

/* Category pills */
.tag {
  display: inline-block; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.04em; padding: 3px 10px; border-radius: 999px;
  margin-bottom: 8px;
}
.tag--paper     { color: #15643f; background: #e0f1e8; }
.tag--grant     { color: #8a5a00; background: #fbeccb; }
.tag--talk      { color: #14566b; background: #d8eef5; }
.tag--people    { color: #5b3a8e; background: #ece1f7; }
.tag--milestone { color: #555c63; background: #e8ebee; }

/* ---------- Gallery page ---------- */
.gallery-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px; margin-top: 8px;
}
.gallery-card {
  border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  background: var(--paper); transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.gallery-card:hover { transform: translateY(-4px); box-shadow: 0 14px 32px rgba(20,63,40,0.12); }
.gallery-card img { display: block; width: 100%; height: 220px; object-fit: cover; }
.gallery-card figcaption {
  padding: 12px 14px; margin: 0; font-size: 0.9rem; color: var(--muted);
  text-align: left; line-height: 1.5;
}
.gallery-empty {
  border: 1px dashed var(--line); border-radius: 14px; padding: 40px;
  text-align: center; color: var(--muted); background: var(--paper-2);
}

/* ---------- Research accomplishments page ---------- */
.doc { padding: 48px 0 72px; }
.doc h2 {
  font-family: var(--serif); font-size: 1.55rem; margin: 40px 0 10px;
  padding-bottom: 6px; border-bottom: 1px solid var(--line);
}
.doc h3 { font-size: 1.12rem; margin: 26px 0 8px; color: var(--green-700); }
.doc h4 { font-size: 1rem; margin: 18px 0 6px; }
.doc p { line-height: 1.7; }
.doc .refs { font-size: 0.9rem; color: var(--muted); padding-left: 18px; }
.doc .refs li { margin-bottom: 6px; }
.doc .appointments p { margin: 0.35rem 0; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line); background: var(--paper-2);
  padding: 32px 0; color: var(--muted); font-size: 0.88rem;
}
.footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer a { color: var(--muted); }
.footer a:hover { color: var(--green); }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 16px; }
  .hero__inner { flex-direction: column; text-align: center; gap: 28px; padding-top: 48px; }
  .hero__actions { justify-content: center; }
  .hero__contact .dot { display: none; }
  .hero__contact a { display: block; margin: 2px 0; }
  .nav__inner { min-height: 56px; }
  .nav__links { gap: 14px; }
  .section { padding: 48px 0; }
  figcaption { text-align: left; }
}

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