/* AI for Knowledge - one stylesheet, tokens first. */

/* Fonts are hosted on the site, latin subset only. Licenses in assets/fonts/. */
@font-face {
  font-family: "Public Sans";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("/assets/fonts/public-sans-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("/assets/fonts/source-serif-4-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  color-scheme: light;

  --paper:        #F4F6F4;
  --paper-deep:   #EAEEEC;
  --surface:      #FFFFFF;
  --ink:          #16242B;
  --ink-2:        #4A5C64;
  --ink-3:        #5C6E75;
  --rule:         #D0D8D6;
  --rule-strong:  #AFBCB8;
  --petrol:       #0E5866;
  --petrol-dark:  #0A414C;
  --petrol-wash:  #E7EEED;
  --ok:           #2E6B4F;

  --sans:  "Public Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", Times, serif;

  --page: 72rem;
  --radius: 3px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.65 var(--sans);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; display: block; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }

a { color: var(--petrol); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--petrol-dark); }

button, input, textarea { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--petrol);
  outline-offset: 2px;
  border-radius: 1px;
}
.btn--primary:focus-visible { outline-color: var(--ink); }
::selection { background: var(--petrol); color: #fff; }

/* --- Layout --------------------------------------------------------------- */

.wrap { width: 100%; max-width: var(--page); margin-inline: auto; padding-inline: 1.5rem; }

.section { padding-block: 3rem; border-top: 1px solid var(--rule); }

.skip-link {
  position: absolute; left: 1rem; top: -3rem; z-index: 60;
  background: var(--ink); color: #fff; padding: .6rem 1rem;
  border-radius: var(--radius); text-decoration: none;
}
.skip-link:focus { top: 1rem; color: #fff; }

/* --- Type ----------------------------------------------------------------- */

.display-1 {
  font: 600 clamp(2.05rem, 4.2vw, 3.3rem)/1.08 var(--serif);
  letter-spacing: -.02em;
  text-wrap: balance;
  max-width: 17em;
}
.display-2 {
  font: 600 clamp(1.7rem, 3vw, 2.2rem)/1.15 var(--serif);
  letter-spacing: -.015em;
  text-wrap: balance;
}
.heading-2 {
  font: 600 clamp(1.35rem, 2.4vw, 1.6rem)/1.25 var(--serif);
  letter-spacing: -.01em;
}
.heading-3 { font: 700 1rem/1.4 var(--sans); }

.lede {
  margin-top: 1.25rem;
  font: 400 clamp(1.06rem, 1.6vw, 1.18rem)/1.6 var(--serif);
  color: var(--ink-2);
  text-wrap: pretty;
  max-width: 36em;
}
.meta { font: 500 .8125rem/1.5 var(--sans); color: var(--ink-2); }
.meta--kicker { margin-bottom: .75rem; }
.muted { color: var(--ink-2); }

.stack > * + * { margin-top: 1rem; }

/* --- Header --------------------------------------------------------------- */

.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap { display: flex; align-items: baseline; gap: 1rem; padding-block: 1.1rem; }

.wordmark {
  font: 600 1.05rem/1.2 var(--serif);
  color: var(--ink); text-decoration: none; letter-spacing: -.012em;
}
.wordmark:hover { color: var(--petrol-dark); }
.site-header .meta { margin-left: auto; }

/* --- Hero ----------------------------------------------------------------- */

/* The padding follows the screen height, so the hero and the form fit on a laptop screen. */
.hero { padding-block: clamp(2.5rem, 9vh, 6rem); }

/* Text on the left, the waitlist form on the right. Below 56rem, the form goes under the text. */
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(19rem, 25rem);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}
.hero__form .heading-2 { margin-bottom: 1.25rem; text-wrap: balance; }

/* --- Buttons -------------------------------------------------------------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font: 600 .9375rem/1 var(--sans);
  min-height: 44px; padding: .85rem 1.3rem;
  border: 1px solid transparent; border-radius: var(--radius);
  text-decoration: none; cursor: pointer;
  transition: background-color .15s var(--ease), border-color .15s var(--ease);
}
.btn--primary { background: var(--petrol); color: #fff; }
.btn--primary:hover { background: var(--petrol-dark); color: #fff; }
.btn--secondary { background: var(--surface); color: var(--ink); border-color: var(--rule-strong); }
.btn--secondary:hover { border-color: var(--ink-2); color: var(--ink); }

/* --- Form ----------------------------------------------------------------- */

.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.6rem;
}

.field { display: block; }
.field + .field { margin-top: 1.1rem; }
.field__label { display: block; font: 600 .875rem/1.4 var(--sans); margin-bottom: .3rem; }
.field__hint { display: block; font: 400 .8125rem/1.5 var(--sans); color: var(--ink-2); margin-bottom: .45rem; }

.input, .textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  padding: .75rem .85rem;
  font: 400 1rem/1.5 var(--sans);
  color: var(--ink);
  min-height: 44px;
}
.textarea { resize: vertical; min-height: 6rem; line-height: 1.6; }
.input:hover, .textarea:hover { border-color: var(--ink-3); }

.form-foot { margin-top: 1.4rem; display: flex; flex-wrap: wrap; gap: .9rem 1.25rem; align-items: center; }

/* --- Lists ---------------------------------------------------------------- */

.topics { border-top: 1px solid var(--rule); margin-top: 1.25rem; }
.topics li {
  display: grid; grid-template-columns: 9.5rem 1fr; gap: 1.25rem;
  padding: .85rem 0; border-bottom: 1px solid var(--rule);
}
.topics dt, .topics b { font: 600 .875rem/1.5 var(--sans); color: var(--petrol); }
.topics span { color: var(--ink-2); font-size: .9375rem; }

.plain-list { margin-top: 1rem; display: flex; flex-direction: column; gap: .5rem; }
.plain-list li {
  padding-left: 1.35rem; position: relative;
  color: var(--ink-2); font-size: .9375rem;
}
.plain-list li::before {
  content: ""; position: absolute; left: .2rem; top: .68em;
  width: .4rem; height: 1px; background: var(--rule-strong);
}

/* --- Confirmation --------------------------------------------------------- */

.confirm { padding-block: 4.5rem 2.5rem; }
.confirm__mark {
  width: 2.75rem; height: 2.75rem; margin-bottom: 1.5rem;
  color: var(--ok);
}
.next-steps { border-top: 1px solid var(--rule); margin-top: 1.5rem; }
.next-steps li {
  padding: .95rem 0; border-bottom: 1px solid var(--rule);
  display: grid; grid-template-columns: 1.5rem 1fr; gap: 1rem;
  font-size: .9375rem; color: var(--ink-2);
}
.next-steps b { color: var(--ink); font-weight: 600; }
.next-steps .num { color: var(--petrol); font-weight: 600; font-variant-numeric: tabular-nums; }

/* --- Footer --------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding-block: 2rem 2.5rem;
  font: 500 .8125rem/1.6 var(--sans);
  color: var(--ink-2);
}
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }

/* --- Responsive and motion ------------------------------------------------ */

@media (max-width: 56rem) {
  .hero__grid { grid-template-columns: 1fr; }
}

@media (max-width: 34rem) {
  .hero { padding-block: 2rem; }
  .section { padding-block: 2.25rem; }
  .topics li { grid-template-columns: 1fr; gap: .2rem; }
  .panel { padding: 1.25rem; }
  .site-header .meta { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}