:root {
  color-scheme: dark;
  --floor: #151a2e;      /* the page */
  --lane: #1f2640;       /* the lane */
  --ink: #e7ebf5;        /* text and plain beats */
  --muted: #98a2b8;
  --you: #5b82ff;        /* your squad */
  --ghost: #ff6b8a;      /* the ghost squad */
  --strong: #ffb020;     /* strong beats */
  --line: #3a4361;
  --font: "Avenir Next", "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { background: var(--floor); color: var(--ink); font-family: var(--font); }
body { margin: 0 auto; max-width: 760px; padding: 20px 16px 40px; }
a { color: var(--you); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--you); outline-offset: 3px; }

.top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 20px; }
.mark { font-weight: 800; font-size: 1.25rem; letter-spacing: -0.02em; }
.version { margin-left: 8px; font-size: 0.85rem; font-weight: 500; color: var(--muted); }
.date { color: var(--muted); font-variant-numeric: tabular-nums; }

/* the lane: your squad on the left, the ghost's on the right */
.arena {
  display: grid; grid-template-columns: 1fr 2px 1fr; gap: 16px; align-items: stretch;
  background: var(--lane); border-radius: 20px; padding: 20px 16px; min-height: 260px;
}
.mid { background: repeating-linear-gradient(to bottom, var(--line) 0 10px, transparent 10px 20px); }
.team { margin: 0 0 12px; font-size: 0.9rem; color: var(--muted); }
.ghost .team { text-align: right; }
.units { display: flex; flex-direction: column; gap: 14px; }
.ghost .units { align-items: flex-end; }
.unit { display: flex; align-items: center; gap: 10px; }
.ghost .unit { flex-direction: row-reverse; }
.unit span { font-size: 0.95rem; }
.token { width: 44px; height: 44px; flex: none; transition: transform 90ms ease-out; }
.you .token { color: var(--you); }
.ghost .token { color: var(--ghost); opacity: 0.8; }
.token svg { width: 100%; height: 100%; display: block; overflow: visible; }
.arena.hit .token { transform: scale(1.08); }
/* an enemy winding up; a parried attack */
.ghost .unit.winding .token { transform: translateX(-10px) scale(1.12); opacity: 1; }
.arena.parried .ghost .token { transform: translateX(8px); }
.arena.parried .you .token svg { filter: drop-shadow(0 0 8px var(--ink)); }
/* a perfect or good tap: your squad crits */
.arena.crit .you .token { transform: scale(1.18); }
.arena.crit .you .token svg { filter: drop-shadow(0 0 8px var(--strong)); }

/* the beat */
.beat { margin-top: 28px; }
.beat-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
h1 { font-size: clamp(1.6rem, 5vw, 2.2rem); font-weight: 800; letter-spacing: -0.03em; margin: 0; }
.bpm { margin: 0; color: var(--muted); font-variant-numeric: tabular-nums; }
.bpm span { color: var(--ink); font-weight: 700; font-size: 1.3rem; }
.bpm .style { font-weight: 600; font-size: 1rem; color: var(--strong); margin-right: 6px; }

/* the drums: a step grid per measure, 8 eighths wide, rows hat / snare / kick. Beat 4 (the last two columns) is the
   player's: no drums there, and the clap they play is marked in amber. */
.track { list-style: none; margin: 18px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px 14px; }
.track li { display: grid; grid-template-columns: repeat(8, 1fr); grid-template-rows: repeat(4, 18px); gap: 4px; }
.track .step { border-radius: 4px; background: var(--lane); }
.track .step.yours { background: transparent; }
.track .step.on.kick { background: var(--ink); }
.track .step.on.snare { background: var(--muted); }
.track .step.on.hat { background: var(--line); }
.track .step.you { background: var(--strong); }
.track .step.now { background: var(--you); }
.track .step.enemy { background: transparent; }
.track .step.enemy.cue { background: var(--ghost); }
.track .step.enemy.parry { background: transparent; box-shadow: inset 0 0 0 3px var(--strong); }
.legend { list-style: none; padding: 0; margin: 16px 0 0; display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 0.9rem; color: var(--muted); }
.legend li { display: flex; align-items: center; gap: 8px; }
.key { display: inline-block; width: 12px; height: 14px; border-radius: 3px; background: var(--ink); }
.key.target { background: var(--strong); }
.key.kick { background: var(--ink); }
.key.snare { background: var(--muted); }
.key.hat { background: var(--line); }
.key.cue { background: var(--ghost); }
.key.parry { box-shadow: inset 0 0 0 3px var(--strong); }
.how { color: var(--muted); max-width: 60ch; line-height: 1.5; margin: 14px 0 0; }

.controls { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.play, .tap {
  font: inherit; font-weight: 700; font-size: 1.05rem; border: 0; border-radius: 999px; padding: 12px 28px; cursor: pointer;
}
.play { color: #fff; background: var(--you); }
.tap { color: #1c1400; background: var(--strong); min-width: 140px; }
.play:disabled, .tap:disabled { opacity: 0.4; cursor: default; }
.play:focus-visible, .tap:focus-visible { outline-color: var(--ink); }
.tap.hit { transform: scale(0.96); }
/* the countdown (-3, -2, -1) and then the beat of the measure, 1 to 3; nothing on beat 4 */
.count { margin: 0; align-self: center; font-weight: 800; font-size: 2rem; color: var(--ink); min-width: 1.6em; text-align: center; font-variant-numeric: tabular-nums; }
.count.pop { animation: pop 160ms ease-out; }
@keyframes pop { from { transform: scale(1.3); } to { transform: scale(1); } }
.track li.live { outline: 2px solid var(--line); outline-offset: 4px; border-radius: 6px; }

/* the results: one dot per clap (round) or parry (square), in order */
.results { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-wrap: wrap; gap: 6px; max-width: 520px; }
.results li { width: 12px; height: 12px; border-radius: 50%; background: var(--line); }
.results li.parry { border-radius: 2px; }
.results li.perfect { background: var(--strong); }
.results li.good { background: var(--you); }

.foot { margin-top: 36px; font-size: 0.9rem; color: var(--muted); max-width: 62ch; line-height: 1.5; }
.foot .note { margin-top: 6px; }

@media (max-width: 480px) {
  .arena { min-height: 220px; gap: 10px; padding: 16px 12px; }
  .token { width: 36px; height: 36px; }
  .unit span { font-size: 0.85rem; }
  .track { column-gap: 8px; }
  .track li { gap: 2px; grid-template-rows: repeat(4, 14px); }
}
@media (prefers-reduced-motion: reduce) {
  .token { transition: none; }
  .arena.hit .token, .arena.crit .token, .ghost .unit.winding .token, .arena.parried .ghost .token { transform: none; }
  .tap.hit { transform: none; }
  .count.pop { animation: none; }
}