:root {
  --ink: #000;
  --ink-2: #262626;
  --mute: #666;
  --canvas: #fff;
  --soft: #f4f4f4;
  --line: #d4d4d4;
  --line-strong: #000;
  --press: #333;
  --font: "Helvetica Neue", helvetica, arial, system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --ink: #fff;
    --ink-2: #e5e5e5;
    --mute: #a3a3a3;
    --canvas: #000;
    --soft: #111;
    --line: #333;
    --line-strong: #fff;
    --press: #d4d4d4;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 400 16px/1.45 var(--font);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding-inline: 24px;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--canvas);
  font: 500 15px/1 var(--font);
  letter-spacing: -0.15px;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color 100ms linear,
    color 100ms linear,
    border-color 100ms linear;
}

.btn:hover {
  background: var(--press);
  border-color: var(--press);
}

.btn.outline {
  background: var(--canvas);
  color: var(--ink);
}

.btn.outline:hover {
  background: var(--ink);
  color: var(--canvas);
  border-color: var(--ink);
}

.btn.small {
  min-height: 36px;
  padding: 8px 14px;
  font-size: 13px;
  letter-spacing: 0;
}

header {
  border-bottom: 1px solid var(--line-strong);
}

header .wrap {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  padding-block: 14px;
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.2px;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px 24px;
}

.nav a:not(.btn) {
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
}

.nav a:not(.btn):hover,
.nav a:not(.btn)[aria-current="page"] {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.hero .wrap {
  padding-block: 96px 80px;
}

h1 {
  margin: 0;
  max-width: 21ch;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: -1.68px;
  font-weight: 700;
  text-wrap: balance;
}

.lede {
  margin: 28px 0 36px;
  max-width: 52ch;
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink-2);
}

section.row {
  border-top: 1px solid var(--line-strong);
}

section.row.soft {
  background: var(--soft);
  border-bottom: 1px solid var(--line-strong);
}

.row .wrap {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: 24px;
  padding-block: 64px;
}

h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.15;
  letter-spacing: -0.44px;
  font-weight: 700;
}

.cells {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.cell {
  padding: 32px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.cell h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.35;
  font-weight: 500;
}

.cell p {
  margin: 0;
  color: var(--ink-2);
  font-size: 15px;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  border-top: 1px solid var(--line);
}

.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 8px;
  padding-block: 16px;
  border-bottom: 1px solid var(--line);
}

.steps li::before {
  content: counter(step);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.statement {
  margin: 0 0 24px;
  max-width: 32ch;
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.52px;
  font-weight: 500;
  text-wrap: balance;
}

.logos {
  margin: 28px 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  max-width: 62ch;
}

.logos .label {
  display: block;
  margin-bottom: 16px;
  color: var(--mute);
  font-size: 13px;
}

.marks {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 44px;
}

.logo {
  display: block;
  width: auto;
  height: 28px;
}

.logo.harvard {
  height: 40px;
}

.logo.mit {
  height: 32px;
}

.knock {
  fill: var(--canvas);
}

.note {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--mute);
  font-size: 15px;
}

.prose p {
  margin: 0;
  max-width: 62ch;
}

.prose p + p {
  margin-top: 16px;
}

.prose .mute {
  color: var(--mute);
  font-size: 15px;
}

.contact {
  background: var(--ink);
  color: var(--canvas);
}

.contact .wrap {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: 24px;
  padding-block: 80px;
}

.contact h2 {
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: -0.8px;
}

.contact p {
  margin: 0;
  max-width: 56ch;
}

.contact .btn {
  margin-top: 24px;
  background: var(--canvas);
  color: var(--ink);
  border-color: var(--canvas);
}

.contact .btn:hover {
  background: var(--ink);
  color: var(--canvas);
}

@media (width <= 1023px) {
  .cells {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (width <= 767px) {
  .wrap {
    padding-inline: 16px;
  }

  .hero .wrap {
    padding-block: 56px 48px;
  }

  h1 {
    font-size: 36px;
    letter-spacing: -0.9px;
  }

  .lede {
    font-size: 17px;
    margin: 20px 0 28px;
  }

  .row .wrap,
  .contact .wrap {
    grid-template-columns: 1fr;
    gap: 20px;
    padding-block: 48px;
  }

  .cells {
    grid-template-columns: 1fr;
  }

  .cell {
    padding: 24px;
  }

  .contact h2 {
    font-size: 26px;
  }

  .marks {
    gap: 16px 32px;
  }

  .logo {
    height: 24px;
  }

  .logo.harvard {
    height: 34px;
  }

  .logo.mit {
    height: 28px;
  }

  .statement {
    font-size: 21px;
    letter-spacing: -0.3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
}

.page .wrap {
  padding-block: 72px 80px;
}

.page h1 {
  font-size: 48px;
  letter-spacing: -1.44px;
}

.page .lede {
  margin-bottom: 0;
}

.example {
  margin-top: 24px;
  padding: 16px 20px;
  border: 1px solid var(--line-strong);
  max-width: 62ch;
  font-size: 15px;
  font-style: italic;
}

.table-wrap {
  overflow-x: auto;
}

table {
  table-layout: fixed;
  border-collapse: collapse;
  width: 100%;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

th,
td {
  text-align: left;
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  font-weight: 500;
  color: var(--mute);
  font-size: 13px;
}

@media (width <= 767px) {
  header .wrap {
    align-items: flex-start;
  }

  .nav {
    gap: 8px 16px;
  }

  .nav a:not(.btn) {
    font-size: 14px;
  }

  .page .wrap {
    padding-block: 48px 56px;
  }

  .page h1 {
    font-size: 34px;
    letter-spacing: -0.9px;
  }
}

footer .wrap {
  padding-block: 32px;
  color: var(--mute);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.social {
  display: flex;
  gap: 16px;
}

.soon {
  position: relative;
  display: inline-flex;
  padding: 6px;
  border: 0;
  background: none;
  color: var(--mute);
  cursor: default;
}

.soon svg {
  width: 18px;
  height: 18px;
}

.soon .tip {
  position: absolute;
  right: 0;
  bottom: calc(100% + 6px);
  padding: 4px 8px;
  background: var(--ink);
  color: var(--canvas);
  font-size: 12px;
  white-space: nowrap;
  visibility: hidden;
}

.soon:hover .tip,
.soon:focus-visible .tip,
.soon.open .tip {
  visibility: visible;
}

.contact :focus-visible {
  outline-color: var(--canvas);
}

.nav .btn[aria-current="page"] {
  background: var(--ink);
  color: var(--canvas);
}

.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--canvas);
  z-index: 1;
}

.skip:focus {
  top: 8px;
}

@media (width <= 767px) {
  header .wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    justify-content: flex-start;
  }

  .btn.small {
    min-height: 44px;
  }
}

.faq {
  border-top: 1px solid var(--line);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-block: 16px;
  font-size: 18px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  font-weight: 400;
}

.faq details[open] summary::after {
  content: "\2212";
}

.faq details p {
  margin: 0 0 20px;
  max-width: 62ch;
  color: var(--ink-2);
}

.report .wrap {
  padding-block: 40px;
}

.facts {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 8px 16px;
  margin: 0 0 20px;
  font-size: 15px;
}

.facts dt {
  color: var(--mute);
}

.facts dd {
  margin: 0;
}

.plain {
  margin: 0 0 16px;
  padding-left: 1.2em;
}

.plain li + li {
  margin-top: 6px;
}

@media (width <= 767px) {
  .report .wrap {
    padding-block: 32px;
  }

  .facts {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .facts dd + dt {
    margin-top: 10px;
  }
}

.logo-mark {
  width: 30px;
  height: 30px;
  fill: currentcolor;
}

.mailto {
  margin: 0 0 16px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.8px;
}

.mailto a {
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
}

th.num,
td.num {
  width: 8rem;
  padding-right: 0;
}