/* ================================================================
   GAMMA Lab — Shared Stylesheet | "Quiet Authority"
   University of Maryland · Dept. of Computer Science
   ================================================================ */

/* ── Fonts ─────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,wght@0,300;0,400;0,500;1,300;1,400&display=swap');
@import url('https://api.fontshare.com/v2/css?f[]=general-sans@300,400,500,600&display=swap');

/* ── Theme tokens ─────────────────────────────────────────────── */
[data-theme="dark"] {
  --bg:           #09090C;
  --sf1:          #0F0F13;
  --sf2:          #16161B;
  --sf3:          #1E1E24;
  --t1:           #E0DDD6;
  --t2:           #908D85;
  --t3:           #5C5A53;
  --accent:       #D4A843;
  --accent-sub:   rgba(212, 168, 67, 0.09);
  --accent-sub2:  rgba(212, 168, 67, 0.16);
  --border:       rgba(255, 255, 255, 0.055);
  --border2:      rgba(255, 255, 255, 0.10);
  --nav-bg:       rgba(9, 9, 12, 0.88);
  --card-bg:      #0F0F13;
  --shadow:       0 4px 32px rgba(0, 0, 0, 0.5);
  --shadow-sm:    0 2px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
  --bg:           #F6F4F0;
  --sf1:          #EDEAE4;
  --sf2:          #E3E0D9;
  --sf3:          #D8D5CE;
  --t1:           #1A1917;
  --t2:           #5A5850;
  --t3:           #8A8780;
  --accent:       #C22828;
  --accent-sub:   rgba(194, 40, 40, 0.07);
  --accent-sub2:  rgba(194, 40, 40, 0.13);
  --border:       rgba(0, 0, 0, 0.065);
  --border2:      rgba(0, 0, 0, 0.12);
  --nav-bg:       rgba(246, 244, 240, 0.90);
  --card-bg:      #FFFFFF;
  --shadow:       0 4px 32px rgba(0, 0, 0, 0.10);
  --shadow-sm:    0 2px 12px rgba(0, 0, 0, 0.06);
}

/* ── Reset & base ─────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'General Sans', system-ui, -apple-system, sans-serif;
  font-weight: 300;
  font-size: 15px;
  line-height: 1.8;
  background: var(--bg);
  color: var(--t1);
  transition: background 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* ── Transitions on theme change ──────────────────────────────── */
.nav, .paper-card, .area-cell, .person-card, .pi-card,
.event-card, .paper-row, .paper-expand, .footer {
  transition: background 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

/* ── Typography utilities ─────────────────────────────────────── */
.serif {
  font-family: 'Newsreader', Georgia, 'Times New Roman', serif;
}

.section-label {
  font-family: 'General Sans', sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--t3);
  display: block;
  margin-bottom: 36px;
}

/* ── Navigation ───────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 60px;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-logo {
  font-family: 'General Sans', sans-serif;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--t1);
  text-transform: uppercase;
  transition: color 0.35s ease;
}

.nav-logo span { color: var(--accent); }

.nav-sep {
  width: 1px;
  height: 16px;
  background: var(--border2);
  flex-shrink: 0;
}

.nav-umd {
  font-size: 12px;
  font-weight: 400;
  color: var(--t3);
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}
.nav-umd:hover { color: var(--t2); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 13px;
  font-weight: 400;
  color: var(--t2);
  padding: 6px 12px;
  border-radius: 6px;
  transition: color 0.2s ease, background 0.2s ease;
  letter-spacing: 0.01em;
}
.nav-link:hover  { color: var(--t1); background: var(--sf2); }
.nav-link.active { color: var(--accent); font-weight: 500; }

.theme-toggle {
  margin-left: 8px;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--t2);
  border: 1px solid var(--border);
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--t1);
  background: var(--accent-sub);
  border-color: var(--accent);
}
.theme-toggle svg { width: 15px; height: 15px; flex-shrink: 0; }

/* Mobile */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: 8px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--t1);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav-mobile-menu {
  display: none;
  position: fixed;
  top: 60px; left: 0; right: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px 20px;
  flex-direction: column;
  gap: 2px;
  z-index: 99;
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-menu .nav-link { font-size: 15px; padding: 10px 12px; }

/* ── Container ────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ── Section base ─────────────────────────────────────────────── */
section { padding: 96px 0; }
section + section { border-top: 1px solid var(--border); }

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

.hero-text {
  padding: 72px 48px 72px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 600px;
}

.hero-overline {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.hero-overline::before {
  content: '';
  display: block;
  width: 28px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

.hero-title {
  font-family: 'Newsreader', Georgia, serif;
  font-size: clamp(32px, 4.2vw, 54px);
  font-weight: 300;
  line-height: 1.16;
  color: var(--t1);
  margin-bottom: 28px;
  letter-spacing: -0.025em;
}
.hero-title strong { font-weight: 500; }
.hero-title em     { font-style: italic; font-weight: 300; }

.hero-desc {
  font-size: 15px;
  font-weight: 300;
  color: var(--t2);
  line-height: 1.85;
  margin-bottom: 36px;
  max-width: 460px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.action-pill {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--t1);
  padding: 8px 18px;
  border: 1px solid var(--border2);
  border-radius: 100px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.action-pill:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-sub);
}
.action-pill.primary {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-sub);
}
.action-pill.primary:hover { background: var(--accent-sub2); }

.hero-pill-groups {
  margin-top: 0;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.hero-pill-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.hero-pill-label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--t3);
}
.hero-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.resource-pill {
  font-size: 11px;
  font-weight: 500;
  color: var(--t2);
  padding: 5px 13px;
  border: 1px solid var(--border2);
  border-radius: 100px;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  white-space: nowrap;
  line-height: 1;
}
.resource-pill:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-sub);
}

.hero-canvas-wrap {
  position: relative;
  overflow: hidden;
  min-height: calc(100vh - 60px);
}
#hero-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Badges ───────────────────────────────────────────────────── */
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.venue-badge {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-sub);
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--accent-sub2);
  white-space: nowrap;
}

.spotlight-badge {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--t3);
  background: var(--sf3);
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.tag {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--t3);
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--sf2);
  border: 1px solid var(--border);
  white-space: nowrap;
}

/* ── Mission section ──────────────────────────────────────────── */
.mission-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.mission-lede {
  font-family: 'Newsreader', Georgia, serif;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 300;
  font-style: italic;
  color: var(--t1);
  line-height: 1.65;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.mission-body {
  font-size: 14px;
  font-weight: 300;
  color: var(--t2);
  line-height: 1.9;
  margin-bottom: 20px;
}
.mission-body:last-child { margin-bottom: 0; }

@media (max-width: 900px) {
  .mission-grid { grid-template-columns: 1fr; gap: 24px; }
}

/* ── Flagship research cards ──────────────────────────────────── */
.flagship-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ── Paper marquee (Latest Research section) ──────────────────── */
.paper-marquee-wrap {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 6%, black 94%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 6%, black 94%, transparent 100%);
  padding: 8px 0 24px;
}

.paper-marquee-track {
  display: flex;
  gap: 20px;
  width: max-content;
  align-items: stretch;
  animation: paper-pan 40s linear infinite;
}

.paper-marquee-wrap:hover .paper-marquee-track {
  animation-play-state: paused;
}

@keyframes paper-pan {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-33.333%); }
}

.paper-marquee-card {
  width: 300px;
  flex-shrink: 0;
  text-decoration: none;
}

.paper-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.paper-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.paper-card-title {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 17px;
  font-weight: 400;
  color: var(--t1);
  line-height: 1.45;
  flex: 1;
}

.paper-card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.paper-card-meta {
  font-size: 12px;
  color: var(--t3);
}

.paper-card-arrow {
  color: var(--accent);
  font-size: 14px;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.paper-card:hover .paper-card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ── Research areas ───────────────────────────────────────────── */
.areas-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.area-cell {
  background: var(--sf1);
  padding: 28px 24px;
  transition: background 0.2s ease;
  cursor: pointer;
  text-decoration: none;
}
.area-cell:hover { background: var(--sf2); }

.area-icon {
  font-size: 22px;
  line-height: 1;
  margin-bottom: 14px;
}

.area-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--t1);
  margin-bottom: 6px;
  line-height: 1.35;
}

.area-papers {
  font-size: 11px;
  font-weight: 300;
  color: var(--t3);
  line-height: 1.6;
}

/* ── Timeline ─────────────────────────────────────────────────── */
.timeline { display: flex; flex-direction: column; }

.timeline-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px 28px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}
.timeline-item:last-child { border-bottom: none; }

.timeline-date {
  font-size: 12px;
  font-weight: 500;
  color: var(--t3);
  letter-spacing: 0.04em;
  white-space: nowrap;
  padding-top: 2px;
}

.timeline-content {
  font-size: 14px;
  font-weight: 300;
  color: var(--t2);
  line-height: 1.75;
}
.timeline-content a {
  color: var(--t1);
  border-bottom: 1px solid var(--border2);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.timeline-content a:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.timeline-content .venue-badge {
  display: inline;
  vertical-align: middle;
  margin-left: 4px;
  position: relative;
  top: -1px;
}

/* ── Team chips ───────────────────────────────────────────────── */
.team-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.person-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 6px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--sf1);
  font-size: 13px;
  font-weight: 400;
  color: var(--t1);
  transition: border-color 0.2s ease, background 0.2s ease;
  cursor: pointer;
}
.person-chip:hover {
  border-color: var(--accent);
  background: var(--accent-sub);
}
.person-chip.pi {
  border-color: var(--accent);
  background: var(--accent-sub);
  color: var(--accent);
  font-weight: 500;
}
.person-chip.more {
  color: var(--t3);
  background: transparent;
  border-style: dashed;
}
.person-chip.more:hover { color: var(--accent); border-color: var(--accent); }

.chip-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--sf2);
  flex-shrink: 0;
}

/* ── Industry collaborations ──────────────────────────────────── */
.collab-marquee-wrap {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
  padding: 16px 0 12px;
}

.collab-track {
  display: flex;
  gap: 100px;
  width: max-content;
  align-items: center;
  animation: collab-pan 30s linear infinite;
}

.collab-marquee-wrap:hover .collab-track {
  animation-play-state: paused;
}

@keyframes collab-pan {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-33.333%); }
}

.collab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
  cursor: default;
  opacity: 1;
  transition: opacity 0.25s ease;
  width: 200px;
}

.collab-item:hover {
  opacity: 0.75;
}

/* logo image: fixed height box, object-fit preserves aspect ratio */
.collab-item img {
  width: 100%;
  height: 80px;
  object-fit: contain;
  object-position: center;
  display: block;
}

/* square/icon logos (Scale AI, Sesame) get a narrower slot */
.collab-item.logo-square {
  width: 100px;
}

.collab-item-name {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--t3);
  white-space: nowrap;
}

/* Black logos (NVIDIA, Dolby): invert to white in dark mode, keep black in light */
[data-theme="dark"] .collab-item.logo-dark img {
  filter: invert(1) brightness(0.9);
}
[data-theme="light"] .collab-item.logo-dark img {
  filter: none;
}

/* Sesame has a solid bg — round the corners */
.collab-item.logo-rounded img {
  border-radius: 16px;
}

/* ── Footer ───────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 40px;
  background: var(--sf1);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
}

.footer-logo {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--t1);
  margin-bottom: 12px;
}
.footer-logo span { color: var(--accent); }

.footer-desc {
  font-size: 13px;
  font-weight: 300;
  color: var(--t3);
  line-height: 1.75;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--t3);
  margin-bottom: 18px;
}

.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a {
  font-size: 13px;
  font-weight: 300;
  color: var(--t2);
  transition: color 0.2s ease;
}
.footer-col ul a:hover { color: var(--accent); }

.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding: 24px 32px 0;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-bottom p {
  font-size: 12px;
  color: var(--t3);
}

/* ── Page header ──────────────────────────────────────────────── */
.page-header {
  padding: 136px 0 64px;
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-family: 'Newsreader', Georgia, serif;
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 300;
  color: var(--t1);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.page-subtitle {
  font-size: 15px;
  font-weight: 300;
  color: var(--t2);
  max-width: 520px;
  line-height: 1.8;
}

/* ── Research page: filter bar ────────────────────────────────── */
.filter-bar {
  position: sticky;
  top: 60px;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  transition: background 0.35s ease;
}

.filter-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ── Search row ───────────────────────────────────────────────── */
.filter-search-row {
  padding-bottom: 4px;
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  max-width: 480px;
}

.search-icon {
  position: absolute;
  left: 11px;
  width: 15px;
  height: 15px;
  color: var(--t3);
  pointer-events: none;
  flex-shrink: 0;
}

.search-input {
  width: 100%;
  height: 34px;
  padding: 0 32px 0 34px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--sf1);
  color: var(--t1);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s ease, background 0.2s ease;
  appearance: none;
  -webkit-appearance: none;
}
.search-input::placeholder { color: var(--t3); }
.search-input:focus {
  border-color: var(--border2);
  background: var(--sf2);
}
/* hide browser's native clear button */
.search-input::-webkit-search-cancel-button { display: none; }

.search-clear {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  color: var(--t3);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 4px;
  line-height: 1;
  border-radius: 4px;
  font-family: inherit;
}
.search-clear:hover { color: var(--t1); }

/* ── Filter rows ──────────────────────────────────────────────── */
.filter-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--t3);
  min-width: 44px;
}

.filter-pill {
  font-size: 11px;
  font-weight: 500;
  color: var(--t2);
  padding: 4px 11px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  letter-spacing: 0.01em;
  white-space: nowrap;
  font-family: inherit;
}
.filter-pill:hover {
  color: var(--t1);
  border-color: var(--border2);
  background: var(--sf1);
}
.filter-pill.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-sub);
  font-weight: 600;
}

/* ── Research page: papers list ───────────────────────────────── */
.papers-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 32px 96px;
}

.papers-empty {
  display: none;
  padding: 64px 0;
  text-align: center;
  font-size: 14px;
  color: var(--t3);
}

.paper-row-wrap { border-bottom: 1px solid var(--border); }
.paper-row-wrap:last-child { border-bottom: none; }

.paper-row {
  display: grid;
  grid-template-columns: 148px 1fr 48px;
  gap: 0 28px;
  padding: 24px 0;
  align-items: start;
  cursor: pointer;
  transition: padding 0.15s ease;
}
.paper-row:hover { padding-left: 8px; }

.paper-row-venue {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 3px;
}

.paper-row-main {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.paper-row-title {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 17px;
  font-weight: 400;
  color: var(--t1);
  line-height: 1.4;
}

.paper-row-authors {
  font-size: 12px;
  font-weight: 300;
  color: var(--t3);
  line-height: 1.5;
}

.paper-row-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 4px;
}

.paper-row-chevron {
  padding-top: 4px;
  color: var(--t3);
  transition: transform 0.2s ease, color 0.2s ease;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}
.paper-row-chevron svg { width: 16px; height: 16px; }
.paper-row:hover .paper-row-chevron { color: var(--accent); }

.paper-expand {
  display: none;
  padding: 24px 28px 28px;
  background: var(--sf1);
  transition: background 0.35s ease;
}
.paper-expand.open {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
}

.paper-abstract {
  font-size: 14px;
  font-weight: 300;
  color: var(--t2);
  line-height: 1.85;
  max-width: 660px;
}

.paper-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
  min-width: 100px;
}

.paper-link {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 6px 12px;
  border: 1px solid var(--accent);
  border-radius: 5px;
  background: var(--accent-sub);
  transition: background 0.2s ease;
  white-space: nowrap;
}
.paper-link:hover { background: var(--accent-sub2); }

/* ── People page ──────────────────────────────────────────────── */
.pi-section { margin-bottom: 80px; }

.pi-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  padding: 40px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  align-items: start;
}

.pi-photo {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top;
  border-radius: 6px;
  background: var(--sf2);
}

.pi-content { display: flex; flex-direction: column; gap: 14px; }

.pi-name {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 28px;
  font-weight: 300;
  color: var(--t1);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.pi-affiliation {
  font-size: 13px;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 0.03em;
}

.pi-bio {
  font-size: 14px;
  font-weight: 300;
  color: var(--t2);
  line-height: 1.85;
  max-width: 580px;
}

.pi-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.person-link {
  font-size: 12px;
  font-weight: 500;
  color: var(--t2);
  padding: 6px 14px;
  border: 1px solid var(--border2);
  border-radius: 6px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  letter-spacing: 0.02em;
}
.person-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-sub);
}

.people-group { margin-bottom: 60px; }

.people-group-title {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--t3);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.person-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.person-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.person-photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: top;
  border-radius: 5px;
  background: var(--sf2);
}

.person-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--t1);
  line-height: 1.3;
}

.person-role {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.person-interest {
  font-size: 12px;
  font-weight: 300;
  color: var(--t3);
  line-height: 1.65;
  flex: 1;
}

.person-card-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.person-link-sm {
  font-size: 11px;
  font-weight: 500;
  color: var(--t3);
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.person-link-sm:hover { color: var(--accent); border-color: var(--accent); }

/* Alumni */
.alumni-list { display: flex; flex-direction: column; }

.alumni-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
}
.alumni-item:last-child { border-bottom: none; }

.alumni-photo {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top;
  background: var(--sf2);
}

.alumni-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--t1);
  margin-bottom: 2px;
}

.alumni-now {
  font-size: 12px;
  font-weight: 300;
  color: var(--t3);
}

/* ── Events page ──────────────────────────────────────────────── */
.events-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.event-card {
  padding: 32px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.event-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.event-date-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-sub);
  padding: 4px 10px;
  border-radius: 4px;
  display: inline-block;
  align-self: flex-start;
}

.event-title {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 20px;
  font-weight: 400;
  color: var(--t1);
  line-height: 1.3;
}

.event-location {
  font-size: 12px;
  font-weight: 400;
  color: var(--t3);
  display: flex;
  align-items: center;
  gap: 6px;
}

.event-desc {
  font-size: 14px;
  font-weight: 300;
  color: var(--t2);
  line-height: 1.78;
  flex: 1;
}

.event-cta {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
  margin-top: auto;
  align-self: flex-start;
}
.event-cta:hover { gap: 10px; }
.event-cta svg { width: 14px; height: 14px; }

/* ── Reveal animations ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-children > * {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.stagger-children.visible > *:nth-child(1) { opacity:1; transform:none; transition-delay:0ms; }
.stagger-children.visible > *:nth-child(2) { opacity:1; transform:none; transition-delay:70ms; }
.stagger-children.visible > *:nth-child(3) { opacity:1; transform:none; transition-delay:140ms; }
.stagger-children.visible > *:nth-child(4) { opacity:1; transform:none; transition-delay:210ms; }
.stagger-children.visible > *:nth-child(5) { opacity:1; transform:none; transition-delay:280ms; }
.stagger-children.visible > *:nth-child(6) { opacity:1; transform:none; transition-delay:350ms; }
.stagger-children.visible > *:nth-child(7) { opacity:1; transform:none; transition-delay:420ms; }
.stagger-children.visible > *:nth-child(8) { opacity:1; transform:none; transition-delay:490ms; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .people-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .nav-right .nav-link { display: none; }
  .nav-hamburger { display: flex; }

  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-canvas-wrap { height: 50vw; min-height: 300px; }
  .hero-text { padding: 72px 24px 48px; max-width: 100%; }

  .flagship-grid { grid-template-columns: 1fr 1fr; }
  .areas-grid { grid-template-columns: repeat(2, 1fr); }
  .people-grid { grid-template-columns: repeat(2, 1fr); }
  .events-grid { grid-template-columns: 1fr 1fr; }
  .pi-card { grid-template-columns: 180px 1fr; gap: 32px; }

  .paper-row { grid-template-columns: 1fr; gap: 10px; }
  .paper-row-venue { flex-direction: row; flex-wrap: wrap; }
  .paper-expand.open { grid-template-columns: 1fr; }
  .paper-links { flex-direction: row; flex-wrap: wrap; align-items: flex-start; }

  .footer-inner { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 768px) {
  section { padding: 72px 0; }
  .container { padding: 0 20px; }
  .filter-inner { padding: 0 20px; }
  .papers-list { padding: 32px 20px 72px; }

  .flagship-grid { grid-template-columns: 1fr; }
  .areas-grid { grid-template-columns: 1fr 1fr; }
  .people-grid { grid-template-columns: 1fr 1fr; }
  .events-grid { grid-template-columns: 1fr; }

  .pi-card { grid-template-columns: 1fr; }
  .pi-photo { max-width: 180px; }

  .timeline-item { grid-template-columns: 80px 1fr; gap: 12px 16px; }

  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 520px) {
  .nav-inner { padding: 0 16px; }
  .container { padding: 0 16px; }
  .filter-inner { padding: 0 16px; }
  .papers-list { padding: 24px 16px 60px; }
  .hero-text { padding: 64px 16px 40px; }

  .hero-title { font-size: 28px; }
  .areas-grid { grid-template-columns: 1fr 1fr; }
  .people-grid { grid-template-columns: 1fr 1fr; }
  .flagship-grid { grid-template-columns: 1fr; }
  .timeline-item { grid-template-columns: 1fr; gap: 4px; }
  .timeline-date { font-size: 11px; }
}