:root {
  --cmu-red: #a6192e;
  --cmu-red-deep: #7d0d1d;
  --charcoal: #1f2328;
  --charcoal-soft: #2e3339;
  --paper: #f5f3f1;
  --ink: #1b1f24;
  --muted: #5e6670;
  --line: rgba(31, 35, 40, 0.12);
  --panel: #ffffff;
  --shadow: 0 18px 40px rgba(16, 20, 25, 0.1);
  --max-width: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
video { max-width: 100%; display: block; }

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.narrow { max-width: 860px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(166, 25, 46, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #fff;
  flex-shrink: 0;
}

.brand img {
  width: 76px;
  height: 76px;
  object-fit: contain;
}

.brand-left {
  min-width: 220px;
}

.brand-right {
  min-width: 90px;
  justify-content: flex-end;
}

.brand-small {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.9);
}

.logo-mark {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #fff;
}

.brand .logo-mark-img {
  height: 60px;
  width: auto;
}

.main-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.1rem;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}

.main-nav a {
  color: rgba(255,255,255,0.9);
  transition: color 0.15s ease;
  padding: 0.4rem 0;
  position: relative;
}

.main-nav a:hover,
.main-nav a:focus-visible,
.main-nav a.active {
  color: #fff;
}

.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  background: rgba(255,255,255,0.9);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255,255,255,0.25);
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: white;
  margin: 5px auto;
}

.hero {
  position: relative;
  min-height: 720px;
  display: flex;
  align-items: center;
  background: #111;
  overflow: hidden;
}

.hero-video-wrap,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.48;
  filter: contrast(1.1) saturate(0.9) brightness(0.78);
}

.hero-overlay {
  background: linear-gradient(90deg, rgba(17,17,17,0.8), rgba(17,17,17,0.42));
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(var(--max-width), calc(100% - 2rem));
}

.hero-copy {
  max-width: 720px;
  color: #fff;
  padding: 2rem 0;
}

.eyebrow,
.section-kicker {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(2.7rem, 5vw, 5rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
  font-weight: 800;
}

.subtitle {
  margin-top: 1.25rem;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  line-height: 1.3;
  max-width: 620px;
  color: rgba(255,255,255,0.9);
}

.tagline {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.86);
  margin-top: 1rem;
}

.hero-meta {
  margin-top: 1.5rem;
  color: rgba(255,255,255,0.78);
  font-size: 0.95rem;
}

.hero-meta p { margin: 0.14rem 0; }

.hero-actions {
  margin-top: 1.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.8rem 1.3rem;
  border-radius: 999px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--cmu-red);
  color: white;
}

.button.secondary {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.35);
  color: white;
}

.section {
  padding: 5rem 0;
}

.problem-section {
  background: #f0eeeb;
}

.problem-section h2,
.section-head h2,
.page-hero h1,
.research-body h2,
.text-section h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin: 0;
}

.scale-flow {
  margin-top: 2rem;
  display: grid;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--charcoal);
}

.arrow {
  font-size: 1.2rem;
  color: var(--cmu-red);
  margin-left: 0.2rem;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 2rem;
  gap: 1rem;
}

.split-head {
  align-items: center;
}

.pillar-grid,
.feature-grid,
.people-row,
.member-grid,
.projects-grid {
  display: grid;
  gap: 1.4rem;
}

.pillar-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.pillar-card,
.feature-card,
.person-card,
.project-card,
.research-card,
.member-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.pillar-card {
  padding: 1.4rem;
}

.pillar-media-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 1rem;
}

.pillar-media-row video,
.pillar-media-row img {
  width: 100%;
  height: 90px;
  border-radius: 10px;
  display: block;
}

.pillar-media-row video {
  object-fit: cover;
  background: #111;
}

.pillar-media-row img {
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--line);
}

.pillar-media-row.single {
  grid-template-columns: 1fr;
}

.pillar-index {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cmu-red);
  font-weight: 800;
}

.pillar-card h3,
.feature-body h3,
.person-copy h3,
.project-card h3,
.member-card h3 {
  margin: 0.5rem 0 0.6rem;
  font-size: 1.4rem;
  line-height: 1.2;
}

.pillar-card p,
.feature-body p,
.research-body p,
.member-card p,
.project-card p,
.text-section p,
.research-overview p {
  margin: 0;
  color: var(--muted);
}

.section-contrast {
  background: linear-gradient(180deg, #f3f1ef 0%, #ece8e4 100%);
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card {
  overflow: hidden;
}

.feature-media {
  height: 200px;
  background: linear-gradient(135deg, rgba(166,25,46,0.84), rgba(47,53,58,0.8));
}

.feature-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-placeholder {
  background: linear-gradient(135deg, rgba(166,25,46,.9), rgba(96,96,96,.8)),
    linear-gradient(0deg, rgba(255,255,255,.08), rgba(255,255,255,.08));
}

.media-placeholder.alt { background: linear-gradient(135deg, rgba(38,41,46,.8), rgba(166,25,46,.7)); }
.media-placeholder.alt-2 { background: linear-gradient(135deg, rgba(74,76,80,.8), rgba(166,25,46,.7)); }
.media-placeholder.alt-3 { background: linear-gradient(135deg, rgba(166,25,46,.7), rgba(48,58,82,.8)); }
.media-placeholder.alt-4 { background: linear-gradient(135deg, rgba(51,59,74,.8), rgba(166,25,46,.7)); }
.media-placeholder.alt-5 { background: linear-gradient(135deg, rgba(17,17,17,.8), rgba(166,25,46,.6)); }

.feature-body {
  padding: 1.3rem 1.2rem 1.5rem;
}

.feature-body a,
.inline-links a,
.publication-header-links a,
.text-link {
  color: var(--cmu-red);
  font-weight: 700;
}

.people-row {
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
}

.profile-card {
  display: grid;
  grid-template-columns: 1fr;
  justify-items: center;
  text-align: center;
  gap: 0.5rem;
  padding: 0.8rem 0.8rem;
}

.profile-card.large {
  grid-template-columns: 180px 1fr;
  justify-items: stretch;
  text-align: left;
  align-items: center;
  gap: 1rem;
}

.profile-card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  border-radius: 12px;
  background: #ddd;
}

.profile-card:not(.large) img {
  width: 82px;
  height: 82px;
  border-radius: 50%;
}

.person-avatar {
  width: 82px;
  height: 82px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cmu-red), #6b101d);
  color: white;
  display: grid;
  place-items: center;
  font-size: 2rem;
  font-weight: 800;
}

.person-role {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--cmu-red);
}

.page-hero {
  background: linear-gradient(180deg, #1e2328 0%, #2c343b 100%);
  color: white;
  padding: 4rem 0 3rem;
}

.small-hero {
  min-height: 220px;
  display: grid;
  align-items: center;
}

.research-overview {
  max-width: 900px;
  font-size: 1.18rem;
}

.research-card {
  display: grid;
  grid-template-columns: minmax(0,1.1fr) minmax(0,1.4fr);
  gap: 2rem;
  align-items: stretch;
  padding: 0;
  overflow: hidden;
}

.research-card.reverse {
  grid-template-columns: minmax(0,1.4fr) minmax(0,1.1fr);
}

.research-card.reverse .research-visual { order: 2; }
.research-card.reverse .research-body { order: 1; }

.research-visual {
  min-height: 340px;
  background: linear-gradient(135deg, rgba(166,25,46,0.8), rgba(17,17,17,0.85));
  overflow: hidden;
}

.research-visual img,
.research-visual > video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
}

.research-visual img {
  background: #0b0b0b;
}

.research-visual > video {
  background: #0b0b0b;
}

.research-media-grid {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 4px;
  height: 100%;
  min-height: 340px;
}

.research-media-grid video {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: contain;
  background: #0b0b0b;
  display: block;
}

.visual-one { background: linear-gradient(135deg, rgba(166,25,46,.9), rgba(31,35,40,.85)); }
.visual-two { background: linear-gradient(135deg, rgba(56,58,64,.85), rgba(166,25,46,.8)); }
.visual-three { background: linear-gradient(135deg, rgba(166,25,46,.8), rgba(95,97,101,.8)); }
.visual-four { background: linear-gradient(135deg, rgba(36,41,46,.9), rgba(166,25,46,.7)); }

.research-body {
  padding: 2rem;
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.25rem;
}

.logo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.4rem;
  margin-top: 1.5rem;
}

.logo-grid-sponsors {
  grid-template-columns: repeat(auto-fit, minmax(160px, 220px));
}

.logo-card {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 130px;
  padding: 1.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
}

.logo-card:hover,
.logo-card:focus-visible {
  transform: translateY(-3px);
}

.logo-card img {
  max-width: 100%;
  max-height: 90px;
  object-fit: contain;
}

.filter-bar {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

#publication-search {
  width: min(100%, 420px);
  min-height: 46px;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
}

.contact-form {
  display: grid;
  gap: 1.2rem;
  max-width: 560px;
  margin-top: 1.5rem;
}

.form-row {
  display: grid;
  gap: 0.4rem;
}

.form-row label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink);
}

.form-row input,
.form-row select,
.form-row textarea {
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  background: var(--panel);
  color: var(--ink);
  resize: vertical;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: 2px solid var(--cmu-red);
  outline-offset: 1px;
}

.contact-form .button {
  justify-self: start;
}

.form-status {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  font-size: 0.8rem;
  color: var(--ink);
  cursor: pointer;
}

.tag.active {
  background: var(--cmu-red);
  color: white;
  border-color: var(--cmu-red);
}

.publication-list {
  display: grid;
  gap: 1rem;
}

.publication-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.2rem 1.3rem;
}

.publication-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.12rem;
}

.publication-meta {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 0.8rem;
}

.publication-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  font-size: 0.88rem;
}

.publication-item.is-selected {
  border-color: rgba(166,25,46,0.4);
  box-shadow: 0 10px 26px rgba(166,25,46,0.08);
}

.member-grid,
.projects-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.member-card,
.project-card {
  padding: 1.2rem;
}

.member-card img {
  width: 100%;
  height: 230px;
  object-fit: cover;
  border-radius: 12px;
  background: #ddd;
  margin-bottom: 0.9rem;
}

.project-card img,
.project-card .project-media {
  width: 100%;
  height: 170px;
  object-fit: contain;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
  margin-bottom: 0.9rem;
}

.project-card .project-media {
  object-fit: cover;
  background: #0b0b0b;
}

.director-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  align-items: start;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.member-grid > .director-card {
  grid-column: 1 / -1;
  max-width: none;
  margin: 0;
}

.director-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 12px;
  background: #ddd;
}

.director-copy h2 {
  margin: 0 0 0.3rem;
  font-size: 1.8rem;
}

.director-bio {
  margin: 0.8rem 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.bio-list-title {
  margin: 1.2rem 0 0.4rem;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cmu-red);
}

.bio-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  line-height: 1.6;
}

.project-card .status {
  display: inline-block;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  background: rgba(166,25,46,0.1);
  color: var(--cmu-red);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.site-footer {
  padding: 2.1rem 0;
  border-top: 1px solid var(--line);
  background: #f5f3f1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 1rem;
  align-items: start;
}

.footer-brand {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 0.2rem;
}

.footer-brand-img {
  height: 30px;
  width: auto;
  margin-bottom: 0.4rem;
}

.text-section {
  padding-top: 1rem;
}

.text-section p {
  margin-bottom: 1rem;
}

@media (max-width: 980px) {
  .pillar-grid,
  .feature-grid,
  .member-grid,
  .projects-grid,
  .people-row,
  .research-card,
  .research-card.reverse,
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .people-row { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .profile-card.large { grid-template-columns: 1fr; }
  .director-card { grid-template-columns: 160px 1fr; }
}

@media (max-width: 760px) {
  .nav-toggle { display: block; flex-shrink: 0; }

  .brand-left {
    min-width: 0;
    flex-shrink: 1;
  }

  .brand-small {
    white-space: normal;
    line-height: 1.25;
  }

  .brand-left img,
  .brand-right {
    flex-shrink: 0;
  }

  .brand-left img {
    width: 48px;
    height: 48px;
  }

  .brand .logo-mark-img {
    height: 38px;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    background: var(--cmu-red);
    padding: 1rem 1.2rem 1.6rem;
    border-top: 1px solid rgba(255,255,255,0.2);
  }
  .main-nav.open { display: flex; }

  .hero {
    min-height: 600px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .pillar-grid,
  .feature-grid,
  .member-grid,
  .projects-grid,
  .people-row,
  .research-card,
  .research-card.reverse,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .nav-wrap { position: relative; }

  .director-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .director-card img {
    width: 160px;
    height: 160px;
    margin: 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}