/* ─────────────────────────────────────────────
   Black Box · the product and how it got built
   Theme: DG (../dg-theme.css), the same tokens and ink tiers as the résumé:
   neutral-10 (primary) · neutral-8 (secondary) · neutral-7 (meta). Gold stays
   decorative. Screens come from the app's synthetic demo only.
   ───────────────────────────────────────────── */

:root {
  /* Layout structure (pad-x and header-h feed the shared navigation.css) */
  --gut: clamp(var(--space-m), 0.7rem + 2.6vw, 3.25rem);
  --pad-x: clamp(var(--space-m), 6vw, 96px);
  --header-h: 56px;
  --edge: inset 0 0 0 var(--border-s) var(--neutral-4);
  --section-gap: calc(var(--space-xxl) + var(--space-xl));
  --phone-w: 300px;
  /* Containers draw a white outline (ink in light mode) and nothing else. */
  --outline: inset 0 0 0 var(--border-s) var(--neutral-10);
  /* Grids with dividers: each cell draws a ring the width of the gap, and the grid clips the outer edge,
     so only the lines between cells show. */
  --divider: var(--neutral-4);
  --cell-ring: 0 0 0 var(--border-s) var(--divider);
  /* Theme gap: DG has no step darker than the page, so the active prompt's fill is the page color, darkened. */
  --well: color-mix(in srgb, var(--neutral-1) 72%, #000);
}

/* On the white page, "a shade darker" is the theme's own step. */
[data-theme="light"] { --well: var(--neutral-3); }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
  #scroll-progress, .glide-bar { display: none; }
}

/* ── Motion: the homepage's scroll hairline and section entrances, the players' gliding highlight ─────────────
   Gold means "how far": how far down the page, how far through a clip or a state. */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-1);
  transform: scaleX(0);
  transform-origin: left;
  z-index: 60;
}
/* Entrances: fade and rise once, parts staggered by --i (a third of the small duration per step). */
html.js .rv .reveal {
  opacity: 0;
  translate: 0 var(--space-s);
  transition: opacity var(--motion-large-duration) var(--motion-large-easing),
    translate var(--motion-large-duration) var(--motion-large-easing);
  transition-delay: calc(var(--i, 0) * var(--motion-duration) / 3);
}
html.js .rv.visible .reveal { opacity: 1; translate: none; }
/* One fill per list that glides to the active row; its bottom edge fills as the clip or state plays. */
.has-glide { position: relative; }
.has-glide > .prompt, .has-glide > .state { position: relative; z-index: 1; }
.has-glide > .prompt[aria-pressed="true"], .has-glide > .state[aria-pressed="true"] { background: transparent; }
.glide {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  overflow: hidden;
  background: var(--well);
  pointer-events: none;
  transition: transform var(--motion-large-duration) var(--motion-large-easing),
    width var(--motion-large-duration) var(--motion-large-easing),
    height var(--motion-large-duration) var(--motion-large-easing);
}
.try-list .glide { border-radius: var(--radius-m); }
.glide-bar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--color-1);
  transform: scaleX(0);
  transform-origin: left;
}
/* Between clips the recording fades out, the next one loads, and it fades back in. */
.try-phone video.is-swapping { opacity: 0; }

body {
  background: var(--neutral-1);
  color: var(--neutral-10);
  font: var(--weight-ui-regular) var(--size-s) / var(--line-s) var(--font-ui);
  letter-spacing: var(--letter-spacing-s);
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--motion-large-duration) var(--motion-large-easing),
    color var(--motion-large-duration) var(--motion-large-easing);
}

::selection { background: var(--neutral-10); color: var(--neutral-1); }

a { color: inherit; text-decoration: none; }

/* Underline that grows from the left (résumé). */
a.u {
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% var(--border-s);
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size var(--motion-large-duration) var(--motion-large-easing);
  padding-bottom: 1px;
}
a.u:hover, a.u:focus-visible { background-size: 100% var(--border-s); }
a.u.on { background-size: 100% var(--border-s); }
a.u.on:hover { background-size: 0% var(--border-s); }

/* Ink focus outline, not DG gold: gold on white is 2.3:1 */
:focus-visible { outline: 2px solid var(--neutral-10); outline-offset: 2px; border-radius: var(--radius-xs); }

.wrap {
  max-width: 72rem;
  margin: 0 auto;
  padding: var(--space-xxl) var(--gut);
}

/* ── Type roles ──────────────────────────── */
.meta {
  font: var(--weight-ui-medium) var(--size-xs) / var(--line-xs) var(--font-ui);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
h1 {
  font: var(--weight-brand-medium) var(--size-display) / var(--line-display) var(--font-brand);
  letter-spacing: var(--letter-spacing-xxl);
  margin: var(--space-xs) 0 var(--space-l);
}
.lede {
  font: var(--weight-editorial-regular) var(--size-l) / var(--line-l) var(--font-editorial);
  letter-spacing: var(--letter-spacing-l);
  color: var(--neutral-10);
}
.body {
  font: var(--weight-editorial-regular) var(--size-m) / var(--line-m) var(--font-editorial);
  letter-spacing: var(--letter-spacing-m);
  color: var(--neutral-8);
  max-width: 62ch;
}
.lede + .body { margin-top: var(--space-m); }
.body.single { max-width: 58ch; }

/* ── Hero ────────────────────────────────── */
.hero { padding-top: var(--space-m); }
.hero-text { max-width: 46rem; margin-top: var(--space-xxl); }
.crew ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-m);
}
.crew li { display: grid; align-content: start; justify-items: center; text-align: center; }
/* Box's canvas keeps empty rows under its floor shadow (room to hop); pull the word up into them. */
.crew li span { margin-top: -18%; }
.crew .box-canvas { width: 100%; max-width: 9rem; aspect-ratio: 4 / 5; }
.crew span {
  font: var(--weight-ui-medium) var(--size-xs) / var(--line-xs) var(--font-ui);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-8);
}
.crew .red span { color: var(--error); }
/* Box is the focus target; the ring hugs the canvas. */
.crew .box-canvas:focus-visible { border-radius: var(--radius-m); }
.box-canvas { display: block; }
.facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-s) var(--space-l);
  margin-top: var(--space-xxl);
}
.facts dt {
  font: var(--weight-data-medium) var(--size-xs) / var(--line-xs) var(--font-data);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
.facts dd { color: var(--neutral-10); }

/* ── Sections ────────────────────────────── */
section { margin-top: var(--section-gap); }

.shead {
  display: flex; align-items: baseline; gap: var(--space-s);
  margin-bottom: var(--space-l);
}
.shead h2 {
  font: var(--weight-editorial-regular) var(--size-xl) / var(--line-xl) var(--font-editorial);
  letter-spacing: var(--letter-spacing-xl);
  color: var(--neutral-10);
}


/* ── Phone screens ───────────────────────── */
.phone {
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: var(--neutral-2);
  box-shadow: var(--edge), var(--shadow-m);
}
.phone img, .phone video {
  display: block;
  width: 100%;
  height: auto;
}

.shots {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-xl);
  /* Phone rows get room above and below, so they read as their own block. */
  margin-block: var(--space-xxl) var(--space-xl);
}
.shots figure { max-width: var(--phone-w); justify-self: center; width: 100%; }
/* Two phones sit centered in the content, not against its left edge. */
.shots-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: calc(2 * var(--phone-w) + var(--space-xl));
  margin-inline: auto;
}
figcaption {
  margin-top: var(--space-s);
  font: var(--weight-ui-regular) var(--size-xs) / var(--line-xs) var(--font-ui);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
figcaption b {
  display: block;
  margin-bottom: var(--space-xxs);
  font: var(--weight-ui-medium) var(--size-s) / var(--line-s) var(--font-ui);
  letter-spacing: var(--letter-spacing-s);
  color: var(--neutral-10);
}

/* ── Ask it something ────────────────────── */
.try {
  max-width: 48rem;
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--phone-w);
  gap: var(--space-xxl);
  align-items: start;
}
.try-list { display: grid; gap: var(--space-xs); }
.prompt {
  display: grid;
  grid-template-columns: var(--space-l) minmax(0, 1fr);
  gap: var(--space-xxs) 0;
  width: 100%;
  padding: var(--space-m);
  border: 0;
  border-radius: var(--radius-m);
  background: transparent;
  box-shadow: none;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--motion-duration) var(--motion-easing),
    box-shadow var(--motion-duration) var(--motion-easing);
}
.prompt:hover .q { text-decoration: underline; text-decoration-thickness: var(--border-s); text-underline-offset: var(--border-l); }
.prompt:active { translate: 0 var(--motion-press-distance); }
.prompt[aria-pressed="true"] { background: var(--well); }
.prompt .icon { grid-row: 1; display: grid; place-items: center start; height: var(--line-m); color: var(--neutral-10); }
.prompt .q, .prompt .why { grid-column: 2; }
.prompt .icon svg { display: none; }
/* Only the active prompt shows an icon: play while the recording runs, pause while it's stopped. */
.try[data-playing="true"] .prompt[aria-pressed="true"] .i-play,
.try[data-playing="false"] .prompt[aria-pressed="true"] .i-pause { display: block; }
.prompt[aria-pressed="false"] .why { color: var(--neutral-7); }
.prompt .q {
  font: var(--weight-editorial-medium) var(--size-m) / var(--line-m) var(--font-editorial);
  letter-spacing: var(--letter-spacing-m);
  color: var(--neutral-10);
}
.prompt .why { color: var(--neutral-8); }
.try-phone { position: sticky; top: calc(var(--header-h) + var(--space-l)); }
.try-toggle {
  display: block;
  margin: var(--space-s) auto 0;
  padding: var(--space-xs) var(--space-m);
  border: 0;
  border-radius: var(--radius-full);
  background: transparent;
  box-shadow: var(--outline);
  color: var(--neutral-10);
  font: var(--weight-ui-medium) var(--size-xs) / var(--line-xs) var(--font-ui);
  letter-spacing: var(--letter-spacing-xs);
  cursor: pointer;
  transition: background-color var(--motion-duration) var(--motion-easing);
}
.try-toggle:hover { background: var(--neutral-3); }
.try-phone video { cursor: pointer; aspect-ratio: var(--clip-ratio, 600 / 1304); object-fit: cover; transition: opacity var(--motion-duration) var(--motion-easing); }

/* ── States picker ─────────────────────── */
.picker {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: var(--space-xl);
  align-items: center;
  margin-top: var(--space-xl);
}
.picker-stage .box-canvas { width: 100%; aspect-ratio: 4 / 5; }
.picker-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--border-s);
  overflow: hidden;
}
.state {
  display: grid;
  grid-template-columns: var(--space-l) minmax(0, 1fr);
  align-content: start;
  gap: var(--space-xxs) 0;
  padding: var(--space-s) var(--space-m);
  border: 0;
  background: transparent;
  box-shadow: var(--cell-ring);
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  text-align: left;
  cursor: pointer;
}
.state b {
  font: var(--weight-ui-medium) var(--size-s) / var(--line-s) var(--font-ui);
  letter-spacing: var(--letter-spacing-s);
  color: var(--neutral-8);
}
.state span {
  font: var(--weight-ui-regular) var(--size-xs) / var(--line-xs) var(--font-ui);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
.state:hover b, .state[aria-pressed="true"] b { color: var(--neutral-10); }
.state[aria-pressed="true"] { background: var(--well); }
.state .icon { grid-row: 1; display: grid; place-items: center start; height: var(--line-s); color: var(--neutral-10); }
.state b, .state span:not(.icon) { grid-column: 2; }
.state .icon svg { display: none; }
/* As in "Ask it something": only the active state shows an icon, play while the loop runs, pause while it's held. */
.picker[data-playing="true"] .state[aria-pressed="true"] .i-play,
.picker[data-playing="false"] .state[aria-pressed="true"] .i-pause { display: block; }
.state.red b { color: var(--error); }
.state:focus-visible { outline-offset: calc(-1 * var(--space-xxs)); }

/* ── Permissions ─────────────────────────── */
.tiers, .catches, .points {
  list-style: none;
  display: grid;
  gap: var(--border-s);
  overflow: hidden;
  margin-top: var(--space-xl);
}
.tiers { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.tiers li, .catches li, .points li {
  display: grid;
  align-content: start;
  gap: var(--space-xxs);
  padding: var(--space-m) var(--space-l) var(--space-m) 0;
  box-shadow: var(--cell-ring);
}
.tiers li + li, .catches li:not(:nth-child(3n + 1)), .points li:not(:nth-child(3n + 1)) { padding-left: var(--space-l); }
.tiers .t {
  justify-self: start;
  margin-bottom: var(--space-xs);
  padding: var(--space-xxs) var(--space-xs);
  border-radius: var(--radius-xs);
  box-shadow: var(--outline);
  font: var(--weight-data-medium) var(--size-xs) / var(--line-xs) var(--font-data);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-10);
}
.tiers b {
  font: var(--weight-editorial-medium) var(--size-m) / var(--line-m) var(--font-editorial);
  letter-spacing: var(--letter-spacing-m);
}
.tiers em {
  font: var(--weight-ui-medium) var(--size-s) / var(--line-s) var(--font-ui);
  font-style: normal;
  letter-spacing: var(--letter-spacing-s);
  color: var(--neutral-10);
}
.tiers span { color: var(--neutral-7); }
.catches b {
  font: var(--weight-brand-medium) var(--size-xl) / var(--line-xl) var(--font-brand);
  letter-spacing: var(--letter-spacing-xl);
}
.catches span { color: var(--neutral-8); }

/* ── The vault ───────────────────────────── */
.flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-l);
  align-items: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  box-shadow: inset 0 var(--border-s) 0 var(--divider);
}
.flow-col h3, .sub {
  margin-bottom: var(--space-s);
  font: var(--weight-data-medium) var(--size-xs) / var(--line-xs) var(--font-data);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
.flow-col ul { list-style: none; }
.flow-col li { padding: var(--space-xs) 0; box-shadow: inset 0 calc(-1 * var(--border-s)) 0 var(--divider); color: var(--neutral-8); }
.flow-core { display: grid; gap: var(--space-s); }
.vault {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-s);
  padding: var(--space-m);
  border-radius: var(--radius-m);
  box-shadow: var(--outline);
}
.vault b {
  font: var(--weight-editorial-medium) var(--size-m) / var(--line-m) var(--font-editorial);
  letter-spacing: var(--letter-spacing-m);
}
.vault span, .flow-core p {
  font: var(--weight-ui-regular) var(--size-xs) / var(--line-xs) var(--font-ui);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-8);
}
.points { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: var(--space-xxl); }
.points h3 {
  margin-bottom: var(--space-xxs);
  font: var(--weight-editorial-medium) var(--size-m) / var(--line-m) var(--font-editorial);
  letter-spacing: var(--letter-spacing-m);
}
.points p { color: var(--neutral-8); }
/* How I built it: the six chapters as a grid, then the changelog under them. */
.chapters .d {
  font: var(--weight-data-medium) var(--size-xs) / var(--line-xs) var(--font-data);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
.sub.log-head { margin-top: var(--space-xxl); margin-bottom: var(--space-xs); }

/* ── Money ───────────────────────────────── */
.sub { margin-top: var(--space-xl); }
.catches { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 0; }

/* ── Health ──────────────────────────────── */
/* Like "Ask it something", the Health pair sits tight in the middle rather than across the page. */
.split {
  max-width: 48rem;
  margin-inline: auto;
  display: grid;
  grid-template-columns: var(--phone-w) minmax(0, 1fr);
  gap: var(--space-xxl);
  align-items: center;
}
.split .body { margin-bottom: var(--space-l); }
.rules {
  list-style: none;
  counter-reset: rule;
  display: grid;
  box-shadow: inset 0 var(--border-s) 0 var(--divider);
}
.rules li {
  counter-increment: rule;
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  padding: var(--space-s) 0;
  box-shadow: inset 0 calc(-1 * var(--border-s)) 0 var(--divider);
  color: var(--neutral-10);
}
.rules li::before {
  content: counter(rule);
  font: var(--weight-data-medium) var(--size-xs) / var(--line-s) var(--font-data);
  color: var(--neutral-7);
}

/* ── Changelog dividers ───────────────────── */
.log > li + li { box-shadow: inset 0 var(--border-s) 0 var(--neutral-4); }

/* ── Changelog ───────────────────────────── */
.log { list-style: none; margin-top: var(--space-l); }
.log > li {
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  gap: 0 var(--space-l);
  padding: var(--space-l) 0;
}
.log-when { display: grid; align-content: start; gap: var(--space-xxs); }
.log-when time {
  font: var(--weight-data-medium) var(--size-s) / var(--line-s) var(--font-data);
  letter-spacing: var(--letter-spacing-s);
  color: var(--neutral-10);
}
.log-when span {
  font: var(--weight-data-regular) var(--size-xs) / var(--line-xs) var(--font-data);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
.log-body h3 {
  margin-bottom: var(--space-xs);
  font: var(--weight-editorial-medium) var(--size-m) / var(--line-m) var(--font-editorial);
  letter-spacing: var(--letter-spacing-m);
}
.log-body ul { list-style: none; display: grid; gap: var(--space-xxs); }
.log-body li, .log p { position: relative; padding-left: var(--space-s); color: var(--neutral-8); max-width: 68ch; }
.log-body li::before {
  content: ""; position: absolute; left: 0;
  top: calc((var(--line-s) - var(--space-xxs)) / 2);
  width: var(--space-xxs); height: var(--space-xxs);
  border-radius: var(--radius-full); background: var(--color-1);
}
.log p { padding-left: 0; }
.log .ref {
  white-space: nowrap;
  font: var(--weight-data-regular) var(--size-xs) / var(--line-xs) var(--font-data);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
/* ── What's next ─────────────────────────── */
.links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s) var(--space-l);
  margin-top: var(--space-l);
  font: var(--weight-ui-medium) var(--size-s) / var(--line-s) var(--font-ui);
  letter-spacing: var(--letter-spacing-s);
}

.foot {
  max-width: 72rem;
  margin: var(--space-xxl) auto 0;
  padding: var(--space-l) var(--gut) var(--space-xxl);
  font: var(--weight-ui-regular) var(--size-xs) / var(--line-xs) var(--font-ui);
  letter-spacing: var(--letter-spacing-xs);
  color: var(--neutral-7);
}
.foot p { padding-top: var(--space-m); box-shadow: inset 0 var(--border-s) 0 var(--neutral-4); }

/* ── Narrower screens ────────────────────── */
@media (max-width: 960px) {
  .flow { grid-template-columns: minmax(0, 1fr); }
  .points { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .points li:not(:nth-child(3n + 1)) { padding-left: 0; }
  .points li:nth-child(2n) { padding-left: var(--space-l); }
  .tiers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiers li + li { padding-left: 0; }
  .tiers li:nth-child(2n) { padding-left: var(--space-l); }
}
@media (max-width: 760px) {
  :root { --section-gap: var(--space-xxl); }
  .points { grid-template-columns: minmax(0, 1fr); }
  .points li, .points li:nth-child(2n) { padding-left: 0; }
  .catches { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .catches b {
    font-size: var(--size-l);
    line-height: var(--line-l);
    letter-spacing: var(--letter-spacing-l);
  }
  .catches li:not(:nth-child(3n + 1)) { padding-left: 0; }
  .catches li:nth-child(2n) { padding-left: var(--space-l); }
  .split, .picker { grid-template-columns: minmax(0, 1fr); gap: var(--space-l); }
  .split-shot { width: min(var(--phone-w), 75vw); justify-self: center; }
  /* The list runs five rows deep: Box stays pinned under the header while a state is picked. */
  .picker-stage {
    position: sticky;
    top: var(--header-h);
    z-index: 1;
    justify-self: stretch;
    background: var(--neutral-1);
  }
  .picker-stage .box-canvas { width: min(9rem, 40vw); margin-inline: auto; }
  .try { grid-template-columns: minmax(0, 1fr); gap: var(--space-l); }
  .try-phone { position: static; order: -1; width: min(var(--phone-w), 75vw); justify-self: center; }
  .log > li { grid-template-columns: minmax(0, 1fr); gap: var(--space-xs); }
  .log-when { grid-auto-flow: column; justify-content: start; align-items: baseline; gap: var(--space-s); }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .crew ul { gap: var(--space-m) var(--space-xs); }
  .crew span {
    font-size: var(--size-xxs);
    line-height: var(--line-xxs);
    letter-spacing: var(--letter-spacing-xxs);
  }
  .shead h2 {
    font-size: var(--size-l);
    line-height: var(--line-l);
    letter-spacing: var(--letter-spacing-l);
  }
  /* Three phones side by side would be too small: they scroll sideways inside the page instead. */
  .shots, .shots-2 {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: min(70vw, var(--phone-w));
    gap: var(--space-m);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: var(--gut);
    margin-inline: calc(-1 * var(--gut));
    padding: 0 var(--gut) var(--space-s);
    max-width: none;
    scrollbar-width: none;
  }
  .shots::-webkit-scrollbar { display: none; }
  .shots figure { scroll-snap-align: start; }
}