/* =========================================================================
   AI for Cities (AI4C) — Cornell Duffield Engineering
   Design system: dark glass morphism
   ========================================================================= */

/* ---------- 1. Tokens ---------------------------------------------------- */

:root {
  /* Ground */
  --bg-0: #05070b;          /* page floor */
  --bg-1: #080b12;          /* section ground */
  --bg-2: #0b0f18;          /* raised ground */

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.035);
  --glass-bg-hi: rgba(255, 255, 255, 0.055);
  --glass-brd: rgba(255, 255, 255, 0.10);
  --glass-brd-hi: rgba(255, 255, 255, 0.20);
  --glass-blur: 22px;
  --glass-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.85);

  /* Ink */
  --ink-0: #f2f5fa;         /* headings */
  --ink-1: #d5dbe6;         /* body */
  --ink-2: #98a2b5;         /* muted */
  --ink-3: #667085;         /* faint */

  /* Accents */
  --red: #d63a3a;           /* Cornell red, lifted for dark ground */
  --red-deep: #b31b1b;      /* Cornell red, official */
  --teal: #43aa8b;
  --teal-lit: #5fd3ae;
  --amber: #f9c74f;
  --slate: #577590;
  --coral: #f3722c;

  /* Layout */
  --maxw: 1240px;
  --gutter: clamp(20px, 4vw, 56px);
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 34px;

  /* Type */
  --f-sans: "Inter", ui-sans-serif, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Helvetica, Arial, sans-serif;
  --f-serif: "Instrument Serif", "Iowan Old Style", Georgia, "Times New Roman",
    serif;
  --f-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    monospace;
}

/* ---------- 2. Reset ----------------------------------------------------- */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: auto; /* Lenis owns scrolling */
}

body {
  margin: 0;
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-1);
  background: var(--bg-0);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4, h5 {
  margin: 0;
  color: var(--ink-0);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.08;
}

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

::selection { background: rgba(214, 58, 58, 0.35); color: #fff; }

:focus-visible {
  outline: 2px solid var(--teal-lit);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Ambient page wash — sits under everything, never scrolls */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60rem 40rem at 82% -8%, rgba(67, 170, 139, 0.10), transparent 60%),
    radial-gradient(48rem 38rem at 4% 12%, rgba(179, 27, 27, 0.13), transparent 62%),
    radial-gradient(70rem 50rem at 50% 108%, rgba(87, 117, 144, 0.14), transparent 64%),
    var(--bg-0);
}

/* Fine grain, keeps the flat dark from banding */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.16;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

/* ---------- 3. Layout helpers ------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--narrow { max-width: 860px; }

.section { position: relative; padding-block: clamp(84px, 11vw, 150px); }
.section--tight { padding-block: clamp(56px, 7vw, 96px); }

.hairline {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.13) 22%,
    rgba(255, 255, 255, 0.13) 78%,
    transparent
  );
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 999;
  padding: 12px 18px;
  border-radius: var(--r-sm);
  background: var(--bg-2);
  color: var(--ink-0);
  border: 1px solid var(--glass-brd-hi);
}
.skip-link:focus { top: 16px; }

/* Fixed header clearance for in-page anchors arriving from another page */
section[id], [id].section { scroll-margin-top: 100px; }

/* ---------- 4. Glass ----------------------------------------------------- */

.glass {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-brd);
  border-radius: var(--r-lg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  box-shadow: var(--glass-shadow);
  overflow: hidden;
}

/* Top-edge specular highlight that sells the material */
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(
    170deg,
    rgba(255, 255, 255, 0.13),
    rgba(255, 255, 255, 0.02) 26%,
    transparent 55%
  );
}

.glass--flat { box-shadow: none; }
.glass--soft { background: rgba(255, 255, 255, 0.022); }

/* ---------- 5. Type scale ------------------------------------------------ */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.19em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--red), rgba(214, 58, 58, 0));
}

.h-display {
  font-size: clamp(2.9rem, 8.2vw, 6.4rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 0.94;
}

.h1 { font-size: clamp(2.3rem, 5.2vw, 3.9rem); letter-spacing: -0.038em; }
.h2 { font-size: clamp(1.85rem, 3.7vw, 2.9rem); letter-spacing: -0.032em; }
.h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); letter-spacing: -0.02em; }

.lede {
  font-size: clamp(1.02rem, 1.5vw, 1.22rem);
  line-height: 1.62;
  color: var(--ink-2);
}

.serif-em {
  font-family: var(--f-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--teal-lit);
}

.mono-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.section-head { max-width: 720px; margin-bottom: clamp(44px, 5vw, 72px); }
.section-head .lede { margin-top: 22px; }

/* ---------- 6. Buttons --------------------------------------------------- */

.btn {
  --btn-bg: var(--glass-bg-hi);
  --btn-brd: var(--glass-brd-hi);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border: 1px solid var(--btn-brd);
  border-radius: 100px;
  background: var(--btn-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  color: var(--ink-0);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.35s ease, background 0.35s ease, color 0.35s ease;
}

.btn__arrow {
  display: inline-block;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.btn:hover { transform: translateY(-2px); border-color: rgba(255, 255, 255, 0.34); }
.btn:hover .btn__arrow { transform: translateX(4px); }

.btn--primary {
  background: linear-gradient(140deg, var(--red), #8f1414);
  border-color: rgba(255, 255, 255, 0.18);
  box-shadow: 0 14px 34px -14px rgba(179, 27, 27, 0.9);
  color: #fff;
}
.btn--primary:hover { box-shadow: 0 20px 44px -14px rgba(179, 27, 27, 1); }

.btn--ghost { background: rgba(255, 255, 255, 0.02); }

.btn--sm { padding: 10px 18px; font-size: 13px; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--teal-lit);
}
.link-arrow span { transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1); }
.link-arrow:hover span { transform: translateX(5px); }

/* ---------- 7. Navigation ------------------------------------------------ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.4s ease, border-color 0.4s ease,
    backdrop-filter 0.4s ease, box-shadow 0.4s ease;
  border-bottom: 1px solid transparent;
}

.nav.is-stuck {
  background: rgba(6, 8, 13, 0.62);
  border-bottom-color: rgba(255, 255, 255, 0.08);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  box-shadow: 0 12px 40px -24px rgba(0, 0, 0, 1);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 78px;
}

.brand { display: flex; align-items: center; gap: 16px; min-width: 0; }
.brand__logo { height: 22px; width: auto; opacity: 0.95; }
.brand__rule {
  width: 1px; height: 26px;
  background: rgba(255, 255, 255, 0.18);
  flex: none;
}
.brand__name {
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink-0);
  white-space: nowrap;
}
.brand__name em {
  font-family: var(--f-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--teal-lit);
}

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

.nav__link {
  position: relative;
  padding: 9px 15px;
  border-radius: 100px;
  font-size: 14px;
  color: var(--ink-2);
  transition: color 0.3s ease, background 0.3s ease;
}
.nav__link:hover { color: var(--ink-0); background: rgba(255, 255, 255, 0.05); }
.nav__link.is-active { color: var(--ink-0); }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 15px; right: 15px; bottom: 2px;
  height: 1px;
  background: var(--red);
}

.nav__actions { display: flex; align-items: center; gap: 12px; }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px solid var(--glass-brd);
  background: var(--glass-bg);
  color: var(--ink-0);
  cursor: pointer;
}
.nav__toggle span {
  display: block;
  width: 17px; height: 1.5px;
  background: currentColor;
  position: relative;
  transition: transform 0.3s ease, background 0.3s ease;
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 17px; height: 1.5px;
  background: currentColor;
  transition: transform 0.3s ease;
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after { top: 6px; }
.nav__toggle.is-open span { background: transparent; }
.nav__toggle.is-open span::before { transform: translateY(6px) rotate(45deg); }
.nav__toggle.is-open span::after { transform: translateY(-6px) rotate(-45deg); }

.nav__drawer {
  display: none;
  padding: 12px var(--gutter) 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(6, 8, 13, 0.9);
  -webkit-backdrop-filter: blur(22px);
  backdrop-filter: blur(22px);
}
.nav__drawer a {
  display: block;
  padding: 14px 2px;
  font-size: 17px;
  color: var(--ink-1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.nav__drawer a:last-child { border-bottom: 0; }

/* ---------- 8. Hero + globe --------------------------------------------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 78px;
  overflow: hidden;
  isolation: isolate;
}

.hero__stage {
  position: absolute;
  inset: 0;
  z-index: -1;
}

#globe-canvas { width: 100%; height: 100%; display: block; }

/* Vignette + floor fade so the globe melts into the page */
.hero__stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(70% 60% at 50% 46%, transparent 42%, rgba(5, 7, 11, 0.55) 100%),
    linear-gradient(to bottom, rgba(5, 7, 11, 0.72) 0%, transparent 26%, transparent 62%, var(--bg-0) 97%);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  width: 100%;
  padding-block: clamp(60px, 9vh, 120px);
}

.hero__copy { max-width: 720px; }

.hero__title { margin-bottom: 26px; }
.hero__title .line { display: block; overflow: hidden; }
.hero__title .line > span { display: block; }

.hero__title-sub {
  display: block;
  margin-top: 0.42em;
  font-size: clamp(1.05rem, 2.05vw, 1.62rem);
  font-weight: 300;
  letter-spacing: -0.018em;
  line-height: 1.28;
  color: var(--ink-2);
}

.hero__lede { max-width: 560px; font-size: clamp(1.02rem, 1.35vw, 1.16rem); }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 8px 8px 16px;
  margin-bottom: 30px;
  border-radius: 100px;
  border: 1px solid var(--glass-brd);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  font-size: 12.5px;
  color: var(--ink-2);
}
.hero__badge b {
  padding: 4px 11px;
  border-radius: 100px;
  background: rgba(214, 58, 58, 0.16);
  border: 1px solid rgba(214, 58, 58, 0.32);
  color: #ff9b9b;
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin-top: clamp(44px, 6vh, 72px);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--glass-brd);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  max-width: 860px;
}
.stat { padding: 22px 24px; background: rgba(9, 12, 19, 0.72); }
.stat__n {
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  color: var(--ink-0);
  line-height: 1;
}
.stat__n small { font-size: 0.55em; color: var(--teal-lit); margin-left: 2px; }
.stat__l {
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-3);
}

.scroll-cue {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.scroll-cue i {
  display: block;
  width: 1px;
  height: 42px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.4), transparent);
  animation: cue 2.4s ease-in-out infinite;
  transform-origin: top;
}
@keyframes cue {
  0%, 100% { transform: scaleY(0.35); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* Globe legend chips floating over the canvas */
.globe-key {
  position: absolute;
  right: var(--gutter);
  bottom: 96px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
  pointer-events: none;
}
.globe-key__item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 13px;
  border-radius: 100px;
  border: 1px solid var(--glass-brd);
  background: rgba(9, 12, 19, 0.5);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  font-size: 11.5px;
  color: var(--ink-2);
  white-space: nowrap;
}
.globe-key__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--teal-lit);
  box-shadow: 0 0 10px var(--teal-lit);
}

/* Globe city labels — projected from three.js each frame */
#globe-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
  transition: opacity 0.3s linear;
}

.globe-label {
  position: absolute;
  top: 0; left: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 10px;
  border-radius: 100px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(8, 12, 19, 0.66);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--ink-1);
  white-space: nowrap;
  opacity: 0;
  will-change: transform, opacity;
}
.globe-label i {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 9px var(--amber);
}

#globe-canvas { cursor: grab; touch-action: pan-y; }
.hero__stage.is-dragging #globe-canvas { cursor: grabbing; }

@media (max-width: 900px) {
  .hero__stage::after {
    background:
      radial-gradient(80% 64% at 50% 38%, rgba(5, 7, 11, 0.18), rgba(5, 7, 11, 0.70) 100%),
      linear-gradient(to bottom, rgba(5, 7, 11, 0.62) 0%, rgba(5, 7, 11, 0.20) 32%, rgba(5, 7, 11, 0.42) 72%, var(--bg-0) 98%);
  }
}

/* ---------- 9. Marquee --------------------------------------------------- */

.marquee {
  position: relative;
  overflow: hidden;
  padding-block: 26px;
  border-block: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(255, 255, 255, 0.014);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee__track {
  display: flex;
  gap: 60px;
  width: max-content;
  will-change: transform;
}
.marquee__item {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  white-space: nowrap;
}
.marquee__item::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--red);
  opacity: 0.7;
}

/* ---------- 10. Cards ---------------------------------------------------- */

.grid { display: grid; gap: 22px; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(238px, 1fr)); }
/* auto-FILL: keeps card width constant when a row is only part-full */
.grid--fill { grid-template-columns: repeat(auto-fill, minmax(285px, 1fr)); }

/* Theme card */
.theme-card {
  padding: 30px 28px 32px;
  min-height: 268px;
  display: flex;
  flex-direction: column;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.5s ease, background 0.5s ease;
}
.theme-card:hover {
  transform: translateY(-5px);
  border-color: var(--glass-brd-hi);
  background: var(--glass-bg-hi);
}
.theme-card__n {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  margin-bottom: 26px;
}
.theme-card h3 { margin-bottom: 14px; font-size: 1.22rem; }
.theme-card p { font-size: 14.6px; color: var(--ink-2); line-height: 1.62; }
.theme-card__glow {
  position: absolute;
  inset: auto -30% -60% auto;
  width: 240px; height: 240px;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0;
  transition: opacity 0.6s ease;
  pointer-events: none;
}
.theme-card:hover .theme-card__glow { opacity: 0.32; }

/* Project card */
.project-card {
  display: block;
  position: relative;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.5s ease;
}
.project-card:hover { transform: translateY(-6px); border-color: var(--glass-brd-hi); }

.project-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    radial-gradient(80% 80% at 50% 45%, rgba(67, 170, 139, 0.14), transparent 70%),
    #070a10;
}
.project-card__media img {
  width: 100%; height: 100%;
  object-fit: contain;
  padding: 18px;
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
.project-card:hover .project-card__media img { transform: scale(1.045); }
.project-card__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 55%, rgba(8, 11, 18, 0.9));
}

.project-card__body { padding: 26px 28px 30px; }
.project-card__body h3 { margin-bottom: 10px; }
.project-card__body p { font-size: 14.6px; color: var(--ink-2); }

.pill-row { display: flex; flex-wrap: wrap; gap: 8px; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border-radius: 100px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  background: rgba(255, 255, 255, 0.035);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--ink-2);
  white-space: nowrap;
}
.pill--live { border-color: rgba(95, 211, 174, 0.4); color: var(--teal-lit); }
.pill--live::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--teal-lit);
  box-shadow: 0 0 8px var(--teal-lit);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.pill--soon { border-color: rgba(249, 199, 79, 0.32); color: var(--amber); }

/* Featured project — wide split card */
.feature {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  align-items: stretch;
}
.feature__media {
  position: relative;
  min-height: 340px;
  background:
    radial-gradient(75% 70% at 50% 50%, rgba(67, 170, 139, 0.16), transparent 72%),
    #060910;
  overflow: hidden;
}
.feature__media img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: contain;
  padding: 26px;
}
/* Reversed: media on the right, so two stacked features alternate */
.feature--reverse { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); }
.feature--reverse .feature__media { order: 2; }
.feature--reverse .feature__body {
  order: 1;
  border-left: 0;
  border-right: 1px solid rgba(255, 255, 255, 0.07);
}

.feature__body {
  padding: clamp(30px, 3.6vw, 52px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 20px;
  border-left: 1px solid rgba(255, 255, 255, 0.07);
}

/* Person card */
.person-card {
  display: block;
  position: relative;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.5s ease;
}
.person-card:hover { transform: translateY(-6px); border-color: var(--glass-brd-hi); }

.person-card__photo {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #0a0d14;
}
.person-card__photo img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(0.7) contrast(1.04) brightness(0.92);
  transition: filter 0.7s ease, transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
.person-card:hover .person-card__photo img {
  filter: grayscale(0) contrast(1) brightness(1);
  transform: scale(1.04);
}
.person-card__photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(6, 9, 15, 0.1) 40%, rgba(8, 11, 18, 0.88));
  pointer-events: none;
}
.person-card__tag {
  position: absolute;
  top: 14px; left: 14px;
  z-index: 2;
  padding: 5px 11px;
  border-radius: 100px;
  background: rgba(6, 9, 15, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.14);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.person-card__body { padding: 20px 22px 24px; }
.person-card__body h3 { font-size: 1.12rem; margin-bottom: 5px; }
.person-card__role {
  font-size: 13px;
  color: var(--teal-lit);
  margin-bottom: 10px;
}
.person-card__aff { font-size: 12.5px; color: var(--ink-3); line-height: 1.5; }
.person-card__cta {
  margin-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: var(--ink-2);
  transition: color 0.3s ease, gap 0.3s ease;
}
.person-card:hover .person-card__cta { color: var(--ink-0); gap: 11px; }

/* ---------- 11. Prose ---------------------------------------------------- */

.prose { font-size: 16.2px; line-height: 1.72; color: var(--ink-1); }
.prose p + p { margin-top: 0; }
.prose h3 { margin: 40px 0 14px; font-size: 1.24rem; }
.prose strong { color: var(--ink-0); font-weight: 600; }
.prose a { color: var(--teal-lit); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.prose ul { margin: 0 0 1.1em; }
.prose ul li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 11px;
  color: var(--ink-2);
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 2px; top: 11px;
  width: 6px; height: 6px;
  border-radius: 50%;
  border: 1px solid var(--teal);
}

.pullquote {
  padding: 30px 32px;
  font-family: var(--f-serif);
  font-size: clamp(1.25rem, 2.2vw, 1.62rem);
  line-height: 1.4;
  letter-spacing: -0.015em;
  color: var(--ink-0);
}
.pullquote footer {
  margin-top: 16px;
  font-family: var(--f-sans);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

/* Definition rows (used on profiles and the project page) */
.deflist { display: grid; gap: 1px; background: rgba(255, 255, 255, 0.07); }
.deflist__row {
  display: grid;
  grid-template-columns: minmax(120px, 0.42fr) minmax(0, 1fr);
  gap: 18px;
  padding: 15px 22px;
  background: rgba(9, 12, 19, 0.78);
  font-size: 14px;
}
.deflist__row dt { color: var(--ink-3); font-size: 12.5px; letter-spacing: 0.04em; }
.deflist__row dd { margin: 0; color: var(--ink-1); }
.deflist__row dd a { color: var(--teal-lit); }

/* ---------- 12. Page header (interior pages) ----------------------------- */

.pagehead {
  position: relative;
  padding-top: calc(78px + clamp(44px, 6vw, 84px));
  padding-bottom: clamp(36px, 4.5vw, 58px);
  overflow: hidden;
}
.pagehead::before {
  content: "";
  position: absolute;
  inset: -30% 20% auto -10%;
  height: 460px;
  background: radial-gradient(50% 50% at 30% 50%, rgba(67, 170, 139, 0.13), transparent 70%);
  pointer-events: none;
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 26px;
  font-size: 12.5px;
  color: var(--ink-3);
}
.crumbs a { color: var(--ink-2); }
.crumbs a:hover { color: var(--ink-0); }
.crumbs span { opacity: 0.45; }

/* ---------- 13. Profile -------------------------------------------------- */

.profile {
  display: grid;
  grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 60px);
  align-items: start;
}

.profile__aside { position: sticky; top: 104px; display: grid; gap: 18px; }

.profile__photo { padding: 12px; }
.profile__photo img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: calc(var(--r-lg) - 10px);
}

.profile__name { margin-bottom: 12px; }
.profile__role {
  display: inline-block;
  margin-bottom: 22px;
  padding: 6px 14px;
  border-radius: 100px;
  background: rgba(214, 58, 58, 0.14);
  border: 1px solid rgba(214, 58, 58, 0.3);
  color: #ffa8a8;
  font-size: 12.5px;
  letter-spacing: 0.04em;
}
.profile__role--advisory {
  background: rgba(87, 117, 144, 0.16);
  border-color: rgba(87, 117, 144, 0.4);
  color: #a6c4dd;
}
.profile__role--student {
  background: rgba(67, 170, 139, 0.14);
  border-color: rgba(67, 170, 139, 0.36);
  color: var(--teal-lit);
}

.peer-nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding-top: 34px;
  margin-top: 56px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.peer-nav a { display: block; max-width: 46%; }
.peer-nav small {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 7px;
}
.peer-nav b { font-weight: 500; color: var(--ink-1); font-size: 15px; }
.peer-nav a:hover b { color: var(--ink-0); }
.peer-nav .is-right { text-align: right; margin-left: auto; }

/* ---------- 14. Legend / data key --------------------------------------- */

.legend { display: grid; gap: 10px; }
.legend__row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13.4px;
  color: var(--ink-2);
}
.legend__sw {
  width: 13px; height: 13px;
  border-radius: 3px;
  flex: none;
  box-shadow: 0 0 12px -2px currentColor;
}

/* ---------- 15. CTA band ------------------------------------------------- */

.cta-band {
  position: relative;
  padding: clamp(42px, 6vw, 76px);
  text-align: center;
  overflow: hidden;
}
.cta-band::after {
  content: "";
  position: absolute;
  inset: auto -20% -70% -20%;
  height: 420px;
  background: radial-gradient(50% 60% at 50% 50%, rgba(179, 27, 27, 0.28), transparent 70%);
  pointer-events: none;
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band .h2 { margin-bottom: 20px; }
.cta-band .lede { max-width: 620px; margin-inline: auto; }
.cta-band .hero__actions { justify-content: center; }

/* ---------- 16. Footer --------------------------------------------------- */

.footer {
  position: relative;
  padding-top: clamp(56px, 7vw, 88px);
  padding-bottom: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.012), transparent);
}
.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(auto-fit, minmax(140px, 1fr));
  gap: 44px;
  padding-bottom: 48px;
}
.footer__logo { height: 60px; width: auto; margin-bottom: 22px; opacity: 0.92; }
.footer__blurb { font-size: 14px; color: var(--ink-3); max-width: 340px; }
.footer h4 {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 18px;
  font-weight: 600;
}
.footer li { margin-bottom: 11px; }
.footer li a { font-size: 14px; color: var(--ink-3); transition: color 0.3s ease; }
.footer li a:hover { color: var(--ink-0); }
.footer__base {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 12.5px;
  color: var(--ink-3);
}

/* ---------- 17. Reveal animations --------------------------------------- */

[data-reveal] { opacity: 0; transform: translateY(26px); }
[data-reveal-stagger] > * { opacity: 0; transform: translateY(26px); }
.no-js [data-reveal],
.no-js [data-reveal-stagger] > * { opacity: 1; transform: none; }

/* ---------- 18. Responsive ---------------------------------------------- */

@media (max-width: 1040px) {
  .feature, .feature--reverse { grid-template-columns: minmax(0, 1fr); }
  .feature__body { border-left: 0; border-top: 1px solid rgba(255, 255, 255, 0.07); }
  .feature--reverse .feature__media { order: 0; }
  .feature--reverse .feature__body { order: 0; border-right: 0; }
  .feature__media { min-height: 280px; }
}

@media (max-width: 900px) {
  .nav__links, .nav__actions .btn { display: none; }
  .nav__toggle { display: inline-flex; }
  .nav.is-open .nav__drawer { display: block; }
  .nav.is-open {
    background: rgba(6, 8, 13, 0.9);
    -webkit-backdrop-filter: blur(22px);
    backdrop-filter: blur(22px);
  }
  .profile { grid-template-columns: minmax(0, 1fr); }
  .profile__aside { position: static; max-width: 420px; }
  .globe-key { display: none; }
}

@media (max-width: 700px) {
  /* The one-line Cornell lockup is 13:1 — at any legible height it and the
     wordmark cannot share the bar with the menu button. Keep the lockup. */
  .brand__rule, .brand__name { display: none; }
  .brand__logo { height: 15px; }
  .nav__inner { height: 66px; }
  #globe-labels { display: none; }
  .hero { padding-top: 66px; }
}

@media (max-width: 620px) {
  .hero { min-height: 92svh; }
  .hero__stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .deflist__row { grid-template-columns: minmax(0, 1fr); gap: 5px; }
  .scroll-cue { display: none; }
  .peer-nav a { max-width: 48%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal], [data-reveal-stagger] > * { opacity: 1 !important; transform: none !important; }
}

/* Backdrop-filter fallback: opaque panels where the browser can't blur */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass, .btn, .hero__badge, .globe-key__item, .nav.is-stuck {
    background: rgba(12, 16, 24, 0.94);
  }
}