@font-face { font-family: 'KFuture'; src: url('fonts/KenneyFuture.ttf') format('truetype'); font-display: swap; }

:root {
  --bg: #fbfaf7;
  --card: #ffffff;
  --ink: #1f2330;
  --muted: #5d6475;
  --line: #e4e1da;
  --off: #c94b4b;
  --off-bg: #fbe9e7;
  --on: #2c8a57;
  --on-bg: #e3f4ea;
  --accent: #3a5bd9;
  --screen: #1b1e2a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171e; --card: #1d2029; --ink: #e9eaf0; --muted: #a2a8b8; --line: #2f3340;
    --off: #ff7f7f; --off-bg: #3a2023; --on: #6fd69c; --on-bg: #1b3326; --accent: #8ea6ff; --screen: #0d0f15;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
#app { max-width: 720px; margin: 0 auto; padding: 16px 12px 32px; }

h1, h2 { font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; font-weight: 750; letter-spacing: -.01em; line-height: 1.2; }
h1 { font-size: 28px; margin: 4px 0 8px; }
h2 { font-size: 19px; margin: 0 0 4px; }
.intro p { margin: 0 0 10px; color: var(--muted); }
.toc { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 4px; }
.toc a {
  font-size: 13px; text-decoration: none; color: var(--accent); border: 1px solid var(--line);
  background: var(--card); border-radius: 999px; padding: 3px 10px;
}
.toc a:hover { border-color: var(--accent); }

.demo {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 12px 12px; margin: 18px 0; scroll-margin-top: 12px;
}
.demo.flash { animation: flash 1.2s ease-out; }
@keyframes flash { from { box-shadow: 0 0 0 4px var(--accent); } to { box-shadow: 0 0 0 0 transparent; } }
.num {
  display: inline-block; min-width: 24px; height: 24px; line-height: 24px; text-align: center; border-radius: 6px;
  background: var(--ink); color: var(--card); font-size: 14px; margin-right: 4px; vertical-align: 1px;
}
.blurb { margin: 2px 0 12px; color: var(--muted); font-size: 14px; }

.pair { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.side { min-width: 0; display: flex; flex-direction: column; }
.side-head { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-bottom: 5px; }
.tag {
  display: inline-block; font-family: 'KFuture', system-ui, sans-serif; font-size: 12px; text-transform: uppercase;
  letter-spacing: .06em; padding: 2px 8px; border-radius: 6px;
}
.tag.off { color: var(--off); background: var(--off-bg); }
.tag.on { color: var(--on); background: var(--on-bg); }
.switch { font: 11px/1.2 ui-monospace, Menlo, monospace; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.screen {
  position: relative; aspect-ratio: 16 / 9; background: var(--screen); border-radius: 8px; overflow: hidden;
  cursor: pointer; touch-action: manipulation; -webkit-tap-highlight-color: transparent; user-select: none; -webkit-user-select: none;
}
.screen canvas { display: block; width: 100%; height: 100%; }
.side.playing .screen { outline: 3px solid var(--accent); outline-offset: 2px; }
.side[data-side="L"] .screen { box-shadow: inset 0 0 0 2px var(--off-bg); }

.meter {
  margin-top: 6px; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line);
}
.side[data-side="L"] .meter { background: var(--off-bg); border-color: transparent; }
.side[data-side="R"] .meter { background: var(--on-bg); border-color: transparent; }
.m-row { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.m-label { font: 11px 'KFuture', system-ui, sans-serif; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.m-val { font: 22px/1 ui-monospace, 'SF Mono', Menlo, Consolas, monospace; font-weight: 700; font-variant-numeric: tabular-nums; }
.side[data-side="L"] .m-val { color: var(--off); }
.side[data-side="R"] .m-val { color: var(--on); }
.meter.counting .m-val { animation: tick .5s steps(2) infinite; }
@keyframes tick { 50% { opacity: .6; } }
.m-sub { font: 12px/1.4 ui-monospace, 'SF Mono', Menlo, Consolas, monospace; color: var(--muted); margin-top: 4px; min-height: 1.4em; }
.m-sub b { color: var(--ink); font-weight: 600; }
.m-sub b.coins { font-size: 14px; color: #b8860b; }
@media (prefers-color-scheme: dark) { .m-sub b.coins { color: #ffd34d; } }

.say { margin: 6px 2px 0; font-size: 13px; min-height: 2.9em; line-height: 1.45; }

.start-btn {
  position: absolute; inset: 0; margin: auto; width: max-content; height: max-content; z-index: 2;
  font: 16px 'KFuture', system-ui, sans-serif; padding: 12px 18px; border-radius: 10px; border: 0;
  background: var(--accent); color: #fff; cursor: pointer; box-shadow: 0 4px 20px rgba(0,0,0,.3);
}

.controls { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.controls button {
  font: 13px system-ui, sans-serif; padding: 6px 12px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink); min-height: 34px;
}
.controls button:hover { border-color: var(--accent); }
.controls button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.controls .replay { font-weight: 600; }
.controls .hint { font-size: 12px; color: var(--muted); align-self: center; margin-left: 2px; }

.summary {
  margin: 10px 0 0; padding: 8px 10px; border-left: 3px solid var(--accent); background: var(--bg);
  border-radius: 0 8px 8px 0; font-size: 14px; min-height: 2.6em;
}
.summary.pending { color: var(--muted); }

.foot { color: var(--muted); font-size: 13px; }
.foot a { color: var(--accent); }
kbd {
  font: 12px ui-monospace, Menlo, monospace; padding: 1px 5px; border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 4px; background: var(--card);
}
.unknown { padding: 16px; border: 1px dashed var(--line); border-radius: 8px; }

/* Phones: stack the two sides so each stays big enough to read */
@media (max-width: 540px) {
  #app { padding: 10px 8px 24px; }
  h1 { font-size: 21px; }
  .demo { padding: 12px 10px 10px; border-radius: 10px; }
  .pair { grid-template-columns: 1fr; gap: 12px; }
  .say { min-height: 0; margin-top: 4px; font-size: 12.5px; }
  .meter { padding: 4px 8px; margin-top: 4px; }
  .m-val { font-size: 18px; }
  .m-sub { margin-top: 2px; font-size: 11px; }
  .side-head { margin-bottom: 3px; }
  .blurb { font-size: 13.5px; }
}

/* ?trick=<id>&solo : one demo, no page chrome (for embedding) */
body.solo #app { padding: 6px; }
body.solo .intro, body.solo .foot { display: none; }
body.solo .demo { margin: 0; }