/* One family (Instrument Sans, width + weight axes) and one accent. The result
   is typeset as data: each emotion is a word whose size, weight and width follow
   its probability. Square corners everywhere. Follows prefers-color-scheme. */

@font-face {
  font-family: "Instrument Sans";
  src: url("../fonts/InstrumentSans-Variable.woff2") format("woff2");
  font-weight: 400 700;
  font-stretch: 75% 100%;
  font-display: swap;
}

:root {
  --bg: #eceff2;
  --text: #12161d;
  --muted: #5d6572;
  --line: #cbd1d8;
  --accent: #1f3fff;
  --accent-ink: #ffffff;
  --danger: #b42318;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  /* spacing: one 8px scale; the 24px step is both the grid gutter and the outer margin */
  --s1: 8px; --s2: 16px; --s3: 24px; --s4: 32px; --s6: 48px;
  --sans: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1015;
    --text: #e8ebf0;
    --muted: #9aa3b0;
    --line: #272c35;
    --accent: #8196ff;
    --accent-ink: #0d1015;
    --danger: #f97066;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 1rem/1.5 var(--sans); min-height: 100dvh; font-variant-numeric: tabular-nums; }
a { color: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* whole-page drop target */
body.over::after { content: ""; position: fixed; inset: 12px; border: 2px dashed var(--accent); pointer-events: none; }

/* ---------- top bar ---------- */
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; max-width: 1240px; height: 64px; margin: 0 auto; padding: 0 24px; }
.brand { font-weight: 700; font-stretch: 75%; font-size: 1.125rem; text-decoration: none; letter-spacing: -0.01em; }
.links { display: flex; gap: 4px; }
.link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 12px; color: var(--muted); text-decoration: none; font-size: 0.9375rem; transition: color 150ms ease, transform 120ms var(--ease-out); }
.link:active { transform: scale(0.97); }
@media (hover: hover) and (pointer: fine) { .link:hover { color: var(--text); } }

/* ---------- icons: masks, so they take currentColor ---------- */
.icon { display: inline-block; width: 1.25em; height: 1.25em; background: currentColor; mask: var(--icon) center / contain no-repeat; -webkit-mask: var(--icon) center / contain no-repeat; flex: none; }
.icon-github { --icon: url("../icons/github-logo.svg"); }
.icon-warning { --icon: url("../icons/warning-circle.svg"); color: var(--danger); }

/* ---------- layout: a 12-column grid, 24px gutter equal to the outer margin ---------- */
/* Two equal halves (photo | reading), and the reading is three equal thirds (crop | heatmap |
   timings), so every edge lands on a column line. The photo keeps its place from the first
   screen to the result. Below 900px it is one column. */
main { max-width: 1240px; margin: 0 auto; padding: 0 var(--s3) var(--s6); display: grid; gap: var(--s4) var(--s3); grid-template-columns: minmax(0, 1fr); }
.intro, .stage, .results { min-width: 0; }
@media (min-width: 900px) {
  main { grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--s3); align-items: start; padding-top: var(--s3); }
  .stage { grid-column: 1 / span 6; grid-row: 1; }
  .intro { grid-column: 7 / span 6; grid-row: 1; align-self: center; }
  .results { display: none; }
  .note { grid-column: 1 / -1; grid-row: 2; margin: 0; }
  #app:is([data-state="loading"], [data-state="analyzing"], [data-state="result"], [data-state="live"]) .intro { grid-column: 1 / -1; align-self: start; }
  #app:is([data-state="loading"], [data-state="analyzing"], [data-state="result"], [data-state="live"]) .stage { grid-row: 2; position: sticky; top: var(--s3); }
  #app:is([data-state="loading"], [data-state="analyzing"], [data-state="result"], [data-state="live"]) .results { display: grid; grid-column: 7 / span 6; grid-row: 2; grid-template-columns: subgrid; row-gap: var(--s3); align-content: start; align-items: end; }
  #app:is([data-state="loading"], [data-state="analyzing"], [data-state="result"], [data-state="live"]) .note { grid-row: 3; }
  .results :is(.strip, .words, .ghost) { grid-column: 1 / -1; }
  .results :is(.faces, .face, .views) { display: contents; }
  .results .strip { margin: 0; }
  .results .view { grid-column: span 2; }
  .results .timings { grid-column: span 2; flex-direction: column; gap: var(--s1); border-top: 0; padding: 0 0 calc(0.875rem * 1.5 + var(--s1)); }
  .results .timings div { flex-direction: column; gap: 0; }
  .results .timings dd { font-size: 1.0625rem; }
  .results .words { --r: clamp(2.75rem, 5.2vw, 5rem); }
}

h1 { margin: 0 0 var(--s3); font-size: clamp(2.5rem, 5vw, 4.25rem); line-height: 0.98; letter-spacing: -0.035em; font-weight: 700; font-stretch: 80%; text-wrap: balance; }
.lede { margin: 0 0 var(--s3); color: var(--muted); max-width: 38ch; font-size: 1.125rem; text-wrap: pretty; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px; }
.hint { margin: var(--s2) 0 0; font-size: 0.875rem; color: var(--muted); max-width: 46ch; }
.actions + .hint { margin-top: var(--s3); }
.hint + .hint { margin-top: var(--s1); }

/* once a photo is in, the intro collapses to a single row of controls */
#app:is([data-state="loading"], [data-state="analyzing"], [data-state="result"], [data-state="live"]) :is(h1, .lede, .hint) { display: none; }

.btn {
  min-height: 44px; padding: 0 22px; border: 1px solid var(--line); border-radius: 0;
  background: transparent; color: var(--text); font: inherit; font-weight: 600; cursor: pointer;
  transition: transform 120ms var(--ease-out), background-color 150ms ease, border-color 150ms ease, color 150ms ease;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-quiet { border-color: transparent; padding: 0 2px; color: var(--text); font-weight: 500; text-decoration: underline; text-underline-offset: 5px; text-decoration-color: var(--line); text-decoration-thickness: 2px; }
@media (hover: hover) and (pointer: fine) {
  .btn:hover { border-color: var(--text); }
  .btn-primary:hover { filter: brightness(1.08); border-color: var(--accent); }
  .btn-quiet:hover { border-color: transparent; text-decoration-color: var(--accent); }
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- the example plate (first screen) ---------- */
.plate { position: relative; display: block; width: 100%; max-width: 640px; margin: 0; padding: 0; border: 0; background: none; cursor: pointer; text-align: left; font: inherit; color: inherit; }
.plate img { display: block; width: 100%; height: auto; }
.plate-box { position: absolute; left: 30%; top: 25%; width: 34.5%; height: 42.5%; border: 2px solid var(--accent); box-shadow: 0 0 0 1px rgb(255 255 255 / 0.55); transition: transform 200ms var(--ease-out); }
.plate-cap { display: block; margin-top: var(--s1); font-size: 0.875rem; color: var(--muted); }
@media (hover: hover) and (pointer: fine) { .plate:hover .plate-box { transform: scale(1.04); } }
.plate:active .plate-box { transform: scale(0.98); }
#app:not([data-state="idle"], [data-state="error"]) .plate { display: none; }
.plate:disabled { cursor: not-allowed; }

/* ---------- photo stage ---------- */
.photo { position: relative; line-height: 0; overflow: hidden; opacity: 0; transform: scale(0.99); transition: opacity 220ms var(--ease-out), transform 220ms var(--ease-out); }
.photo.in { opacity: 1; transform: none; }
.photo canvas { display: block; width: 100%; height: auto; transition: opacity 200ms ease; }
#app[data-state="analyzing"] .photo canvas { opacity: 0.6; }

.boxes { position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity 200ms var(--ease-out); }
.boxes.in { opacity: 1; }
.box { position: absolute; border: 2px solid var(--accent); box-shadow: 0 0 0 1px rgb(255 255 255 / 0.55); transition: opacity 150ms ease; }
.box .tag { position: absolute; left: -2px; top: -2px; transform: translateY(-100%); white-space: nowrap; min-width: 24px; padding: 0 7px; background: var(--accent); color: var(--accent-ink); font: 700 0.8125rem/1.5 var(--sans); text-align: center; }
.boxes.multi .box { pointer-events: auto; cursor: pointer; opacity: 0.6; }
.boxes.multi .box.active, .boxes.multi .box:hover { opacity: 1; }
.box.stale { opacity: 0.35 !important; }
.pick.stale { opacity: 0.4; }

/* ---------- progress / status / error ---------- */
.progress { height: 2px; margin-top: var(--s2); overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); transform-origin: left; transform: scaleX(0); transition: transform 120ms linear; }
.status { min-height: 1.5em; margin: var(--s2) 0 0; color: var(--muted); font-size: 0.9375rem; }
.error { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); margin-top: var(--s2); padding: var(--s2) 0; border-block: 1px solid var(--danger); }
.error p { margin: 0; flex: 1 1 220px; }

/* face picker: shown only when there is more than one face */
.strip { display: flex; flex-wrap: wrap; gap: var(--s1); margin-bottom: var(--s3); }
.pick { position: relative; width: 56px; height: 56px; padding: 0; border: 2px solid transparent; background: var(--line); cursor: pointer; transition: border-color 150ms ease, transform 120ms var(--ease-out); }
.pick:active { transform: scale(0.96); }
.pick canvas { display: block; width: 100%; height: 100%; }
.pick[aria-pressed="true"] { border-color: var(--accent); }
.pick-n { position: absolute; left: 0; top: 0; min-width: 18px; padding: 0 4px; background: var(--accent); color: var(--accent-ink); font: 700 0.75rem/1.4 var(--sans); text-align: center; }
@media (hover: hover) and (pointer: fine) { .pick:hover { border-color: var(--muted); } .pick[aria-pressed="true"]:hover { border-color: var(--accent); } }

/* ---------- the reading: emotions typeset by probability ---------- */
.faces { list-style: none; margin: 0; padding: 0; }
.face {
  position: relative; padding: 0 0 var(--s6);
  opacity: 0; transform: translateY(8px);
  transition: opacity 240ms var(--ease-out), transform 240ms var(--ease-out);
  transition-delay: calc(var(--i, 0) * 60ms);
}
.face + .face { padding-top: var(--s4); border-top: 1px solid var(--line); }
.face.in { opacity: 1; transform: none; }

.words { --r: clamp(2.75rem, 8vw, 6.5rem); list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.1em 0.7em; font-size: 1rem; }
.face-tag { align-self: flex-start; margin: 0.45rem 0.25rem 0 0; min-width: 24px; padding: 0 7px; background: var(--accent); color: var(--accent-ink); font: 700 0.8125rem/1.5 var(--sans); text-align: center; }
.word {
  display: inline-flex; align-items: baseline; gap: 0.3em; color: var(--muted);
  font-size: calc(1.05rem + var(--p) * var(--r));
  font-weight: calc(420 + var(--p) * 280);
  font-stretch: calc(88% + var(--p) * 12%);
  letter-spacing: calc(-0.005em - var(--p) * 0.03em);
  line-height: 0.95;
}
.word.top { color: var(--text); }
/* emotions under 1% share one muted line instead of a row of 0% */
.word-quiet { flex-basis: 100%; margin-top: 0.5rem; font-size: 0.875rem; color: var(--muted); line-height: 1.4; }
.word .pct { font-size: 0.8125rem; font-weight: 500; font-stretch: 100%; letter-spacing: 0; line-height: 1; color: var(--muted); }
.word.top .pct { font-size: 1rem; font-weight: 600; color: var(--accent); }

.views { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s2); margin-top: var(--s3); }
.view { margin: 0; }
.view canvas { display: block; width: 100%; height: auto; aspect-ratio: 1; background: var(--line); }
.view figcaption { margin-top: var(--s1); font-size: 0.875rem; color: var(--muted); }

/* while the model downloads or the photo is analyzed, the reading's place is held,
   so the page does not jump when the answer arrives */
.ghost { display: none; }
#app:is([data-state="loading"], [data-state="analyzing"]) .ghost { display: block; padding: 0 0 var(--s6); }
.ghost-word { width: 62%; height: clamp(2.75rem, 7vw, 5.5rem); background: var(--line); }
.ghost-views { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s2); margin-top: var(--s3); }
@media (min-width: 900px) { .ghost, #app:is([data-state="loading"], [data-state="analyzing"]) .ghost { padding: 0; } .ghost-views { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s3); } }
.ghost-views div { aspect-ratio: 1; background: var(--line); }
.ghost-word, .ghost-views div { animation: hold 1.4s ease-in-out infinite alternate; }
@keyframes hold { from { opacity: 0.45; } to { opacity: 1; } }

/* timings: a line of numbers */
.timings { display: flex; flex-wrap: wrap; gap: var(--s1) var(--s3); margin: 0; padding-top: var(--s2); border-top: 1px solid var(--line); }
.timings div { display: flex; gap: 8px; align-items: baseline; }
.timings dt { font-size: 0.875rem; color: var(--muted); }
.timings dd { margin: 0; font-size: 0.9375rem; font-weight: 600; }

.note { margin: var(--s1) 0 0; max-width: 64ch; font-size: 0.875rem; color: var(--muted); }

/* ---------- small screens: the two main actions share the row ---------- */
@media (max-width: 599px) {
  .actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .actions .btn { padding: 0 12px; min-width: 0; }
  .actions .btn-quiet { grid-column: 1 / -1; justify-self: start; padding: 0 2px; }
}

/* ---------- reduced motion: no movement, only short fades ---------- */
@media (prefers-reduced-motion: reduce) {
  .ghost-word, .ghost-views div { animation: none; opacity: 0.7; }
  .link:active { transform: none; }
  .photo, .face { transform: none; transition-property: opacity; transition-duration: 120ms; transition-delay: 0ms; }
  .btn:active, .pick:active, .plate:active .plate-box, .plate:hover .plate-box { transform: none; }
  .progress-fill { transition: none; }
}