:root {
  --paper:        #faf9f6;
  --paper-raised: #ffffff;
  --paper-sunk:   #f3f1ea;
  --ink:          #12161c;
  --ink-soft:     #4a5158;
  --ink-faint:    #8b8f96;
  --accent:       #0f6e6e;
  --accent-deep:  #0a5252;
  --accent-wash:  #e2eeec;
  --hilite:       #c4573f;
  --hilite-wash:  #f7e7e1;
  --line:         #e6e2da;
  --line-strong:  #d5d0c4;

  --font-display: 'Familjen Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font-text:    'Newsreader', Georgia, 'Times New Roman', serif;

  --measure: 1180px;
  --measure-text: 720px;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(18, 22, 28, .04), 0 12px 32px -12px rgba(18, 22, 28, .14);
  --nav-h: 106px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);

  font-size: 18.5px;
  line-height: 1.68;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a { color: var(--accent); text-decoration: none; }

@media (hover: hover) and (pointer: fine) {
  a:hover { color: var(--accent-deep); }
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.022em;
  margin: 0;
  text-wrap: balance;
}

::selection { background: var(--accent-wash); color: var(--accent-deep); }

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

.eyebrow {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--nav-h);
  background: var(--paper);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.nav.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 6px 18px -14px rgba(18, 22, 28, .35);
}

.nav__inner {
  height: 100%;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: none;
}
.brand img {
  mix-blend-mode: multiply;
  width: auto;
}

.brand__iitm { height: 74px; }
.brand__htic { height: 64px; }
.brand__rule {
  width: 1px;
  height: 48px;
  background: var(--line-strong);
  flex: none;
}

.nav__toggle {
  display: none;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: linear-gradient(180deg, #ffffff, #f7f5f0);
  color: var(--ink);
  cursor: pointer;
  box-shadow: inset 0 1px 0 #ffffff, 0 1px 2px rgba(18, 22, 28, .06);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.nav__toggle:active {
  border-color: var(--accent);
  box-shadow: inset 0 1px 2px rgba(18, 22, 28, .1);
}
.nav__toggle[aria-expanded="true"] { border-color: var(--accent); }

.nav__bars,
.nav__bars::before,
.nav__bars::after {
  display: block;
  width: 19px;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .24s cubic-bezier(.4, 0, .2, 1), background-color .18s ease;
}
.nav__bars { position: relative; }
.nav__bars::before,
.nav__bars::after {
  content: '';
  position: absolute;
  left: 0;
}
.nav__bars::before { top: -6px; }
.nav__bars::after  { top: 6px; }
.nav__toggle[aria-expanded="true"] .nav__bars { background-color: transparent; }
.nav__toggle[aria-expanded="true"] .nav__bars::before { transform: translateY(6px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__bars::after  { transform: translateY(-6px) rotate(-45deg); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__links a {
  position: relative;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 4px 0;
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s ease;
}
.nav__links a.is-active { color: var(--ink); }
.nav__links a.is-active::after { transform: scaleX(1); }

.hero {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 40px 32px 56px;
  display: grid;
  grid-template-columns: 1fr minmax(250px, 316px);
  gap: 40px;
  align-items: center;
  text-align: left;
}

.hero__text { min-width: 0; }
.hero__visual {
  position: relative;
  margin: 0;
  align-self: center;
  isolation: isolate;
  mix-blend-mode: multiply;

  -webkit-mask-image:
    linear-gradient(to right, transparent, #000 4%, #000 96%, transparent),
    linear-gradient(to bottom, transparent, #000 2.5%, #000 97.5%, transparent);
  mask-image:
    linear-gradient(to right, transparent, #000 4%, #000 96%, transparent),
    linear-gradient(to bottom, transparent, #000 2.5%, #000 97.5%, transparent);
  -webkit-mask-composite: source-in;
  mask-composite: intersect;
}
.hero__visual video {
  display: block;
  width: 100%;
  height: auto;
}
.hero__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  mix-blend-mode: screen;

  background-color: var(--cloud-tint, #0f5f5f);
  transition: background-color .45s ease;
}

.venue {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .13em;
  text-transform: uppercase;
  margin: 0 0 24px;
}
.venue__where { color: var(--accent); }
.venue__where i {
  font-style: normal;
  color: var(--line-strong);
  margin: 0 4px;
}
.venue__rule {
  width: 1px;
  height: 13px;
  background: var(--line-strong);
}
.venue__badge {
  color: var(--hilite);
  font-weight: 700;
}

.hero__title {
  font-size: clamp(32px, 3.5vw, 49px);
  font-weight: 700;
  letter-spacing: -0.03em;

  max-width: none;
  margin: 0;
}
.hero__title-mark { color: var(--accent); }
.hero__title-colon { color: var(--line-strong); }

.hero__authors {
  font-size: 18.5px;
  line-height: 1.7;
  max-width: none;
  margin: 32px 0 0;
  color: var(--ink);
}
.hero__authors a { color: var(--ink); border-bottom: 1px solid var(--line-strong); }
.hero__authors sup { font-size: 11px; color: var(--ink-faint); }

.hero__affil {
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--ink-faint);
  margin: 12px 0 0;
  max-width: none;
}
.hero__affil p { margin: 0; }
.hero__affil sup { margin-right: 1px; }
.hero__affil-note { margin-top: 6px !important; color: var(--hilite); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 36px 0 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 52px;
  padding: 0 25px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff, #f7f5f0);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.01em;
  box-shadow:
    inset 0 1px 0 #ffffff,
    0 1px 2px rgba(18, 22, 28, .06),
    0 8px 16px -12px rgba(18, 22, 28, .25);
  transition: transform .2s cubic-bezier(.2, .7, .3, 1),
              box-shadow .2s cubic-bezier(.2, .7, .3, 1),
              border-color .2s ease, color .2s ease;
}
.btn svg { flex: none; }

.btn:active {
  transform: translateY(0);
  box-shadow:
    inset 0 1px 2px rgba(18, 22, 28, .1),
    0 1px 2px rgba(18, 22, 28, .06);
}

.section {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 104px 32px;
}
.band {
  background: var(--paper-sunk);
  border-block: 1px solid var(--line);
}

.split {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 64px;
  align-items: start;
}
.split__rail { position: sticky; top: calc(var(--nav-h) + 40px); }
.split__body { max-width: 68ch; }

.facts {
  margin: 22px 0 0;
  border-top: 1px solid var(--line-strong);
}
.facts__row {
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}
.facts dt {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.facts dd {
  margin: 3px 0 0;
  font-size: 15.5px;
  line-height: 1.45;
  color: var(--ink);
}

.prose {
  font-size: 18.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0 0 22px;
}
.prose:last-child { margin-bottom: 0; }
.prose--lead {
  font-size: 22.5px;
  line-height: 1.5;
  color: var(--ink);
  letter-spacing: -0.008em;

  max-width: 56ch;
  margin-bottom: 26px;
}
.prose b, .prose strong { color: var(--ink); font-weight: 600; }
.prose .num {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--accent-deep);
  white-space: nowrap;
}

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 34px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line-strong);
}
.keywords li {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 13px;
}

.section-head {
  max-width: 780px;
  margin: 0 0 52px;
}
.section-head h2 {
  font-size: clamp(28px, 3.2vw, 40px);
  letter-spacing: -0.028em;
}
.section-lede {
  font-size: 19px;
  line-height: 1.65;
  color: var(--ink-soft);
  margin: 18px 0 0;
}
.section-lede b { color: var(--ink); font-weight: 600; }

.figure { margin: 0 0 56px; }
.figure__frame {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.figure__frame img { width: 100%; }
figcaption {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink-faint);
  margin: 16px auto 0;
  max-width: var(--measure-text);
  text-align: center;
}
figcaption b {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
}

.pull {
  margin: 0 0 60px;
  padding: 4px 0 4px 30px;
  border-left: 3px solid var(--accent);
  font-size: clamp(21px, 2.4vw, 27px);
  line-height: 1.42;
  letter-spacing: -0.012em;
  color: var(--ink);
  max-width: 900px;
}
.pull em {
  font-style: italic;
  color: var(--accent-deep);
}

.stages {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.stages::before {
  content: '';
  position: absolute;
  left: 25px;
  top: 26px;
  bottom: 26px;
  width: 1px;
  background: var(--line-strong);
}
.stage {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 26px;
  padding: 0 0 34px;
}
.stage:last-child { padding-bottom: 0; }
.stage__n {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-deep);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.stage__body { padding-top: 9px; max-width: 74ch; }
.stage__body h3 {
  font-size: 20px;
  letter-spacing: -0.018em;
  margin: 0 0 7px;
}
.stage__body p {
  margin: 0;
  font-size: 17.5px;
  line-height: 1.62;
  color: var(--ink-soft);
}

.mono {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .93em;
  color: var(--accent-deep);
  background: var(--accent-wash);
  border-radius: 5px;
  padding: 1px 6px;
  white-space: nowrap;
}

.sub {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 22px;
  letter-spacing: -0.02em;
  margin: 64px 0 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-strong);
}
.sub span {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-left: auto;
}

.losses {
  margin: 0;
  padding: 0;
}
.loss {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 26px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.loss:last-child { border-bottom: 0; }
.loss dt {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--ink);
}
.loss dd {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.loss dt b {
  display: inline-block;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--hilite);
  background: var(--hilite-wash);
  border-radius: 4px;
  padding: 2px 6px;
  margin-left: 8px;
  vertical-align: 2px;
}

.note {
  font-size: 16.5px;
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 78ch;
  margin: 6px 0 0;
}
.note b { color: var(--ink); font-weight: 600; }

.lede-sm {
  font-size: 17.5px;
  line-height: 1.62;
  color: var(--ink-soft);
  max-width: 76ch;
  margin: 0 0 30px;
}

.clouds {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px 24px;
  margin: 0 0 26px;
}

.clouds--ablation .clouds__item--gt { grid-column: 2; }
.clouds__item { margin: 0; }

.clouds__item--gt .clouds__frame {
  border-color: var(--line-strong);
  box-shadow: 0 0 0 3px var(--accent-wash);
}
.clouds__frame {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 3 / 4;
}
.clouds__frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.clouds__cap {
  margin: 15px 0 0;
  font-size: 15px;
  line-height: 1.45;
  color: var(--ink-faint);
  text-align: center;
}
.clouds__v b {
  display: inline-block;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--hilite);
  background: var(--hilite-wash);
  border-radius: 4px;
  padding: 2px 6px;
  margin-left: 7px;
  vertical-align: 2px;
}
.clouds__v {
  display: block;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 3px;
}

.videos {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin: 0 0 24px;
}
.vid { margin: 0; }
.vid__frame {
  position: relative;
  background: #0e1116;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.vid__frame video {
  display: block;
  width: 100%;
  height: auto;
}
.vid__tag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .11em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(14, 17, 22, .72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: 6px;
  padding: 5px 10px;
  pointer-events: none;
}
.vid figcaption {
  margin: 14px 0 0;
  max-width: none;
  text-align: left;
  font-size: 15.5px;
}

.foot {
  border-top: 1px solid var(--line);
  background: var(--paper-sunk);
  margin-top: 40px;
}
.foot__inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 60px 32px 52px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.1fr;
  gap: 48px;
}
.foot__mark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin: 0 0 10px;
}
.foot__note {
  font-size: 16.5px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0;
  max-width: 46ch;
}

.foot__logos {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 30px;
}
.foot__logos img {
  mix-blend-mode: multiply;
  width: auto;
}
.foot__iitm { height: 66px; }
.foot__htic { height: 57px; }
.foot__rule {
  width: 1px;
  height: 42px;
  background: var(--line-strong);
  flex: none;
}

.foot__col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 9px;
}
.foot__h {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 4px;
}
.foot__col a {
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.foot__who {
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 4px 0 0;
}
.foot__who span {
  font-family: var(--font-display);
  font-size: 12.5px;
  color: var(--ink-faint);
}

.foot__base {
  max-width: calc(var(--measure) - 64px);
  margin: 0 auto;
  padding: 20px 0 44px;
  border-top: 1px solid var(--line-strong);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: 13.5px;
  color: var(--ink-faint);
}

.totop {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 70;

  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, #ffffff, #f7f5f0);
  color: var(--ink);
  box-shadow:
    inset 0 1px 0 #ffffff,
    0 1px 2px rgba(18, 22, 28, .06),
    0 8px 18px -10px rgba(18, 22, 28, .3);

  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s ease, transform .25s cubic-bezier(.2, .7, .3, 1),
              visibility .25s, border-color .2s ease, color .2s ease,
              box-shadow .2s ease;
}
.totop.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.totop:active { transform: translateY(0); }

@keyframes rise-in {
  from { opacity: 0; transform: translateY(var(--rise, 16px)); }
  to   { opacity: 1; transform: none; }
}

.has-js .hero__text > *,
.has-js .hero__visual {
  animation: rise-in .72s cubic-bezier(.22, .61, .36, 1) both;
}
.has-js .venue          { animation-delay: .04s; }

.has-js .hero__title    { animation-delay: .12s; animation-duration: 1.15s; --rise: 36px; }
.has-js .hero__authors  { animation-delay: .26s; }
.has-js .hero__affil    { animation-delay: .32s; }
.has-js .actions        { animation-delay: .38s; }

.has-js .hero__visual   { animation-delay: .16s; animation-duration: .9s; }

.hero__title .tw { display: inline-block; }
.has-js .hero__title.is-split { animation: none; }
.hero__title.is-split .tl {
  display: inline-block;

  animation: title-letter .52s cubic-bezier(.28, 1.70, .44, 1.16) both;
  animation-delay: calc(.08s + var(--i, 0) * 11ms);
}
@keyframes title-letter {
  from { opacity: 0; transform: translateY(.45em); }
  to   { opacity: 1; transform: none; }
}

.has-js .section-head h2 { --rise: 20px; }

.has-js .reveal {
  opacity: 0;
  transform: translateY(var(--rise, 14px));
  transition:
    opacity .62s cubic-bezier(.22, .61, .36, 1) var(--reveal-delay, 0ms),
    transform .62s cubic-bezier(.22, .61, .36, 1) var(--reveal-delay, 0ms);
}
.has-js .reveal.is-in {
  opacity: 1;
  transform: none;
}

.clouds__frame { transition: border-color .25s ease; }

@media (hover: hover) and (pointer: fine) {
  .nav__toggle:hover { border-color: var(--accent); color: var(--accent-deep); }

  .nav__links a:hover { color: var(--ink); }
  .nav__links a:hover::after { transform: scaleX(1); }

  .hero__authors a:hover { color: var(--accent); border-bottom-color: var(--accent); }

  .btn:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    color: var(--accent-deep);
    box-shadow:
      inset 0 1px 0 #ffffff,
      0 2px 4px rgba(18, 22, 28, .07),
      0 14px 28px -14px rgba(15, 110, 110, .45);
  }

  .stage:hover .stage__n {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-wash);
  }

  .foot__col a:hover { color: var(--accent-deep); border-bottom-color: var(--accent); }

  .totop:hover {
    border-color: var(--accent);
    color: var(--accent-deep);
    transform: translateY(-2px);
    box-shadow:
      inset 0 1px 0 #ffffff,
      0 2px 4px rgba(18, 22, 28, .07),
      0 14px 26px -12px rgba(15, 110, 110, .45);
  }

  .clouds__item:hover .clouds__frame { border-color: var(--line-strong); }
}

@media (hover: none) {
  .btn:active,
  .totop:active { transform: translateY(1px); }
}

@media (max-width: 900px) {
  :root { --nav-h: 86px; }
  .nav__links { gap: 22px; }
  .nav__links a { font-size: 14px; }
  .brand__iitm { height: 58px; }
  .brand__htic { height: 50px; }
  .brand__rule { height: 38px; }
}
@media (max-width: 940px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 0;
    text-align: center;
    padding-bottom: 44px;
  }
  .hero__text { display: contents; }
  .hero__visual { order: 1; width: 300px; margin: 26px auto 4px; }
  .hero__authors,
  .hero__affil,
  .actions { order: 2; }

  .venue { justify-content: center; }

  .hero__title { font-size: clamp(32px, 5.2vw, 50px); margin: 0 auto; min-width: 0; }
  .hero__authors { margin: 34px auto 0; max-width: 760px; }
  .hero__affil { margin: 12px auto 0; max-width: 640px; }
  .actions { justify-content: center; }
  .clouds { grid-template-columns: repeat(2, 1fr); gap: 22px 20px; }
  .clouds--ablation .clouds__item--gt { grid-column: auto; }
  .foot__inner { grid-template-columns: 1fr 1fr; gap: 34px 40px; }
  .foot__brand { grid-column: 1 / -1; }
  .foot__iitm { height: 56px; }
  .foot__htic { height: 48px; }
  .split {
    grid-template-columns: 1fr;
    gap: 34px;
  }
  .split__rail { position: static; }
  .facts { display: grid; grid-template-columns: repeat(2, 1fr); column-gap: 28px; }
  .split__body { max-width: none; }
}
@media (max-width: 700px) {
  body { font-size: 17.5px; }
  :root { --nav-h: 76px; }
  .section { padding: 68px 20px; }
  .facts { grid-template-columns: 1fr; }
  .prose { font-size: 17.5px; }
  .prose--lead { font-size: 20px; }
  .stage { grid-template-columns: 42px 1fr; gap: 18px; }
  .stage__n { width: 42px; height: 42px; font-size: 14px; }
  .stages::before { left: 20px; top: 21px; bottom: 21px; }
  .stage__body { padding-top: 6px; }
  .stage__body h3 { font-size: 18.5px; }
  .stage__body p { font-size: 17px; }
  .pull { font-size: 20px; padding-left: 20px; margin-bottom: 44px; }
  .section-head { margin-bottom: 38px; }
  .figure { margin-bottom: 40px; }
  .sub { font-size: 20px; margin-top: 48px; }
  .lede-sm { font-size: 17px; }
  .note { font-size: 16px; }
  .videos { grid-template-columns: 1fr; gap: 26px; }
  .clouds { grid-template-columns: 1fr; gap: 26px; }
  .clouds__cap { font-size: 14px; }
  .loss { grid-template-columns: 1fr; gap: 5px; padding: 14px 0; }
  .brand { gap: 11px; }
  .brand__iitm { height: 50px; }
  .brand__htic { height: 43px; }
  .brand__rule { height: 33px; }
  .nav__inner { padding: 0 18px; }

  .nav__links {
    gap: 20px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .nav__links::-webkit-scrollbar { display: none; }
  .nav__links a { white-space: nowrap; }

  .has-js .nav__toggle { display: grid; }
  .has-js .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
    padding: 4px 20px 12px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 14px 28px -20px rgba(18, 22, 28, .45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
  }
  .has-js .nav__links.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .has-js .nav__links a {
    font-size: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
  }
  .has-js .nav__links a:last-child { border-bottom: 0; }

  .has-js .nav__links a::after { display: none; }
  .has-js .nav__links a.is-active { color: var(--accent); }
  .hero { padding: 28px 20px 36px; }
  .hero__visual { width: 262px; margin: 22px auto 2px; }
  .hero__title { letter-spacing: -0.03em; }
  .venue { font-size: 11.5px; gap: 10px; }
  .actions { gap: 10px; }
  .btn { width: 100%; justify-content: flex-start; }
  .totop { right: 16px; bottom: 16px; width: 42px; height: 42px; }
  .foot__inner { grid-template-columns: 1fr; gap: 34px; padding: 44px 20px 36px; }
  .foot__logos { margin-top: 24px; gap: 13px; }
  .foot__iitm { height: 50px; }
  .foot__htic { height: 43px; }
  .foot__rule { height: 33px; }
  .foot__base { max-width: calc(100% - 40px); padding: 18px 0 34px; }
}

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

  .reveal { opacity: 1 !important; transform: none !important; }
}