@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #141e19;
  --text: #e8f1ec;
  --text-dim: #93aca0;
  --key-label: #eaf4ee;
  --shade-0: #2d6a4f;
  --shade-1: #31795a;
  --shade-2: #4f7368;
  --shade-3: #1b4332;
  --key-shadow: rgba(0, 0, 0, 0.55);
  --focus: #7fc8a9;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #e9f0ea;
    --text: #16211b;
    --text-dim: #4c5f55;
    --key-shadow: rgba(20, 46, 34, 0.4);
    --focus: #1f5c41;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
}

body {
  /* board is a square, so its side is capped by both viewport axes;
     12.5rem reserves room for the header, gaps, padding, and dedication;
     vh fallback for browsers without dvh (iOS < 15.4, Chrome < 108) */
  --board-w: min(100%, 28rem, calc(100vh - 12.5rem));
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  padding: max(1rem, env(safe-area-inset-top))
    max(1rem, env(safe-area-inset-right))
    max(1.25rem, env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
}

@supports (height: 100dvh) {
  body {
    --board-w: min(100%, 28rem, calc(100dvh - 12.5rem));
    min-height: 100dvh;
  }
}

.dedication {
  width: var(--board-w);
}

.dedication p {
  margin: 0;
  font-size: 0.7rem;
  line-height: 1.6;
  text-align: center;
  color: var(--text-dim);
}

.dedication .sig {
  display: block;
  margin-top: 0.35rem;
}

.panel {
  width: var(--board-w);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

h1 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  flex-shrink: 0;
}

.status {
  margin: 0;
  font-size: 0.75rem;
  text-align: right;
  color: var(--text-dim);
  min-width: 0;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.board {
  width: var(--board-w);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(0.5rem, 2.4vw, 0.875rem);
}

.key {
  aspect-ratio: 1;
  border: 0;
  border-radius: 18%;
  background: var(--shade-0);
  color: var(--key-label);
  font: inherit;
  font-size: clamp(0.65rem, 2.6vw, 0.85rem);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.4em;
  overflow: hidden;
  box-shadow: 0 4px 0 var(--key-shadow);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
  transition: transform 70ms ease, box-shadow 70ms ease, filter 120ms ease;
}

.key .label {
  word-break: break-word;
  overflow-wrap: anywhere;
  text-align: center;
}

.key.shade-1 {
  background: var(--shade-1);
}

.key.shade-2 {
  background: var(--shade-2);
}

.key.shade-3 {
  background: var(--shade-3);
}

.key:active:not(:disabled) {
  transform: translateY(3px);
  box-shadow: 0 1px 0 var(--key-shadow);
}

.key.playing {
  filter: brightness(1.16);
}

.key.empty {
  opacity: 0.35;
  box-shadow: none;
  cursor: default;
}

/* has a file but its audio hasn't decoded yet */
.key.pending {
  opacity: 0.55;
  box-shadow: none;
}

.key:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .key {
    transition: none;
  }
}