/* Darkroom proof sheet: paper, ink, and one grease-pencil red. */
:root {
  --bg: #EFE9DD;
  --surface: #F8F4EA;
  --ink: #1E1B18;
  --muted: #645B52;
  --line: #CFC6B5;
  --accent: #B5301A;
  --accent-soft: #F1D9CF;
  --film: #26221E;
  --display: "Young Serif", Georgia, serif;
  --body: "Hanken Grotesk", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.55 var(--body);
  /* paper grain */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .12 0 0 0 0 .1 0 0 0 0 .08 0 0 0 .11 0'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)'/%3E%3C/svg%3E");
}
.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }
a { color: var(--ink); text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

/* Masthead: a strip of film */
.masthead {
  background: var(--film);
  color: #F3EDE1;
  padding: 44px 0 40px;
  border-block: 14px solid var(--film);
  background-image:
    repeating-linear-gradient(90deg, transparent 0 22px, #F3EDE1 22px 36px, transparent 36px 44px);
  background-size: 44px 8px;
  background-repeat: repeat-x;
  background-position: 0 0;
  position: relative;
}
.masthead::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 8px;
  background: repeating-linear-gradient(90deg, transparent 0 22px, #F3EDE1 22px 36px, transparent 36px 44px);
}
.masthead a { color: #F3EDE1; }
.masthead a:hover { color: #fff; }
.eyebrow { font: 500 13px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: #E9B9A9; margin: 0 0 14px; }
h1 { font: 400 clamp(2rem, 5.2vw, 3.3rem)/1.08 var(--display); letter-spacing: -.01em; margin: 0 0 16px; max-width: 16em; }
.lede { margin: 0; max-width: 62ch; color: #DDD5C6; }

/* Caveat */
.caveat {
  margin: 32px 0 8px;
  padding: 18px 22px 20px;
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: 3px;
  transform: rotate(-.35deg);
  position: relative;
}
.caveat .stamp {
  position: absolute; top: -17px; right: 18px; margin: 0; padding: 6px 12px 5px;
  font: 500 13px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); background: var(--surface); border: 2px solid var(--accent); border-radius: 2px;
  box-shadow: inset 0 0 0 2px var(--surface), inset 0 0 0 3px var(--accent);
  transform: rotate(4deg);
}
.caveat p { margin: 0; font-size: 15.5px; }
.caveat .caveat-tag { font: 500 13px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }

/* Steps */
.step, .results, .method { margin-top: 48px; }
h2 { font: 400 1.6rem/1.2 var(--display); margin: 0 0 6px; display: flex; align-items: center; gap: 12px; }
.frame-no {
  font: 500 13px/1 var(--mono); color: var(--bg); background: var(--ink);
  min-width: 26px; height: 26px; display: inline-grid; place-items: center; border-radius: 2px;
}
.hint { margin: 0 0 18px; color: var(--muted); max-width: 64ch; }

.tabs { display: inline-flex; border: 1.5px solid var(--ink); border-radius: 3px; overflow: hidden; margin-bottom: 16px; }
.tab {
  font: 600 15px/1 var(--body); padding: 11px 16px; background: transparent; color: var(--ink);
  border: 0; cursor: pointer;
}
.tab + .tab { border-left: 1.5px solid var(--ink); }
.tab[aria-selected="true"] { background: var(--ink); color: var(--bg); }

.source-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 24px; align-items: start; }

.dropzone {
  display: grid; justify-items: center; gap: 8px; text-align: center;
  padding: 44px 20px; min-height: 280px; align-content: center;
  border: 2px dashed var(--muted); border-radius: 3px; background: var(--surface);
  cursor: pointer; transition: background .2s var(--ease), border-color .2s var(--ease);
}
.dropzone:hover, .dropzone.is-over, .dropzone:focus-within { background: var(--accent-soft); border-color: var(--accent); }
.dz-main { font-weight: 600; }
.dz-sub { font: 400 13px/1 var(--mono); color: var(--muted); }

.viewfinder {
  position: relative; background: var(--film); border-radius: 3px; overflow: hidden;
  aspect-ratio: 4 / 3; display: grid; place-items: center;
}
.viewfinder video { width: 100%; height: 100%; object-fit: cover; transform: scaleX(-1); display: block; }
.vf-guide { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; fill: none; stroke: #F3EDE1; stroke-width: 2; opacity: .8; }
.vf-guide ellipse { stroke-dasharray: 6 7; }
.cam-msg { position: absolute; margin: 0; padding: 0 20px; text-align: center; color: #DDD5C6; font: 400 14px/1.4 var(--mono); }
.cam-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }

.btn {
  font: 600 15px/1 var(--body); padding: 12px 18px; border-radius: 3px; cursor: pointer;
  background: transparent; color: var(--ink); border: 1.5px solid var(--ink);
  transition: transform .15s var(--ease), background .15s var(--ease);
}
.btn:hover:not(:disabled) { transform: translateY(-1px); background: var(--surface); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: #9C2815; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-big { font-size: 17px; padding: 16px 26px; }
.btn-small { font-size: 14px; padding: 9px 13px; }

/* A photographic print */
.print { margin: 0; background: #fff; padding: 10px 10px 0; border: 1px solid var(--line); box-shadow: 0 6px 18px rgb(30 27 24 / .12); transform: rotate(.6deg); }
.print-img { position: relative; background: var(--film); aspect-ratio: 1; display: grid; place-items: center; overflow: hidden; }
.print-img canvas { width: 100%; height: 100%; object-fit: contain; display: block; }
.print-empty { margin: 0; color: #A69C8E; font: 400 13px/1 var(--mono); }
.print figcaption { font: 400 12.5px/1.35 var(--mono); color: var(--muted); padding: 9px 2px 10px; }
.print-small { width: 190px; flex: none; transform: rotate(-1deg); }
.print { transition: transform .25s var(--ease); }
.print.is-cropping { transform: none; }
.print-actions { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 2px 12px; }
.develop { animation: develop 1.6s var(--ease) both; }
@keyframes develop { from { opacity: 0; filter: sepia(1) blur(5px) brightness(1.6); } to { opacity: 1; filter: none; } }

/* Cropper */
.cropper { position: absolute; overflow: hidden; touch-action: none; user-select: none; -webkit-user-select: none; }
.crop-box {
  position: absolute; cursor: move; touch-action: none;
  border: 1.5px solid #fff; box-shadow: 0 0 0 9999px rgb(20 17 14 / .62);
}
.crop-box:focus-visible { outline: 3px solid var(--accent); outline-offset: -5px; }
.crop-handle { position: absolute; width: 22px; height: 22px; border: 0 solid #fff; }
.crop-handle::after { content: ""; position: absolute; inset: -12px; }
.crop-handle[data-h="nw"] { left: -2px; top: -2px; border-width: 5px 0 0 5px; cursor: nwse-resize; }
.crop-handle[data-h="ne"] { right: -2px; top: -2px; border-width: 5px 5px 0 0; cursor: nesw-resize; }
.crop-handle[data-h="sw"] { left: -2px; bottom: -2px; border-width: 0 0 5px 5px; cursor: nesw-resize; }
.crop-handle[data-h="se"] { right: -2px; bottom: -2px; border-width: 0 5px 5px 0; cursor: nwse-resize; }

.choice { display: flex; flex-wrap: wrap; gap: 12px; }
.choice-opt { position: relative; cursor: pointer; }
.choice-opt input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.choice-opt span {
  display: block; padding: 13px 20px; font-weight: 600; border: 1.5px solid var(--ink); border-radius: 3px;
  transition: background .15s var(--ease);
}
.choice-opt input:checked + span { background: var(--ink); color: var(--bg); }
.choice-opt input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 3px; }

.run { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 14px; }
.run-note { margin: 0; color: var(--muted); }
.progress { margin-top: 18px; max-width: 560px; }
.progress-track { height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; width: 100%; background: var(--accent); transform-origin: left; transform: scaleX(0); transition: transform .25s linear; }
.progress-label { font: 400 13.5px/1.4 var(--mono); color: var(--muted); margin: 8px 0 0; }
.error { margin: 16px 0 0; padding: 12px 16px; background: var(--accent-soft); border-left: 4px solid var(--accent); max-width: 64ch; }

/* Results */
.results-head { display: flex; gap: 28px; align-items: flex-start; margin: 16px 0 26px; }
.results-how p { margin: 0 0 12px; max-width: 58ch; }
.results-reminder { color: var(--accent); font-weight: 600; }

/* Summary: a strip of film holding the five "winning" composites */
.strip {
  --holes: repeating-linear-gradient(90deg, transparent 0 14px, #F3EDE1 14px 26px, transparent 26px 32px);
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px;
  background: var(--holes) 0 9px / 32px 7px repeat-x, var(--holes) 0 calc(100% - 9px) / 32px 7px repeat-x, var(--film);
  padding: 30px 14px; border-radius: 2px;
}
.strip-frame { margin: 0; opacity: 0; transform: translateY(8px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
.strip.is-drawn .strip-frame { opacity: 1; transform: none; }
.strip-frame:nth-child(2) { transition-delay: 70ms; } .strip-frame:nth-child(3) { transition-delay: 140ms; }
.strip-frame:nth-child(4) { transition-delay: 210ms; } .strip-frame:nth-child(5) { transition-delay: 280ms; }
.strip-frame img { width: 100%; height: auto; aspect-ratio: 1; object-fit: cover; display: block; }
.strip-frame figcaption { color: #F3EDE1; font: 600 14px/1.25 var(--body); padding-top: 8px; }
.strip-no { display: block; font: 500 11.5px/1 var(--mono); letter-spacing: .1em; color: #E9B9A9; margin-bottom: 4px; }
.sub { font: 500 13px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 34px 0 12px; }

.traits { border-top: 2px solid var(--ink); }
.trait { padding: 20px 0 22px; border-bottom: 1px solid var(--line); opacity: 0; transform: translateY(10px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
.is-drawn .trait { opacity: 1; transform: none; }
.trait-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 16px; margin-bottom: 14px; }
.trait-name { font: 500 13px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); flex-basis: 100%; }
.trait-verdict { font: 400 1.55rem/1.15 var(--display); }
.trait-diff { font: 400 14px/1.2 var(--mono); color: var(--muted); font-variant-numeric: tabular-nums; }

.trait-body { display: grid; grid-template-columns: 96px minmax(0, 1fr) 96px; gap: 18px; align-items: center; }
.pole { margin: 0; text-align: center; }
.pole-frame { position: relative; width: 84px; margin: 0 auto 10px; }
.pole img { width: 84px; height: 84px; object-fit: cover; display: block; border: 4px solid #fff; outline: 1px solid var(--line); border-radius: 1px; }
/* grease-pencil ring around the closer composite */
.ring { position: absolute; inset: -13px; width: calc(100% + 26px); height: calc(100% + 26px); overflow: visible; pointer-events: none; }
.ring path { fill: none; stroke: var(--accent); stroke-width: 3.5; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset .8s var(--ease) .55s; }
.is-drawn .ring path { stroke-dashoffset: 0; }
.pole-label { font: 600 13px/1.25 var(--body); display: block; }
.pole-sim { font: 400 12.5px/1.3 var(--mono); color: var(--muted); font-variant-numeric: tabular-nums; display: block; margin-top: 2px; }
.pole.is-winner .pole-label { color: var(--accent); }

.gap { position: relative; height: 56px; }
.gap-track { position: absolute; left: 0; right: 0; top: 18px; height: 20px; background: var(--surface); border: 1px solid var(--line); }
.gap-zero { position: absolute; left: 50%; top: 10px; height: 36px; width: 2px; margin-left: -1px; background: var(--ink); }
.gap-bar { position: absolute; top: 19px; height: 18px; background: var(--ink); transform: scaleX(0); transition: transform .9s var(--ease); }
.gap-bar.to-hi { left: 50%; transform-origin: left; }
.gap-bar.to-lo { right: 50%; transform-origin: right; }
.is-drawn .gap-bar { transform: scaleX(1); }
/* the value sits in the empty half of the track, next to the zero line */
.gap-value { position: absolute; left: 50%; top: 22px; font: 500 12.5px/1 var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.gap-value.to-hi { transform: translateX(calc(-100% - 8px)); }
.gap-value.to-lo { transform: translateX(8px); }
.axis-note { font: 400 12.5px/1.4 var(--mono); color: var(--muted); margin: 12px 0 0; }

/* Method */
.method { border-top: 2px solid var(--ink); padding-top: 26px; }
.method-list { padding-left: 1.2em; max-width: 66ch; }
.method-list li { margin-bottom: 8px; }
.method-foot { color: var(--muted); max-width: 66ch; }
.footer { margin-top: 44px; padding-bottom: 44px; color: var(--muted); font-size: 13.5px; }

@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .source-grid { grid-template-columns: 1fr; }
  .print { max-width: 300px; }
  .print.is-cropping { max-width: none; }
  .strip { grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: 112px; overflow-x: auto; }
  .caveat .stamp { right: 10px; font-size: 12px; }
  .dropzone { min-height: 200px; padding: 30px 16px; }
  .results-head { flex-direction: column; gap: 16px; }
  .trait-body { grid-template-columns: 1fr 1fr; gap: 12px 16px; }
  .trait-body .gap { grid-column: 1 / -1; grid-row: 2; }
  .trait-body .pole-lo { grid-column: 1; grid-row: 1; }
  .trait-body .pole-hi { grid-column: 2; grid-row: 1; }
  .tab { padding: 11px 12px; font-size: 14.5px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .caveat, .print, .print-small { transform: none; }
}