/* Palette: fresh spring lime fading from near-white at the top, leaf-green links */
:root {
  --paper: #FAFDF2;
  --ink: #232A26;
  --muted: #62676D;
  --accent: #2B7048;
  --line: #E8F1D7;
  --photo: #26292C;
  --display: "Newsreader", Georgia, serif;
  --serif: "Newsreader", Georgia, serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper) linear-gradient(180deg, #FEFFFC 0, var(--paper) 70vh) fixed; color: var(--ink); font: 18px/1.7 var(--serif); }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.page { max-width: 72rem; margin: 0 auto; padding: 2rem clamp(1rem, 4vw, 3rem) 3rem; }

/* Header */
.site-header { min-height: 2.9rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem 2rem; font: 500 1.22rem var(--display); }
.mark { font-weight: 500; color: var(--ink); text-decoration: none; }
.monogram { display: inline-block; width: 2.9rem; height: 2.9rem; line-height: 0; }
.monogram img { width: 100%; height: 100%; display: block; transition: filter .15s; }
.monogram:hover img { filter: brightness(.88); }
.site-header nav { display: flex; flex-wrap: wrap; gap: 0.35rem 1.4rem; }
.site-header nav a { color: var(--ink); text-decoration: none; border-bottom: 1px solid transparent; }
.site-header nav a:hover, .site-header nav a[aria-current] { color: var(--accent); border-color: var(--accent); }

/* Home page intro: full Bengali name contracts into the monogram (once per visit) */
.site-header { position: relative; }
.monogram { position: relative; z-index: 2; }
.intro-name { display: none; position: absolute; left: 0; top: 50%; height: 1.17rem; width: auto; transform-origin: 0 50%;
  transform: translateY(-50%); pointer-events: none; z-index: 3; overflow: visible; }
.intro-name .f { fill: var(--accent); }
html.play .intro-name { display: block; animation: shrink .8s cubic-bezier(.6, 0, .25, 1) 1.6s forwards; }
html.play .monogram img { opacity: 0; transform: scale(.55); animation: appear .5s ease-out 2s forwards; }
@keyframes shrink { to { transform: translate(0.3rem, -50%) scale(.55); opacity: 0; } }
@keyframes appear { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  html.play .intro-name { display: none; }
  html.play .monogram img { animation: none; opacity: 1; transform: none; }
}

/* Home */
.intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.9fr); gap: clamp(2rem, 5vw, 4.5rem); margin-top: 4.5rem; align-items: start; }
.photo { background: var(--photo); overflow: hidden; aspect-ratio: 4 / 5; max-height: 29rem; }
.photo img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 22%; display: block; }
.intro h1 { font: 500 clamp(2.4rem, 4.6vw, 3.8rem)/1.05 var(--display); letter-spacing: -0.01em; margin: 0.4rem 0 0.9rem; }
.role { font-weight: 600; color: var(--accent); }
.intro h1 { margin-bottom: 2.6rem; }
.bio p { margin: 0 0 1.15rem; text-align: justify; }
.links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; font: 500 0.95rem var(--display); border-top: 1px solid var(--line); padding-top: 1.1rem; margin-top: 2rem; }

/* Selected papers */
.selected { margin-top: 4.5rem; }
.content .selected h2 { font: 500 1.45rem var(--display); margin: 0 0 1.25rem; padding: 0; border: 0; }
.papers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.5rem; }
.papers article { border-top: 3px solid var(--accent); padding-top: 1rem; }
.selected .papers h3 { font: 500 1.1rem/1.35 var(--display); margin: 0 0 0.4rem; }
.papers h3 a { color: var(--ink); text-decoration: none; }
.papers h3 a:hover { color: var(--accent); text-decoration: underline; }
.papers .venue { font-size: 0.9rem; color: var(--muted); margin: 0 0 0.6rem; }
.papers p { margin: 0; font-size: 0.98rem; line-height: 1.6; }
.selected .all { margin-top: 1.75rem; font-size: 0.95rem; }

/* Inner pages */
.inner .content { margin-top: 3.5rem; }
.inner h1 { font: 500 clamp(2.3rem, 4.2vw, 3.3rem)/1.1 var(--display); letter-spacing: -0.01em; margin: 0 0 1.5rem; }
.content h2 { font: 500 1.45rem var(--display); margin: 2.75rem 0 1rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--line); }
.content h3 { font: 500 1.15rem/1.4 var(--display); margin: 1.75rem 0 0.25rem; }
.content ol, .content ul { padding-left: 1.3rem; }
.content li { margin-bottom: 1.1rem; }
.content li > ul { list-style: none; padding-left: 0; margin: 0.2rem 0 0; font: 0.85rem/1.5 var(--display); color: var(--muted); }
.content li > ul li { margin: 0; }
.content li > ul a { color: var(--muted); }
.content li > ul a:hover { color: var(--accent); }
.meta { font: 0.88rem/1.5 var(--display); color: var(--muted); margin: 0.15rem 0 0; }
.grant { margin-bottom: 1.6rem; }
.content h2.item { font: 500 1.15rem/1.4 var(--display); margin: 1.75rem 0 0.25rem; padding: 0; border: 0; }
.grant h2.item { margin-bottom: 0.2rem; }

/* Section links on long pages */
.jump { display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; font-size: 1em; font-weight: bold; margin: -0.5rem 0 0; }
.content h2[id] { scroll-margin-top: 1.5rem; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* Footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 5rem; padding-top: 1rem; font: 0.85rem/1.6 var(--display); color: var(--muted); }
.site-footer a { margin-left: 1rem; }

@media (max-width: 760px) {
  .intro { grid-template-columns: 1fr; margin-top: 2.5rem; }
  .photo { max-width: 17rem; margin: 0 auto; width: 100%; }
  .papers { grid-template-columns: 1fr; gap: 1.75rem; }
  .site-footer a { margin: 0 1rem 0 0; display: inline-block; }
}