/* ---------- controls ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-xs);
  min-height: 48px; padding: 0 var(--space-lg);
  border: 0; border-radius: var(--radius-pill);
  background: var(--color-accent); color: var(--color-accent-ink);
  font: 400 var(--text-md)/1 var(--font-body); text-decoration: none; cursor: pointer;
  transition: background var(--dur-short) var(--ease-out), box-shadow var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out);
}
.btn:hover { background: var(--color-accent-hi); }
.btn:active { transform: translateY(1px); }
.btn--line { background: transparent; color: var(--color-ink); box-shadow: inset 0 0 0 var(--rule-hair) var(--color-rule-2); }
.btn--line:hover { background: var(--color-paper-2); box-shadow: inset 0 0 0 var(--rule-hair) var(--color-muted); }

.more {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 var(--space-lg);
  margin-top: var(--space-lg);
  color: var(--color-ink); text-decoration: none; font-size: var(--text-md);
  border-radius: var(--radius-pill); background: transparent;
  box-shadow: inset 0 0 0 var(--rule-hair) var(--color-rule-2);
  transform-origin: left center;
  transition: background var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out), box-shadow var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out);
}
.more:hover, .more:focus-visible {
  background: var(--color-accent); color: var(--color-accent-ink);
  box-shadow: inset 0 0 0 var(--rule-hair) var(--color-accent);
  transform: scale(1.04);
}

/* ---------- nav: three parts ---------- */
.nav {
  position: fixed; inset: 0 0 auto; z-index: var(--z-sticky-nav);
  height: 76px;
  transition: background var(--dur-long) var(--ease-out), box-shadow var(--dur-long) var(--ease-out);
}
.nav.is-scrolled {
  background: color-mix(in oklab, var(--color-paper) 92%, transparent);
  box-shadow: inset 0 calc(-1 * var(--rule-hair)) 0 var(--color-rule);
  backdrop-filter: blur(6px);
}
.nav__in { position: relative; height: 100%; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: var(--space-lg); }
.wordmark {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  font: 400 1.0625rem/1 var(--font-display); letter-spacing: 0.01em;
  text-decoration: none; justify-self: start; white-space: nowrap;
}
.wordmark__mark { display: grid; grid-template-columns: repeat(3, 4px); gap: var(--space-2xs); transform: skewX(-18deg); }
.wordmark__mark i { width: 4px; height: 12px; border-radius: 1px; background: var(--color-ink); }
.wordmark__mark i:nth-child(2) { background: var(--color-muted); }
.wordmark__mark i:nth-child(3) { background: var(--color-accent); }
.nav__links { display: flex; gap: var(--space-xl); font-size: var(--text-sm); }
.nav__quiet { color: var(--color-ink-2); text-decoration: none; transition: color var(--dur-short) var(--ease-out); }
.nav__quiet:hover { color: var(--color-ink); }
.nav__links a {
  color: var(--color-ink-2); text-decoration: none;
  padding: 8px var(--space-sm); margin-inline: calc(-1 * var(--space-sm));
  border-radius: var(--radius-pill);
  transition: color var(--dur-short) var(--ease-out), background var(--dur-short) var(--ease-out);
}
.nav__links a:hover, .nav__links a:focus-visible { color: var(--color-accent-ink); background: var(--color-accent); }
.nav__end { justify-self: end; display: flex; align-items: center; gap: var(--space-lg); font-size: var(--text-sm); }
.nav__mobile { display: none; }
.nav__mobile summary { list-style: none; cursor: pointer; color: var(--color-ink); }
.nav__mobile summary::-webkit-details-marker { display: none; }
.nav__mobile summary span { color: var(--color-accent); }
.nav__mobile-links { position: absolute; top: 100%; right: var(--gutter); z-index: 2; display: grid; width: min(360px, calc(100vw - 2 * var(--gutter))); padding: var(--space-sm); border: var(--rule-hair) solid var(--color-rule-2); background: var(--color-paper-2); box-shadow: 0 16px 36px rgba(0,0,0,.28); }
.nav__mobile-links a { padding: var(--space-sm) var(--space-md); color: var(--color-ink); text-decoration: none; }
.nav__mobile-links a:hover, .nav__mobile-links a:focus-visible { background: var(--color-paper-3); color: var(--color-accent); }

/* ---------- hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: grid; align-items: center;
  overflow: hidden; isolation: isolate;
  padding-block: 76px 0;
}
.hero__cloud, .hero__still {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1;
  -webkit-mask-image: radial-gradient(ellipse 72% 78% at 68% 46%, var(--color-ink) 55%, transparent 100%);
  mask-image: radial-gradient(ellipse 72% 78% at 68% 46%, var(--color-ink) 55%, transparent 100%);
}
.hero__still { overflow: hidden; }
.hero__still::before {
  content: ""; position: absolute; inset: 0; opacity: 0.4;
  background-image:
    radial-gradient(circle, var(--point-mid) 0.8px, transparent 1.2px),
    radial-gradient(circle, var(--point-lo) 0.8px, transparent 1.2px);
  background-size: 7px 9px, 11px 13px; background-position: 0 0, 3px 5px;
}
.cloud-on .hero__still { display: none; }

.hero__grid { padding-block: var(--space-3xl) var(--space-2xl); }
.hero__text { max-width: 640px; }
.hero__text h1 { font-size: var(--text-display); max-width: 100%; line-height: 1.14; min-height: 2.28em; letter-spacing: -0.055em; }
.caret { display: inline-block; width: 2px; height: 0.92em; margin-left: 0.1em; vertical-align: -0.08em; background: var(--color-accent); animation: caret-blink 1s steps(1, end) infinite; }
@keyframes caret-blink { 50% { opacity: 0; } }
[data-typer-lead] { min-height: 1.75em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-xl); }

.readout {
  width: fit-content; display: grid; grid-template-columns: repeat(4, auto); justify-content: start;
  margin: var(--space-2xl) 0 0; padding: var(--space-md) var(--space-lg);
}
.readout div { padding-inline: var(--space-lg); box-shadow: inset calc(-1 * var(--rule-hair)) 0 0 var(--color-rule); }
.readout div:first-child { padding-left: 0; }
.readout div:last-child { box-shadow: none; padding-right: 0; }
.readout dt { font-size: var(--text-xs); color: var(--color-muted); }
.readout dd { margin: var(--space-2xs) 0 0; font-size: var(--text-xl); letter-spacing: -0.01em; color: var(--color-ink); }

.hero__note {
  position: absolute; left: var(--gutter); bottom: var(--space-xl);
  font-size: var(--text-xs); color: var(--color-muted);
}
.layers {
  position: absolute; right: var(--gutter); bottom: var(--space-xl);
  display: flex; gap: var(--space-xl);
  list-style: none; margin: 0; padding: 0; z-index: 2;
}
.switch { display: inline-flex; align-items: center; gap: var(--space-sm); cursor: pointer; position: relative; }
.switch__name { font-size: var(--text-sm); color: var(--color-ink-2); white-space: nowrap; }
.switch input { position: absolute; opacity: 0; width: 36px; height: 20px; right: 0; margin: 0; cursor: pointer; }
.switch__track {
  position: relative; width: 36px; height: 20px; border-radius: var(--radius-pill);
  box-shadow: inset 0 0 0 var(--rule-hair) var(--color-rule-2); background: var(--color-paper-2);
  transition: background var(--dur-short) var(--ease-out);
}
.switch__track::after {
  content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--color-muted); transition: transform var(--dur-short) var(--ease-out), background var(--dur-short) var(--ease-out);
}
.switch input:checked + .switch__track { background: var(--color-ink); box-shadow: none; }
.switch input:checked + .switch__track::after { transform: translateX(16px); background: var(--color-paper); }
.switch--found input:checked + .switch__track { background: var(--color-accent); }
.switch--found input:checked + .switch__track::after { background: var(--color-accent-ink); }
.switch input:focus-visible + .switch__track { outline: 2px solid var(--color-focus); outline-offset: 3px; }
.switch:hover .switch__track { box-shadow: inset 0 0 0 var(--rule-hair) var(--color-muted); }

/* callouts that follow the cloud */
.hero__marks { position: absolute; inset: 0; z-index: 1; pointer-events: none; }
.mark { position: absolute; left: 0; top: 0; will-change: transform; transition: opacity var(--dur-long) var(--ease-out); }
.mark.is-hidden { opacity: 0; }
.mark__dot {
  position: absolute; left: -3.5px; top: -3.5px; width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-ink); box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-paper) 70%, transparent);
}
.mark__leader { position: absolute; left: 0; bottom: 0; width: var(--rule-hair); height: 64px; background: color-mix(in oklab, var(--color-ink) 55%, transparent); }
.mark__note {
  position: absolute; left: 0; bottom: 64px; display: grid; gap: var(--space-3xs);
  padding: var(--space-xs) var(--space-sm); white-space: nowrap;
  font-size: var(--text-xs); color: var(--color-ink-2);
  background: color-mix(in oklab, var(--color-paper) 84%, transparent);
  box-shadow: inset var(--rule-hair) 0 0 color-mix(in oklab, var(--color-ink) 55%, transparent);
}
.mark__note b { font-size: var(--text-md); font-weight: 400; color: var(--color-ink); }
.mark.is-flip .mark__note { left: auto; right: 0; text-align: right; box-shadow: inset calc(-1 * var(--rule-hair)) 0 0 color-mix(in oklab, var(--color-ink) 55%, transparent); }
.mark--found .mark__dot { background: var(--color-accent); }
.mark--found .mark__leader { background: var(--color-accent); }
.mark--found .mark__note { box-shadow: inset var(--rule-hair) 0 0 var(--color-accent); }
.mark--found.is-flip .mark__note { box-shadow: inset calc(-1 * var(--rule-hair)) 0 0 var(--color-accent); }

/* ---------- chapters ---------- */
main > section:not(.hero) { padding-block: var(--section-gap) 0; }
.chapter__grid {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--space-3xl); align-items: center;
}
.chapter--flip .chapter__grid { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.chapter--flip .chapter__text { order: 2; }
.chapter--flip .panel { order: 1; }
.chapter__text h2 + .lead { margin-top: var(--space-md); }

.panel {
  margin: 0; padding: var(--space-lg);
  background: color-mix(in oklab, var(--color-paper-2) 55%, transparent);
  display: grid; gap: var(--space-lg); align-content: start;
}
.panel > figcaption { display: flex; justify-content: space-between; gap: var(--space-md); font-size: var(--text-xs); color: var(--color-muted); }
.panel__note { font-size: var(--text-xs); color: var(--color-muted); line-height: 1.6; }

/* chain: the AI section's instrument */
.chain { list-style: none; margin: 0; padding: 0; }
.chain li {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-sm) var(--space-lg); align-items: baseline;
  padding: var(--space-md) 0 var(--space-lg);
  border-top: var(--rule-hair) solid var(--color-rule);
}
.chain__i { font-size: var(--text-xs); color: var(--color-muted); align-self: start; padding-top: 0.35em; }
.chain__n { font-size: var(--text-lg); color: var(--color-ink); letter-spacing: -0.005em; display: grid; gap: var(--space-2xs); }
.chain__n em { font-style: normal; font-size: var(--text-sm); font-weight: 300; color: var(--color-muted); line-height: 1.6; }
.chain__s { font-size: var(--text-xs); color: var(--color-muted); }

/* cut: the print section's instrument */
.cut, .print { display: block; width: 100%; aspect-ratio: 4 / 3; background: transparent; }
.spec { margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-md); border-top: var(--rule-hair) solid var(--color-rule); }
.spec div { display: grid; gap: var(--space-3xs); padding-top: var(--space-sm); }
.spec dt { font-size: var(--text-xs); color: var(--color-muted); }
.spec dd { margin: 0; font-size: var(--text-md); color: var(--color-ink-2); }

/* path: the hybrid section's instrument */
.path {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-md);
  position: relative;
}
.path::before {
  content: ""; position: absolute; left: 0; right: 0; top: 3px;
  height: var(--rule-hair); background: var(--color-rule-2);
}
.path li { display: grid; gap: var(--space-xs); align-content: start; padding-top: 0; }
.path__d { position: relative; width: 7px; height: 7px; border-radius: 50%; background: var(--color-ink-2); margin-bottom: var(--space-sm); }
.path li:last-child .path__d { background: var(--color-accent); }
.path__n { font-size: var(--text-md); color: var(--color-ink); }
.path__t { font-size: var(--text-sm); color: var(--color-muted); line-height: 1.65; }

/* ---------- board ---------- */
.board__head { display: flex; justify-content: space-between; align-items: end; gap: var(--space-xl); flex-wrap: wrap; }
.board__head .lead { margin: 0; }
.slots { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-lg); margin-top: var(--space-2xl); }
.slot {
  aspect-ratio: 16 / 10; margin: 0; padding: var(--space-lg);
  display: grid; align-content: space-between; gap: var(--space-md);
  background: color-mix(in oklab, var(--color-paper-2) 45%, transparent);
}
.slots a.slot { text-decoration: none; }
.slots a.slot:hover { background: var(--color-paper-2); }
.slot__k { font-size: var(--text-sm); color: var(--color-ink-2); }
.slot__title { font: 400 var(--text-lg)/1.35 var(--font-head); color: var(--color-ink); }
.slot__e { font-size: var(--text-xs); color: var(--color-muted); align-self: end; }
.slots a.slot:hover .slot__e { color: var(--color-accent); }

/* ---------- journal ---------- */
.journal__head { display: flex; justify-content: space-between; align-items: end; gap: var(--space-xl); flex-wrap: wrap; }
.journal__head .lead { margin: 0; }
.table-wrap { margin-top: var(--space-2xl); overflow-x: auto; }
.log { width: 100%; border-collapse: collapse; font-size: var(--text-md); min-width: 720px; }
.log th {
  padding: 0 var(--space-md) var(--space-sm) 0; text-align: left; font-weight: 400;
  font-size: var(--text-xs); color: var(--color-muted);
  border-bottom: var(--rule-hair) solid var(--color-rule-2); white-space: nowrap;
}
.log td {
  padding: var(--space-lg) var(--space-md) var(--space-lg) 0;
  border-bottom: var(--rule-hair) solid var(--color-rule);
  color: var(--color-ink-2); vertical-align: baseline;
}
.log td:first-child { color: var(--color-ink); font-size: var(--text-lg); width: 72px; }
.log td:nth-child(2) { color: var(--color-muted); white-space: nowrap; }
.log td:last-child { color: var(--color-muted); white-space: nowrap; }
.log tbody tr { transition: background var(--dur-short) var(--ease-out); }
.log tbody tr:hover { background: var(--color-paper-2); }
.log a { color: var(--color-ink); text-decoration: none; }
.log a:hover { color: var(--color-accent); }

/* ---------- contact ---------- */
.contact__grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: var(--space-3xl); align-items: start; }
.facts { margin: 0; border-top: var(--rule-hair) solid var(--color-rule); }
.facts div { display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-lg); padding: var(--space-md) 0; border-bottom: var(--rule-hair) solid var(--color-rule); }
.facts dt { color: var(--color-ink-2); font-size: var(--text-sm); }
.facts dd { margin: 0; font-size: var(--text-md); color: var(--color-muted); overflow-wrap: anywhere; text-align: right; }
.facts dd a { color: var(--color-ink); text-decoration: none; }
.facts dd a:hover { color: var(--color-accent); }

/* ---------- footer ---------- */
.foot { padding-block: var(--space-3xl) var(--space-xl); border-top: var(--rule-hair) solid var(--color-rule); margin-top: var(--section-gap); }
.foot__mark {
  position: relative; margin: 0; height: clamp(4.5rem, 18vw, 15rem);
  font: 200 clamp(3.5rem, 17vw, 15rem)/0.86 var(--font-display); letter-spacing: -0.05em;
  color: var(--color-paper-3); white-space: nowrap; overflow: hidden;
}
.foot__mark canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.foot__mark.is-on { color: transparent; }
.foot__row {
  display: flex; justify-content: space-between; align-items: center; gap: var(--space-lg); flex-wrap: wrap;
  margin-top: var(--space-xl); padding-top: var(--space-lg);
  border-top: var(--rule-hair) solid var(--color-rule);
}
.foot__copyright { font-size: var(--text-xs); color: var(--color-muted); }
.foot__legal { display: flex; flex-wrap: wrap; gap: var(--space-sm) var(--space-lg); font-size: var(--text-xs); color: var(--color-muted); }
.foot__legal a { color: inherit; text-decoration: none; }
.foot__legal a:hover { color: var(--color-ink); }

/* ---------- entrances ---------- */
@media (prefers-reduced-motion: no-preference) {
  .hero__text > * { animation: rise var(--dur-long) var(--ease-out) both; }
  .hero__text > :nth-child(2) { animation-delay: 80ms; }
  .hero__text > :nth-child(3) { animation-delay: 160ms; }
  .hero__text > :nth-child(4) { animation-delay: 240ms; }
  .hero__marks { animation: fadein 1200ms var(--ease-out) 900ms both; }
}
@keyframes rise { from { opacity: 0; transform: translateY(12px); } }
@keyframes fadein { from { opacity: 0; } }

/* ---------- responsive ---------- */
@media (max-width: 75rem) {
  .nav__links { gap: var(--space-lg); }
  .chapter__grid { gap: var(--space-2xl); }
}
@media (max-width: 60rem) {
  .nav__links { display: none; }
  .nav__mobile { display: block; }
  .nav__in { grid-template-columns: 1fr auto; }
  .hero { display: flex; flex-direction: column; min-height: auto; align-items: stretch; padding-block: 96px 0; }
  .hero__grid { order: 1; padding-block: 0; }
  .hero__cloud, .hero__still {
    order: 2; position: static; inset: auto; width: 100%; height: 64vw; min-height: 300px;
    margin-top: var(--space-lg);
    -webkit-mask-image: none; mask-image: none;
  }
  .hero__still { display: none; }
  .hero__note, .hero__marks { display: none; }
  .layers { position: static; order: 3; padding: var(--space-lg) var(--gutter) var(--space-2xl); justify-content: flex-start; flex-wrap: wrap; gap: var(--space-lg); }
  .hero__note { position: static; order: 4; padding: 0 var(--gutter); }
  .chapter__grid, .chapter--flip .chapter__grid, .contact__grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); }
  .chapter--flip .chapter__text, .chapter--flip .panel { order: 0; }
  .slots { grid-template-columns: minmax(0, 1fr); }
  .slot { aspect-ratio: 16 / 9; }
  .readout { grid-template-columns: repeat(2, auto); row-gap: var(--space-md); padding: var(--space-md); }
  .readout div:nth-child(2) { box-shadow: none; }
  .readout div:nth-child(3) { padding-left: 0; }
}
@media (max-width: 40rem) {
  .path { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-lg) var(--space-md); }
  .path::before { display: none; }
  .path__d { margin-bottom: var(--space-xs); }
  .spec { grid-template-columns: minmax(0, 1fr); }
  .log { min-width: 0; }
  .log thead { display: none; }
  .log tbody tr { display: grid; grid-template-columns: auto 1fr; column-gap: var(--space-md); padding: var(--space-md) 0; border-bottom: var(--rule-hair) solid var(--color-rule); }
  .log td { padding: 0; border: 0; }
  .log td:nth-child(4) { grid-column: 2; color: var(--color-ink); }
  .log td:nth-child(5) { grid-column: 2; font-size: var(--text-sm); }
  .log td:nth-child(2), .log td:nth-child(3) { display: none; }
  .foot__mark { font-size: clamp(3rem, 16vw, 6rem); }
  .foot__row { align-items: flex-start; }
}

/* touch: no hover, so the three entries are buttons outright */
@media (max-width: 60rem) {
  .more {
    background: var(--color-accent); color: var(--color-accent-ink);
    box-shadow: none; margin-left: 0; padding: 0 var(--space-lg);
  }
}
/* picks: three representative projects in the AI chapter */
.picks { list-style: none; margin: 0; padding: 0; }
.picks li { border-top: var(--rule-hair) solid var(--color-rule); }
.pick {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-sm) var(--space-lg); align-items: baseline;
  padding: var(--space-md) 0 var(--space-lg); text-decoration: none;
  transition: background var(--dur-short) var(--ease-out);
}
.pick:hover { background: color-mix(in oklab, var(--color-ink) 5%, transparent); }
.pick__n { font-size: var(--text-xs); color: var(--color-muted); }
.pick__h { display: block; font-size: var(--text-lg); color: var(--color-ink); letter-spacing: -0.005em; }
.pick__e { display: block; margin-top: 4px; font-size: var(--text-sm); color: var(--color-muted); line-height: 1.6; }
.pick__d { font-size: var(--text-sm); color: var(--color-muted); }
.pick:hover .pick__h { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }

/* Let the printer point cloud dissolve into the section background. */
.panel--print { background: transparent; padding-inline: 0; }
.panel--print .print {
  -webkit-mask-image: radial-gradient(ellipse 100% 90% at 50% 52%, var(--color-ink) 55%, transparent 100%);
  mask-image: radial-gradient(ellipse 100% 90% at 50% 52%, var(--color-ink) 55%, transparent 100%);
}