:root {
  color-scheme: dark;
  --ink: #12100d;
  --ink-soft: #19150f;
  --paper: #d8c09a;
  --paper-bright: #ead8b7;
  --paper-dim: #a79070;
  --amber: #b87532;
  --amber-deep: #7e4b21;
  --brick: #bd503a;
  --line: #674b2e;
  --line-faint: rgba(216, 192, 154, 0.2);
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "HGS明朝E", serif;
  --sans: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  --content-width: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  line-height: 1.7;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='.42'/%3E%3C/svg%3E");
  content: "";
  opacity: 0.055;
  pointer-events: none;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--paper-bright);
  outline-offset: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 20;
  padding: 0.55rem 0.85rem;
  background: var(--paper-bright);
  color: var(--ink);
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.page-shell {
  width: min(calc(100% - 48px), var(--content-width));
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 80px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 20px;
}

.wordmark {
  color: var(--paper);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.94rem;
  letter-spacing: 0.18em;
  text-decoration: none;
}

.wordmark span {
  color: var(--paper-dim);
}

.track-count {
  display: flex;
  gap: 0.55rem;
  margin: 0;
  color: var(--amber);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
  letter-spacing: 0.12em;
}

.listening-stage {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(42px, 7vw, 102px);
  align-items: center;
  padding: clamp(56px, 8vw, 106px) 24px clamp(50px, 7vw, 88px);
}

.artwork-frame {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  box-shadow: 14px 14px 0 rgba(92, 57, 28, 0.22);
}

.song-artwork {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.03);
}

.registration-mark {
  position: absolute;
  z-index: 2;
  width: 28px;
  height: 28px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  pointer-events: none;
}

.registration-mark::before,
.registration-mark::after {
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--ink);
  content: "";
  transform: translate(-50%, -50%);
}

.registration-mark::before {
  width: 38px;
  height: 1px;
}

.registration-mark::after {
  width: 1px;
  height: 38px;
}

.registration-mark--top {
  top: 18px;
  right: 18px;
}

.registration-mark--bottom {
  bottom: 18px;
  left: 18px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 1.1rem;
  color: var(--amber);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.74rem;
  letter-spacing: 0.19em;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: none;
  margin: 0;
  color: var(--paper-bright);
  font-family: var(--serif);
  font-size: clamp(2.7rem, 4.5vw, 4.65rem);
  font-weight: 500;
  letter-spacing: 0.035em;
  line-height: 1.16;
}

.song-subtitle {
  margin: 1.5rem 0 0;
  color: var(--amber);
  font-family: var(--serif);
  font-size: clamp(1rem, 1.7vw, 1.45rem);
  letter-spacing: 0.12em;
}

.rule {
  width: 100%;
  height: 1px;
  margin: clamp(28px, 4vw, 46px) 0;
  background: var(--line);
}

.player-status {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 28px;
}

.player-status p {
  margin: 0;
  color: var(--amber);
  font-family: var(--serif);
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.status-mark {
  width: 7px;
  height: 7px;
  background: var(--amber);
  transform: rotate(45deg);
}

.player[data-state="playing"] .status-mark,
.player[data-state="ready"] .status-mark,
.player[data-state="paused"] .status-mark {
  background: var(--paper-bright);
}

.player[data-state="missing"] .status-mark,
.player[data-state="error"] .status-mark {
  background: var(--brick);
}

.player-primary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: center;
  margin-top: 1.4rem;
}

.play-button {
  display: grid;
  width: 84px;
  height: 84px;
  border: 1px solid var(--amber);
  border-radius: 50%;
  background: transparent;
  color: var(--paper-bright);
  cursor: pointer;
  font-family: Arial, sans-serif;
  font-size: 1.42rem;
  place-items: center;
  transition:
    background-color 150ms ease,
    color 150ms ease,
    transform 150ms ease;
}

.play-button:not(:disabled):hover {
  background: var(--amber);
  color: var(--ink);
  transform: translateY(-2px);
}

.play-button:disabled {
  border-color: var(--line);
  color: var(--line);
  cursor: not-allowed;
}

#play-glyph {
  display: inline-block;
  margin-left: 0.12em;
  line-height: 1;
}

.player[data-state="playing"] #play-glyph {
  margin-left: 0;
  letter-spacing: -0.08em;
}

.timeline {
  min-width: 0;
}

.time-display {
  display: flex;
  gap: 0.55rem;
  margin-bottom: 0.7rem;
  color: var(--paper-dim);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.93rem;
  letter-spacing: 0.08em;
}

.time-divider {
  color: var(--line);
}

.range-control {
  width: 100%;
  height: 24px;
  margin: 0;
  accent-color: var(--amber);
  cursor: pointer;
}

.range-control:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.player-secondary {
  display: grid;
  grid-template-columns: auto minmax(120px, 230px);
  gap: 1rem;
  align-items: center;
  margin: 1.15rem 0 0 118px;
}

.volume-icon {
  color: var(--paper-dim);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}

.audio-hint {
  max-width: 58ch;
  margin: 1.05rem 0 0 118px;
  color: var(--paper-dim);
  font-size: 0.78rem;
  line-height: 1.65;
}

.track-navigation {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.track-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.track-list li {
  min-width: 0;
}

.track-list li + li {
  border-left: 1px solid var(--line);
}

.track-choice {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1.3rem;
  align-items: center;
  width: 100%;
  min-height: 128px;
  border: 0;
  padding: 1rem clamp(18px, 3vw, 42px);
  background: transparent;
  color: var(--paper-dim);
  text-align: left;
}

button.track-choice {
  cursor: pointer;
}

button.track-choice:hover,
.track-choice[aria-current="true"] {
  color: var(--paper-bright);
}

.track-choice[aria-current="true"] .track-choice-number {
  color: var(--brick);
}

.track-choice[aria-current="true"] .track-choice-title::after {
  display: block;
  width: 52px;
  height: 3px;
  margin-top: 0.7rem;
  background: var(--brick);
  content: "";
}

.track-choice-number {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1;
}

.track-choice-title {
  font-family: var(--serif);
  font-size: clamp(0.95rem, 1.4vw, 1.2rem);
  letter-spacing: 0.08em;
}

.track-choice--empty {
  opacity: 0.58;
}

.lyrics-section {
  position: relative;
  padding: clamp(52px, 7vw, 88px) clamp(8px, 3vw, 40px)
    clamp(68px, 8vw, 104px);
}

.lyrics-header {
  width: min(100%, 720px);
  margin: 0 auto clamp(30px, 4vw, 42px);
}

.lyrics-header h2 {
  margin: 0;
  color: var(--paper-bright);
  font-family: var(--serif);
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.lyrics-grid {
  width: min(100%, 720px);
  margin-inline: auto;
}

.lyric-body {
  color: var(--paper);
  font-family: var(--serif);
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  letter-spacing: 0.045em;
  line-height: 1.75;
}

.lyric-body p {
  margin: 0;
}

.lyric-body p + p {
  margin-top: 0.85em;
}

.lyric-group + .lyric-group {
  margin-top: 1.25em;
}

.private-note {
  width: min(100%, 390px);
  margin: clamp(48px, 6vw, 72px) auto 0;
  border: 1px solid var(--line);
  padding: 1.3rem 1.5rem;
  color: var(--paper-dim);
  font-family: var(--serif);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.private-note p {
  margin: 0;
}

.private-note p + p {
  margin-top: 0.35rem;
}

footer {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 92px;
  border-top: 1px solid var(--line);
  gap: 2.5rem;
  color: var(--paper-dim);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
}

footer p {
  margin: 0;
}

footer a {
  text-decoration-color: var(--line);
  text-underline-offset: 0.3em;
}

.noscript-note {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  z-index: 30;
  margin: 0;
  border: 1px solid var(--brick);
  padding: 1rem;
  background: var(--ink);
  color: var(--paper-bright);
  text-align: center;
}

@media (max-width: 820px) {
  .page-shell {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .listening-stage {
    grid-template-columns: 1fr;
    gap: 48px;
    padding-inline: 0;
  }

  .artwork-frame {
    width: min(100%, 620px);
    margin-inline: auto;
  }

  h1 {
    max-width: none;
    font-size: clamp(2.7rem, 11vw, 4.8rem);
  }

  .track-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .track-list li + li {
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .track-choice {
    grid-template-columns: 1fr;
    gap: 0.45rem;
    min-height: 92px;
    padding: 0.75rem;
    text-align: center;
  }

  .track-choice[aria-current="true"] .track-choice-title::after {
    margin: 0.45rem auto 0;
  }

  .track-choice-number {
    font-size: clamp(1.65rem, 5vw, 2.4rem);
  }

  .track-choice-title {
    font-size: clamp(0.76rem, 2.2vw, 0.92rem);
    letter-spacing: 0.03em;
  }
}

@media (max-width: 600px) {
  .page-shell {
    width: min(calc(100% - 24px), var(--content-width));
  }

  .topbar {
    min-height: 66px;
    margin-top: 12px;
  }

  .wordmark {
    font-size: 0.78rem;
  }

  .wordmark span {
    display: none;
  }

  .listening-stage {
    padding-top: 38px;
    padding-bottom: 46px;
  }

  .player-primary {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 16px;
  }

  .play-button {
    width: 68px;
    height: 68px;
  }

  .player-secondary {
    grid-template-columns: 42px minmax(0, 1fr);
    margin-left: 84px;
  }

  .audio-hint {
    margin-left: 84px;
  }

  .lyric-body {
    font-size: 1rem;
    letter-spacing: 0.025em;
    line-height: 1.72;
  }

  .lyric-group + .lyric-group {
    margin-top: 1.1em;
  }

  .private-note {
    margin-inline: auto;
  }

  footer {
    flex-direction: column;
    gap: 0.25rem;
    min-height: 108px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}