/* ─────────────────────────────────────────────────────────────
   IRoM Lab — site stylesheet
   Design tokens, layout primitives, and component styles.
   ───────────────────────────────────────────────────────────── */

:root {
  /* Palette — classic white / red / black */
  --accent:       #B31B1B;   /* primary red */
  --accent-deep:  #8E1414;   /* hover red */
  --accent-soft:  #FBEAEA;   /* very light red wash */
  --ink:          #111111;
  --ink-soft:     #2a2a2a;
  --slate:        #555555;
  --slate-light:  #888888;
  --line:         #e5e5e5;
  --line-soft:    #f0f0f0;
  --bg:           #ffffff;
  --bg-card:      #ffffff;
  --bg-muted:     #f6f6f6;

  /* Legacy alias names so older rules still resolve */
  --orange:       var(--accent);
  --orange-deep:  var(--accent-deep);
  --orange-soft:  var(--accent-soft);

  /* Type — single sans-serif family throughout for consistency */
  --sans:     "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif:    var(--sans);   /* legacy alias — keeps existing rules working */
  --mono:     "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Sizing */
  --container:  1120px;
  --reading:    760px;
  --gutter:     32px;
  --radius:     6px;
  --radius-lg:  12px;

  /* Motion */
  --t: 180ms cubic-bezier(.2,.7,.3,1);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); }

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}
a:hover { color: var(--orange); border-bottom-color: var(--orange); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0 0 .5em;
  text-wrap: balance;          /* avoid orphan words on the last line */
}
h1 { font-size: clamp(2.2rem, 4vw, 3.4rem); font-weight: 800; letter-spacing: -0.025em; }
h2 { font-size: 1.75rem; margin-top: 2.4em; }
h3 { font-size: 1.25rem; margin-top: 1.6em; }
p  { margin: 0 0 1em; color: var(--ink-soft); }

::selection { background: var(--orange-soft); color: var(--ink); }

/* ─────────── Layout primitives ─────────── */

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.reading {
  max-width: var(--reading);
  margin: 0 auto;
}

main { padding: 56px 0 96px; }
section + section { margin-top: 64px; }

/* ─────────── Header ─────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 250, 247, 0.82);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter:         saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  max-width: 1360px;
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-header__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  border: none;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.005em;
}
.site-header__brand:hover { color: var(--orange); border: none; }
.site-header__brand img { height: 76px; width: auto; display: block; }
.site-header__brand .mark {
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--orange);
  border-radius: 50%;
}

.site-nav {
  margin-left: auto;
  display: flex;
  gap: 4px;
  align-items: center;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--slate);
  font-size: 1.02rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius);
  border: none;
  transition: color var(--t), background var(--t);
}
.site-nav a:hover { color: var(--ink); background: var(--bg-muted); }
.site-nav a.is-active { color: var(--ink); background: var(--orange-soft); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 18px;
}

/* ─────────── Overlay header (home only) ─────────── */
.site-header--overlay {
  position: absolute;
  top: 0; left: 0; right: 0;
  background: transparent;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.site-header--overlay .site-header__brand { color: #fff; }
.site-header--overlay .site-header__brand:hover { color: var(--accent); }
.site-header--overlay .site-nav a {
  color: rgba(255, 255, 255, 0.85);
}
.site-header--overlay .site-nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}
.site-header--overlay .site-nav a.is-active {
  color: #fff;
  background: var(--accent);
}
.site-header--overlay .nav-toggle {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

/* ─────────── Cinematic video hero ─────────── */
.hero-video {
  position: relative;
  min-height: 72vh;
  margin: 20px clamp(32px, 6vw, 80px) 0;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-radius: 20px;
  background: #111;       /* base color while video loads */
  color: #fff;
}
@media (max-width: 700px) {
  .hero-video { margin: 12px 16px 0; border-radius: 14px; }
}
.hero-video__media {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  z-index: 0;
  /* hidden until <video> resolves a source; the no-video class also hides it */
}
.hero-video--no-video .hero-video__media { display: none; }
.hero-video__photo { display: none; }

/* Fallback: a dark red→black gradient with a subtle radial accent when
   no video source has loaded. Looks intentional, not broken. */
.hero-video::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(179, 27, 27, 0.45) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 70%, rgba(60, 60, 60, 0.6) 0%, transparent 60%),
    linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 60%, #2a0a0a 100%);
  z-index: 0;
}
.hero-video__media[poster] { background: transparent; }

/* Dark gradient overlay sits above video, below text, for legibility.
   Heavier on the left where the logo/title live, lighter on the right so
   the video still shows through. Multiple layers so even bright clips
   (white labs, bright lights) don't wash out the headline. */
.hero-video__overlay {
  position: absolute; inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg,
      rgba(0,0,0,0.65) 0%,
      rgba(0,0,0,0.45) 38%,
      rgba(0,0,0,0.20) 70%,
      rgba(0,0,0,0.05) 100%),
    linear-gradient(180deg,
      rgba(0,0,0,0.35) 0%,
      rgba(0,0,0,0.10) 40%,
      rgba(0,0,0,0.45) 100%);
}

.hero-video__content {
  position: relative;
  z-index: 2;
  padding-top: 80px;
  padding-bottom: 80px;
}
.hero-video__eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 24px;
}
.hero-video__eyebrow::before {
  content: ""; width: 36px; height: 2px; background: var(--accent);
}
.hero-video__logo {
  display: block;
  height: 70px;
  width: auto;
  margin-bottom: 28px;
  /* Logo art is dark navy + red on a transparent background. Invert it
     to pure white so it stays legible against the dark video overlay;
     the brand red is already carried by the rest of the page. */
  filter: brightness(0) invert(1) drop-shadow(0 2px 14px rgba(0, 0, 0, 0.55));
  opacity: 0.95;
}
@media (max-width: 700px) {
  .hero-video__logo { height: 52px; margin-bottom: 20px; }
}

/* Arrow video selector — bottom center of the hero */
.hero-video__pager--arrows {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 14px;
}
.hero-arrow {
  appearance: none;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.45);
  background: rgba(0, 0, 0, 0.35);
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.4rem;
  font-family: var(--sans);
  line-height: 1;
  cursor: pointer;
  transition: all var(--t);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  padding: 0 0 2px;        /* nudge glyph up to optical center */
}
.hero-arrow:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: scale(1.06);
}
.hero-pos {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.08em;
  min-width: 3.5em;
  text-align: center;
  text-shadow: 0 1px 6px rgba(0,0,0,0.6);
}
@media (max-width: 700px) {
  .hero-video__pager--arrows { bottom: 16px; gap: 10px; }
  .hero-arrow { width: 36px; height: 36px; font-size: 1.15rem; }
  .hero-pos { font-size: 0.72rem; }
}
.hero-video__title {
  font-family: var(--serif);
  color: #fff;
  font-weight: 800;
  letter-spacing: -0.025em;
  font-size: clamp(2.6rem, 5.5vw, 4.6rem);
  line-height: 1.05;
  margin: 0 0 18px;
  max-width: 900px;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.85), 0 1px 3px rgba(0, 0, 0, 0.6);
  text-wrap: balance;
}
.hero-video__tag {
  font-size: clamp(1rem, 1.4vw, 1.3rem);
  color: rgba(255, 255, 255, 0.95);
  max-width: none;            /* let it run to the natural width */
  margin: 0 0 36px;
  line-height: 1.55;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.85), 0 1px 2px rgba(0, 0, 0, 0.6);
  white-space: nowrap;        /* keep the tagline on a single line */
}
@media (max-width: 760px) {
  /* On narrow screens, single-line nowrap would force scroll; allow wrap */
  .hero-video__tag { white-space: normal; text-wrap: balance; }
}
.hero-video__cta {
  display: flex; flex-wrap: wrap; gap: 12px;
}
.cta {
  display: inline-flex; align-items: center;
  padding: 12px 22px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius);
  border: 1.5px solid transparent;
  transition: all var(--t);
  letter-spacing: 0.01em;
}
.cta--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.cta--primary:hover {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
  color: #fff;
}
.cta--ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
}
.cta--ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
  color: #fff;
}

/* scroll-down indicator removed in favor of bottom-center arrows */

/* Featured research strip */
.featured { margin-top: 64px; }
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.featured-card {
  display: block;
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-muted);
  color: #fff;
  border: 1px solid var(--line);
  transition: transform var(--t), box-shadow var(--t);
}
.featured-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 40px -18px rgba(0, 0, 0, 0.4);
}
.featured-card img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 600ms cubic-bezier(.2,.7,.3,1);
}
.featured-card:hover img { transform: scale(1.05); }
.featured-card__shade {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 30%, rgba(0,0,0,0.85) 100%);
}
.featured-card__body {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 18px 22px;
  color: #fff;
}
.featured-card__eyebrow {
  font-size: 0.7rem; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 4px;
}
.featured-card__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.3;
  margin: 0;
  letter-spacing: -0.005em;
}
@media (max-width: 880px) {
  .featured-grid { grid-template-columns: 1fr; }
}

/* On the home page, the main below-fold area gets a smaller top pad
   because the hero already occupies a lot of vertical space. */
.home main { padding-top: 64px; }

/* News-only home layout */
.home-news { max-width: 900px; }
.home-news .section-title { margin-bottom: 32px; padding-bottom: 16px; }
.news .body .md-item { display: inline-block; padding-left: 1.7em; text-indent: -1.7em; }
.home-news .section-title h2 {
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin: 0;
  letter-spacing: -0.025em;
}
.home-news .news li {
  grid-template-columns: 96px 1fr;
  padding: 18px 0;
  font-size: 1rem;
}
.home-news .news .date { font-size: 0.9rem; padding-top: 4px; }
.home-news .news-more {
  margin-top: 28px;
  display: flex;
  justify-content: center;
}

/* Inverted ghost CTA — looks right on light backgrounds */
.cta--ghost-dark {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
  cursor: pointer;
  font-family: var(--sans);
}
.cta--ghost-dark:hover {
  background: var(--bg-muted);
  border-color: var(--ink);
  color: var(--ink);
}

/* ─────────── Hero (home) ─────────── */

.hero {
  padding: 72px 0 32px;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--slate-light); margin-bottom: 18px;
}
.hero__eyebrow::before {
  content: ""; width: 28px; height: 1px; background: var(--orange);
}
.hero h1 {
  max-width: 900px;
  margin: 0 0 0.55em;
}
.hero__tag {
  font-family: var(--serif);
  font-style: italic;
  color: var(--slate);
  font-size: 1.25rem;
  max-width: 760px;
  margin: 0;
  text-wrap: balance;
}
.hero__meta {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  color: var(--slate);
  font-size: 0.95rem;
}
.hero__meta strong { color: var(--ink); font-weight: 600; }

/* Two-column home layout */
.home-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  margin-top: 72px;
}
@media (max-width: 880px) {
  .home-grid { grid-template-columns: 1fr; gap: 40px; }
}

.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.section-title h2 { margin: 0; font-size: 1.4rem; }
.section-title a {
  font-size: 0.88rem; font-weight: 500;
  color: var(--slate); border: none;
}
.section-title a:hover { color: var(--orange); }

/* ─────────── News list ─────────── */

.news { list-style: none; padding: 0; margin: 0; }
.news li {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.96rem;
  line-height: 1.55;
}
.news li:last-child { border-bottom: none; }
.news li[hidden] { display: none; }
.news .date {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--orange-deep);
  letter-spacing: 0.01em;
  padding-top: 2px;
}
.news .body { color: var(--ink-soft); }
.news .body strong { color: var(--ink); font-weight: 600; }
.news .body p { margin: 0; }

/* ─────────── Publication cards ─────────── */

.year-band {
  display: flex; align-items: baseline; gap: 16px;
  margin: 56px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.year-band h2 {
  font-size: 2.2rem; font-weight: 800;
  margin: 0;
  font-family: var(--serif);
  color: var(--ink);
  letter-spacing: -0.02em;
}
.year-band .count {
  color: var(--slate-light); font-size: 0.85rem;
  font-family: var(--mono);
}

.pub {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
}
.pub:last-child { border-bottom: none; }

.pub__thumb {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-muted);
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
}
.pub__thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 400ms cubic-bezier(.2,.7,.3,1);
}
.pub:hover .pub__thumb img { transform: scale(1.03); }
.pub__thumb--empty {
  background: linear-gradient(135deg, #f7f7f7 0%, #ececec 100%);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.pub__body { min-width: 0; }
.pub__title {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.35;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.pub__title a { color: inherit; border: none; }
.pub__title a:hover { color: var(--orange-deep); }
.pub__authors {
  color: var(--slate);
  font-size: 0.94rem;
  line-height: 1.5;
  margin: 0 0 6px;
}
.pi { color: inherit !important; font-weight: inherit !important; }
.pub__venue {
  font-style: italic;
  color: var(--slate);
  font-size: 0.92rem;
  margin: 0;
}
.pub__venue .year { color: var(--orange-deep); font-style: normal; font-weight: 500; }
.pub__notes { font-size: 0.88rem; color: var(--slate); font-style: italic; margin-top: 4px; }

.pub__awards {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin: 8px 0 0;
}
.award {
  display: inline-flex; align-items: center; gap: 4px;
  background: #FFF3CD;
  color: #8A5A00;
  border: 1px solid #F2D27A;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 3px 8px;
  border-radius: 999px;
}
.award::before { content: "★"; font-size: 0.78em; }

.pub__links {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 10px;
}
.btn {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  background: var(--bg-card);
  transition: background var(--t), color var(--t), border-color var(--t);
  font-family: var(--sans);
}
.btn:hover { color: var(--ink); border-color: var(--ink-soft); background: var(--bg-muted); }
.btn--arxiv {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.btn--arxiv:hover {
  background: var(--accent-deep); border-color: var(--accent-deep); color: #fff;
}
.btn--code {
  background: var(--ink); color: #fff; border-color: var(--ink);
}
.btn--code:hover { background: #000; color: #fff; }
.btn--project {
  background: #4a4a4a; color: #fff; border-color: #4a4a4a;
}
.btn--project:hover { background: #2e2e2e; border-color: #2e2e2e; color: #fff; }
.btn--video {
  background: #8a8a8a; color: #fff; border-color: #8a8a8a;
}
.btn--video:hover { background: #6a6a6a; border-color: #6a6a6a; color: #fff; }
.btn--blog, .btn--journal, .btn--demo, .btn--pdf {
  background: #fff; color: var(--ink-soft); border-color: var(--line);
}
.btn--blog:hover, .btn--journal:hover, .btn--demo:hover, .btn--pdf:hover {
  border-color: var(--ink); color: var(--ink); background: var(--bg-muted);
}

.status-tag {
  display: inline-block;
  background: var(--bg-muted);
  color: var(--slate);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 3px;
  margin-right: 8px;
  vertical-align: middle;
}

/* Compact pub list (homepage / research page) */
.pub--compact { grid-template-columns: 1fr; gap: 4px; padding: 12px 0; }
.pub--compact .pub__thumb { display: none; }
.pub--compact .pub__title { font-size: 1rem; }
.pub--compact .pub__authors { font-size: 0.9rem; }
.pub--compact .pub__links { margin-top: 6px; }

@media (max-width: 700px) {
  .pub { grid-template-columns: 1fr; }
  .pub__thumb { max-width: 280px; }
}

/* ─────────── Filter bar ─────────── */

.filter-bar {
  display: flex; flex-wrap: wrap; gap: 8px;
  align-items: center;
  margin: 12px 0 0;
}
.filter-bar input[type="search"] {
  flex: 1 1 260px;
  min-width: 200px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  font: inherit;
  color: var(--ink);
}
.filter-bar input[type="search"]:focus {
  outline: none; border-color: var(--orange);
  box-shadow: 0 0 0 3px var(--orange-soft);
}
.chip {
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--slate);
  transition: all var(--t);
}
.chip:hover { color: var(--ink); border-color: var(--slate-light); }
.chip.is-on { background: var(--ink); color: #fff; border-color: var(--ink); }

/* ─────────── People grid ─────────── */

.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 28px 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.person {
  display: flex; flex-direction: column;
  align-items: flex-start;
  text-align: left;
}
.person__photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-muted);
  margin-bottom: 12px;
  position: relative;
  border: 1px solid var(--line-soft);
}
.person__photo img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 400ms cubic-bezier(.2,.7,.3,1), filter var(--t);
}
.person:hover .person__photo img { transform: scale(1.04); }
.person__initials {
  position: absolute;
  inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--accent);
  background: linear-gradient(135deg, #f7f7f7 0%, #ececec 100%);
}
.person__name {
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 2px;
  line-height: 1.3;
}
.person__name a { color: inherit; border: none; }
.person__name a:hover { color: var(--orange-deep); }
.person__role {
  font-size: 0.85rem;
  color: var(--slate);
  line-height: 1.4;
  margin: 0;
}
.person__next {
  font-size: 0.78rem;
  color: var(--slate-light);
  margin-top: 2px;
  font-style: italic;
}

/* PI feature card */
.pi-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 36px;
  align-items: start;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 56px;
}
.pi-card__photo {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 1 / 1;
}
.pi-card__photo img { width: 100%; height: 100%; object-fit: cover; }
.pi-card h2 { margin-top: 0; font-size: 1.7rem; }
.pi-card .meta { color: var(--slate); margin: 4px 0; }
.pi-card .meta strong { color: var(--ink); }
.profile-links strong a { margin-right: 16px; }
.profile-links strong a:last-child { margin-right: 0; }
@media (max-width: 700px) {
  .pi-card { grid-template-columns: 1fr; padding: 24px; gap: 20px; }
  .pi-card__photo { max-width: 200px; }
}

/* Profile page (majumdar.html): tighter section spacing than the site default */
#majumdar .pi-card { margin-bottom: 32px; }
#majumdar h2 { margin-top: 1.3em; }

/* Alumni list */
.alumni-section h3 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--slate-light);
  font-family: var(--sans);
  font-weight: 600;
  margin-top: 32px;
}
.alumni-list {
  list-style: none; padding: 0; margin: 0;
  display: grid;
  grid-template-columns: 1fr;   /* one person per line */
  gap: 8px 28px;
}
.alumni-list li { font-size: 0.94rem; color: var(--ink-soft); }
.alumni-list .next {
  color: var(--slate-light); font-size: 0.86rem;
  margin-left: 6px;             /* space between name and destination */
}
.alumni-undergrad {
  color: var(--ink-soft);
  line-height: 1.9;
}
.alumni-undergrad .alum { white-space: normal; }
.alumni-undergrad .next { color: var(--slate-light); font-size: 0.86rem; }

/* ─────────── Research area cards ─────────── */

.research-area {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}
.research-area:first-of-type { border-top: none; padding-top: 12px; }
.research-area__head {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  margin-bottom: 24px;
  align-items: start;
}
.research-area__head h2 { margin: 0; }
.research-area__head .num {
  display: block;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--orange-deep);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.research-area__head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.7;
}
@media (max-width: 800px) {
  .research-area__head { grid-template-columns: 1fr; gap: 8px; }
}
.research-intro, .research-outro {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 760px;
  margin: 0 0 16px;
}
.research-outro { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--line); }
.research-area__sub {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 24px 0 12px;
}
.research-area__more {
  margin: 12px 0 0;
  font-size: 0.9rem;
}
.research-area__more a {
  color: var(--orange-deep);
  border: none;
  font-weight: 500;
}

/* ─────────── Press list ─────────── */
.press-list { list-style: none; padding: 0; margin: 0; }
.press-list li {
  display: grid;
  grid-template-columns: 110px 1fr 200px;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  align-items: baseline;
}
.press-list .date {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--orange-deep);
  letter-spacing: 0.01em;
}
.press-list .title { font-family: var(--serif); font-size: 1.05rem; color: var(--ink); }
.press-list .title a { color: inherit; border: none; }
.press-list .title a:hover { color: var(--orange-deep); }
.press-list .outlet { color: var(--slate); font-size: 0.9rem; font-style: italic; text-align: right; }
@media (max-width: 700px) {
  .press-list li { grid-template-columns: 1fr; gap: 4px; }
  .press-list .outlet { text-align: left; }
}

/* ─────────── Software cards ─────────── */
.repo-org {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 26px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--ink);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color var(--t), border-color var(--t), background var(--t);
}
.repo-org:hover {
  color: var(--ink);
  border-color: var(--ink-soft);
  background: var(--bg-muted);
}
.repo-org__mark { display: flex; }
.repo-org__mark svg { display: block; }
.repo-org__arrow { color: var(--slate-light); font-weight: 500; }

.repo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}
.repo {
  display: block;
  padding: 20px 22px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color var(--t), transform var(--t), box-shadow var(--t);
  color: var(--ink);
}
.repo:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px -10px rgba(231, 117, 0, 0.4);
  color: var(--ink);
}
.repo__name {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--orange-deep);
  margin: 0 0 6px;
  display: flex; align-items: center; gap: 6px;
}
.repo__name::before { content: "▸"; font-size: 0.8em; }
.repo__desc { font-size: 0.92rem; color: var(--slate); margin: 0 0 10px; line-height: 1.5; }
.repo__meta {
  font-size: 0.78rem;
  color: var(--slate-light);
  display: flex; flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.repo__meta .lang { font-family: var(--mono); }
.repo__stars,
.repo__forks {
  display: inline-flex; align-items: center;
  gap: 4px;
  font-weight: 600;
  color: var(--ink-soft);
}
.repo__stars svg,
.repo__forks svg { flex: none; }
.repo__stars:empty,
.repo__forks:empty { display: none; }

/* ─────────── Courses ─────────── */
.course {
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
}
.course__nums {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: 6px;
}
.course__nums code {
  font-family: var(--mono);
  font-size: 0.78rem;
  background: var(--bg-muted);
  padding: 2px 8px;
  border-radius: 3px;
  color: var(--ink-soft);
}
.course__title { font-family: var(--serif); font-size: 1.25rem; margin: 4px 0; }
.course__title a { color: var(--ink); border: none; }
.course__title a:hover { color: var(--orange-deep); }
.course__sem { font-size: 0.88rem; color: var(--slate-light); margin-bottom: 8px; }

/* ─────────── Facilities ─────────── */
.facility {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  margin-bottom: 48px;
}
.facility img { border-radius: var(--radius-lg); }
@media (max-width: 700px) { .facility { grid-template-columns: 1fr; } }

/* ─────────── Footer ─────────── */
.site-footer {
  margin-top: 96px;
  padding: 32px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--slate);
  font-size: 0.88rem;
}
.site-footer .container {
  display: flex; flex-wrap: wrap; gap: 16px;
  justify-content: space-between;
}
.site-footer a { color: var(--slate); border: none; }
.site-footer a:hover { color: var(--orange-deep); }

/* ─────────── Utility ─────────── */
.loading {
  color: var(--slate-light);
  font-style: italic;
  padding: 24px 0;
}
.hidden { display: none !important; }

@media (max-width: 720px) {
  .site-nav { display: none; gap: 0; width: 100%; flex-direction: column; align-items: stretch; padding-top: 12px; }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 10px 12px; border-radius: 0; }
  .nav-toggle { display: inline-block; margin-left: auto; }
  .site-header__inner { flex-wrap: wrap; }
}