:root {
  --paper: #f3efe6;
  --ink: #1c1b18;
  --mute: #1c1b1866;
  --accent: #d8432b;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --beat: 560ms;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161512;
    --ink: #ece7db;
    --mute: #ece7db66;
    --accent: #ee6a50;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  display: grid;
  grid-template-columns: minmax(0, 880px);
  grid-template-rows: auto 1fr auto;
  justify-content: center;
  min-height: 100dvh;
  padding: 0 clamp(16px, 4vw, 40px);
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

button:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; border-radius: 2px; }
button:disabled { cursor: default; }

/* header */
header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 24px 0 0;
  gap: 16px;
}
h1 { margin: 0; font-size: 15px; font-weight: 400; font-style: italic; letter-spacing: 0.02em; }
nav { display: flex; gap: 20px; }

.link {
  font-size: 15px;
  font-style: italic;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--mute);
}
.link:hover { text-decoration-color: var(--ink); }
.link[aria-pressed="false"] { opacity: 0.55; }

/* stage */
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 0;
}

.stage {
  width: 100%;
  max-width: min(100%, 880px);
  height: auto;
  max-height: 54dvh;
  overflow: visible;
}

.stage * { vector-effect: non-scaling-stroke; }
.stage path, .stage circle {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* hands: PNG sprites, black outline on transparent. The #hand-ink SVG filter repaints them in --ink,
   so they follow light and dark mode in every browser (Safari ignores CSS filters on SVG images). */
.stage .ink-flood { flood-color: var(--ink); }
.hand .pose { opacity: 0; transition: opacity 140ms ease; }
.hand[data-pose="rock"] .pose.rock,
.hand[data-pose="paper"] .pose.paper,
.hand[data-pose="scissors"] .pose.scissors { opacity: 1; }

/* The hand idles with a slow, slightly different drift each side so the two are never in lockstep. */
.float { animation: drift 3.4s ease-in-out infinite alternate; }
.cpu .float { animation-duration: 4.1s; animation-delay: -1.3s; }
@keyframes drift {
  from { transform: translateY(0) rotate(-1deg); }
  to   { transform: translateY(-5px) rotate(1deg); }
}

.bob {
  transform-box: fill-box;
  transform-origin: 50% 90%;
  transform: translateY(-26px);
  transition: transform 260ms cubic-bezier(.2, .9, .25, 1.2), opacity 240ms ease;
}
.hand[data-thrown="true"] .bob { transform: translateY(-38px); }
.hand[data-lost="true"] .bob { opacity: 0.3; transform: translateY(-30px) rotate(5deg); }

/* beat rule: four ticks and one travelling dot */
.beat .ticks { fill: none; stroke: var(--mute); stroke-width: 2; }
.beat .dot {
  fill: var(--accent);
  stroke: none;
  transform: translateX(0);
  opacity: 0.25;
  transition: transform calc(var(--beat) * 0.35) cubic-bezier(.3, 0, .2, 1), opacity 160ms ease;
}
.beat .dot[data-tick="0"] { transform: translateX(0); }
.beat .dot[data-tick="1"] { transform: translateX(40px); }
.beat .dot[data-tick="2"] { transform: translateX(80px); }
.beat .dot[data-tick="3"] { transform: translateX(120px); }
.beat .dot[data-live="true"] { opacity: 1; }

/* winner mark */
.mark {
  fill: none !important;
  stroke: var(--accent) !important;
  stroke-width: 3 !important;
  transform-box: fill-box;
  transform-origin: center;
  transform: scaleX(0);
  transition: transform 260ms cubic-bezier(.2, .8, .2, 1);
}
.mark[data-on="true"] { transform: scaleX(1); }

/* caption */
.caption {
  margin: 0;
  min-height: 2.6em;
  max-width: 34ch;
  text-align: center;
  font-size: clamp(18px, 3.2vw, 24px);
  line-height: 1.3;
  font-style: italic;
  text-wrap: balance;
}

.caption button { font-size: inherit; font-style: italic; text-decoration: underline; text-underline-offset: 6px; text-decoration-thickness: 1px; }
.caption button .dot-inline {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 10px;
  vertical-align: middle;
  animation: breathe 1.8s ease-in-out infinite;
}
@keyframes breathe { 50% { transform: scale(0.55); opacity: 0.5; } }

/* controls */
.controls {
  display: flex;
  gap: clamp(20px, 7vw, 56px);
  margin-top: 8px;
  transition: opacity 200ms ease;
}
.pick {
  font-size: clamp(24px, 5vw, 34px);
  position: relative;
  padding: 6px 0;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 8px;
  text-decoration-color: transparent;
}
.pick kbd {
  font: 11px/1 ui-monospace, "SF Mono", Menlo, monospace;
  color: var(--mute);
  vertical-align: super;
  margin-left: 4px;
}
.pick:hover:not(:disabled) { text-decoration-color: var(--ink); }
.pick[aria-pressed="true"] { text-decoration-color: var(--ink); text-decoration-thickness: 2px; }

body[data-state="idle"] .controls,
body[data-state="tutorial"] .controls,
body[data-state="busy"] .pick:not([aria-pressed="true"]),
body[data-state="over"] .controls { opacity: 0.25; pointer-events: none; }

/* score */
footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  padding: 0 0 clamp(20px, 4vh, 36px);
  gap: 16px;
}
.score { display: grid; grid-template-columns: auto auto; column-gap: 14px; align-items: end; justify-content: start; }
.score.right { grid-column: 3; justify-content: end; text-align: right; }
.score .who { grid-column: 1 / -1; font-size: 14px; font-style: italic; margin-bottom: 2px; }
.score .n { font-size: clamp(56px, 12vw, 96px); line-height: 0.9; font-variant-numeric: lining-nums tabular-nums; }
.score.right .n { order: 2; }
.score.right .pips { order: 1; }
.pips { display: flex; gap: 5px; align-items: flex-end; padding-bottom: 6px; }
.pips i { width: 2px; height: 18px; background: var(--ink); opacity: 0.18; transition: opacity 200ms ease, transform 200ms ease; transform-origin: bottom; }
.pips i[data-on="true"] { opacity: 1; }
#again { grid-column: 2; font-size: 22px; align-self: center; }

@media (max-width: 520px) {
  .stage { max-height: 44dvh; }
  .controls { gap: 18px; }
  .pick kbd { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .bob, .mark, .beat .dot, .controls, .pips i { transition: none; }
  .float { animation: none; }
  .caption button .dot-inline { animation: none; }
}