.after-dark {
  color-scheme: dark;
  --paper: #171519;
  --white: #281f23;
  --ink: #eee8e1;
  --muted: #cfc2ba;
  --accent: #efbf9f;
  --line: #b997835c;
  --tint: #21191e;
  --page-gutter: clamp(6rem, 17.4vw, 15rem);
  --content-width: 66rem;
  background:
    radial-gradient(ellipse at 43% 0, #342824, #231d1e 23rem, transparent 55rem),
    radial-gradient(ellipse 53rem 53rem at 100% 29rem, #30232d, transparent 76%),
    var(--paper);
}

.after-dark .wrap {
  width: min(calc(100% - 2 * var(--page-gutter)), var(--content-width));
}

.after-dark .nav { padding-block: .9rem; }
.after-dark .nav nav { gap: .45rem clamp(.65rem, 1.6vw, 1.45rem); }

.after-dark-home .hero {
  grid-template-columns: minmax(0, 1.17fr) minmax(0, .83fr);
  gap: clamp(1.25rem, 3.2vw, 3.4rem);
  padding-block: clamp(2.8rem, 5.3vw, 5.5rem);
}

.after-dark-home .hero h1 {
  font-size: clamp(3.4rem, 8.3vw, 7.75rem);
  line-height: .85;
  letter-spacing: -.048em;
}

.after-dark-home:is(:lang(yue), :lang(zh)) .hero h1 {
  font-size: clamp(2.55rem, 5.7vw, 5.8rem);
  line-height: 1.08;
}

.after-dark-home .hero-accent { color: #dfad91; }

.after-dark-home .eyebrow { margin-bottom: 1.1rem; }

.after-dark-home .hero .intro {
  margin-top: 1.05rem;
  font-size: clamp(.97rem, 1.24vw, 1.11rem);
}

.after-dark-home .hero-photo {
  aspect-ratio: 1;
  border: 1px solid #c8b9b159;
  background: #141414;
}

.after-dark-home .hero-photo img {
  object-position: center;
  transform: none;
  filter: none;
}

.after-dark .button {
  background: #dfb295;
  border-color: #dfb295;
  color: #2a1d19;
}

.after-dark .button:hover {
  background: #f0c5a8;
  border-color: #f0c5a8;
}

.after-dark-home #lessons { display: block; padding-block: clamp(2.15rem, 4.6vw, 4.45rem); }
.after-dark-home #lessons h2 { font-size: clamp(2.5rem, 4.8vw, 5rem); }
.after-dark-home #lessons .wide-break { display: none; }
.after-dark-home #lessons .section-note { margin-top: .6rem; }

.after-dark-home .lessons {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(1.05rem, 3vw, 2.6rem);
  margin-top: 1.45rem;
}

.after-dark-home .lesson {
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  gap: .55rem;
}

.after-dark-home .lesson h3 { font-size: clamp(1.48rem, 2.3vw, 2.2rem); }
.after-dark-home .lesson a { width: fit-content; }
.after-dark-home .lessons .disclosure { grid-column: 1 / -1; }
.after-dark-home .fields :is(input, textarea, select) { border-color: #b9978375; }

.piano-stage {
  position: relative;
  --piano-width: max(var(--page-gutter), (100% - var(--content-width)) / 2);
}

.piano-arc {
  position: absolute;
  inset-block: 0;
  width: var(--piano-width);
  overflow: clip;
}

.piano-arc-low { left: 0; }
.piano-arc-high { right: 0; }

.piano-note {
  position: absolute;
  left: clamp(.72rem, var(--note-x), calc(100% - .72rem));
  top: var(--note-y);
  display: grid;
  width: 1.25rem;
  aspect-ratio: 1;
  place-items: center;
  transform: translate(-50%, -50%);
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--note-tone);
}

.piano-note span {
  position: relative;
  width: var(--note-size);
  aspect-ratio: 1;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 .65rem color-mix(in srgb, currentColor 60%, transparent);
  opacity: var(--note-light);
  transition: opacity 180ms, scale 170ms;
  pointer-events: none;
}

.piano-note:focus-visible span { opacity: 1; scale: 1.16; }

.piano-note.is-playing span {
  animation: piano-note-afterglow var(--note-glow-time, 1030ms) linear;
}

@keyframes piano-note-afterglow {
  0% { opacity: .96; scale: var(--note-bloom, 1.17); }
  30% { opacity: calc(var(--note-light) * .48 + .50); scale: var(--note-bloom-mid, 1.07); }
  72% { opacity: calc(var(--note-light) * .86 + .137); scale: 1; }
  100% { opacity: var(--note-light); scale: 1; }
}

.piano-note.is-playing span::after {
  content: "";
  position: absolute;
  inset: -1px;
  border: 1px solid currentColor;
  border-radius: 50%;
  opacity: .36;
  animation: piano-note-ring var(--note-glow-time, 1030ms) ease-out forwards;
}

@keyframes piano-note-ring {
  to { transform: scale(var(--note-ring, 2.5)); opacity: 0; }
}

.piano-sound {
  min-height: 34px;
  margin-top: .45rem;
  padding: .35rem 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: .76rem;
}

.piano-sound:hover, .piano-sound:focus-visible { color: var(--ink); }
.piano-sound[aria-pressed="true"] { text-decoration: line-through; }

@media (max-width: 860px) {
  .after-dark { --page-gutter: clamp(2.3rem, 9vw, 5rem); }
}

@media (max-width: 750px) {
  .after-dark :is(.site-header, footer) .wrap,
  .after-dark footer.wrap { width: calc(100% - 2.4rem); }
  .after-dark-home .hero { grid-template-columns: minmax(0, 1fr); }
  .after-dark-home .hero-photo { max-width: 25rem; }
  .after-dark .nav { flex-wrap: wrap; gap: .55rem 1rem; }
  .after-dark .nav-links { align-items: flex-start; justify-content: flex-start; }
  .after-dark .nav nav { justify-content: flex-start; }
  .piano-note { left: clamp(.65rem, var(--note-mobile-x), calc(100% - .65rem)); }
  .piano-note span { width: min(5.6px, var(--note-size)); }
}

@media (max-width: 480px) {
  .after-dark-home .lessons { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .piano-note span {
    --note-bloom: 1;
    --note-bloom-mid: 1;
    transition: none;
  }
  .piano-note.is-playing span::after { animation: none; }
}