/* annagram. Everything pixel-y sits on one grid: --u is one native pixel of the
   portrait, the logo, the bubble border, and the tail. */

:root {
  --u: 3px;
  --sprite: calc(104 * var(--u));             /* anna.png is 104×104 */
  --cut: 59.615%;                              /* the mouth: row 62 of 104 */
  --mouth-y: calc(62 * var(--u));
  --tail-top: calc(3 * var(--u));
  --tail-center: calc(7.5 * var(--u));         /* middle row of the tail drawn in app.js */

  /* Four roles: background, primary, secondary, pink. Everything else aliases them. */
  --room: #f1f1f4;
  --text: #24242b;
  --muted: #686875;
  --pink: #d6187f;
  --fill: #ffffff;                             /* the bubble's surface */
  --ink: var(--text);
  --guess: var(--muted);                       /* letters she was guessing */
  --known: var(--text);                        /* letters from a long stretch of Anna */
  --logo: url("assets/logo-ink.png");

  --body-font: "IBM Plex Mono", ui-monospace, "Courier New", monospace;
  --say-font: "Pixelify Sans", "IBM Plex Mono", monospace;
  --say-size: calc(8 * var(--u));
  --say-line: calc(12 * var(--u));
  --logo-u: 2px;                               /* the logo's own pixel; smaller than --u on purpose */
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --room: #18181c; --text: #e8e8ee; --muted: #9a9aa6; --pink: #ff5fae; --fill: #232329;
    --logo: url("assets/logo-pale.png");
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --room: #18181c; --text: #e8e8ee; --muted: #9a9aa6; --pink: #ff5fae; --fill: #232329;
  --logo: url("assets/logo-pale.png");
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--room); }
body {
  margin: 0;
  background: var(--room);
  color: var(--text);
  font: 400 1rem/1.55 var(--body-font);
}
main { max-width: 64rem; margin: 0 auto; padding: 1rem 1rem 4rem; }
:focus-visible { outline: 2px solid var(--pink); outline-offset: 2px; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---- logo: ink pixel art; the cursor makes the letters shimmer pink (canvas, app.js) ---- */
.logo { margin: 0.25rem 0 0.5rem; display: flex; justify-content: center; }
.logo-img {
  position: relative;
  display: block;
  width: calc(232 * var(--logo-u));
  max-width: 100%;
  aspect-ratio: 232 / 45;
  background: var(--logo) center / contain no-repeat;
  image-rendering: pixelated;
  touch-action: pan-y;
}
.logo-img canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  image-rendering: pixelated;
}

/* ---- stage ---- */
/* Two columns: Anna, then the letter inspector, on the left; the bubble, then its
   key and controls, on the right. */
.stage {
  display: grid;
  grid-template-columns: var(--sprite) minmax(0, 1fr);
  grid-template-areas: "anna speech";
  column-gap: calc(16 * var(--u));
  row-gap: calc(8 * var(--u));
  align-items: start;
}
.anna { grid-area: anna; }
/* The bubble and its controls are one column, so the controls hang right off the
   bubble however long the speech gets. */
.speech { grid-area: speech; min-width: 0; }

/* ---- Anna: a cut-out puppet hinged at the mouth ---- */
.anna { position: relative; width: var(--sprite); height: var(--sprite); cursor: pointer; }
.skull, .jaw {
  position: absolute;
  inset: 0;
  background: url("assets/anna.png") 0 0 / 100% 100% no-repeat;
  image-rendering: pixelated;
}
.skull { clip-path: inset(0 0 calc(100% - var(--cut) - 1px) 0); transform-origin: 30% var(--cut); }
.jaw { clip-path: inset(var(--cut) 0 0 0); }
.mouth {
  position: absolute;
  left: 30%; right: 30%;
  top: calc(var(--cut) - 8 * var(--u));
  height: calc(10 * var(--u));
  background: #3a1d24;
}
/* Rock on alternating hinges, in hard steps: puppet, not physics. */
.anna.talk-l .skull { transform-origin: 30% var(--cut); transform: rotate(-8deg); }
.anna.talk-r .skull { transform-origin: 70% var(--cut); transform: rotate(8deg); }
@media (prefers-reduced-motion: reduce) {
  .anna.talk-l .skull, .anna.talk-r .skull { transform: none; }
}

/* ---- the bubble: pixel border (2 units, notched corners), pixel tail ---- */
.bubble {
  position: relative;
  /* Hang the bubble so the tail's tip lines up with Anna's mouth. */
  margin: calc(var(--mouth-y) - var(--tail-top) - var(--tail-center)) calc(2 * var(--u)) 0;
  padding: calc(5 * var(--u)) calc(7 * var(--u));
  background: var(--fill);
  box-shadow:
    0 calc(-2 * var(--u)) 0 0 var(--ink), 0 calc(2 * var(--u)) 0 0 var(--ink),
    calc(-2 * var(--u)) 0 0 0 var(--ink), calc(2 * var(--u)) 0 0 0 var(--ink);
}
.tail { position: absolute; display: block; shape-rendering: crispEdges; overflow: visible; }
.tail .o { fill: var(--ink); }
.tail .f { fill: var(--fill); }
.tail-side { top: var(--tail-top); right: 100%; }
.tail-up { display: none; }

.output {
  margin: 0;
  min-height: calc(2 * var(--say-line));
  font: 400 var(--say-size)/var(--say-line) var(--say-font);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}
.given { color: var(--muted); }
.tok {
  color: color-mix(in srgb, var(--known) calc(var(--a, 1) * 100%), var(--guess));
}
.tok.sparkle { color: var(--pink); }
.redacted {
  display: inline-block;
  width: calc(var(--len, 5) * 0.6em);
  height: 0.95em;
  vertical-align: -0.12em;
  background: var(--text);
}
.tok.redacted { color: transparent; background: var(--text); }

/* ---- under the bubble: [rand] and [given]: ---- */
.side { min-width: 0; margin: calc(9 * var(--u)) calc(2 * var(--u)) 0; }

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1.5rem;
  font: 700 1.05rem/1.2 var(--body-font);   /* the pixel font draws [ ] like ( ) */
}
.rand, .given-tag {
  font: inherit;
  color: var(--pink);
  background: none;
  border: 0;
  padding: 0.1rem 0.3rem;
  margin: 0 -0.3rem;
}
.rand { cursor: pointer; }
.rand:hover { text-decoration: underline; text-decoration-thickness: var(--u); text-underline-offset: 0.2em; }
/* The mode that made the current speech is filled in, like a lit key. */
.controls[data-mode="rand"] .rand, .controls[data-mode="given"] .given-tag { background: var(--pink); color: var(--fill); text-decoration: none; }
/* [given]: is a prompt living inside its own underlined line, not a button. */
.given-line {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: 1ch;
  min-width: 14rem;
  border-bottom: var(--u) solid var(--guess);
  padding-bottom: 0.15rem;
  font-weight: 400;
  color: var(--muted);
  cursor: text;
}
.given-tag { font-weight: 700; color: var(--muted); }
.given-line:focus-within { border-bottom-color: var(--pink); }
.given-line input {
  flex: 1;
  min-width: 0;
  font: 400 1rem/1.4 var(--body-font);
  color: var(--text);
  background: transparent;
  border: 0;
  padding: 0;
}
.given-line input:focus { outline: none; }
.given-line input::placeholder { color: transparent; }
.given-line input { caret-color: var(--pink); }
.given-line .cursor { display: none; order: 1; color: var(--muted); font-weight: 400; pointer-events: none; }
.given-line input { order: 2; }
.given-line:has(input:placeholder-shown:not(:focus)) .cursor { display: inline; }


/* ---- letter inspector: P(c | h) for the last (or hovered) letter ---- */
.tok { cursor: crosshair; }
.tok.in-ctx { background: color-mix(in srgb, var(--pink) 14%, transparent); }   /* h */
.tok.inspected { background: color-mix(in srgb, var(--pink) 38%, transparent); } /* c */
.inspector { margin: 0; font-size: 0.8rem; color: var(--muted); }
.inspector figcaption { display: grid; gap: 0.1rem; margin-bottom: 0.6rem; }
.insp-math { font: 400 0.95rem/1.4 var(--body-font); color: var(--text); overflow-wrap: anywhere; }
.insp-math i { font-style: italic; }
.insp-pick b { font: 600 1.05rem/1 var(--say-font); color: var(--text); }
.insp-pick b.sig { color: var(--pink); }
.insp-class { margin: 0 0 0.6rem; color: var(--text); }
.insp-class b { font-weight: 700; }
.insp-class b.guess { color: var(--muted); }
.insp-class b.sig { color: var(--pink); }
.insp-hint { margin: 0.6rem 0 0; font-size: 0.75rem; }
.bars { display: grid; gap: 2px; }
.bar-row { display: grid; grid-template-columns: 1.4rem minmax(0, 1fr) 3.6rem; align-items: center; gap: 0.5rem; }
.bar-char { font: 600 1.05rem/1.4 var(--say-font); color: var(--text); text-align: center; }
.bar { height: 0.7rem; min-width: 2px; background: var(--guess); }   /* square ends: it's a pixel world */
.bar-val { text-align: right; font-variant-numeric: tabular-nums; }
/* The sampled letter's bar is ink; it's pink only if the pick was signature Anna. */
.bar { opacity: 0.55; }
.bar-row.picked .bar { background: var(--text); opacity: 1; }
.bar-row.picked .bar-char, .bar-row.picked .bar-val { color: var(--text); font-weight: 700; }
.bars.sig .bar-row.picked .bar { background: var(--pink); }
.bars.sig .bar-row.picked .bar-char { color: var(--pink); }

/* ---- how it works: one readable column; the formula hides behind [show the math] ---- */
.about { margin-top: 9rem; padding-top: 2.5rem; border-top: var(--u) solid color-mix(in srgb, var(--muted) 25%, transparent); font-size: 0.92rem; color: var(--muted); }
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 42rem) minmax(15rem, 19rem);
  justify-content: space-between;
  gap: 2.5rem 3.5rem;
  align-items: start;
}
.about-grid .inspector { position: sticky; top: 1.5rem; }
.about h2 { margin: 0 0 1.25rem; font: 600 max(calc(7 * var(--u)), 1.35rem)/1.2 var(--say-font); color: var(--text); }
.about h3 { margin: 1.5rem 0 0.4rem; font: 700 0.95rem/1.3 var(--body-font); color: var(--text); }
.about p { margin: 0 0 0.75rem; }
.about b { font-weight: 700; color: var(--text); }
.math { margin: 0.25rem 0 0.75rem; }
.math summary { cursor: pointer; font-weight: 700; color: var(--pink); list-style: none; width: max-content; }
.math summary::-webkit-details-marker { display: none; }
.math summary:hover { text-decoration: underline; text-decoration-thickness: var(--u); text-underline-offset: 0.2em; }
.math[open] summary .show { display: none; }
.math:not([open]) summary .hide { display: none; }
.eq-card {
  margin-top: 0.9rem;
  padding: calc(6 * var(--u)) calc(7 * var(--u));
  background: var(--fill);
  box-shadow:
    0 calc(-1 * var(--u)) 0 0 var(--ink), 0 var(--u) 0 0 var(--ink),
    calc(-1 * var(--u)) 0 0 0 var(--ink), var(--u) 0 0 0 var(--ink);
}
.eq { margin: 0 0 1rem; font: 400 1.05rem/1.6 var(--body-font); color: var(--text); }
.eq .nobr { white-space: nowrap; }
.eq i, .eq-key i { font-style: italic; }
.frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; font-size: 0.85em; margin: 0 0.2em; }
.frac > span + span { border-top: 1px solid currentColor; }
.eq-key { display: grid; grid-template-columns: auto 1fr; gap: 0.35rem 0.9rem; margin: 0; font-size: 0.82rem; }
.eq-key dt { color: var(--text); white-space: nowrap; }
.eq-key dd { margin: 0; }

/* ---- narrow: Anna on top, bubble below with the tail pointing up ---- */
@media (max-width: 760px) {
  :root { --u: 2px; --logo-u: 1.5px; }
  .stage {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "anna" "speech";
    justify-items: center;
  }
  .bubble { margin: calc(14 * var(--u)) calc(2 * var(--u)) 0; width: calc(100% - 4 * var(--u)); }
  .about { margin-top: 5rem; }
  .about-grid { grid-template-columns: minmax(0, 1fr); }
  .about-grid .inspector { position: static; }
  .speech { justify-self: stretch; }
  .tail-side { display: none; }
  .tail-up { display: block; bottom: 100%; left: calc(50% - var(--tail-center)); }
}
.about-text > h3:first-child { margin-top: 0; }