.tuner-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 72px;
}

.tuner-hero {
  max-width: 820px;
  margin-bottom: 52px;
}

.tuner-hero h1 {
  margin: 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: clamp(3rem, 6vw, 5.25rem);
  font-weight: 400;
  line-height: 0.9;
  text-wrap: balance;
}

.tuner-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  gap: 24px;
  align-items: start;
}

.tuner-card,
.tuning-library {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.tuner-card {
  padding: 30px;
}

.tuner-card-heading,
.tuning-library-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.tuner-card-heading h2,
.tuning-library-heading h2 {
  margin: 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 400;
  line-height: 1;
  text-wrap: balance;
}

#tuner-toggle,
.reference-tone {
  min-height: 46px;
  border: 1px solid var(--dark-ring);
  border-radius: 9px;
  color: var(--surface);
  background: var(--dark-ring);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

#tuner-toggle {
  padding: 0 18px;
  white-space: nowrap;
}

#tuner-toggle[aria-pressed="true"] {
  color: var(--ink);
  background: var(--accent-soft);
}

#tuner-toggle:disabled {
  cursor: wait;
  opacity: 0.65;
}

#tuner-toggle:focus-visible,
.reference-tone:focus-visible,
#tuning-select:focus-visible,
#concert-pitch:focus-visible {
  outline: 3px solid var(--accent-soft);
  outline-offset: 3px;
}

.tuner-status,
.tuner-error {
  margin: 16px 0 0;
  font-size: 0.76rem;
  line-height: 1.5;
  text-wrap: pretty;
}

.tuner-status {
  color: var(--muted);
}

.tuner-error:empty {
  display: none;
}

.tuner-error {
  padding: 10px 12px;
  border-left: 3px solid #a33c2d;
  color: #702a20;
  background: #fae9e5;
  font-weight: 700;
}

.pitch-display {
  margin-top: 24px;
  padding: 28px;
  border-radius: 16px;
  color: var(--surface);
  background: var(--dark-ring);
  text-align: center;
}

.pitch-caption {
  margin: 0;
  color: #d8d1c2;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
}

.detected-note {
  display: block;
  margin-top: 4px;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: clamp(5rem, 14vw, 8rem);
  line-height: 0.9;
  font-variant-numeric: tabular-nums;
}

.detected-frequency,
.closest-string {
  margin: 8px 0 0;
  color: #ded9cf;
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
  text-wrap: pretty;
}

.closest-string {
  color: var(--accent-soft);
  font-weight: 700;
}

.cent-gauge {
  margin-top: 24px;
}

.gauge-labels {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 700;
}

.gauge-track {
  position: relative;
  height: 72px;
  margin-top: 8px;
  border-bottom: 5px solid var(--line);
}

.gauge-center {
  position: absolute;
  bottom: -5px;
  left: 50%;
  width: 5px;
  height: 18px;
  background: var(--accent);
  transform: translateX(-50%);
}

.gauge-needle {
  --needle-angle: 0deg;
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 3px;
  height: 64px;
  border-radius: 3px;
  background: var(--ink);
  transform: translateX(-50%) rotate(var(--needle-angle));
  transform-origin: 50% 100%;
  transition: transform 100ms ease-out;
}

#cent-meter {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.cent-reading {
  display: block;
  margin-top: 10px;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  text-align: center;
}

.calibration-control {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: 12px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.calibration-control label {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
}

.calibration-control > div {
  display: flex;
  align-items: center;
  gap: 6px;
}

#concert-pitch {
  width: 78px;
  min-height: 42px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
  font: inherit;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.calibration-control span,
.calibration-control p,
.microphone-note,
.reference-note {
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.55;
  text-wrap: pretty;
}

.calibration-control p {
  margin: 0;
}

.microphone-note {
  margin: 18px 0 0;
}

.tuning-library-heading {
  padding: 30px;
  border-bottom: 1px solid var(--line);
}

.tuning-library-heading label {
  width: min(190px, 48%);
}

.tuning-library-heading label span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
}

#tuning-select {
  width: 100%;
  min-height: 46px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--ink);
  background: var(--surface);
  font: inherit;
  font-weight: 700;
}

.tuning-summary {
  padding: 26px 30px 20px;
}

.tuning-notation-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
}

.tuning-summary h3 {
  margin: 6px 0 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: 2.15rem;
  font-weight: 400;
  line-height: 1;
  text-wrap: balance;
}

.tuning-notation {
  margin: 8px 0 0;
  color: #9a5d21;
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

#tuning-description {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.6;
  text-wrap: pretty;
}

.tuning-strings {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0 30px;
  list-style: none;
}

.tuning-string {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--paper);
}

.string-number {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  color: var(--surface);
  background: var(--dark-ring);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.string-pitch strong,
.string-pitch span {
  display: block;
}

.string-pitch strong {
  font-size: 1rem;
}

.string-pitch span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.66rem;
  font-variant-numeric: tabular-nums;
}

.reference-tone {
  padding: 0 12px;
  font-size: 0.7rem;
}

.reference-note {
  margin: 20px 30px 28px;
}

@media (max-width: 900px) {
  .tuner-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .tuner-shell {
    width: min(100% - 24px, 1180px);
    padding-top: 24px;
  }

  .tuner-hero {
    margin-bottom: 40px;
  }

  .tuner-card,
  .tuning-library-heading,
  .tuning-summary {
    padding-right: 18px;
    padding-left: 18px;
  }

  .tuner-card-heading,
  .tuning-library-heading {
    align-items: stretch;
    flex-direction: column;
  }

  #tuner-toggle,
  .tuning-library-heading label {
    width: 100%;
  }

  .pitch-display {
    padding: 24px 16px;
  }

  .calibration-control {
    grid-template-columns: 1fr auto;
  }

  .calibration-control p {
    grid-column: 1 / -1;
  }

  .tuning-strings {
    padding-right: 18px;
    padding-left: 18px;
  }

  .tuning-string {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .reference-tone {
    grid-column: 1 / -1;
    width: 100%;
  }

  .reference-note {
    margin-right: 18px;
    margin-left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .gauge-needle {
    transition: none;
  }
}