/* Warm grays, one accent for what you can move, no boxes (as on QR Scan Difficulty).
   Zone tones are one ordinal ramp (darker = more scanners read it). Your pictures are ink lines, cased in the
   page's colour so they stay visible on every tone. */
:root {
  color-scheme: light;
  --surface: #f5f4f0;
  --ink: #1c1b18;
  --ink-2: #5c5a53;
  --ink-3: #727068;
  --rule: #dfddd6;
  --accent: #d4541c;
  --z-every: #1c1b18;
  --z-most: #54524b;
  --z-some: #86837a;
  --z-none: #aaa79d;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --surface: #1c1b18;
    --ink: #eceae4;
    --ink-2: #b9b6ad;
    --ink-3: #8a877e;
    --rule: #33322e;
    --accent: #e0602a;
    --z-every: #eceae4;
    --z-most: #b2afa6;
    --z-some: #7b7870;
    --z-none: #55534d;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface: #1c1b18;
  --ink: #eceae4;
  --ink-2: #b9b6ad;
  --ink-3: #8a877e;
  --rule: #33322e;
  --accent: #e0602a;
  --z-every: #eceae4;
  --z-most: #b2afa6;
  --z-some: #7b7870;
  --z-none: #55534d;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--surface); }
body {
  color: var(--ink);
  font: 17px/1.55 system-ui, -apple-system, "Helvetica Neue", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
.page { max-width: 1040px; margin: 0 auto; padding: 56px 24px 72px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.kicker { margin: 0 0 14px; font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
h1 { margin: 0; font-size: clamp(32px, 5vw, 48px); line-height: 1.08; font-weight: 600; letter-spacing: -0.02em; max-width: 14em; text-wrap: balance; }
.lede { margin: 18px 0 0; font-size: 20px; line-height: 1.5; color: var(--ink-2); max-width: 36em; }
.fine { margin: 10px 0 0; font-size: 13px; color: var(--ink-3); max-width: 52em; }
.block { padding: 56px 0 0; }
.block + .block { margin-top: 40px; border-top: 1px solid var(--rule); }
a { color: inherit; text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

/* the one action */
.add { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; margin-top: 30px; }
.button {
  font: inherit; font-size: 15px; font-weight: 600; color: var(--surface); background: var(--ink);
  border: 0; border-radius: 999px; padding: 10px 22px; cursor: pointer;
}
.button:hover { background: var(--ink-2); }
.add-note { margin: 0; font-size: 14px; color: var(--ink-3); }

/* the bell, then your list under it; beside both, the code or picture at the cursor, kept in view as you scroll on a
   wide screen (a narrow one stacks bell, panel, list) */
.spectrum {
  display: grid; grid-template-columns: minmax(0, 1fr) 220px; grid-template-rows: auto auto 1fr; column-gap: 40px;
  grid-template-areas: "bell panel" "list panel" ". panel"; align-items: start;
}
.bell-figure { grid-area: bell; }
.specimen { grid-area: panel; }
.your-list { grid-area: list; min-width: 0; }
@media (max-width: 760px) {
  .spectrum { grid-template-columns: minmax(0, 1fr); grid-template-rows: none; grid-template-areas: "bell" "panel" "list"; }
  .specimen { margin-top: 24px; }
}
.bell-figure { margin: 0; }
.chart { display: block; width: 100%; overflow: visible; touch-action: pan-y; }
svg text { fill: var(--ink-2); font: 13px system-ui, -apple-system, "Helvetica Neue", "Segoe UI", sans-serif; }
svg .muted { fill: var(--ink-3); }
svg .marker-n { fill: var(--surface); font-size: 11px; font-weight: 600; font-variant-numeric: tabular-nums; }
svg .marker-n.mine { fill: var(--ink); } /* the open marker of the picture beside the bell */
svg .marker-more { font-size: 11px; font-variant-numeric: tabular-nums; }
.range { -webkit-appearance: none; appearance: none; width: 100%; height: 22px; margin: 6px 0 0; background: transparent; cursor: pointer; }
.range::-webkit-slider-runnable-track { height: 1px; background: var(--rule); }
.range::-moz-range-track { height: 1px; background: var(--rule); }
.range::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; margin-top: -6.5px; border-radius: 50%; background: var(--accent); border: 2px solid var(--surface); }
.range::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); border: 2px solid var(--surface); }
.bell-key { margin: 0 0 14px; }
.readout { margin: 10px 0 0; font-size: 15px; line-height: 1.45; color: var(--ink); font-variant-numeric: tabular-nums; min-height: 2.9em; } /* two lines, so your list stays put */
.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 2px; margin-right: 6px; vertical-align: -1px; }
.key { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 13px; color: var(--ink-2); margin: 14px 0 0; }
.key-title { color: var(--ink-3); }

.specimen { display: grid; gap: 10px; align-content: start; scroll-margin-top: 24px; }
.specimen img { width: 100%; max-width: 220px; aspect-ratio: 1; display: block; border-radius: 2px; background: var(--rule); }
.specimen .big { font-size: 22px; line-height: 1.25; font-weight: 600; text-wrap: balance; }
.specimen .small { font-size: 14px; color: var(--ink-2); text-wrap: pretty; }
.specimen .entry { white-space: nowrap; }
.specimen .src { font-size: 13px; color: var(--ink-3); }
.specimen .scan-it { display: inline-block; margin: 8px 0 4px; font-size: 13px; color: var(--ink-2); }
/* your picture in the measured code's place: whole, with transparent parts on white, as it was read */
.specimen .yours {
  width: 100%; max-width: 220px; aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  border-radius: 2px; background: var(--rule);
}
.specimen .yours img { width: 100%; height: auto; max-height: 100%; aspect-ratio: auto; background: #fff; }
.specimen .yours img.tall { width: auto; height: 100%; max-width: 100%; }
.specimen .yours .unshown { width: 100%; height: 100%; border-radius: 2px; background: var(--rule); }
.specimen .yours-name { display: flex; align-items: center; gap: 8px; min-width: 0; margin: 8px 0 4px; font-size: 13px; color: var(--ink-2); }
.yours-name .pic-n { flex: none; }
.yours-file { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.specimen .yours-content { overflow-wrap: anywhere; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
/* kept in view beside the list wherever the panel fits the window; on a short one, with a smaller picture */
@media (min-width: 761px) and (min-height: 560px) { .specimen { position: sticky; top: 24px; } }
@media (min-width: 761px) and (max-height: 699px) {
  .specimen { top: 16px; scroll-margin-top: 16px; }
  .specimen > img, .specimen .yours { max-width: 150px; }
}
.linklike {
  font: inherit; font-size: 14px; color: var(--ink-2); background: none; border: 0; padding: 0; cursor: pointer;
  text-align: left; text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--rule); justify-self: start;
}
.linklike:hover { color: var(--ink); text-decoration-color: var(--ink-3); }

/* your pictures */
.pictures { list-style: none; margin: 36px 0 0; padding: 0; border-bottom: 1px solid var(--rule); }
.picture { display: grid; grid-template-columns: minmax(0, 1fr); grid-auto-flow: column; grid-auto-columns: auto; align-items: center; gap: 8px; border-top: 1px solid var(--rule); }
/* the one beside the bell: a light tint reaching a little past the rules, and an open number, as on the bell */
.picture.chosen {
  --tint: color-mix(in srgb, var(--ink) 6%, var(--surface));
  background: var(--tint); box-shadow: -10px 0 0 var(--tint), 10px 0 0 var(--tint);
}
.picture.chosen .pic-content { color: var(--ink-2); } /* AA on the tint */
.pic-main {
  display: grid; grid-template-columns: 20px 48px minmax(0, 1fr); gap: 14px; align-items: center;
  padding: 12px 0; background: none; border: 0; text-align: left; font: inherit; color: inherit; cursor: pointer; min-width: 0;
}
.pic-main:disabled { cursor: default; }
.pic-n {
  width: 20px; height: 20px; border-radius: 50%; background: var(--ink); color: var(--surface); font-size: 11px;
  font-weight: 600; line-height: 20px; text-align: center; font-variant-numeric: tabular-nums;
}
.picture.chosen .pic-n, .pic-n.mine { background: none; color: var(--ink); box-shadow: inset 0 0 0 2px var(--ink); }
.pic-thumb { width: 48px; height: 48px; object-fit: cover; border-radius: 2px; background: var(--rule); display: block; }
img.pic-thumb { background: #fff; } /* transparent parts on white, as they are read */
.pic-text { display: grid; gap: 1px; min-width: 0; }
.pic-name { font-size: 15px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pic-what { font-size: 14px; line-height: 1.45; color: var(--ink-2); }
.pic-content { font-size: 13px; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.picture.waiting .pic-what, .picture.reading .pic-what { color: var(--ink-3); }
.picture.reading .pic-thumb { animation: breathe 1.6s ease-in-out infinite; }
@keyframes breathe { 50% { opacity: 0.45; } }
@media (prefers-reduced-motion: reduce) { .picture.reading .pic-thumb { animation: none; } }
.picture.failed .pic-n { background: var(--ink-3); }
.pic-x {
  font: inherit; font-size: 20px; line-height: 1; color: var(--ink-3); background: none; border: 0;
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer;
}
.pic-x:hover { color: var(--ink); }
.picture.lit .pic-name { text-decoration: underline; text-decoration-color: var(--ink-3); text-underline-offset: 3px; }
.pictures-end { display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: baseline; margin: 12px 0 0; font-size: 13px; color: var(--ink-3); }

/* details */
.more { margin-top: 24px; }
.more + .more { margin-top: 18px; }
.more summary {
  cursor: pointer; display: inline-block; font-size: 15px; color: var(--ink-2); list-style: none;
  border-bottom: 1px solid var(--rule); padding-bottom: 2px;
}
.more summary::-webkit-details-marker { display: none; }
.more summary::after { content: " +"; color: var(--ink-3); }
.more[open] summary::after { content: " −"; }
.more summary:hover { color: var(--ink); }
.more-body { padding-top: 20px; }
.method p, .method li { color: var(--ink-2); font-size: 15px; max-width: 46em; }
.method h3 { margin: 28px 0 6px; font-size: 16px; font-weight: 600; }
.method ul { padding-left: 18px; margin: 6px 0; }
.method a { color: var(--ink); text-decoration-color: var(--ink-3); }
.footer { padding-bottom: 8px; padding-top: 32px; }

.button:focus-visible, .linklike:focus-visible, .more summary:focus-visible, .pic-main:focus-visible, .pic-x:focus-visible,
.range:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.tooltip {
  position: fixed; z-index: 20; pointer-events: none; background: var(--surface); color: var(--ink);
  border: 1px solid var(--rule); border-radius: 6px; padding: 7px 10px; font-size: 13px; line-height: 1.35;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.10); max-width: 280px;
}
.tooltip .v { font-weight: 600; }
.tooltip .k { color: var(--ink-2); }

/* dropping pictures anywhere on the page */
.drop {
  position: fixed; inset: 12px; z-index: 30; pointer-events: none; display: grid; place-items: center;
  border: 2px dashed var(--ink-3); border-radius: 14px; background: color-mix(in srgb, var(--surface) 90%, transparent);
}
.drop[hidden] { display: none; }
.drop p { margin: 0; font-size: 22px; font-weight: 600; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .page { padding: 36px 16px 56px; }
  .lede { font-size: 18px; }
  .add-note { flex-basis: 100%; }
  .block { padding-top: 40px; }
  .specimen { scroll-margin-top: 16px; }
  .picture.chosen { box-shadow: -8px 0 0 var(--tint), 8px 0 0 var(--tint); }
  .pic-main { grid-template-columns: 20px 44px minmax(0, 1fr); gap: 12px; }
  .pic-thumb { width: 44px; height: 44px; }
}
@media (pointer: coarse) { .pic-x { width: 44px; height: 44px; } }
@media print {
  .range, .add, .pic-x, .linklike, .tooltip, .drop { display: none !important; }
}