/* fahm.ai
   Colour carries the thesis: ochre is language a person wrote,
   indigo and lapis are everything the factory derived from it.
   Monospace appears on identifiers only, because identifiers are machine objects. */

:root {
  --paper:  #E7E9E6;
  --ink:    #1B2440;
  --lapis:  #2F4FA0;
  --ochre:  #A8702A;
  --slate:  #6C7484;
  --rule:   #CDD1CC;

  --measure: 62ch;
  --gutter: clamp(20px, 5vw, 56px);

  --sans: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --naskh: "Amiri", "Geeza Pro", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:  #141B2B;
    --ink:    #E4E7E2;
    --lapis:  #8FA8EC;
    --ochre:  #D8A45E;
    --slate:  #98A0B0;
    --rule:   #2C3548;
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

a { color: var(--lapis); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

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

.masthead,
main > section,
footer {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-block: calc(env(safe-area-inset-top, 0px) + 28px) 0;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}
.wordmark-ar {
  font-family: var(--naskh);
  font-size: 1.85rem;
  line-height: 1;
  color: var(--ink);
}
.wordmark-la {
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--slate);
}

.masthead-nav { display: flex; gap: 22px; font-size: 0.9375rem; align-items: baseline; }

/* Sign in is an action, not a reference: it gets weight the other links don't. */
.masthead-nav .signin {
  color: var(--ink);
  font-weight: 500;
  text-decoration-color: var(--lapis);
}

/* ---------- hero ---------- */

.opening { padding-block: clamp(56px, 11vh, 108px) clamp(56px, 10vh, 96px); }

.opening h1 {
  margin: 0 0 clamp(40px, 7vh, 72px);
  max-width: 21ch;
  font-size: clamp(2.35rem, 6.4vw, 4.15rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.032em;
  text-wrap: balance;
}

.opening-lede {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(1.05rem, 1.55vw, 1.25rem);
  line-height: 1.5;
  color: var(--slate);
}

.derived-note {
  margin-top: 18px;
  margin-bottom: 30px;
  font-size: 0.875rem;
  color: var(--slate);
}

.chain {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.chain li {
  --d: 0;
  position: relative;
  padding-left: calc(var(--d) * 15px + 20px);
  padding-block: 5px;
  font-size: 0.8125rem;
  line-height: 1.5;
}
.chain li::before {
  content: "";
  position: absolute;
  left: calc(var(--d) * 15px);
  top: 0.95em;
  width: 11px;
  height: 1px;
  background: var(--lapis);
}
.chain li[data-depth="1"] { --d: 1; }
.chain li[data-depth="2"] { --d: 2; }
.chain li[data-depth="3"] { --d: 3; }
.chain li[data-depth="4"] { --d: 4; }
.chain li[data-depth="5"] { --d: 5; }
.chain li[data-depth="6"] { --d: 6; }
.chain li[data-depth="7"] { --d: 7; }
.chain li[data-depth="8"] { --d: 8; }

.chain b {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.015em;
  color: var(--lapis);
}
.chain span { color: var(--slate); margin-left: 9px; }
.chain .chain-end b { color: var(--ink); }
.chain .chain-end span { color: var(--ink); }

.chain-animating li { opacity: 0; animation: settle 420ms cubic-bezier(.2,.7,.3,1) forwards; }
@keyframes settle {
  from { opacity: 0; transform: translateX(-7px); }
  to   { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .chain-animating li { opacity: 1; animation: none; }
}

/* ---------- the question ---------- */

.question {
  padding-block: clamp(56px, 9vh, 92px);
  border-top: 1px solid var(--rule);
}

h2 {
  margin: 0 0 28px;
  max-width: 30ch;
  font-size: clamp(1.5rem, 2.9vw, 2.1rem);
  font-weight: 500;
  line-height: 1.16;
  letter-spacing: -0.022em;
}

.body { max-width: var(--measure); margin: 0 0 26px; }

.close { margin: 34px 0 22px; }

.action {
  display: inline-block;
  padding: 13px 24px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--paper);
  background: var(--ink);
  border-radius: 6px;
  text-decoration: none;
}
.action:hover { background: var(--lapis); }

.impact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 26px 20px;
  margin: 36px 0 40px;
  padding-block: 30px;
  border-block: 1px solid var(--rule);
}
.impact dt {
  font-family: var(--mono);
  font-size: 1.75rem;
  font-weight: 400;
  line-height: 1;
  color: var(--lapis);
}
.impact dd {
  margin: 9px 0 0;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--slate);
}

/* ---------- what it connects to ---------- */

.tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 26px 28px;
  margin: 36px 0 32px;
  padding-block: 30px;
  border-block: 1px solid var(--rule);
}
.tools dt {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.008em;
  margin-bottom: 8px;
}
.tools dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.45;
  color: var(--slate);
}
/* Which connector exists today, distinct from what the category covers. */
.tools .eg {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  color: var(--lapis);
}

/* ---------- tenets ---------- */

.tenets {
  padding-block: clamp(56px, 9vh, 92px);
  border-top: 1px solid var(--rule);
}
.tenets dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: clamp(32px, 4vw, 54px);
  margin: 0;
}
.tenets dt {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: -0.008em;
  margin-bottom: 12px;
}
.tenets dd { margin: 0; font-size: 0.96rem; color: var(--slate); }

/* ---------- progress ---------- */

.progress {
  padding-block: clamp(56px, 9vh, 92px);
  border-top: 1px solid var(--rule);
}
.steps {
  margin: 34px 0 34px;
  padding: 0;
  list-style: none;
  max-width: 660px;
}
.steps li {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 18px;
  padding-block: 11px;
  border-top: 1px solid var(--rule);
  align-items: baseline;
}
.steps li:last-child { border-bottom: 1px solid var(--rule); }
.steps .state {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  color: var(--slate);
}
.steps .done .state { color: var(--lapis); }
.steps .what { font-size: 0.96rem; color: var(--slate); }
.steps .done .what { color: var(--ink); }

/* ---------- footer ---------- */

footer {
  padding-block: 40px calc(env(safe-area-inset-bottom, 0px) + 52px);
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px 32px;
  font-size: 0.9375rem;
  color: var(--slate);
}
footer p { margin: 0; }
footer .meaning span { font-family: var(--naskh); font-size: 1.45rem; color: var(--ink); }
footer .meaning i { font-style: italic; }
footer .contact { display: flex; gap: 26px; flex-wrap: wrap; }

/* ---------- narrow ---------- */

@media (max-width: 760px) {
  .chain li { font-size: 0.78rem; }
  .chain li { padding-left: calc(var(--d) * 11px + 18px); }
  .chain li::before { left: calc(var(--d) * 11px); }
}