*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1114;
  --panel: #171a1f;
  --line: rgba(255, 255, 255, 0.12);
  --text: #e4e7eb;
  --muted: #8a919b;
  --faint: #5c636d;
  /* one accent per group */
  --nature: #8fc4aa;
  --night: #a3a9e8;
  --domestic: #e2b97f;
  --electronics: #8fb2ea;
  --industrial: #dc957d;
  --transport: #c4a3dc;
  --imaginary: #7fcfd6;
}

[hidden] {
  display: none !important;
}

body {
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  padding: 0.4rem 0.8rem;
  background: var(--panel);
  color: var(--text);
  border-radius: 6px;
  z-index: 10;
}
.skip-link:focus {
  top: 1rem;
}

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

/* ---- Header ---- */
.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1rem 0;
}

h1 {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.home {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--faint);
  text-decoration: none;
  transition: color 0.2s;
}
.home:hover {
  color: var(--text);
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0.5rem 1rem 4rem;
}

.lede {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

/* ---- Catalog ---- */
.catalog {
  display: flex;
  flex-wrap: wrap;
  gap: 1.8rem 2.5rem;
}

.group h2 {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 0.8rem;
}

.circles {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 0.5rem;
}

.sound {
  --accent: var(--muted);
  --lvl: 0;
  width: 96px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: 0;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
}
.sound:focus-visible {
  outline: none;
}

.disc {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: var(--panel);
  transition:
    border-color 0.3s,
    background-color 0.3s,
    color 0.3s;
}
.sound:hover .disc {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--text);
}
.sound:focus-visible .disc {
  outline: 2px solid var(--text);
  outline-offset: 3px;
}

.disc svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.name {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-align: center;
  line-height: 1.25;
}

.sound[aria-pressed="true"] {
  color: var(--accent);
}
.sound[aria-pressed="true"] .disc {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--panel));
  /* breathes with the sound's own level */
  box-shadow: 0 0 calc(4px + var(--lvl) * 26px)
    color-mix(in srgb, var(--accent) calc(15% + var(--lvl) * 45%), transparent);
  transform: scale(calc(1 + var(--lvl) * 0.05));
}
.sound[aria-busy="true"] .disc {
  border-style: dashed;
}

[data-group="nature"] {
  --accent: var(--nature);
}
[data-group="night"] {
  --accent: var(--night);
}
[data-group="domestic"] {
  --accent: var(--domestic);
}
[data-group="electronics"] {
  --accent: var(--electronics);
}
[data-group="industrial"] {
  --accent: var(--industrial);
}
[data-group="transport"] {
  --accent: var(--transport);
}
[data-group="imaginary"] {
  --accent: var(--imaginary);
}

/* ---- Mixer ---- */
.mixer {
  margin-top: 2.4rem;
  border-top: 1px solid var(--line);
  padding-top: 1.2rem;
}

.tracks {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.track {
  display: grid;
  grid-template-columns: 9rem 1fr 1fr 2rem;
  align-items: center;
  gap: 0.4rem 1.2rem;
}

.t-name {
  color: var(--accent);
  font-size: 0.85rem;
}

.t-ctl {
  display: flex;
  flex-direction: column;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--faint);
}

.t-stop {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: none;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}
.t-stop:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.3);
}

.t-info {
  grid-column: 1 / -1;
  font-size: 0.75rem;
  color: var(--faint);
}

.empty {
  font-size: 0.8rem;
  color: var(--faint);
}

/* ---- Master ---- */
.master {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.master-volume {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex: 1 1 14rem;
}
.master-volume input {
  flex: 1;
}

.mains {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.mains button {
  background: none;
  border: 0;
  color: var(--faint);
  font: inherit;
  padding: 0.35rem 0.8rem;
  cursor: pointer;
}
.mains button[aria-pressed="true"] {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.stop-all {
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font: inherit;
  padding: 0.35rem 0.9rem;
  cursor: pointer;
}
.stop-all:hover:not(:disabled) {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.3);
}
.stop-all:disabled {
  opacity: 0.4;
  cursor: default;
}

.status {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--industrial);
}
.status:empty {
  display: none;
}

/* ---- Sliders ---- */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 1.4rem;
  background: none;
  cursor: pointer;
  --accent-track: var(--accent, var(--muted));
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--line);
}
input[type="range"]::-moz-range-track {
  height: 2px;
  background: var(--line);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--accent-track);
  border: 0;
}
input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-track);
  border: 0;
}

@media (max-width: 560px) {
  .group {
    flex-basis: 100%;
  }
  .sound {
    width: calc((100% - 1rem) / 3);
  }
  .track {
    grid-template-columns: 1fr 1fr 2rem;
  }
  .t-name {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sound[aria-pressed="true"] .disc {
    transform: none;
  }
}