:root {
  --ink: #efe6d8;
  --dim: #9a8b78;
  --brass: #e0bd7e;

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1rem 1rem 2rem;
  background: radial-gradient(120% 90% at 50% 0%, #241a14, #100b08 70%);
  color: var(--ink);
  font-family: system-ui, sans-serif;
  line-height: 1.5;
}

nav {
  max-width: 54rem;
  margin: 0 auto 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

a {
  color: var(--brass);
  text-decoration: none;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  max-width: 54rem;
  margin: 0 auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  border: 0;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* The stage is locked to the SVG's viewBox ratio so the overlaid buttons and
   main.js's pointer maths agree on where every string is. */
.stage {
  position: relative;
  aspect-ratio: 200 / 430;
  height: min(74vh, 46rem);
  max-width: 100%;
  touch-action: none;
  user-select: none;
}

.guitar {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
  filter: drop-shadow(0 18px 30px rgb(0 0 0 / 55%));
}

/* --- the instrument ---------------------------------------------------- */

.body {
  fill: url("#spruce");
  stroke: #f6ebd3;
  stroke-width: 2.4;
}

.pickguard {
  fill: #3a2116;
  opacity: 0.82;
}

.rosette-outer {
  fill: none;
  stroke: #6b4a2c;
  stroke-width: 3.4;
}

.rosette-inner {
  fill: none;
  stroke: #a8825a;
  stroke-width: 1.6;
}

.soundhole {
  fill: url("#cavity");
}

.bridge {
  fill: #2a1810;
}

.saddle {
  fill: #efe3c9;
}

.pins {
  fill: #f2e8d2;
}

.neck {
  fill: #2c1a11;
}

.fretboard {
  fill: url("#rosewood");
}

.frets line {
  stroke: #cfc6b4;
  stroke-width: 1.5;
  stroke-linecap: round;
}

.inlays {
  fill: #e7dcc4;
  opacity: 0.75;
}

.nut {
  fill: #f0e6cf;
}

.headstock {
  fill: url("#rosewood");
  stroke: #1a0e08;
  stroke-width: 1.2;
}

.posts {
  fill: #cfd0cc;
}

.shafts {
  fill: #b8b9b4;
}

/* --- strings ----------------------------------------------------------- */

.string {
  fill: none;
  stroke-linejoin: round;
  stroke-width: var(--w);
}

.string.wound {
  stroke: url("#bronze");
}

.string.plain {
  stroke: url("#steel");
}

/* A vibrating string reads as a wider, blurred band that settles. Animating
   stroke-width is the cheapest honest version of that. */
.string.ringing {
  animation: vibrate 900ms cubic-bezier(0.1, 0.85, 0.25, 1) forwards;
}

@keyframes vibrate {
  0% {
    stroke-width: calc(var(--w) * 4.5);
    opacity: 0.62;
  }

  35% {
    stroke-width: calc(var(--w) * 2);
    opacity: 0.82;
  }

  100% {
    stroke-width: var(--w);
    opacity: 1;
  }
}

/* Before anything has been played, the strings shimmer in turn — the opening
   screen has to invite the first sound without a caption telling it to. */
.stage:not([data-played]) .string {
  animation: beckon 3.4s ease-in-out infinite;
}

.stage:not([data-played]) .string:nth-child(2) { animation-delay: 90ms; }
.stage:not([data-played]) .string:nth-child(3) { animation-delay: 180ms; }
.stage:not([data-played]) .string:nth-child(4) { animation-delay: 270ms; }
.stage:not([data-played]) .string:nth-child(5) { animation-delay: 360ms; }
.stage:not([data-played]) .string:nth-child(6) { animation-delay: 450ms; }

@keyframes beckon {
  0%, 72%, 100% {
    stroke-width: var(--w);
    opacity: 1;
  }

  84% {
    stroke-width: calc(var(--w) * 2.4);
    opacity: 0.7;
  }
}

.finger {
  fill: #d8452f;
  opacity: 0;
  stroke: #7d1d10;
  stroke-width: 1.2;
  transition: opacity 120ms ease;
}

.finger.down {
  opacity: 0.92;
}

/* --- overlaid controls --------------------------------------------------
   The pointer never uses these: strumming is geometry on .stage, because a
   strum crosses the strings rather than clicking one. They are here so the
   keyboard and a screen reader reach the same instrument. */

.peg,
.stringkey {
  position: absolute;
  border: 0;
  background: none;
  padding: 0;
  cursor: pointer;
}

.peg {
  left: var(--x);
  top: var(--y);
  width: 9%;
  height: 4.2%;
  border-radius: 50%;
  background: linear-gradient(145deg, #f6efe0, #b0a084);
  box-shadow: 0 1px 3px rgb(0 0 0 / 50%);
  transform: translate(-50%, -50%);
}

.stringkey {
  left: var(--x);
  top: 56%;
  width: 4%;
  height: 30%;
  transform: translateX(-50%);
}

.peg:focus-visible,
.stringkey:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

/* --- panel -------------------------------------------------------------- */

.panel {
  width: min(28rem, 100%);
  text-align: center;
}

.chord {
  margin: 0;
  color: var(--brass);
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.tuning {
  margin: 0.15rem 0 0;
  color: var(--dim);
  font-family: ui-monospace, "SF Mono", monospace;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 0.7rem;
}

.action {
  border: 1px solid #4b3626;
  border-radius: 999px;
  background: #241811;
  color: var(--ink);
  padding: 0.4rem 0.9rem;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.action:hover {
  border-color: var(--brass);
}

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

.hint {
  margin: 0.65rem 0 0;
  color: var(--dim);
  font-size: 0.8rem;
}

@media (prefers-reduced-motion: reduce) {
  .string.ringing,
  .stage:not([data-played]) .string {
    animation: none;
  }
}