/* The look of the race-multiview demo.
 *
 * The aesthetic is the one this project settled on in phase 04 and it is stated as what it
 * rules out rather than what it adds: one idea per screen, in full-height sections; a lot of
 * air; two or three type sizes and no more; a short and almost entirely neutral palette, WITH
 * THE COLOUR COMING FROM THE VIDEO AND NOT FROM THE PAGE; no ornamental gradients and no
 * dramatic shadows; restrained motion. The video is the product: it goes first, big, and
 * without a frame.
 *
 * NOT ONE COLOUR IS ADDED HERE. The tokens below are the ones `demo/multiview-offer/` already
 * uses, values and names, and the six liveries of the race are in the picture and nowhere in
 * this file: a page that painted itself in the colours of the cars would be competing with
 * the thing it is showing.
 *
 * NOTHING HERE STYLES THE COMPOSITION AND NOTHING HERE STYLES THE CONTROLS. The boxes of a
 * multi view, the selector, the bar and the buttons on each box are drawn and styled by the
 * library inside the container this page hands it, because how that layer stacks is an
 * invariant of the renderer and not a choice of whoever writes a page. The one value this page
 * hands the chrome is `--qa-accent`, which is somebody's brand colour and never a constant of
 * the library. */

:root {
  --q-teal-500: #37b4a7;
  --q-teal-200: #c2e0de;
  --q-ink-900: #12141a;
  --q-ink-700: #1a1e27;
  --q-slate-400: #7f8aa3;
  --q-paper-50: #f8f9fa;
  --q-rule: #2a303d;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--q-ink-900);
  color: var(--q-paper-50);
  font-family: 'Poppins', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

code, pre, .tag, .mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }

a { color: var(--q-teal-200); }

/* THE MARK, at the top and at the foot, and nowhere over the picture. The file is the brand
 * logo with its wordmark in white, because the original is ink on a light surface and half of
 * it would disappear here. */
.masthead { display: grid; place-items: center; padding: 26px 20px 10px; }
.brand { width: clamp(120px, 14vw, 168px); height: auto; display: block; }
.brand--foot { margin: 0 auto 34px; opacity: 0.75; }

/* ---------------------------------------------------------------------------
 * THE OPENING.
 *
 * A tall section with a sticky panel inside it: the panel holds still while the section
 * scrolls past, which is what makes it read as pinned, and when the section runs out the panel
 * lets go and the picture comes up from underneath. Nothing animates on a timer. The only
 * input is `--t`, the fraction of the section already scrolled, written once per frame by
 * `js/opening.js`.
 *
 * TWO NUMBERS COME OUT OF `--t` AND THE REST IS DERIVED FROM THEM.
 *
 * `--s` is the shrink, and it finishes exactly when the first sentence hands over to the
 * second: the type is nearly the whole screen at the start and has settled into its reading
 * size by the time there is a second thing to read. It is written against `--n`, the number of
 * sentences, so adding one does not leave the resizing bleeding into it.
 *
 * `--u` places each sentence in its own stretch of the scroll: 0 where it takes over, 1 where
 * the next one does. The two ends cross-fade over the same fifteen hundredths, so the
 * opacities always add to one and there is never a moment with nothing on screen nor one with
 * two sentences on top of each other. The first line is lit at `--u = 0` rather than on the way
 * in, so the page opens with the sentence already there.
 *
 * The last one does not go out: `--salida` turns its exit term off, so it holds until the
 * picture scrolls over it instead of leaving a dead black stretch.
 * ------------------------------------------------------------------------- */
.opening {
  --t: 0;
  /* Written by `js/opening.js` with the real count. This value exists only so the property is
   * valid before the script runs, and at that instant there is nothing to divide: it is a
   * floor and not a copy of the data. */
  --n: 1;
  --s: min(1, calc(var(--t) * var(--n)));
  height: 300vh;
  background: #000;
}

.opening__panel {
  position: sticky;
  top: 0;
  height: 100vh;
  display: grid;
  place-items: center;
  padding: 0 clamp(20px, 6vw, 110px);
  background: #000;
}

.opening__line {
  --u: calc(var(--t) * var(--n) - var(--i));
  --salida: 1;
  grid-area: 1 / 1;
  margin: 0;
  /* It widens as it shrinks, and that is why it is two numbers and not one: `ch` scales with
   * the body, so a fixed width in `ch` that breaks the huge sentence into two lines breaks the
   * small one into three. */
  max-width: calc(18ch + 8ch * var(--s));
  text-align: center;
  text-wrap: balance;
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-size: calc(clamp(40px, 14vw, 140px)
    + (clamp(23px, 3.2vw, 44px) - clamp(40px, 14vw, 140px)) * var(--s));
  opacity: calc(
    clamp(0, calc((var(--u) + 0.15) / 0.15), 1)
    - clamp(0, calc((var(--u) - 0.85) / 0.15), 1) * var(--salida));
}

/* THE LAST SENTENCE NAMES THE THING and therefore weighs differently: the ones before it build
 * the question and none of them says the word. So it goes back up in size instead of staying at
 * reading size, and it does not fade -- the race arrives over the name rather than over an
 * empty screen. */
.opening__line:last-child {
  --salida: 0;
  font-size: clamp(29px, 6vw, 80px);
  color: var(--q-teal-200);
}

/* With reduced motion the type does not resize: it stays at the small size and the sentences
 * still pass with the scroll, which is the part that is reading and not movement. */
@media (prefers-reduced-motion: reduce) {
  .opening { --s: 1; }
}

/* ---------------------------------------------------------------------------
 * THE PLAYER AND WHAT IS UNDER IT.
 * ------------------------------------------------------------------------- */
.stage {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(18px, 4vw, 46px) clamp(14px, 3vw, 28px) clamp(40px, 8vw, 96px);
}

.frame { position: relative; }

/* The box the composition lives in, and the only thing this page hands the library besides the
 * instance.
 *
 * `isolation: isolate` is not decoration: the chrome the library draws sits at
 * z-index 2147483000, and without a stacking context of its own that number would escape the
 * container and draw over anything on the page. */
.player {
  position: relative;
  isolation: isolate;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  --qa-accent: var(--q-teal-500);
}

.player .video { width: 100%; height: 100%; display: block; }

/* THE STATE LINE. Monospace, because two of the three things it reports are numbers that change
 * several times a second and proportional type makes them jitter. */
.state {
  margin: 14px 0 0;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: clamp(11px, 1.15vw, 13px);
  line-height: 1.6;
  color: var(--q-teal-200);
  word-break: break-word;
}

.hud { margin: 6px 0 0; font-size: 12px; color: var(--q-slate-400); }

/* ---------------------------------------------------------------------------
 * THE SECTIONS BELOW: one idea per screen.
 * ------------------------------------------------------------------------- */
.chapter {
  min-height: 100vh;
  display: grid;
  align-content: center;
  padding: clamp(56px, 9vw, 110px) clamp(16px, 4vw, 40px);
  border-top: 1px solid var(--q-rule);
}

/* The credits are the foot and not a third idea (ADR 0077): shorter than a screen, and
 * distributing instead of centring is what lets the mark sit AT the bottom rather than wherever
 * the text happens to end. */
.chapter--end { min-height: 66vh; align-content: space-between; }

.chapter__inner { max-width: 1000px; margin: 0 auto; width: 100%; }

.kicker {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--q-teal-500);
}

.chapter h2 {
  margin: 0 0 20px;
  font-size: clamp(25px, 3.6vw, 44px);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 22ch;
  text-wrap: balance;
}

.lede {
  margin: 0 0 30px;
  max-width: 66ch;
  font-size: clamp(14px, 1.5vw, 17px);
  line-height: 1.7;
  color: #c8d0dd;
}

.note {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--q-slate-400);
}

.chapter code { font-size: 0.9em; color: var(--q-teal-200); }

/* ---------------------------------------------------------------------------
 * SECTION 1: the window, one row, lit while it is open.
 *
 * A grid of three columns on a wide screen and a stack on a narrow one: the time and the class
 * are labels and the copy is the body, so they read as a row when there is room and as a block
 * when there is not.
 * ------------------------------------------------------------------------- */
.run {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--q-rule);
}

.run__row {
  display: grid;
  grid-template-columns: 150px 120px 1fr;
  gap: 4px 18px;
  padding: 16px 12px;
  border-bottom: 1px solid var(--q-rule);
  color: var(--q-slate-400);
  transition: background 180ms ease, color 180ms ease;
}

.run__row--past { opacity: 0.55; }

.run__row--open {
  background: rgba(55, 180, 167, 0.08);
  color: var(--q-paper-50);
  box-shadow: inset 2px 0 0 var(--q-teal-500);
}

.run__when {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12.5px;
  white-space: nowrap;
}

.run__kind {
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--q-teal-200);
}

.run__what { font-size: 13.5px; line-height: 1.65; }
.run__what p { margin: 0; }
.run__more { margin-top: 8px !important; color: var(--q-teal-200); }

/* THE CAMERAS, BY NAME. They are pills and not a bulleted list because that is what they are on
 * screen: a row of the selector, read by the driver on it. */
.run__names {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.run__names li {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11.5px;
  padding: 3px 9px;
  border: 1px solid var(--q-rule);
  border-radius: 999px;
  color: var(--q-paper-50);
}

@media (max-width: 720px) {
  .run__row { grid-template-columns: 1fr; gap: 6px; }
}

/* ---------------------------------------------------------------------------
 * SECTION 2: the tag, the gloss and the fold.
 * ------------------------------------------------------------------------- */
.code {
  margin: 0;
  padding: 16px 18px;
  border: 1px solid var(--q-rule);
  border-radius: 10px;
  background: #05070b;
  font-size: 11.5px;
  line-height: 1.7;
  color: #c8d0dd;
  overflow-x: auto;
  white-space: pre;
}

/* A Date Range is one very long line. Printed as one it either overflows or is scrolled
 * sideways to be read, so each attribute goes on its own line with the tag name hanging above:
 * the same characters, in a shape a reader can scan. */
#tags { white-space: normal; }

.tag { margin: 0 0 14px; }
.tag:last-child { margin-bottom: 0; }

.tag__name { display: block; color: var(--q-teal-500); }

.tag__attr {
  display: block;
  padding-left: 2ch;
  color: #c8d0dd;
  word-break: break-all;
}

.payload { margin: 26px 0 0; }

.payload__lede {
  margin: 0 0 18px;
  max-width: 66ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: #c8d0dd;
}

.payload__level {
  padding: 16px 18px;
  margin-bottom: 12px;
  border: 1px solid var(--q-rule);
  border-radius: 10px;
  background: var(--q-ink-700);
}

.payload__level h3 {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--q-teal-500);
}

.payload__level dl { margin: 0; font-size: 12.5px; }

.payload__level dt {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  margin-top: 10px;
}

.payload__level dt:first-child { margin-top: 0; }
.payload__level dd { margin: 2px 0 0; color: var(--q-slate-400); line-height: 1.6; }

.assets { margin: 22px 0 0; }

.asset {
  border: 1px solid var(--q-rule);
  border-radius: 10px;
  background: var(--q-ink-700);
  margin-bottom: 10px;
}

.asset summary {
  cursor: pointer;
  padding: 13px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12.5px;
}

.asset__url { color: var(--q-slate-400); font-size: 11px; word-break: break-all; }

/* The fold whose window is open right now. It is hidden rather than absent when it is not, so
 * the row does not change width the instant the window opens. */
.asset__live {
  margin-left: auto;
  visibility: hidden;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--q-ink-900);
  background: var(--q-teal-500);
  border-radius: 999px;
  padding: 2px 9px;
}

.asset--live { border-color: var(--q-teal-500); }
.asset--live .asset__live { visibility: visible; }

.asset .code { border: 0; border-top: 1px solid var(--q-rule); border-radius: 0 0 10px 10px; }

/* ---------------------------------------------------------------------------
 * THE FOOT.
 * ------------------------------------------------------------------------- */
.credit {
  margin: 0;
  max-width: 72ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--q-slate-400);
}

.credit em { color: #c8d0dd; font-style: italic; }
.credit strong { color: #c8d0dd; font-weight: 600; }