/* ── AHGRI Lab — Shared Styles v2 ── */
/* OSU Colors: Orange #DC4405, Black #1a1a1a */

@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --orange:      #DC4405;
  --orange-light: #f05a20;
  --orange-pale: #fff0eb;
  --orange-deep: #b83600;
  --black:       #1a1a1a;
  --dark:        #2a2a2a;
  --mid:         #4a4a4a;
  --gray:        #767676;
  --light-gray:  #e4e0dc;
  --off-white:   #f7f5f2;
  --warm-white:  #faf8f6;
  --white:       #ffffff;
  --pine:        #3b5323;
  --blue:        #006a8e;
  --nav-h:       64px;
  --max-w:       1100px;
  --serif:       'Libre Baskerville', Georgia, serif;
  --sans:        'DM Sans', system-ui, sans-serif;
  --mono:        'JetBrains Mono', monospace;
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg:   0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
  --radius:      8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--sans);
  color: var(--black);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--orange); text-decoration: none; transition: color 0.15s; }
a:hover { text-decoration: underline; }

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

::selection { background: var(--orange-pale); color: var(--orange-deep); }

/* ── NAVBAR ── */
nav#main-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 999;
  height: var(--nav-h);
  background: var(--black);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
  border-bottom: 2px solid var(--orange);
  backdrop-filter: blur(12px);
}

.nav-brand {
  display: flex; align-items: center; gap: 0.65rem;
  text-decoration: none;
}
.nav-brand:hover { text-decoration: none; }
.nav-logo {
  width: 38px; height: 38px;
  flex-shrink: 0;
  border-radius: 4px;
  object-fit: contain;
  background: #fff;
}
.nav-badge {
  background: var(--orange);
  color: var(--white);
  font-family: var(--serif);
  font-weight: 700; font-size: 0.9rem;
  width: 36px; height: 36px;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  letter-spacing: -0.5px;
}
.nav-name {
  font-family: var(--sans);
  font-weight: 600; font-size: 0.88rem;
  color: var(--white); line-height: 1.2;
}
.nav-name small {
  display: block;
  font-weight: 400; font-size: 0.65rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.1em; text-transform: uppercase;
  margin-top: 1px;
}

.nav-links {
  display: flex; align-items: center; gap: 0;
  list-style: none;
}
.nav-links li a {
  display: block;
  color: rgba(255,255,255,0.7);
  font-size: 0.78rem; font-weight: 500;
  padding: 0.4rem 0.7rem;
  letter-spacing: 0.01em;
  transition: color 0.15s;
  white-space: nowrap;
  text-decoration: none;
}
.nav-links li a:hover,
.nav-links li a.active {
  color: var(--orange);
  text-decoration: none;
}

.nav-hamburger {
  display: none;
  background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 4px;
}
.nav-hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--white); border-radius: 2px;
  transition: all 0.3s;
}

/* ── PAGE LAYOUT ── */
main { padding-top: var(--nav-h); min-height: 100vh; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }

/* ── PAGE HERO (inner pages) ── */
.page-hero {
  background: var(--black);
  padding: 4rem 0 3.5rem;
  border-bottom: 3px solid var(--orange);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(220,68,5,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 20% 80%, rgba(220,68,5,0.03) 0%, transparent 50%);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
}
.page-hero p {
  color: rgba(255,255,255,0.5);
  font-size: 0.98rem;
  margin-top: 0.75rem;
  max-width: 560px;
  line-height: 1.7;
}

/* ── SECTION SPACING ── */
.section { padding: 4.5rem 0; }
.section-alt { background: var(--off-white); }

.section-label {
  font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--orange);
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 0.6rem;
}
.section-label::before {
  content: ''; width: 20px; height: 2px;
  background: var(--orange);
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  font-weight: 700; color: var(--black);
  margin-bottom: 0.75rem;
  line-height: 1.2;
}
.section-desc {
  color: var(--gray);
  font-size: 0.95rem; line-height: 1.75;
  max-width: 580px;
  margin-bottom: 2.5rem;
}

/* ── DIVIDER ── */
hr.divider {
  border: none;
  border-top: 1px solid var(--light-gray);
  margin: 0;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.65rem 1.5rem;
  border-radius: 4px;
  font-size: 0.84rem; font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer; border: none;
  transition: all 0.2s;
  text-decoration: none;
  font-family: var(--sans);
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--orange); color: var(--white);
  box-shadow: 0 2px 8px rgba(220,68,5,0.25);
}
.btn-primary:hover { background: var(--orange-light); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(220,68,5,0.3); }
.btn-outline { border: 1.5px solid var(--black); color: var(--black); background: transparent; }
.btn-outline:hover { background: var(--black); color: var(--white); }
.btn-ghost { color: var(--orange); background: var(--orange-pale); border: none; }
.btn-ghost:hover { background: var(--orange); color: var(--white); }

/* ── CARDS ── */
.card {
  background: var(--white);
  border: 1px solid var(--light-gray);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.3s, transform 0.3s;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.card-body { padding: 1.5rem; }
.card-tag {
  display: inline-block;
  font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.2rem 0.6rem; border-radius: 3px;
  margin-bottom: 0.75rem;
}
.tag-orange { background: var(--orange-pale); color: var(--orange); }
.tag-black  { background: rgba(26,26,26,0.07); color: var(--dark); }
.tag-green  { background: rgba(59,83,35,0.1); color: var(--pine); }
.tag-blue   { background: rgba(0,106,142,0.1); color: var(--blue); }

/* ── PERSON CARD ── */
.person-card {
  display: flex; gap: 1.25rem;
  padding: 1.5rem;
  border: 1px solid var(--light-gray);
  border-radius: var(--radius);
  background: var(--white);
  transition: box-shadow 0.25s;
}
.person-card:hover { box-shadow: var(--shadow-sm); }
.person-avatar {
  width: 72px; height: 72px; flex-shrink: 0;
  border-radius: 50%;
  background: var(--black);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif);
  font-size: 1.3rem; font-weight: 700;
  color: var(--orange);
  overflow: hidden;
}
.person-avatar img { width: 100%; height: 100%; object-fit: cover; }
.person-info h3 { font-size: 1rem; font-weight: 600; color: var(--black); margin-bottom: 0.2rem; }
.person-role { font-size: 0.8rem; color: var(--orange); font-weight: 600; margin-bottom: 0.4rem; }
.person-info p { font-size: 0.83rem; color: var(--gray); line-height: 1.6; }

/* ── PI Photo ── */
.pi-photo {
  width: 180px; height: 180px;
  border-radius: 50%;
  background: var(--black);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 3rem; font-weight: 700; color: var(--orange);
  margin-bottom: 1rem;
  overflow: hidden;
  border: 3px solid var(--light-gray);
}
.pi-photo img { width: 100%; height: 100%; object-fit: cover; }

/* ── PUBLICATION ITEM ── */
.pub-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--light-gray);
  display: grid; grid-template-columns: 56px 1fr;
  gap: 1.25rem;
}
.pub-item:last-child { border-bottom: none; }
.pub-year {
  font-family: var(--mono);
  font-size: 0.8rem; color: var(--orange);
  font-weight: 500; padding-top: 2px;
}
.pub-title { font-size: 0.95rem; font-weight: 600; color: var(--black); line-height: 1.45; margin-bottom: 0.3rem; }
.pub-authors { font-size: 0.82rem; color: var(--gray); margin-bottom: 0.3rem; }
.pub-journal { font-size: 0.82rem; font-style: italic; color: var(--mid); margin-bottom: 0.5rem; }
.pub-links { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.pub-link {
  font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.07em; text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--light-gray);
  border-radius: 3px; color: var(--mid);
  transition: all 0.15s;
}
.pub-link:hover { border-color: var(--orange); color: var(--orange); text-decoration: none; }

/* ── PROJECT ITEM ── */
.project-item {
  padding: 1.75rem;
  border: 1px solid var(--light-gray);
  border-radius: var(--radius);
  background: var(--white);
  border-left: 4px solid var(--orange);
  transition: box-shadow 0.25s;
  margin-bottom: 1rem;
}
.project-item:hover { box-shadow: var(--shadow-sm); }
.project-item h3 { font-size: 1rem; font-weight: 600; color: var(--black); margin-bottom: 0.4rem; }
.project-item p { font-size: 0.88rem; color: var(--gray); line-height: 1.65; }
.project-meta {
  display: flex; gap: 1rem; margin-top: 0.75rem;
  flex-wrap: wrap;
}
.project-meta span {
  font-size: 0.75rem; color: var(--gray);
  display: flex; align-items: center; gap: 0.3rem;
}

/* ── NEWS ITEM ── */
.news-item {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 1.5rem;
}
.news-card {
  border: 1px solid var(--light-gray); border-radius: var(--radius);
  overflow: hidden; background: var(--white);
  transition: box-shadow 0.3s, transform 0.3s;
}
.news-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.news-thumb {
  height: 140px; background: var(--black);
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.news-thumb::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(220,68,5,0.08) 0%, transparent 70%);
}
.news-thumb img { width: 100%; height: 100%; object-fit: cover; position: relative; z-index: 1; }
.news-thumb-text {
  font-family: var(--serif); font-size: 2rem; color: var(--orange); opacity: 0.3;
  position: relative; z-index: 1;
}
.news-card .card-body { padding: 1.25rem; }
.news-date {
  font-size: 0.72rem; color: var(--gray); text-transform: uppercase;
  letter-spacing: 0.08em; font-weight: 600; margin-bottom: 0.5rem;
}
.news-card h3 { font-size: 0.93rem; font-weight: 600; line-height: 1.4; color: var(--black); margin-bottom: 0.5rem; }
.news-card p { font-size: 0.83rem; color: var(--gray); line-height: 1.6; }

/* ── GRANT ROW ── */
.grant-row {
  display: grid;
  grid-template-columns: 90px 1fr 120px;
  gap: 1.25rem; align-items: start;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--light-gray);
}
.grant-row:last-child { border-bottom: none; }
.grant-yr {
  font-family: var(--mono);
  font-size: 0.78rem; color: var(--orange);
  font-weight: 500; padding-top: 2px;
}
.grant-row h3 { font-size: 0.95rem; font-weight: 600; color: var(--black); margin-bottom: 0.3rem; }
.grant-row p { font-size: 0.83rem; color: var(--gray); }
.grant-amt {
  font-size: 1rem; font-weight: 700;
  color: var(--orange); text-align: right;
  font-family: var(--serif);
  white-space: nowrap;
}
.grant-amt small {
  display: block; font-family: var(--sans);
  font-size: 0.7rem; color: var(--gray); font-weight: 400;
}

/* ── COURSE CARD ── */
.course-card {
  border: 1px solid var(--light-gray);
  border-radius: var(--radius); padding: 1.5rem;
  background: var(--white);
  transition: box-shadow 0.25s;
}
.course-card:hover { box-shadow: var(--shadow-sm); }
.course-code {
  font-family: var(--mono); font-size: 0.76rem;
  color: var(--orange); font-weight: 500; margin-bottom: 0.4rem;
}
.course-card h3 { font-size: 1rem; font-weight: 600; color: var(--black); margin-bottom: 0.6rem; }
.course-card p { font-size: 0.87rem; color: var(--gray); line-height: 1.65; }
.course-tags { display: flex; gap: 0.5rem; margin-top: 0.9rem; flex-wrap: wrap; }
.course-tags span {
  font-size: 0.7rem; padding: 0.2rem 0.55rem;
  background: var(--off-white); color: var(--gray);
  border-radius: 3px; font-weight: 500;
}

/* ── SOFTWARE CARD ── */
.software-card {
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius); padding: 1.75rem;
  background: var(--black); color: var(--white);
  position: relative; overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}
.software-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at 80% 20%, rgba(220,68,5,0.06) 0%, transparent 60%);
  pointer-events: none;
}
.software-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.software-card h3 { font-size: 1rem; font-weight: 600; color: var(--white); margin: 0.75rem 0 0.5rem; position: relative; }
.software-card p { font-size: 0.85rem; color: rgba(255,255,255,0.5); line-height: 1.65; position: relative; }
.software-icon { font-size: 1.5rem; position: relative; }
.software-link { display: inline-block; margin-top: 1rem; font-size: 0.8rem; font-weight: 600; color: var(--orange); letter-spacing: 0.04em; position: relative; }
.software-link:hover { color: var(--orange-light); text-decoration: none; }

/* ── GALLERY GRID ── */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}
.gallery-cell {
  aspect-ratio: 4/3;
  border-radius: 6px; overflow: hidden;
  background: var(--dark);
  display: flex; align-items: center; justify-content: center;
  position: relative; cursor: pointer;
}
.gallery-cell:first-child { grid-column: span 2; aspect-ratio: 16/9; }
.gallery-cell-inner {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 1.5rem; color: rgba(220,68,5,0.25);
  background: linear-gradient(135deg, #1a1a1a, #252525);
  transition: transform 0.4s; position: relative;
  overflow: hidden;
}
.gallery-cell-inner img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.4s;
}
.gallery-cell:hover .gallery-cell-inner,
.gallery-cell:hover .gallery-cell-inner img { transform: scale(1.04); }
.gallery-label {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 0.65rem 0.85rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: rgba(255,255,255,0.9); font-size: 0.75rem; font-weight: 500;
  transform: translateY(100%); transition: transform 0.3s;
}
.gallery-cell:hover .gallery-label { transform: translateY(0); }

/* ── FOOTER ── */
footer {
  background: #111;
  padding: 3.5rem 0 1.5rem;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem; padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-brand h3 {
  font-family: var(--serif);
  font-size: 1.1rem; font-weight: 700;
  color: var(--white); margin-bottom: 0.25rem;
}
.footer-brand .tagline {
  font-size: 0.72rem; color: var(--orange);
  letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 1rem;
}
.footer-brand p { font-size: 0.82rem; color: rgba(255,255,255,0.35); line-height: 1.8; }
.footer-col h4 {
  font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--orange); margin-bottom: 0.9rem;
}
.footer-col a {
  display: block; color: rgba(255,255,255,0.4);
  font-size: 0.82rem; margin-bottom: 0.45rem; transition: color 0.15s;
}
.footer-col a:hover { color: var(--white); text-decoration: none; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 1.25rem;
  font-size: 0.76rem; color: rgba(255,255,255,0.2);
}
.footer-bottom a { color: rgba(255,255,255,0.3); }

/* ── STAT ROW ── */
.stat-row {
  display: flex; gap: 0;
  border-top: 1px solid var(--light-gray);
  border-bottom: 1px solid var(--light-gray);
}
.stat-cell {
  flex: 1; padding: 1.75rem 1.5rem;
  border-right: 1px solid var(--light-gray);
  text-align: center;
}
.stat-cell:last-child { border-right: none; }
.stat-num {
  font-family: var(--serif); font-size: 2rem; font-weight: 700;
  color: var(--orange); display: block;
}
.stat-label {
  font-size: 0.73rem; color: var(--gray);
  text-transform: uppercase; letter-spacing: 0.08em; font-weight: 500;
}

/* ── HOME HERO ── */
.home-hero {
  background: var(--black);
  padding: 6rem 0 0;
  position: relative; overflow: hidden;
}
.home-hero::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse at 70% 30%, rgba(220,68,5,0.07) 0%, transparent 50%),
    radial-gradient(ellipse at 30% 70%, rgba(220,68,5,0.04) 0%, transparent 40%);
  pointer-events: none;
}
.home-hero .container { position: relative; z-index: 1; }
.home-hero-inner {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 3rem; align-items: center; padding-bottom: 4rem;
}
.home-hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(220,68,5,0.12);
  border: 1px solid rgba(220,68,5,0.25);
  color: var(--orange); font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  padding: 0.3rem 0.85rem; border-radius: 100px;
  margin-bottom: 1.5rem;
}
.home-hero-badge::before {
  content: ''; width: 5px; height: 5px;
  background: var(--orange); border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.4;transform:scale(.7)} }
.home-hero h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 700; color: var(--white);
  line-height: 1.1; margin-bottom: 0.3rem;
}
.home-hero h1 em { font-style: normal; color: var(--orange); display: block; }
.home-hero-sub {
  color: rgba(255,255,255,0.35); font-size: 0.82rem;
  letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 1.5rem;
}
.home-hero p {
  color: rgba(255,255,255,0.6); font-size: 0.98rem;
  line-height: 1.75; max-width: 480px; margin-bottom: 2rem;
}
.home-hero-btns { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.home-hero-img {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #1e1e1e, #252525);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 4rem; color: rgba(220,68,5,0.15);
  border: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
  position: relative;
}
.home-hero-img img {
  width: 100%; height: 100%; object-fit: cover;
  position: absolute; top: 0; left: 0;
}

/* ── GRIDS ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }

/* ── BREADCRUMB ── */
.breadcrumb {
  font-size: 0.78rem; color: var(--gray); padding: 0.75rem 0;
  display: flex; align-items: center; gap: 0.4rem;
}
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--orange); text-decoration: none; }
.breadcrumb span { color: rgba(255,255,255,0.2); }

/* ── OSU AFFILIATION BANNER ── */
.osu-banner {
  background: var(--off-white);
  border-top: 3px solid var(--orange);
  padding: 0.6rem 0;
  text-align: center;
  font-size: 0.75rem; color: var(--gray);
  letter-spacing: 0.05em;
}
.osu-banner a { color: var(--orange); }

/* ── INLINE HIGHLIGHT BOX ── */
.highlight-box {
  background: var(--orange-pale);
  border-left: 3px solid var(--orange);
  border-radius: 0 6px 6px 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.highlight-box p { font-size: 0.9rem; color: var(--dark); line-height: 1.7; }
.highlight-box strong { color: var(--orange); }

/* ── IMAGE INSTRUCTIONS (for dev only — can remove) ── */
.img-placeholder {
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1e1e1e, #252525);
  color: rgba(220,68,5,0.2);
  font-family: var(--serif);
  font-size: 2rem;
  width: 100%; height: 100%;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .grid-3, .news-item { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .home-hero-inner { grid-template-columns: 1fr; }
  .home-hero-img { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grant-row { grid-template-columns: 1fr; }
  .grant-amt { text-align: left; }
  .nav-links {
    display: none; flex-direction: column;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--black); padding: 1rem; gap: 0;
    border-bottom: 2px solid var(--orange);
  }
  .nav-links.open { display: flex; }
  .nav-hamburger { display: flex; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .gallery-cell:first-child { grid-column: span 2; }
  /* PI section responsive */
  .pi-grid { grid-template-columns: 1fr !important; text-align: center; }
  .pi-grid > div:first-child { display: flex; flex-direction: column; align-items: center; }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4, .news-item { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .stat-row { flex-wrap: wrap; }
  .stat-cell { min-width: 50%; }
  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-cell:first-child { grid-column: span 1; }
  .pub-item { grid-template-columns: 1fr; }
  .pi-edu-grid { grid-template-columns: 1fr !important; }
}