/* Remote Shutter: an instant camera, in two halves.
   Plastic body for the start screen, pebbled leatherette for the live
   screens, the five-colour stripe as the mark, and one red shutter. */

@font-face {
  font-family: 'Jost';
  src: url('../fonts/jost-latin-wght.woff2') format('woff2-variations'),
       url('../fonts/jost-latin-wght.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@property --iris {
  syntax: '<length>';
  inherits: false;
  initial-value: 0px;
}

:root {
  --plastic: #E7E4D8;
  --plastic-edge: #D4D0C1;
  --leather: #2B2926;
  --leather-hi: #36332F;
  --ink: #1D1C1A;
  --ink-soft: #5E5A52;
  --paper: #FBFAF6;
  --shutter: #E2412B;
  --shutter-deep: #B8301E;
  --s-red: #E2412B;
  --s-orange: #F28C28;
  --s-yellow: #F6C531;
  --s-green: #4DA35A;
  --s-blue: #2F7FC1;
  --on-dark: #F3F0E6;
  --on-dark-soft: #B9B3A6;
  --focus: #F6C531;

  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);

  --stripe: linear-gradient(90deg,
    var(--s-red) 0 20%, var(--s-orange) 20% 40%, var(--s-yellow) 40% 60%,
    var(--s-green) 60% 80%, var(--s-blue) 80% 100%);
  --leather-texture:
    radial-gradient(circle at 30% 30%, rgb(255 255 255 / 0.045) 0.8px, transparent 1.3px) 0 0 / 5px 5px,
    radial-gradient(circle at 70% 70%, rgb(0 0 0 / 0.22) 0.9px, transparent 1.4px) 2px 3px / 7px 6px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* The black-bodied model of the same camera. */
    --plastic: #24221F;
    --plastic-edge: #3A3732;
    --ink: #F1EDE2;
    --ink-soft: #ABA597;
    color-scheme: dark;
  }
  .role-camera { box-shadow: 0 3px 0 #141311, inset 0 0 0 1.5px rgb(243 240 230 / 0.18); }
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  /* Jost has no CJK glyphs, so Chinese falls through to the system's own
     Simplified Chinese face, glyph by glyph. */
  font-family: 'Jost', 'PingFang SC', 'Hiragino Sans GB', 'Noto Sans CJK SC', 'Source Han Sans SC',
    'Microsoft YaHei', ui-rounded, 'Avenir Next', 'Segoe UI', system-ui, sans-serif;
  font-weight: 450;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink);
  background: var(--plastic);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
  touch-action: manipulation;
}

body:not([data-screen="home"]) {
  background: var(--leather);
  color: var(--on-dark);
}

[hidden] { display: none !important; }

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

button:disabled { cursor: default; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

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

.screen {
  min-height: 100%;
  min-height: 100dvh;
  padding: calc(var(--safe-t) + 12px) calc(var(--safe-r) + 16px) calc(var(--safe-b) + 24px) calc(var(--safe-l) + 16px);
}

.screen-dark {
  background: var(--leather-texture), var(--leather);
}

/* ================================================================= home */

.screen-home {
  display: flex;
  flex-direction: column;
  max-width: 34rem;
  margin: 0 auto;
  padding-top: 0;
}

.home-head {
  position: relative;
  padding-bottom: 28px;
}

.lang-btn {
  position: absolute;
  right: 0;
  top: calc(var(--safe-t) + 35px + 4px);
  min-height: 36px;
  padding: 4px 14px;
  border: 1.5px solid var(--ink-soft);
  border-radius: 999px;
  background: none;
  color: var(--ink);
  font-size: 15px;
  font-weight: 550;
}

.stripe {
  display: grid;
  grid-template-rows: repeat(5, 7px);
  margin: 0 calc(-16px - var(--safe-r)) 28px calc(-16px - var(--safe-l));
  padding-top: var(--safe-t);
}
.stripe i:nth-child(1) { background: var(--s-red); }
.stripe i:nth-child(2) { background: var(--s-orange); }
.stripe i:nth-child(3) { background: var(--s-yellow); }
.stripe i:nth-child(4) { background: var(--s-green); }
.stripe i:nth-child(5) { background: var(--s-blue); }

.wordmark {
  margin: 0;
  font-weight: 800;
  font-size: clamp(44px, 15vw, 76px);
  line-height: 0.88;
  letter-spacing: -0.035em;
  text-transform: lowercase;
  max-width: 6ch;
}

:lang(zh-Hans) .wordmark {
  max-width: none;
  font-size: clamp(44px, 14vw, 72px);
  line-height: 1.05;
  letter-spacing: 0.04em;
}

.tagline {
  margin: 16px 0 0;
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink-soft);
  max-width: 24ch;
}

.roles {
  display: grid;
  gap: 12px;
}

.role {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 18px 18px 18px 16px;
  border: 0;
  border-radius: 22px;
  text-align: left;
  box-shadow: 0 2px 0 var(--plastic-edge), inset 0 1px 0 rgb(255 255 255 / 0.08);
  transition: transform 80ms ease;
}
.role:active { transform: translateY(2px); box-shadow: 0 0 0 var(--plastic-edge); }

.role-camera {
  background: var(--leather-texture), var(--leather);
  color: var(--on-dark);
  box-shadow: 0 3px 0 #141311;
}
.role-camera:active { box-shadow: 0 1px 0 #141311; }

.role-viewer {
  background: var(--paper);
  color: #1D1C1A;
  box-shadow: 0 3px 0 var(--plastic-edge), inset 0 0 0 2px #1D1C1A;
}

.role-glyph {
  flex: none;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 16px;
}
.role-camera .role-glyph { background: #1F1D1B; }
.role-viewer .role-glyph { background: #ECE9DF; }

.lens {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 38% 36%, rgb(255 255 255 / 0.7) 0 2.5px, transparent 3px),
    radial-gradient(circle, #2A3D4E 0 8px, #0E0D0C 8.5px 11px, #5A5650 11.5px 13px, #0E0D0C 13.5px);
}

.screen-glyph {
  width: 24px;
  height: 38px;
  border-radius: 6px;
  border: 3px solid #1D1C1A;
  background: var(--stripe);
  background-size: 100% 6px;
  background-repeat: no-repeat;
  background-position: 0 70%;
}

.role-text { display: grid; gap: 2px; }
.role-name { font-weight: 650; font-size: 19px; line-height: 1.2; }
.role-hint { font-size: 15px; opacity: 0.72; line-height: 1.3; }

.how-note {
  margin: 32px 0 0;
  font-size: 15px;
  color: var(--ink-soft);
}

.how {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 10px;
  font-size: 15px;
  color: var(--ink-soft);
}
.how li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: baseline;
}
.how strong { font-weight: 600; color: var(--ink); }
.how li::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  font-weight: 650;
  font-size: 13px;
  transform: translateY(-1px);
}

.app-qr {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: center;
  margin-top: 16px;
  padding: 12px 16px 12px 12px;
  border-radius: 22px;
  box-shadow: inset 0 0 0 1.5px var(--plastic-edge);
}
.app-qr-code {
  width: 124px;
  height: 124px;
  padding: 4px;
  border-radius: 12px;
  background: #fff;
}
.app-qr-code .qr {
  display: block;
  width: 100%;
  height: 100%;
}
.app-qr-text p {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.4;
  color: var(--ink-soft);
}
.app-qr-title {
  margin: 0;
  font-weight: 650;
  font-size: 17px;
  line-height: 1.25;
}

.fine {
  margin: 28px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ============================================================ bars */

.bar, .live-top {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
}

.bar-title {
  font-weight: 650;
  font-size: 18px;
}

.step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  font-size: 14px;
  color: var(--on-dark-soft);
  white-space: nowrap;
}
.pips {
  display: inline-flex;
  gap: 4px;
}
.pips i {
  width: 14px;
  height: 5px;
  border-radius: 3px;
  background: rgb(243 240 230 / 0.22);
}
.pips i.done { background: rgb(243 240 230 / 0.6); }
.pips i.now { background: var(--s-yellow); }

/* Numbered instructions on the pairing screens; numbers match across both
   phones (and the start screen's list) so you can follow along. */
.step-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  max-width: 21rem;
  list-style: none;
  text-align: left;
  color: var(--on-dark-soft);
}
.step-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
}
.step-list li::before { content: attr(data-step); }
.step-list li::before, .step-num {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--paper);
  color: #1D1C1A;
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
}
.step-list li::before { margin-top: -2px; }
.step-list strong { color: var(--on-dark); font-weight: 600; }

.icon-btn {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-left: -6px;
  border: 0;
  border-radius: 50%;
  background: rgb(255 255 255 / 0.08);
}
.icon-btn svg, .deck-btn svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.text-btn {
  margin-left: auto;
  padding: 10px 4px;
  border: 0;
  background: none;
  color: var(--on-dark-soft);
  font-size: 15px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 10px;
  border-radius: 999px;
  background: rgb(0 0 0 / 0.45);
  font-size: 14px;
  font-weight: 550;
  color: var(--on-dark);
}
.status .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--s-yellow);
}
.status[data-state="live"] .dot { background: #5BD46B; box-shadow: 0 0 0 3px rgb(91 212 107 / 0.25); }
.status[data-state="warn"] .dot { background: var(--s-orange); animation: blink 1s steps(2) infinite; }
.status[data-state="lost"] .dot { background: var(--s-red); }
@keyframes blink { 50% { opacity: 0.25; } }

/* ============================================================ buttons */

.btn {
  display: block;
  width: 100%;
  max-width: 22rem;
  min-height: 54px;
  padding: 14px 20px;
  border: 0;
  border-radius: 999px;
  font-weight: 650;
  font-size: 18px;
  text-align: center;
  transition: transform 80ms ease, opacity 150ms ease;
}
.btn:active:not(:disabled) { transform: translateY(2px); }
.btn:disabled { opacity: 0.45; }

.btn-primary {
  background: var(--paper);
  color: #1D1C1A;
  box-shadow: 0 3px 0 #141311;
}
.btn-quiet {
  background: transparent;
  color: var(--on-dark);
  box-shadow: inset 0 0 0 2px rgb(243 240 230 / 0.35);
}

/* ============================================================ pairing */

.pair-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  max-width: 26rem;
  margin: 0 auto;
  padding-top: 12px;
  text-align: center;
}

.pair-heading {
  margin: 8px 0 0;
  font-weight: 750;
  font-size: 30px;
  line-height: 1.1;
  letter-spacing: -0.015em;
}

.pair-instructions {
  margin: 0;
  max-width: 30ch;
  color: var(--on-dark-soft);
}
.pair-instructions strong { color: var(--on-dark); font-weight: 600; }

/* The QR code sits in an instant print: thin sides, deep bottom. */
.print {
  width: min(84vw, 50vh, 380px);
  padding: 14px 14px 0;
  background: var(--paper);
  border-radius: 3px;
  box-shadow: 0 1px 0 rgb(255 255 255 / 0.5) inset, 0 14px 30px rgb(0 0 0 / 0.45);
}
.print-image {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  background: #fff;
}
.print-image .qr {
  display: block;
  width: 100%;
  height: 100%;
}
.print-caption {
  margin: 0;
  padding: 14px 4px 18px;
  color: #3A3732;
  font-weight: 550;
  font-size: 16px;
}

.spinner {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: conic-gradient(var(--s-red), var(--s-orange), var(--s-yellow), var(--s-green), var(--s-blue), var(--s-red));
  mask: radial-gradient(circle, transparent 15px, #000 16px);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(1turn); } }

.intro-art {
  position: relative;
  width: 210px;
  height: 120px;
  margin-top: 20px;
}
.intro-art .phone-a, .intro-art .phone-b {
  position: absolute;
  bottom: 0;
  width: 58px;
  height: 104px;
  border-radius: 12px;
  border: 3px solid var(--on-dark);
}
.intro-art .phone-a { left: 0; transform: rotate(-8deg); }
.intro-art .phone-a::after {
  content: '';
  position: absolute;
  top: 10px;
  left: 50%;
  width: 14px;
  height: 14px;
  margin-left: -7px;
  border-radius: 50%;
  border: 3px solid var(--on-dark);
}
.intro-art .phone-b { right: 0; transform: rotate(8deg); background: var(--stripe); background-size: 100% 10px; background-repeat: no-repeat; background-position: 0 60%; }
.intro-art .beam {
  position: absolute;
  left: 64px;
  right: 64px;
  top: 52px;
  height: 3px;
  background: repeating-linear-gradient(90deg, var(--on-dark-soft) 0 6px, transparent 6px 12px);
}

/* ============================================================ camera video */

/* The camera role's one <video>, placed per screen. Off-screen but still
   playing when not shown, so captures and scans always have frames. */
.cam-video {
  position: fixed;
  right: 0;
  bottom: 0;
  width: 2px;
  height: 2px;
  opacity: 0;
  pointer-events: none;
  object-fit: cover;
  background: #000;
}
.cam-video.mirror { transform: scaleX(-1); }

body[data-screen="camera-scan"] .cam-video {
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 1;
  transform: none; /* scanning: never mirrored, it confuses aiming */
}

:root { --cam-h: min(56vh, calc((100vw - 32px) * 1.33)); }

body[data-screen="camera-live"] .cam-video {
  top: calc(var(--safe-t) + 72px);
  left: calc(var(--safe-l) + 16px);
  bottom: auto;
  /* A video's auto width is its intrinsic width, so set it explicitly. */
  width: calc(100% - var(--safe-l) - var(--safe-r) - 32px);
  height: var(--cam-h);
  opacity: 1;
  object-fit: contain;
  border-radius: 20px;
  z-index: 1;
}

/* ============================================================ scan screens */

.screen-scan {
  position: fixed;
  inset: 0;
  background: transparent;
  z-index: 2;
}
.screen-scan .bar { position: relative; z-index: 3; }
.screen-scan .bar .icon-btn { background: rgb(0 0 0 / 0.45); }
.screen-scan .step { color: var(--on-dark); text-shadow: 0 1px 3px #000; }

.scan-video {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
}

.scan-frame {
  position: fixed;
  left: 50%;
  top: 50%;
  width: min(72vw, 58vh);
  aspect-ratio: 1;
  transform: translate(-50%, -54%);
  border-radius: 28px;
  box-shadow: 0 0 0 200vmax rgb(0 0 0 / 0.45);
  z-index: 2;
}
.scan-frame::before, .scan-frame::after, .scan-frame span::before, .scan-frame span::after {
  content: '';
  position: absolute;
  width: 44px;
  height: 44px;
  border: 5px solid var(--paper);
}
.scan-frame::before { top: 0; left: 0; border-right: 0; border-bottom: 0; border-top-left-radius: 28px; }
.scan-frame::after { top: 0; right: 0; border-left: 0; border-bottom: 0; border-top-right-radius: 28px; }
.scan-frame span::before { bottom: 0; left: 0; border-right: 0; border-top: 0; border-bottom-left-radius: 28px; }
.scan-frame span::after { bottom: 0; right: 0; border-left: 0; border-top: 0; border-bottom-right-radius: 28px; }

.scan-hint .step-num { flex: none; }
.scan-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: calc(var(--safe-b) + 36px);
  margin: 0 auto;
  max-width: 22rem;
  padding: 12px 18px;
  border-radius: 18px;
  background: rgb(20 19 17 / 0.82);
  text-align: center;
  font-weight: 550;
  z-index: 3;
}

/* ============================================================ camera live */

.camera-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding-top: 12px;
}
.camera-window {
  width: 100%;
  height: var(--cam-h);
  border-radius: 20px;
  background: #000;
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 0.06);
}
.camera-note {
  margin: 0;
  color: var(--on-dark-soft);
  text-align: center;
  max-width: 30ch;
}

.btn-save {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--paper);
  color: #1D1C1A;
  box-shadow: 0 3px 0 #141311;
  padding: 8px 22px 8px 8px;
}
.save-thumb {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  background: #D9D5C8;
  flex: none;
}
.save-thumb img, .last-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Big countdown on the camera phone, for the people in the shot. */
.camera-count {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 40;
  pointer-events: none;
  font-weight: 800;
  font-size: min(70vw, 60vh);
  line-height: 1;
  color: #fff;
  background: rgb(226 65 43 / 0.82);
  font-variant-numeric: tabular-nums;
}
.camera-count.pulse { animation: count-pulse 1s ease-out; }
@keyframes count-pulse {
  0% { background-color: rgb(255 255 255 / 0.95); color: var(--shutter); transform: scale(1); }
  25% { background-color: rgb(226 65 43 / 0.82); color: #fff; }
}

.flash {
  position: fixed;
  inset: 0;
  background: #fff;
  opacity: 0;
  pointer-events: none;
  z-index: 50;
}
.flash.go { animation: flash 450ms ease-out; }
@keyframes flash { 0% { opacity: 1; } 100% { opacity: 0; } }

/* ============================================================ viewer live */

.screen-live {
  position: fixed;
  inset: 0;
  padding: 0;
  background: #000;
  overflow: hidden;
}

.stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  --box-w: 100vw;
  --box-h: 100vh;
  --rot: 0deg;
}
.remote-video {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--box-w);
  height: var(--box-h);
  object-fit: contain;
  transform: translate(-50%, -50%) rotate(var(--rot));
  transition: transform 220ms ease;
}
.stage.mirror .remote-video { transform: translate(-50%, -50%) scaleX(-1) rotate(var(--rot)); }

/* Iris: closes and opens when the camera fires. */
.stage::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, transparent var(--iris), #000 calc(var(--iris) + 1px));
  --iris: 120vmax;
  opacity: 0;
}
.stage.snap::after { animation: iris 340ms ease-in-out; }
@keyframes iris {
  0% { --iris: 120vmax; opacity: 1; }
  45% { --iris: 0px; opacity: 1; }
  100% { --iris: 120vmax; opacity: 1; }
}

.tap-to-play {
  position: absolute;
  left: 50%;
  top: 45%;
  transform: translate(-50%, -50%);
  padding: 16px 24px;
  border: 0;
  border-radius: 999px;
  background: var(--paper);
  color: #1D1C1A;
  font-weight: 650;
  z-index: 5;
}

.live-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  justify-content: space-between;
  padding: calc(var(--safe-t) + 10px) calc(var(--safe-r) + 14px) 28px calc(var(--safe-l) + 14px);
  background: linear-gradient(rgb(0 0 0 / 0.55), transparent);
  z-index: 4;
}
.live-top .icon-btn { margin: 0; background: rgb(0 0 0 / 0.45); }

.zoom {
  position: absolute;
  left: 50%;
  bottom: calc(var(--safe-b) + 132px);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  width: min(80vw, 22rem);
  padding: 8px 16px;
  border-radius: 999px;
  background: rgb(20 19 17 / 0.7);
  z-index: 4;
}
.zoom input {
  flex: 1;
  accent-color: var(--s-yellow);
  height: 32px;
}
.zoom output {
  min-width: 3.4em;
  text-align: right;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.countdown {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  z-index: 3;
  font-weight: 800;
  font-size: min(50vw, 40vh);
  line-height: 1;
  color: #fff;
  text-shadow: 0 4px 30px rgb(0 0 0 / 0.6);
  font-variant-numeric: tabular-nums;
}
.countdown.pulse { animation: digit 1s ease-out; }
@keyframes digit {
  0% { transform: scale(1.35); opacity: 0; }
  18% { transform: scale(1); opacity: 1; }
  80% { opacity: 1; }
  100% { opacity: 0.35; }
}

.deck {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr) auto repeat(2, 1fr);
  align-items: center;
  justify-items: center;
  padding: 14px calc(var(--safe-r) + 8px) calc(var(--safe-b) + 14px) calc(var(--safe-l) + 8px);
  background: var(--leather-texture), rgb(43 41 38 / 0.9);
  border-top: 5px solid transparent;
  border-image: var(--stripe) 1;
  z-index: 4;
}

.deck-btn {
  display: grid;
  justify-items: center;
  gap: 3px;
  min-width: 56px;
  padding: 6px 4px;
  border: 0;
  background: none;
  color: var(--on-dark);
}
.deck-btn:disabled { opacity: 0.4; }
.deck-btn.unavailable { visibility: hidden; } /* keeps the shutter centred */
.deck-btn.on { color: var(--s-yellow); }
.deck-label {
  font-size: 12px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.last-thumb {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  overflow: hidden;
  background: rgb(255 255 255 / 0.12);
  box-shadow: inset 0 0 0 2px rgb(255 255 255 / 0.5);
}

/* The one red thing. */
.shutter {
  position: relative;
  width: 84px;
  height: 84px;
  margin: 0 6px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: 0 4px 0 #141311;
  transition: transform 70ms ease, box-shadow 70ms ease;
}
.shutter span {
  position: absolute;
  inset: 7px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 32%, #F2654F, var(--shutter) 55%, var(--shutter-deep));
  box-shadow: inset 0 -3px 0 rgb(0 0 0 / 0.18);
  transition: inset 120ms ease, border-radius 120ms ease;
}
.shutter:active:not(:disabled) { transform: translateY(3px); box-shadow: 0 1px 0 #141311; }
.shutter:disabled span { background: #6C665D; }
.shutter.cancel span { inset: 26px; border-radius: 6px; }

/* ============================================================ review */

.review {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: calc(var(--safe-t) + 20px) 16px calc(var(--safe-b) + 20px);
  background: rgb(26 25 23 / 0.86);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow-y: auto;
}

.polaroid {
  margin: 0;
  padding: 14px 14px 0;
  background: var(--paper);
  border-radius: 3px;
  box-shadow: 0 18px 40px rgb(0 0 0 / 0.55);
  animation: eject 420ms cubic-bezier(.2, .8, .3, 1.1);
}
@keyframes eject {
  from { transform: translateY(40px); opacity: 0; }
}

.polaroid-image {
  /* Sized from the photo's aspect ratio (set from photoStart), so the
     frame has the right shape while the photo is still arriving. */
  --ar: 1.3333;
  width: min(calc(88vw - 28px), 28rem, calc(56vh * var(--ar)), calc(56dvh * var(--ar)));
  aspect-ratio: var(--ar);
  background: #33434B;
}
.polaroid-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.polaroid.developing .polaroid-image img { visibility: hidden; }
.polaroid.developed .polaroid-image img { animation: develop 2.6s ease-out; }
@keyframes develop {
  0% { filter: brightness(0.35) sepia(0.7) hue-rotate(150deg) saturate(0.35) contrast(0.7) blur(3px); }
  45% { filter: brightness(0.8) sepia(0.35) hue-rotate(40deg) saturate(0.7) contrast(0.85) blur(0.5px); }
  100% { filter: none; }
}

.polaroid-strip {
  display: grid;
  gap: 10px;
  padding: 14px 4px 18px;
  color: #3A3732;
}
.develop-bar {
  display: block;
  height: 5px;
  border-radius: 3px;
  background: #E5E1D5;
  overflow: hidden;
}
.develop-bar span {
  display: block;
  height: 100%;
  background: var(--stripe);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 120ms linear;
}
.polaroid.developed .develop-bar { opacity: 0; transition: opacity 600ms 400ms; }
.polaroid-caption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-weight: 550;
  font-size: 16px;
}
#review-size {
  color: #8A847A;
  font-variant-numeric: tabular-nums;
}

.review-actions {
  display: grid;
  gap: 10px;
  width: min(88vw, 22rem);
  justify-items: center;
}

/* ============================================================ sheet, toast */

.sheet {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 16px 16px calc(var(--safe-b) + 16px);
  background: rgb(0 0 0 / 0.45);
}
.sheet-card {
  width: 100%;
  max-width: 28rem;
  padding: 22px 20px 20px;
  border-radius: 26px;
  background: var(--paper);
  color: #1D1C1A;
  box-shadow: 0 -2px 0 var(--s-yellow) inset, 0 20px 50px rgb(0 0 0 / 0.5);
  animation: sheet-up 260ms cubic-bezier(.2, .8, .3, 1);
}
@keyframes sheet-up { from { transform: translateY(30px); opacity: 0; } }
.sheet-card h2 {
  margin: 0 0 6px;
  font-weight: 750;
  font-size: 24px;
  line-height: 1.15;
}
.sheet-card p { margin: 0 0 10px; color: #4A4640; }
.sheet-hint {
  padding: 12px 14px;
  border-radius: 14px;
  background: #F4EFD9;
  border-left: 5px solid var(--s-orange);
  color: #1D1C1A !important;
}
.sheet-actions {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}
.sheet-actions .btn { max-width: none; }
.sheet .btn-primary { background: #1D1C1A; color: var(--paper); box-shadow: none; }
.sheet .btn-quiet { color: #1D1C1A; box-shadow: inset 0 0 0 2px rgb(29 28 26 / 0.3); }

.toast {
  position: fixed;
  left: 50%;
  top: calc(var(--safe-t) + 70px);
  transform: translateX(-50%);
  width: max-content;
  max-width: calc(100vw - 32px);
  padding: 11px 18px;
  border-radius: 16px;
  background: var(--paper);
  color: #1D1C1A;
  font-weight: 550;
  font-size: 15px;
  text-align: center;
  box-shadow: 0 8px 24px rgb(0 0 0 / 0.35);
  z-index: 60;
}

/* ============================================================ larger screens */

@media (min-width: 700px) {
  .screen-home { padding-top: 0; justify-content: center; }
  .roles { grid-template-columns: 1fr 1fr; }
  .role { flex-direction: column; align-items: flex-start; padding: 22px; }
}

@media (orientation: landscape) and (max-height: 520px) {
  :root { --cam-h: calc(100vh - 150px); }
  .print { width: min(70vh, 300px); }
  .pair-body { padding-top: 0; gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
  .stage.snap::after { animation: none; }
}