:root {
  color-scheme: light;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
  --ink: #2e2720;
  --muted: #6b6259;
  --paper: #f7f3eb;
  --panel: #fffdf8;
  --line: #d8cfc3;
  --accent: #8d2e2e;
  --fixed-do: #375f73;
  --fixed-do-bg: #eef5f7;
  --shadow: 0 18px 48px rgba(48, 36, 24, 0.14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at top, rgba(255,255,255,.95), transparent 40rem),
    var(--paper);
}

button, input { font: inherit; }

.app-shell {
  width: min(calc(100% - 1rem), 68rem);
  margin-inline: auto;
  padding: clamp(1rem, 2.5vw, 2.5rem) 0 4rem;
}

.app-header {
  max-width: 64rem;
  margin: 0 auto .8rem;
  padding-inline: .5rem;
  text-align: center;
}
.eyebrow {
  margin: 0 0 .5rem;
  color: var(--accent);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}
h1 {
  margin: 0;
  font-size: clamp(1.45rem, 4.5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -.025em;
  white-space: nowrap;
}
.lead { margin: .65rem auto 0; max-width: 48rem; color: var(--muted); }

.wheel-panel {
  padding: .2rem 0 .8rem;
  border: 1px solid var(--line);
  border-radius: .9rem;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.wheel-stage {
  position: relative;
  width: min(100%, 46rem);
  aspect-ratio: 1;
  margin-inline: auto;
  touch-action: none;
  user-select: none;
  cursor: default;
}
.wheel-stage[data-interactive="true"] { cursor: grab; }
.wheel-stage[data-sound-target="true"] { cursor: pointer; }
.wheel-stage.is-dragging { cursor: grabbing; }
.wheel-object { display: block; width: 100%; height: 100%; pointer-events: none; }

.sound-help {
  max-width: 48rem;
  margin: .2rem auto 0;
  padding-inline: .8rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.55;
}
.sound-status {
  margin: .2rem auto 0;
  padding-inline: .8rem;
  color: var(--accent);
  text-align: center;
  font-size: .9rem;
  font-weight: 700;
}
.sound-status:empty { display: none; }

.readout {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: .45rem .85rem;
  margin: .35rem auto 0;
  min-height: 2.8rem;
  padding-inline: .8rem;
}
.readout-label { color: var(--muted); font-size: .9rem; }
#current-name { font-size: 1.5rem; }
#current-western, #current-angle { color: var(--muted); }
.fixed-do-readout {
  padding: .18rem .48rem;
  border-radius: .45rem;
  color: var(--fixed-do);
  background: var(--fixed-do-bg);
  font-size: .9rem;
  font-weight: 700;
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .65rem;
  max-width: 32rem;
  margin: .65rem auto 0;
  padding-inline: .8rem;
}
button {
  min-height: 2.8rem;
  padding: .65rem 1rem;
  border: 1px solid #b9aea1;
  border-radius: .75rem;
  color: var(--ink);
  background: #fff;
  cursor: pointer;
}
button:hover { background: #f2ece3; }
button:focus-visible, input:focus-visible { outline: 3px solid rgba(141,46,46,.35); outline-offset: 2px; }

.display-options {
  display: grid;
  gap: .7rem;
  max-width: 40rem;
  margin: .85rem auto 0;
  padding-inline: .8rem;
}
.display-option {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: .7rem;
  padding: .85rem 1rem;
  border: 1px solid #b9cbd2;
  border-radius: .85rem;
  background: var(--fixed-do-bg);
  cursor: pointer;
}
.display-option:hover { border-color: var(--fixed-do); }
.display-option input {
  width: 1.2rem;
  height: 1.2rem;
  margin-top: .15rem;
  accent-color: var(--fixed-do);
}
.display-option strong {
  display: block;
  color: var(--fixed-do);
}
.display-option small {
  display: block;
  margin-top: .25rem;
  color: #53656d;
  line-height: 1.55;
}
.mode-option {
  border-color: #d4c6b8;
  background: #faf7f1;
}
.mode-option:hover { border-color: var(--accent); }
.mode-option input { accent-color: var(--accent); }
.mode-option strong { color: var(--ink); }
.mode-option small { color: var(--muted); }

.tuning-settings {
  max-width: 48rem;
  margin: .9rem auto 0;
  padding: .8rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: #fffdf9;
}
.tuning-settings legend {
  padding: 0 .35rem;
  color: var(--muted);
  font-size: .85rem;
  font-weight: 700;
}
.tuning-system-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
}
.tuning-system-option {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: .65rem;
  padding: .75rem .8rem;
  border: 1px solid transparent;
  border-radius: .8rem;
  background: #faf7f1;
  cursor: pointer;
}
.tuning-system-option:hover { border-color: #c8bbae; }
.tuning-system-option:has(input:checked) {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(141,46,46,.1);
}
.tuning-system-option input {
  width: 1.15rem;
  height: 1.15rem;
  margin-top: .15rem;
  accent-color: var(--accent);
}
.tuning-system-option strong { display: block; }
.tuning-system-option small {
  display: block;
  margin-top: .2rem;
  color: var(--muted);
  line-height: 1.5;
}
.pitch-standard-control {
  display: grid;
  grid-template-columns: auto minmax(8rem, 1fr) auto;
  align-items: center;
  gap: .75rem;
  margin-top: .9rem;
  padding: .8rem;
  border: 1px solid #ddd3c7;
  border-radius: .8rem;
  background: #fff;
}
.pitch-standard-control > label { font-weight: 700; }
#pitch-standard-range {
  width: 100%;
  accent-color: var(--accent);
}
.pitch-standard-number {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}
#pitch-standard-number {
  width: 5.2rem;
  min-height: 2.4rem;
  padding: .35rem .45rem;
  border: 1px solid #b9aea1;
  border-radius: .55rem;
  background: #fff;
  font-variant-numeric: tabular-nums;
}
.pitch-standard-help {
  display: block;
  margin: .45rem .2rem 0;
  color: var(--muted);
  line-height: 1.5;
}
.tuning-setting-summary {
  margin: .55rem 0 0;
  color: var(--accent);
  text-align: center;
  font-weight: 700;
}

.playback-modes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
  max-width: 48rem;
  margin: .85rem auto 0;
  padding: .8rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: #faf7f1;
}
.playback-modes legend {
  padding: 0 .35rem;
  color: var(--muted);
  font-size: .85rem;
  font-weight: 700;
}
.playback-mode {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: .65rem;
  padding: .75rem .8rem;
  border: 1px solid transparent;
  border-radius: .8rem;
  background: #fff;
  cursor: pointer;
}
.playback-mode:hover { border-color: #c8bbae; }
.playback-mode:has(input:checked) {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(141,46,46,.1);
}
.playback-mode input {
  width: 1.15rem;
  height: 1.15rem;
  margin-top: .15rem;
  accent-color: var(--accent);
}
.playback-mode strong { display: block; }
.playback-mode small {
  display: block;
  margin-top: .2rem;
  color: var(--muted);
  line-height: 1.5;
}

.snap-control {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: .55rem;
  margin: 1rem .8rem .2rem;
  color: var(--muted);
  font-size: .92rem;
}
.snap-control input { width: 1.15rem; height: 1.15rem; }

.note {
  margin-top: 1.4rem;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--accent);
  background: rgba(255,255,255,.55);
}
.note h2 { margin: 0 0 .35rem; font-size: 1rem; }
.note p { margin: 0; color: var(--muted); line-height: 1.75; }

.pitch-reference {
  margin-top: 1.6rem;
  padding: clamp(1rem, 3vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: rgba(255,255,255,.72);
}
.section-heading { text-align: center; }
.section-heading h2 { margin: 0; font-size: clamp(1.45rem, 3vw, 2rem); }
.section-heading p:last-child { margin: .5rem 0 0; color: var(--muted); }
.frequency-table-wrap { overflow-x: auto; margin-top: 1rem; }
.frequency-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
.frequency-table th,
.frequency-table td {
  padding: .58rem .65rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}
.frequency-table thead th {
  color: var(--muted);
  font-size: .82rem;
  letter-spacing: .04em;
}
.frequency-table tbody th { font-weight: 700; }
.frequency-table td:last-child,
.frequency-table th:last-child { text-align: center; }
.play-pitch {
  min-width: 2.35rem;
  min-height: 2.15rem;
  padding: .3rem .55rem;
  border-radius: 999px;
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  line-height: 1;
}
.play-pitch:hover { background: #6f2222; }
.play-pitch[aria-pressed="true"] {
  background: #2f5f4a;
  border-color: #2f5f4a;
  box-shadow: 0 0 0 3px rgba(47,95,74,.18);
}
.play-pitch[aria-pressed="true"]:hover { background: #244b3a; }
.source-note {
  margin: 1rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.8;
}

.tool-footer {
  margin-top: 1.6rem;
  padding: 1rem 1.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.7;
}
.tool-footer p { margin: .15rem 0; }
.operator-disclaimer {
  margin: 0 0 .9rem !important;
  padding: .75rem .9rem;
  border-left: 3px solid var(--accent);
  background: rgba(141,46,46,.06);
  color: var(--ink);
}
.footer-label {
  display: inline-block;
  min-width: 7.2em;
  color: var(--ink);
  font-weight: 700;
}
.tool-footer a {
  color: var(--accent);
  overflow-wrap: anywhere;
}
.tool-footer a:hover { text-decoration-thickness: 2px; }

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

@media (max-width: 34rem) {
  .app-shell { width: 100%; padding: .55rem .25rem 3rem; }
  .app-header { margin-bottom: .4rem; padding-inline: .35rem; }
  h1 {
    font-size: clamp(1.22rem, 5.7vw, 1.48rem);
    letter-spacing: -.045em;
    white-space: nowrap;
  }
  .lead { margin-top: .45rem; font-size: .92rem; line-height: 1.55; }
  .wheel-panel { padding-top: .1rem; border-radius: .55rem; }
  .wheel-stage {
    width: 100%;
    max-width: none;
    margin-inline: auto;
    transform: none;
  }
  .sound-help { margin-top: .1rem; padding-inline: .75rem; font-size: .95rem; }
  .readout { margin-top: .2rem; }
  .tuning-system-options,
  .playback-modes { grid-template-columns: 1fr; }
  .tuning-settings,
  .playback-modes { margin-inline: .55rem; }
  .pitch-standard-control {
    grid-template-columns: 1fr auto;
  }
  .pitch-standard-control > label { grid-column: 1 / -1; }
  #pitch-standard-range { grid-column: 1; }
  .pitch-standard-number { grid-column: 2; }
  .controls { grid-template-columns: 1fr 1fr; }
  #reset { grid-column: 1 / -1; grid-row: 2; }
  .display-option { padding: .75rem .8rem; }
  .note, .pitch-reference { margin-inline: .3rem; }
  .frequency-table th,
  .frequency-table td { padding: .5rem .55rem; }
  .tool-footer { margin-inline: .3rem; padding-inline: .7rem; }
  .footer-label { min-width: 0; margin-right: .45rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}