/* The darkroom: a print on the Frontier's neutral surround, the roll below it, and a panel that
   explains every control as it goes. Same drafting-sheet language as the 3D scan: warm paper,
   hairlines, mono capitals, one signal orange. */

:root {
  --paper: #f5f5ef;
  --paper-2: #ecebe3;
  --ink: #282828;
  --ink-2: #414140;
  --ink-3: #626260;
  --ink-4: #8a8a86;
  --line: #c9c9c3;
  --line-2: #dedcd4;
  --brand: #fa3600;
  --brand-ink: #d42f00;
  --brand-soft: rgba(250, 54, 0, .08);
  --surround: #767676;               /* ~18 % grey: the Frontier's neutral surround */
  --key-c: #3fb0bf; --key-m: #d2599c; --key-y: #e4be2e;
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .16 0 0 0 0 .16 0 0 0 0 .16 0 0 0 .08 0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23g)'/%3E%3C/svg%3E");
  --font: "BT Grotesk", "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  --mono: "Geist Mono", "SF Mono", ui-monospace, SFMono-Regular, Menlo, "Roboto Mono", monospace;
  --ease: cubic-bezier(.4, 0, .2, 1);
  --panel-w: 384px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--paper) var(--grain); color: var(--ink); font: 400 14px/1.5 var(--font); letter-spacing: -.005em; -webkit-font-smoothing: antialiased; overflow: hidden; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }
h1, h2, h3, p { margin: 0; }
kbd { display: inline-block; min-width: 17px; padding: 1px 4px; margin: 0 1px; font: 500 10px/1.3 var(--mono); text-align: center; color: var(--ink-3); border: 1px solid var(--line); }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--brand-ink); outline-offset: 2px; }
.grow { flex: 1; }

/* ---------------------------------------------------------------- buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 34px; padding: 0 14px; border: 1px solid var(--line); background: transparent; font: 500 11.5px/1 var(--mono); letter-spacing: .04em; text-transform: uppercase; white-space: nowrap; transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), transform .12s var(--ease); user-select: none; }
.btn:hover { border-color: var(--ink); background: rgba(40, 40, 40, .04); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--brand-ink); border-color: var(--brand-ink); color: #fff; }
.btn.primary:hover { background: var(--ink); border-color: var(--ink); }
.btn.ghost { border-color: transparent; }
.btn.ghost:hover { border-color: var(--line); }
.btn.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.icon-btn { width: 32px; height: 32px; border: 1px solid transparent; background: transparent; font-size: 22px; line-height: 1; color: var(--ink-2); transition: border-color .2s; }
.icon-btn:hover { border-color: var(--line); }

/* while the roll loads (only if it takes a moment): gone once the scan or the editor is up */
.boot-note { position: fixed; inset: 0; display: grid; place-items: center; margin: 0; font: 500 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); pointer-events: none; animation: boot-in .6s var(--ease) .6s both; transition: opacity .5s; }
@keyframes boot-in { from { opacity: 0; } to { opacity: 1; } }
body:has(.s3d.in) .boot-note, body:has(#app[data-state="ready"]) .boot-note { opacity: 0; animation: none; }

/* ---------------------------------------------------------------- layout */
.app { display: grid; height: 100dvh; grid-template-columns: minmax(0, 1fr) var(--panel-w); grid-template-rows: 56px minmax(0, 1fr); opacity: 0; transition: opacity .8s var(--ease); }
.app[data-state="ready"] { opacity: 1; }
.top { grid-column: 1 / -1; display: flex; align-items: center; gap: 16px; padding: 0 16px; border-bottom: 1px solid var(--line); background: rgba(245, 245, 239, .86); backdrop-filter: blur(8px); z-index: 5; }
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; flex: 1; }
.logo { width: 22px; height: 22px; flex: none; color: var(--ink); }
.wordmark { font: 600 19px/1 var(--font); letter-spacing: -.03em; }
.roll { font: 500 11px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); padding-left: 12px; border-left: 1px solid var(--line); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav { display: flex; align-items: center; gap: 6px; }
.fno { display: inline-flex; align-items: baseline; gap: 5px; min-width: 64px; justify-content: center; }
.fno b { font: 600 20px/1 var(--font); letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.fno span { font: 500 11px/1 var(--mono); color: var(--ink-3); }
.top-right { display: flex; align-items: center; gap: 6px; flex: 1; justify-content: flex-end; }

.stage { grid-column: 1; grid-row: 2; display: grid; grid-template-rows: minmax(0, 1fr) 118px; min-height: 0; }
.viewer { position: relative; display: grid; grid-template-rows: minmax(0, 1fr) auto; min-height: 0; background: var(--surround); }
.surround { position: relative; display: flex; align-items: center; justify-content: center; min-height: 0; padding: 28px; container-type: size; }
.frame { position: relative; aspect-ratio: var(--ar, 1.5); width: min(100cqw - 56px, (100cqh - 56px) * var(--ar, 1.5)); box-shadow: 0 1px 2px rgba(0, 0, 0, .28), 0 10px 30px rgba(0, 0, 0, .2); background: #6b6b6b; transition: aspect-ratio .5s var(--ease); }
.frame img { position: absolute; inset: 0; width: 100%; height: 100%; display: block; user-select: none; -webkit-user-drag: none; }
.frame .layer { opacity: 0; transition: opacity .35s var(--ease); pointer-events: none; }
.frame .layer.show { opacity: 1; }
.frame .layer.instant { transition: none; }
.tag { position: absolute; left: 12px; top: 12px; padding: 5px 9px; font: 500 10.5px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--paper); background: rgba(20, 20, 20, .72); }
.developing { position: absolute; right: 16px; top: 14px; display: inline-flex; align-items: center; gap: 8px; font: 500 10.5px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: rgba(255, 255, 255, .85); opacity: 0; transition: opacity .25s var(--ease); }
.developing i { width: 8px; height: 8px; background: var(--brand); box-shadow: 0 0 10px var(--brand); animation: blink 1s steps(2, jump-none) infinite; }
.developing.on { opacity: 1; }
@keyframes blink { 50% { opacity: .25; } }
.vbar { display: flex; align-items: center; gap: 8px; padding: 8px 16px 10px; color: rgba(255, 255, 255, .8); }
.vbar .btn { color: #fff; border-color: rgba(255, 255, 255, .35); }
.vbar .btn:hover { border-color: #fff; background: rgba(255, 255, 255, .08); }
.vbar .btn.ghost { border-color: transparent; }
.vbar .btn.held { background: #fff; color: var(--ink); }
.keyhint { margin-left: auto; font: 400 11px/1.2 var(--mono); color: rgba(255, 255, 255, .62); }
.keyhint kbd { color: rgba(255, 255, 255, .8); border-color: rgba(255, 255, 255, .3); }

/* crop */
.crop { position: absolute; inset: 0; cursor: crosshair; overflow: hidden; }
.crop-rect { position: absolute; box-shadow: 0 0 0 9999px rgba(30, 30, 30, .55); outline: 1px solid #fff; cursor: move; }
.crop-rect i { position: absolute; width: 16px; height: 16px; background: #fff; border: 1px solid var(--ink); }
.crop-rect i[data-h="nw"] { left: -1px; top: -1px; cursor: nwse-resize; } .crop-rect i[data-h="se"] { right: -1px; bottom: -1px; cursor: nwse-resize; }
.crop-rect i[data-h="ne"] { right: -1px; top: -1px; cursor: nesw-resize; } .crop-rect i[data-h="sw"] { left: -1px; bottom: -1px; cursor: nesw-resize; }
.crop-rect i[data-h="n"], .crop-rect i[data-h="s"] { left: calc(50% - 12px); width: 24px; height: 8px; cursor: ns-resize; }
.crop-rect i[data-h="n"] { top: -1px; } .crop-rect i[data-h="s"] { bottom: -1px; }
.crop-rect i[data-h="e"], .crop-rect i[data-h="w"] { top: calc(50% - 12px); width: 8px; height: 24px; cursor: ew-resize; }
.crop-rect i[data-h="e"] { right: -1px; } .crop-rect i[data-h="w"] { left: -1px; }
.frame.cropped .crop { cursor: default; }
.frame.cropped .crop-rect { outline-color: rgba(255, 255, 255, .45); cursor: default; box-shadow: 0 0 0 9999px rgba(118, 118, 118, .92); }
.frame.cropped .crop-rect i { display: none; }
.cropbar { display: flex; align-items: center; gap: 8px; padding: 8px 16px 10px; background: var(--ink); color: var(--paper); }
.cropbar .btn { color: var(--paper); border-color: rgba(255, 255, 255, .3); }
.cropbar .btn.primary { background: var(--brand-ink); border-color: var(--brand-ink); }
.cb-l { font: 500 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; margin-right: 6px; }
.cropbar .seg { display: flex; }
.cropbar .seg button { height: 30px; padding: 0 10px; border: 1px solid rgba(255, 255, 255, .25); margin-left: -1px; background: transparent; font: 500 11px/1 var(--mono); color: var(--paper); }
.cropbar .seg button.on { background: var(--paper); color: var(--ink); }

/* the roll */
.strip { display: flex; gap: 10px; align-items: center; padding: 12px 16px; overflow-x: auto; background: #2b2b2a; scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: #555 transparent; }
.thumb { position: relative; flex: none; height: 82px; aspect-ratio: 1.5; padding: 0; border: 0; background: #444 center / cover no-repeat; outline: 2px solid transparent; outline-offset: 3px; transition: outline-color .2s var(--ease), transform .25s var(--ease), opacity .3s; opacity: .78; }
.thumb:hover { opacity: 1; transform: translateY(-2px); }
.thumb.cur { outline-color: var(--brand); opacity: 1; }
.thumb span { position: absolute; left: 0; bottom: -1px; transform: translateY(100%); padding-top: 3px; font: 500 9.5px/1 var(--mono); color: rgba(255, 255, 255, .55); }
.thumb.edited::after { content: ""; position: absolute; right: 4px; top: 4px; width: 7px; height: 7px; background: var(--brand); box-shadow: 0 0 0 2px rgba(0, 0, 0, .35); }

/* ---------------------------------------------------------------- the panel */
.panel { grid-column: 2; grid-row: 2; overflow-y: auto; border-left: 1px solid var(--line); background: var(--paper) var(--grain); scroll-behavior: smooth; }
.sec { padding: 18px 20px 20px; border-bottom: 1px solid var(--line-2); }
.sec-h { display: flex; align-items: baseline; gap: 10px; }
.sec-h h3 { font: 600 17px/1.2 var(--font); letter-spacing: -.02em; }
.sec-h .machine { font: 500 10px/1 var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--ink-4); }
.sec-h .q { margin-left: auto; width: 24px; height: 24px; border: 1px solid var(--line); border-radius: 50%; background: transparent; font: 600 12px/1 var(--font); color: var(--ink-3); transition: border-color .2s, color .2s, background .2s; }
.sec-h .q:hover { border-color: var(--brand-ink); color: var(--brand-ink); background: var(--brand-soft); }
.sec .lead { margin-top: 6px; color: var(--ink-2); font-size: 13.5px; }
.sec .body { margin-top: 14px; display: grid; gap: 12px; }
.sec.flash { animation: flash 1.1s var(--ease); }
@keyframes flash { 0% { background: var(--brand-soft); } 100% { background: transparent; } }

/* a balance: two ends, a track of steps, the value */
.bal { display: grid; grid-template-columns: 76px 1fr 76px; align-items: center; gap: 10px; }
.bal .end { height: 34px; border: 1px solid var(--line); background: transparent; font: 500 12px/1 var(--font); color: var(--ink-2); transition: border-color .15s, background .15s, transform .1s; display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
.bal .end:hover { border-color: var(--ink); }
.bal .end:active { transform: scale(.97); background: rgba(40, 40, 40, .06); }
.bal .end .sw { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.track { position: relative; height: 34px; cursor: pointer; touch-action: none; }
.track .rail { position: absolute; left: 0; right: 0; top: 16px; height: 2px; background: var(--rail, var(--line)); }
.track .tick { position: absolute; top: 12px; width: 1px; height: 10px; background: var(--line); }
.track .tick.mid { top: 9px; height: 16px; background: var(--ink-4); }
.track .knob { position: absolute; top: 7px; width: 20px; height: 20px; margin-left: -10px; background: var(--paper); border: 2px solid var(--ink); border-radius: 50%; transition: left .18s var(--ease), border-color .2s; box-shadow: 0 1px 3px rgba(0, 0, 0, .2); }
.track.moved .knob { border-color: var(--brand-ink); }
.track .knob b { position: absolute; left: 50%; top: -18px; transform: translateX(-50%); font: 600 10.5px/1 var(--mono); color: var(--ink-2); white-space: nowrap; }
.readout { display: flex; justify-content: space-between; margin-top: -2px; font: 400 11px/1.3 var(--mono); color: var(--ink-3); }
.readout .say { color: var(--ink-2); font-family: var(--font); font-size: 12.5px; }

/* the colour wheel: where the cast moves */
.wheel-row { display: grid; grid-template-columns: 92px 1fr; gap: 16px; align-items: center; }
.wheel { position: relative; width: 92px; height: 92px; border-radius: 50%; background: conic-gradient(from 90deg, #e05048, #e4be2e, #6fbf5a, #3fb0bf, #4a6fd0, #d2599c, #e05048); box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .12); }
.wheel::after { content: ""; position: absolute; inset: 0; border-radius: 50%; background: radial-gradient(closest-side, #f5f5ef 0%, rgba(245, 245, 239, .85) 40%, rgba(245, 245, 239, 0) 100%); }
.wheel i { position: absolute; left: 50%; top: 50%; width: 12px; height: 12px; margin: -6px 0 0 -6px; border-radius: 50%; background: var(--ink); border: 2px solid #fff; z-index: 1; transition: transform .25s var(--ease); }
.wheel .wl { position: absolute; z-index: 1; font: 600 9px/1 var(--mono); color: rgba(0, 0, 0, .55); }
.colour-rows { display: grid; gap: 12px; }

/* choices */
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { height: 32px; padding: 0 12px; border: 1px solid var(--line); background: transparent; font: 500 12.5px/1 var(--font); color: var(--ink-2); transition: all .18s var(--ease); display: inline-flex; align-items: center; gap: 7px; }
.chip:hover { border-color: var(--ink); }
.chip.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.chip .sw { width: 12px; height: 12px; border-radius: 50%; }
.grad { display: grid; grid-template-columns: 82px 1fr 1fr; gap: 6px; align-items: center; }
.grad .lab { font: 500 10.5px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.grad .chip { justify-content: center; }
.grad .std { grid-column: 1 / -1; }
.toggle { position: relative; display: inline-flex; align-items: center; gap: 10px; font-size: 13px; cursor: pointer; }
.toggle input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }   /* kept inside the label: focusing it must not scroll the page */
.toggle i { position: relative; width: 36px; height: 20px; border-radius: 10px; background: var(--line); transition: background .2s; }
.toggle i::after { content: ""; position: absolute; left: 2px; top: 2px; width: 16px; height: 16px; border-radius: 50%; background: #fff; box-shadow: 0 1px 2px rgba(0, 0, 0, .25); transition: transform .2s var(--ease); }
.toggle input:checked + i { background: var(--brand-ink); }
.toggle input:checked + i::after { transform: translateX(16px); }
.toggle input:focus-visible + i { outline: 2px solid var(--brand-ink); outline-offset: 2px; }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tools { display: flex; gap: 6px; flex-wrap: wrap; }
.tools .chip { min-width: 84px; justify-content: center; }
.slider { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center; }
.slider input[type="range"] { width: 100%; accent-color: var(--brand-ink); }
.slider output { font: 600 12px/1 var(--mono); min-width: 28px; text-align: right; }
details.adv > summary { cursor: pointer; list-style: none; display: flex; align-items: baseline; gap: 10px; }
details.adv > summary::-webkit-details-marker { display: none; }
details.adv > summary h3::after { content: " +"; color: var(--ink-4); }
details.adv[open] > summary h3::after { content: " −"; }
.kv { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; font-size: 13px; }
.kv dt { color: var(--ink-3); }
.kv dd { margin: 0; font: 500 12px/1.4 var(--mono); }
.panel-foot { padding: 18px 20px 28px; font: 400 11.5px/1.5 var(--mono); color: var(--ink-4); }

/* ---------------------------------------------------------------- the guide */
.coach { position: fixed; inset: 0; z-index: 900; }
.coach-hole { position: fixed; border-radius: 2px; box-shadow: 0 0 0 9999px rgba(20, 20, 20, .58); outline: 2px solid var(--brand); outline-offset: 4px; transition: left .55s var(--ease), top .55s var(--ease), width .55s var(--ease), height .55s var(--ease); pointer-events: none; }
.coach.passthrough { pointer-events: none; }
.coach-card { position: fixed; width: min(360px, calc(100vw - 32px)); padding: 18px 18px 14px; background: var(--paper); border: 1px solid var(--ink); box-shadow: 0 7px 0 -2px var(--ink), 0 20px 50px rgba(0, 0, 0, .3); transition: left .55s var(--ease), top .55s var(--ease), opacity .3s; pointer-events: auto; }
.coach-step { font: 500 10.5px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--brand-ink); }
.coach-card h3 { margin-top: 8px; font: 600 19px/1.2 var(--font); letter-spacing: -.02em; }
.coach-card p { margin-top: 6px; color: var(--ink-2); }
.coach-act { display: flex; gap: 6px; align-items: center; margin-top: 14px; }
.coach-card .try { display: inline-block; margin-top: 10px; padding: 4px 8px; font: 500 10.5px/1.2 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--brand-ink); background: var(--brand-soft); }
.coach-card .try.done { color: #2c7a3c; background: rgba(44, 122, 60, .1); }

/* ---------------------------------------------------------------- sheets */
dialog.sheet { width: min(560px, calc(100vw - 24px)); max-height: calc(100dvh - 48px); padding: 0; border: 1px solid var(--ink); background: var(--paper); color: var(--ink); box-shadow: 0 7px 0 -2px var(--ink), 0 30px 80px rgba(0, 0, 0, .35); overflow: auto; }
dialog.sheet.wide { width: min(860px, calc(100vw - 24px)); }
dialog.sheet[open] { animation: sheet-in .45s var(--ease); }
dialog.sheet::backdrop { background: rgba(20, 20, 20, .45); animation: fade-in .45s var(--ease); }
@keyframes sheet-in { from { opacity: 0; transform: translateY(14px); } }
@keyframes fade-in { from { opacity: 0; } }
.sheet-h { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; padding: 20px 22px 14px; border-bottom: 1px solid var(--line-2); }
.sheet-h h2 { font: 600 24px/1.15 var(--font); letter-spacing: -.03em; }
.eyebrow { font: 500 10.5px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--brand-ink); margin-bottom: 6px; }
.sheet-b { padding: 18px 22px 22px; display: grid; gap: 12px; color: var(--ink-2); }
.sheet-b .lead { font-size: 16px; color: var(--ink); }
.sheet-f { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }
.how { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0; border: 1px solid var(--line); }
.how li { padding: 14px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); margin: 0 -1px -1px 0; }
.how .n { font: 500 10.5px/1 var(--mono); color: var(--brand-ink); letter-spacing: .08em; }
.how h4 { margin: 8px 0 6px; font: 600 15px/1.2 var(--font); letter-spacing: -.01em; color: var(--ink); }
.how p { font-size: 12.5px; }
.how .fact { margin-top: 8px; font: 400 10.5px/1.4 var(--mono); color: var(--ink-4); }

/* ---------------------------------------------------------------- toasts */
.toasts { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); display: grid; gap: 8px; z-index: 950; }
.toast { padding: 10px 14px; background: var(--ink); color: var(--paper); font: 500 13px/1.3 var(--font); box-shadow: 0 10px 30px rgba(0, 0, 0, .3); animation: toast-in .35s var(--ease); }
.toast.out { opacity: 0; transform: translateY(8px); transition: all .3s var(--ease); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } }

/* ---------------------------------------------------------------- small screens */
@media (max-width: 1180px) {
  .keyhint { display: none; }
}
@media (max-width: 900px) {
  body { overflow: auto; }
  .app { height: auto; min-height: 100dvh; grid-template-columns: minmax(0, 1fr); grid-template-rows: 52px auto auto; }
  .top { position: sticky; top: 0; gap: 8px; padding: 0 10px; }
  .roll, .keyhint, #howBtn { display: none; }
  .wordmark { font-size: 16px; }
  .top-right .btn { padding: 0 9px; }
  .stage { grid-row: 2; grid-template-rows: auto 96px; }
  .surround { height: 56vh; padding: 14px; }
  .frame { width: min(100cqw - 28px, (100cqh - 28px) * var(--ar, 1.5)); }
  .panel { grid-column: 1; grid-row: 3; border-left: 0; overflow: visible; }
  .thumb { height: 64px; }
  .bal { grid-template-columns: 64px 1fr 64px; }
}
@media (max-width: 560px) {
  .wordmark, .long { display: none; }
  .fno { min-width: 52px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}