/* Colours come from css/palette.css, which is sampled from the bread photo. */

@font-face {
  font-family: "Bagel Fat One";
  src: url("../vendor/fonts/bagel-fat-one-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Figtree";
  src: url("../vendor/fonts/figtree-latin-wght-normal.woff2") format("woff2");
  font-weight: 300 900;
  font-display: swap;
}

:root {
  --page: var(--bread-crumb-light);
  --surface: color-mix(in srgb, var(--bread-crumb-light) 55%, white);
  --ink: var(--char);
  --ink-soft: var(--char-brown);
  --display: "Bagel Fat One", "Arial Rounded MT Bold", "Trebuchet MS", sans-serif;
  --text: "Figtree", system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 500 16px/1.45 var(--text);
  -webkit-font-smoothing: antialiased;
}

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

.masthead {
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 20px 6px;
}

h1 {
  margin: 0;
  font: 400 clamp(44px, 13vw, 88px)/0.95 var(--display);
  letter-spacing: -0.01em;
}

.version {
  display: inline-block;
  padding: 0.3em 0.6em 0.25em;
  border-radius: 999px;
  background: var(--bread-crust-dark);
  color: var(--bread-crumb-light);
  font: 800 0.2em/1 var(--text);
  letter-spacing: 0.02em;
  vertical-align: 2.6em;
}

.masthead p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
}

/* ---------- layout ---------- */

main {
  display: grid;
  gap: 20px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 20px 0;
}

/* ---------- stage: the bread on a dark board ---------- */

.board {
  position: relative;
  display: grid;
  place-items: center;
  padding: clamp(10px, 3vw, 28px);
  border-radius: 32px;
  background:
    radial-gradient(circle at 50% 42%,
      color-mix(in srgb, var(--char-brown) 78%, var(--bread-crust)) 0%,
      var(--char-brown) 68%);
}

#toast {
  display: block;
  width: min(100%, 56vh);
  height: auto;
  aspect-ratio: 1;
  touch-action: none;
  cursor: grab;
  border-radius: 12px;
  filter: drop-shadow(0 14px 16px rgba(0, 0, 0, 0.45));
  opacity: 0;
  transition: opacity 0.25s ease;
}

#toast:active { cursor: grabbing; }

.stage.ready #toast { opacity: 1; }
.stage.processing #toast { opacity: 0; transition-duration: 0.1s; }

#status {
  min-height: 1.45em;
  margin: 10px 4px 0;
  color: var(--ink-soft);
  font-size: 15px;
}

#status.error {
  color: var(--bread-crust-dark);
  font-weight: 700;
}

/* ---------- processing animation: a slice tips over and lands flat ----------
   The drawing and its motion live in assets/bread-flop.svg, generated by
   tools/make_flop_animation.py. */

.flop {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.flop svg {
  width: min(88%, 440px);
  height: auto;
  overflow: visible;
}

.stage.processing .flop,
.stage:not(.ready) .flop {
  visibility: visible;
  opacity: 1;
}

/* ---------- controls ---------- */

.controls {
  display: grid;
  gap: 0;
  align-content: start;
}

.group {
  display: grid;
  gap: 10px;
  padding: 18px 0 20px;
  border-top: 2px solid var(--bread-crumb);
}

.group:first-child {
  border-top: 0;
  padding-top: 4px;
}

h2 {
  margin: 0;
  font: 400 22px/1.1 var(--display);
}

.hint {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.dropzone {
  display: grid;
  gap: 2px;
  padding: 18px 18px 16px;
  border: 2.5px dashed var(--bread-crust);
  border-radius: 22px;
  background: var(--surface);
  cursor: pointer;
  transition: background-color 0.15s;
}

.dropzone:hover { background: var(--bread-crumb); }

.dragging .dropzone {
  border-style: solid;
  background: var(--bread-crumb);
}

.dropzone-title { font: 800 19px/1.2 var(--text); }
.dropzone-note { color: var(--ink-soft); font-size: 14px; }

.samples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.samples span {
  margin-right: 2px;
  color: var(--ink-soft);
  font-size: 14px;
}

/* Buttons heat up: crumb at rest, toasted on hover, crust when pressed. */
button {
  min-height: 44px;
  padding: 8px 16px;
  border: 0;
  border-radius: 999px;
  background: var(--bread-crumb);
  color: var(--ink);
  font: 700 15px/1.2 var(--text);
  cursor: pointer;
  transition: background-color 0.15s;
}

button:hover { background: var(--bread-crust-light); }
button:active { background: var(--bread-crust); }

.samples button {
  min-height: 38px;
  padding: 6px 14px;
  font-size: 14px;
}

button.quiet { justify-self: start; }

button.primary {
  width: 100%;
  min-height: 58px;
  border-radius: 20px;
  background: var(--char);
  color: var(--bread-crumb-light);
  font: 400 21px/1 var(--display);
  letter-spacing: 0.01em;
}

button.primary:hover { background: var(--char-brown); }
button.primary:active { background: var(--bread-crust-dark); }

button:disabled,
button.primary:disabled {
  background: var(--bread-crumb);
  color: color-mix(in srgb, var(--char-brown) 55%, var(--bread-crumb));
  cursor: not-allowed;
}

details summary {
  width: fit-content;
  padding: 6px 0;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

textarea {
  display: block;
  width: 100%;
  margin: 4px 0 8px;
  padding: 10px 12px;
  border: 2px solid var(--bread-crumb);
  border-radius: 14px;
  background: var(--surface);
  color: var(--ink);
  font: 13px/1.4 ui-monospace, Menlo, Consolas, monospace;
  resize: vertical;
}

/* Burn style switch */
.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 4px;
  border-radius: 999px;
  background: var(--bread-crumb);
}

.segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented label {
  display: grid;
  place-items: center;
  min-height: 42px;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
}

.segmented input:checked + label {
  background: var(--char);
  color: var(--bread-crumb-light);
}

.segmented input:focus-visible + label {
  outline: 3px solid var(--bread-crust-dark);
  outline-offset: 3px;
}

.warning {
  padding: 12px 14px;
  border-left: 6px solid var(--bread-crust-dark);
  border-radius: 6px 14px 14px 6px;
  background: var(--bread-crumb);
  font-size: 14px;
}

.warning p { margin: 0 0 6px; }

/* Sliders */
label.slider {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 2px;
  font-weight: 600;
  font-size: 15px;
}

output {
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  --fill: 50%;
  --track: var(--bread-crumb);
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 28px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 12px;
  border-radius: 999px;
  background:
    linear-gradient(to right, transparent var(--fill), var(--track) var(--fill)),
    var(--bread-crust);
}

input[type="range"]::-moz-range-track {
  height: 12px;
  border-radius: 999px;
  background:
    linear-gradient(to right, transparent var(--fill), var(--track) var(--fill)),
    var(--bread-crust);
}

/* Burn sliders fill with the burn itself: toasted, then crust, then char. */
input[type="range"].heat::-webkit-slider-runnable-track {
  background:
    linear-gradient(to right, transparent var(--fill), var(--track) var(--fill)),
    linear-gradient(to right, var(--bread-toasted), var(--bread-crust-dark) 55%, var(--char));
}

input[type="range"].heat::-moz-range-track {
  background:
    linear-gradient(to right, transparent var(--fill), var(--track) var(--fill)),
    linear-gradient(to right, var(--bread-toasted), var(--bread-crust-dark) 55%, var(--char));
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 26px;
  height: 26px;
  margin-top: -7px;
  border: 4px solid var(--bread-crumb-light);
  border-radius: 50%;
  background: var(--char);
  box-shadow: 0 0 0 2px var(--char);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 4px solid var(--bread-crumb-light);
  border-radius: 50%;
  background: var(--char);
  box-shadow: 0 0 0 2px var(--char);
}

label.check {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 32px;
  font-weight: 600;
  font-size: 15px;
}

input[type="checkbox"] {
  width: 22px;
  height: 22px;
  margin: 0;
  accent-color: var(--char);
}

/* Download stays within thumb reach on phones. */
.save {
  position: sticky;
  bottom: 0;
  z-index: 2;
  padding: 14px 0 max(14px, env(safe-area-inset-bottom));
  background: linear-gradient(to bottom, transparent, var(--page) 34%);
}

/* ---------- footer ---------- */

footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 20px 36px;
  color: var(--ink-soft);
  font-size: 14px;
}

footer p { margin: 0; }

.swatches {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.swatches li {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  box-shadow: 0 0 0 1.5px color-mix(in srgb, var(--char) 22%, transparent);
}

/* ---------- shared ---------- */

#toast:focus-visible,
button:focus-visible,
summary:focus-visible,
textarea:focus-visible,
input[type="range"]:focus-visible,
input[type="checkbox"]:focus-visible {
  outline: 3px solid var(--bread-crust-dark);
  outline-offset: 3px;
}

#toast:focus-visible { outline-color: var(--bread-crumb-light); }

.dropzone:has(+ #file:focus-visible) {
  outline: 3px solid var(--bread-crust-dark);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (min-width: 900px) {
  .masthead { padding-top: 34px; }

  main {
    grid-template-columns: minmax(0, 1fr) 380px;
    align-items: start;
    gap: 40px;
    padding-top: 22px;
  }

  .stage {
    position: sticky;
    top: 20px;
  }

  #toast { width: min(100%, 72vh); }

  .save {
    position: static;
    padding-bottom: 0;
    background: none;
  }
}