/*
 * Photonic Zero demo.
 *
 * Monochrome by instruction: one hue (250, a cool ink), and every surface,
 * rule and state is a tint or shade of it. No second colour anywhere in the
 * chrome. The only saturated colour on the whole site is the transmitted frame
 * itself, which is data rather than decoration and only appears once a
 * transfer is running.
 *
 * Light, not dark. The earlier dark build justified itself on camera exposure,
 * but that only ever applied to the transmitting surface, which is the
 * fullscreen beam. It covers the page completely, so the reading theme has no
 * bearing on decoding at all.
 */

:root {
  color-scheme: light;

  --h: 250;

  --paper:     oklch(0.985 0.003 var(--h));
  --paper-sunk:oklch(0.962 0.005 var(--h));
  --rule:      oklch(0.885 0.008 var(--h));
  --rule-firm: oklch(0.78 0.012 var(--h));
  --ink:       oklch(0.24 0.028 var(--h));
  --ink-mid:   oklch(0.48 0.022 var(--h));
  --ink-soft:  oklch(0.62 0.016 var(--h));

  --display: "Anybody", ui-sans-serif, system-ui, sans-serif;
  --body:    "Archivo", ui-sans-serif, system-ui, sans-serif;
  --mono:    "Martian Mono", ui-monospace, monospace;

  --s-2: 0.5rem;
  --s-1: 0.75rem;
  --s0:  1rem;
  --s1:  1.5rem;
  --s2:  2rem;
  --s3:  3rem;
  --s4:  4.5rem;
  --s5:  7rem;

  --measure: 58ch;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Any class here that sets `display` outranks the user agent's [hidden] rule,
   so a hidden panel would render anyway. This restores the attribute's meaning
   once, rather than remembering to guard every component that uses grid. */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: clamp(1rem, 0.96rem + 0.18vw, 1.0625rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: fixed; top: var(--s-2); left: var(--s-2); z-index: 100;
  padding: var(--s-2) var(--s0);
  background: var(--ink); color: var(--paper);
  font-family: var(--mono); font-size: 0.75rem; text-decoration: none;
  transform: translateY(-200%);
}
.skip:focus { transform: none; }

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

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

.masthead {
  position: sticky; top: 0; z-index: 20;
  display: flex; justify-content: space-between; align-items: baseline;
  padding: var(--s0) clamp(var(--s0), 5vw, var(--s4));
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  font-family: var(--display);
  font-variation-settings: "wdth" 118, "wght" 800;
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.masthead-meta { font-family: var(--mono); font-size: 0.625rem; color: var(--ink-soft); }

/* ---------------------------------------------------------------- beats --- */

main {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 clamp(var(--s0), 5vw, var(--s4));
}

.beat {
  padding-block: var(--s5);
  border-bottom: 1px solid var(--rule);
}
.beat:last-of-type { border-bottom: none; }

.beat-hero { padding-top: var(--s4); border-bottom: none; }

h1 {
  font-family: var(--display);
  font-variation-settings: "wdth" 100, "wght" 700;
  font-size: clamp(2.5rem, 1.4rem + 4.6vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0 0 var(--s1);
  max-width: 16ch;
  text-wrap: balance;
}

h2 {
  font-family: var(--display);
  font-variation-settings: "wdth" 100, "wght" 700;
  font-size: clamp(1.5rem, 1.15rem + 1.5vw, 2.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 var(--s0);
  max-width: 20ch;
  text-wrap: balance;
}

h3 {
  font-family: var(--display);
  font-variation-settings: "wdth" 100, "wght" 700;
  font-size: 1.0625rem;
  margin: 0;
}

p { margin: 0; max-width: var(--measure); }
.beat p + p { margin-top: var(--s0); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: var(--s1);
}

.lede { font-size: 1.1875rem; line-height: 1.55; color: var(--ink-mid); max-width: 46ch; }
.aside { color: var(--ink-soft); font-size: 0.9375rem; }
em { font-style: italic; }
code { font-family: var(--mono); font-size: 0.85em; }

.scroll-cue { display: none; }

/* -------------------------------------------------------------- readout --- */

.readout, .progress {
  font-family: var(--mono);
  font-size: 0.75rem;
  max-width: 30rem;
  margin-top: var(--s1);
  display: grid; gap: 0;
}

.readout-row, .progress-head {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: var(--s0);
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  padding-block: var(--s-2);
}
.readout-row b, .progress-head b {
  color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums;
}

.meter { height: 2px; background: var(--rule); overflow: hidden; margin-top: var(--s-1); }
.meter > i {
  display: block; height: 100%; width: 0%;
  background: var(--ink-mid);
  transition: width 240ms linear;
}
.meter > i.is-locked { background: var(--ink); }

/* -------------------------------------------------------------- numbers --- */

.numbers {
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.75rem;
  margin-top: var(--s1);
  width: 100%;
  max-width: 42rem;
}
.numbers th {
  text-align: left; font-weight: 400; color: var(--ink-soft);
  text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.5625rem;
  padding-bottom: var(--s-2);
  border-bottom: 1px solid var(--rule-firm);
}
.numbers td { padding: var(--s-2) var(--s1) var(--s-2) 0; color: var(--ink-mid); }
.numbers tbody tr + tr td { border-top: 1px solid var(--rule); }
.numbers .is-pick td { color: var(--ink); font-weight: 600; }

/* --------------------------------------------------------------- panels --- */

.panels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
  gap: var(--s2);
  margin-top: var(--s2);
}

.panel {
  border: 1px solid var(--rule-firm);
  padding: var(--s1);
  display: grid;
  gap: var(--s1);
  align-content: start;
  background: var(--paper);
}
.panel > header { display: grid; gap: 2px; }
.panel > header p { font-size: 0.875rem; color: var(--ink-soft); margin: 0; }

.drop {
  display: grid; place-items: center; gap: 2px;
  padding: var(--s2) var(--s0);
  border: 1px dashed var(--rule-firm);
  cursor: pointer;
  text-align: center;
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}
.drop:hover, .drop.is-over { border-color: var(--ink); background: var(--paper-sunk); }
.drop-primary { font-weight: 600; }
.drop-secondary { font-family: var(--mono); font-size: 0.625rem; color: var(--ink-soft); }

.field { display: grid; gap: var(--s-2); }
.field label {
  font-family: var(--mono); font-size: 0.5625rem;
  text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-soft);
}
select {
  font-family: var(--mono); font-size: 0.75rem;
  background: var(--paper); color: var(--ink);
  border: 1px solid var(--rule-firm);
  padding: var(--s-2) var(--s-1);
  width: 100%;
}

.ink-row { display: flex; align-items: center; gap: var(--s-1); }
.ink-row input[type="color"] {
  inline-size: 2.75rem; block-size: 2rem;
  padding: 2px;
  border: 1px solid var(--rule-firm);
  background: var(--paper);
  cursor: pointer;
}
.ink-row output {
  font-family: var(--mono); font-size: 0.625rem; color: var(--ink-soft);
}
.ink-row output.is-bad { color: var(--ink); font-weight: 600; }

.plan { display: grid; gap: 0; margin: 0; font-family: var(--mono); font-size: 0.75rem; }
.plan > div {
  display: flex; justify-content: space-between; gap: var(--s0);
  border-bottom: 1px solid var(--rule); padding-block: var(--s-2);
}
.plan dt { color: var(--ink-soft); }
.plan dd { margin: 0; font-variant-numeric: tabular-nums; }

button, .primary { font: inherit; }

.primary {
  display: block; width: 100%; text-align: center; text-decoration: none;
  padding: var(--s-1) var(--s0);
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  font-weight: 600;
  cursor: pointer;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}
.primary:hover:not(:disabled) { background: var(--paper); color: var(--ink); }
.primary:disabled { background: var(--paper-sunk); color: var(--ink-soft); border-color: var(--rule); cursor: not-allowed; }

.ghost {
  display: block; width: 100%; text-align: center;
  padding: var(--s-2) var(--s0);
  background: none; color: var(--ink-mid);
  border: 1px solid var(--rule-firm);
  cursor: pointer;
  font-size: 0.875rem;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.ghost:hover { color: var(--ink); border-color: var(--ink); }

.note {
  font-family: var(--mono); font-size: 0.5625rem; line-height: 1.7;
  color: var(--ink-soft); text-align: center; max-width: none;
  text-wrap: balance;
}

/* ------------------------------------------------------------- viewport --- */

.viewport {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--paper-sunk);
  border: 1px solid var(--rule-firm);
  overflow: hidden;
  display: grid;
}
.viewport > video { width: 100%; height: 100%; object-fit: cover; grid-area: 1/1; }
.viewport-empty {
  grid-area: 1/1; display: grid; place-items: center;
  font-family: var(--mono); font-size: 0.625rem; color: var(--ink-soft);
}
.reticle {
  grid-area: 1/1; margin: 12%;
  border: 1px solid oklch(0.24 0.028 250 / 0.25);
  pointer-events: none;
}
.viewport.is-locked .reticle { border-color: var(--ink); border-width: 2px; }

.done { display: grid; gap: var(--s-1); }
.done p { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-mid); }

/* ----------------------------------------------------------------- beam --- */
/* The only place saturated colour appears, because here it is the payload. */

.beam {
  position: fixed; inset: 0; z-index: 60;
  background: oklch(1 0 0);
  display: grid; place-items: center;
  cursor: pointer;
}
.beam[hidden] { display: none; }
#beam-canvas {
  width: min(96vw, 96svh); height: auto; aspect-ratio: 1;
  image-rendering: pixelated;
}
.beam-hud {
  position: absolute; bottom: max(var(--s0), env(safe-area-inset-bottom));
  left: 0; right: 0;
  display: flex; justify-content: space-between;
  padding: 0 var(--s0);
  font-family: var(--mono); font-size: 0.625rem;
  color: oklch(0.6 0 0);
}

/* ------------------------------------------------------------------ end --- */

.install {
  font-family: var(--mono); font-size: 0.8125rem; line-height: 1.9;
  background: var(--paper-sunk);
  border: 1px solid var(--rule);
  padding: var(--s0); margin: var(--s1) 0 0;
  max-width: 30rem;
  overflow-x: auto;
}

.links { display: flex; gap: var(--s1); margin-top: var(--s1); font-family: var(--mono); font-size: 0.75rem; }
.links a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--rule-firm); }
.links a:hover { border-bottom-color: var(--ink); }

.warn {
  margin-top: var(--s2);
  font-size: 0.8125rem;
  color: var(--ink-soft);
  max-width: 52ch;
  border-top: 1px solid var(--rule);
  padding-top: var(--s0);
}

.noscript { padding: var(--s3); font-family: var(--mono); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 1ms !important; animation-duration: 1ms !important; }
}