/* =========================================================================
 * Tuner page — chromatic + instrument-preset tuner with locked-target
 * mode, note carousel, wide-fan dial, temperament + tone-naming options,
 * and a collapsible reference-pitch section.
 *
 * Layout (mobile-first portrait):
 *   - shared instrument-controls bar carries the settings (instrument,
 *     A4, temperament, naming, volume) and wraps freely on phones
 *   - .tuner-card stacks: string tabs → note carousel → dial → readout
 *   - .tuner-controls holds the big mic toggle
 *   - .tuner-fallback shows permission/insecure-origin diagnostics
 *   - .reference-section is a <details> that the user pops open by hand
 *
 * Visual identity stays in the indigo / pink / green palette that
 * /play/style.css defines, so the page reads as "the tuner from this
 * music studio" rather than a clone of any commercial tuner.
 * ========================================================================= */

.tuner-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 8px 16px 24px;
}

/* ---- Settings bar additions ------------------------------------------ */

.control input[type='number']#a4-ref {
  width: 70px;
  background: rgba(30, 41, 59, 0.85);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 8px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
}

.control input[type='number']#a4-ref:focus {
  outline: none;
  border-color: var(--accent);
}

.control-suffix {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-left: -4px;
}

/* ---- Tuner card ------------------------------------------------------ */

.tuner-card {
  width: min(100%, 520px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 16px 16px;
  border-radius: 22px;
  background: linear-gradient(160deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.7));
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
  transition: border-color 200ms ease, box-shadow 200ms ease;
}

.tuner-card[data-state='in-tune'] {
  border-color: rgba(52, 211, 153, 0.55);
  box-shadow: 0 0 24px -4px rgba(52, 211, 153, 0.45);
}

.tuner-card[data-state='listening'] {
  border-color: rgba(129, 140, 248, 0.45);
}

/* ---- String tabs ----------------------------------------------------- */

.string-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.string-tabs[hidden] {
  display: none;
}

.string-tab-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
}

.string-tab {
  min-height: 36px;
  min-width: 44px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(30, 41, 59, 0.85);
  color: var(--fg);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  display: inline-flex;
  align-items: center;
  gap: 2px;
  touch-action: manipulation;
  transition: border-color 120ms ease, background 120ms ease,
    color 120ms ease, transform 100ms ease;
}

.string-tab sub {
  font-size: 0.65em;
  font-weight: 600;
  color: var(--fg-dim);
  margin-left: 1px;
}

.string-tab:hover {
  border-color: var(--accent);
}

.string-tab:active {
  transform: scale(0.95);
}

.string-tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.string-tab[aria-pressed='true'] {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 14px -6px rgba(129, 140, 248, 0.7);
}

.string-tab[aria-pressed='true'] sub {
  color: rgba(255, 255, 255, 0.8);
}

.string-tab-auto {
  margin-left: 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.string-tab-auto[aria-pressed='true'] {
  background: linear-gradient(135deg, var(--accent-3), #86efac);
  color: #042f2e;
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 14px -6px rgba(52, 211, 153, 0.7);
}

/* ---- Note carousel --------------------------------------------------- */

.note-carousel {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: end;
  gap: 4px;
  padding: 4px 0 0;
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  letter-spacing: -0.02em;
}

.carousel-note {
  text-align: center;
  color: var(--fg-dim);
  line-height: 1;
  transition: color 200ms ease, opacity 200ms ease, transform 200ms ease;
  white-space: nowrap;
}

.carousel-note-far {
  font-size: clamp(14px, 4vw, 20px);
  opacity: 0.35;
}

.carousel-note-near {
  font-size: clamp(20px, 6vw, 32px);
  opacity: 0.6;
}

.carousel-note-active {
  font-size: clamp(60px, 14vw, 96px);
  font-weight: 800;
  color: var(--fg);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}

.carousel-note-active sub {
  font-size: 0.32em;
  font-weight: 600;
  vertical-align: baseline;
  -webkit-text-fill-color: var(--fg-dim);
  color: var(--fg-dim);
  background: none;
  letter-spacing: 0;
}

.tuner-card[data-state='in-tune'] .carousel-note-active {
  background: linear-gradient(135deg, var(--accent-3), #86efac);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Brief flash when the centre note flips, so it's obvious the value
 * changed even if the new note glyph happens to look similar. */
.carousel-note-active.flash {
  animation: carousel-flash 240ms ease-out;
}

@keyframes carousel-flash {
  0% { transform: scale(1.06); filter: drop-shadow(0 0 12px rgba(244, 114, 182, 0.4)); }
  100% { transform: scale(1); filter: drop-shadow(0 0 0 rgba(0, 0, 0, 0)); }
}

/* ---- Wide-fan dial --------------------------------------------------- */

/*
 * Geometry note (must stay in sync with the SVG `viewBox` in
 * index.html: -80 -10 360 220):
 *   pivot in container = (50%, 95.45%)  → bottom: 4.55%
 *   arm length         = (200 - 35) / 220 = 75% of container height
 *   cents-to-angle     = ±100¢ → ±70°  (each cent = 0.7°)
 */

.tuner-dial {
  position: relative;
  width: 100%;
  aspect-ratio: 360 / 220;
  color: var(--fg-dim);
}

.tuner-dial-svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.tuner-arm {
  position: absolute;
  left: 50%;
  bottom: 4.55%;
  width: 4px;
  height: 75%;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  box-shadow:
    0 0 10px rgba(129, 140, 248, 0.55),
    inset 0 0 0 0.5px rgba(255, 255, 255, 0.15);
  transform-origin: 50% 100%;
  --needle: 0;
  /* Cents range is ±100, mapped to ±70° of arm rotation. */
  transform: translateX(-50%) rotate(calc(var(--needle) * 70deg));
  transition:
    transform 80ms linear,
    background 160ms ease,
    box-shadow 160ms ease,
    opacity 160ms ease;
  opacity: 0;
  pointer-events: none;
}

.tuner-arm::before {
  content: '';
  position: absolute;
  top: -7px;
  left: 50%;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 10px solid var(--accent-2);
  transform: translateX(-50%);
  filter: drop-shadow(0 0 6px rgba(244, 114, 182, 0.6));
}

.tuner-card[data-state='listening'] .tuner-arm,
.tuner-card[data-state='in-tune'] .tuner-arm {
  opacity: 1;
}

.tuner-card[data-state='in-tune'] .tuner-arm {
  background: linear-gradient(180deg, #86efac, var(--accent-3));
  box-shadow:
    0 0 14px rgba(52, 211, 153, 0.75),
    inset 0 0 0 0.5px rgba(255, 255, 255, 0.2);
}

.tuner-card[data-state='in-tune'] .tuner-arm::before {
  border-bottom-color: var(--accent-3);
  filter: drop-shadow(0 0 8px rgba(52, 211, 153, 0.8));
}

.tuner-pivot {
  position: absolute;
  left: 50%;
  bottom: 4.55%;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #f8fafc, var(--bg-2) 70%);
  border: 2px solid var(--accent);
  box-shadow:
    0 0 10px rgba(129, 140, 248, 0.55),
    inset 0 -2px 0 rgba(0, 0, 0, 0.4);
  transform: translate(-50%, 50%);
  pointer-events: none;
}

.tuner-card[data-state='in-tune'] .tuner-pivot {
  border-color: var(--accent-3);
  box-shadow:
    0 0 14px rgba(52, 211, 153, 0.75),
    inset 0 -2px 0 rgba(0, 0, 0, 0.4);
}

/* ---- Readout row ----------------------------------------------------- */

.tuner-readout {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  margin-top: 4px;
}

.tuner-cents {
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  color: var(--fg-dim);
  font-weight: 700;
  font-size: 16px;
  text-align: left;
}

.tuner-card[data-state='in-tune'] .tuner-cents {
  color: var(--accent-3);
}

.tuner-freq {
  font-size: 13px;
  color: var(--fg-dim);
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  text-align: center;
  white-space: nowrap;
}

.tuner-status-pill {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: rgba(148, 163, 184, 0.15);
  border: 1px solid var(--border);
  color: var(--fg-dim);
}

.tuner-status-pill[data-status='listening'] {
  background: rgba(129, 140, 248, 0.15);
  border-color: rgba(129, 140, 248, 0.4);
  color: var(--accent);
}

.tuner-status-pill[data-status='in-tune'] {
  background: rgba(52, 211, 153, 0.18);
  border-color: rgba(52, 211, 153, 0.45);
  color: var(--accent-3);
}

.tuner-status-pill[data-status='flat'],
.tuner-status-pill[data-status='sharp'] {
  background: rgba(244, 114, 182, 0.16);
  border-color: rgba(244, 114, 182, 0.4);
  color: var(--accent-2);
}

/* ---- Mic toggle button ---------------------------------------------- */

.tuner-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
}

.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease,
    box-shadow 120ms ease, transform 100ms ease;
}

.primary-btn {
  min-width: 200px;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: rgba(255, 255, 255, 0.12);
  color: #fff;
  box-shadow: 0 6px 18px -8px rgba(129, 140, 248, 0.7);
}

.primary-btn:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}

.primary-btn:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.primary-btn[aria-pressed='true'] {
  background: linear-gradient(135deg, #ef4444, #f97316);
  box-shadow: 0 6px 18px -8px rgba(239, 68, 68, 0.7);
}

.secondary-btn {
  background: rgba(30, 41, 59, 0.85);
  color: var(--fg);
}

.secondary-btn:hover {
  border-color: var(--accent);
}

.secondary-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-icon {
  font-size: 16px;
  line-height: 1;
}

/* ---- Permission/error fallback card --------------------------------- */

.tuner-fallback {
  width: min(100%, 520px);
  padding: 16px 18px;
  border-radius: 14px;
  background: rgba(244, 114, 182, 0.08);
  border: 1px solid rgba(244, 114, 182, 0.32);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tuner-fallback[hidden] {
  display: none;
}

.fallback-title {
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-2);
  letter-spacing: 0.02em;
}

.fallback-message {
  font-size: 13px;
  color: var(--fg);
  line-height: 1.45;
}

.fallback-message a {
  color: #a5b4fc;
}

#fallback-retry {
  align-self: flex-start;
  margin-top: 4px;
}

/* ---- Reference pitches (collapsible <details>) ---------------------- */

.reference-section {
  width: min(100%, 520px);
  padding: 0;
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(30, 41, 59, 0.55), rgba(15, 23, 42, 0.55));
  border: 1px solid var(--border);
  overflow: hidden;
}

.reference-summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fg);
}

.reference-summary::-webkit-details-marker {
  display: none;
}

.reference-summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 6px;
  color: var(--fg-dim);
  transition: transform 200ms ease;
}

.reference-section[open] .reference-summary::before {
  transform: rotate(90deg);
}

.reference-summary-label {
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--fg-dim);
  flex: 1;
}

.reference-summary-hint {
  font-size: 11px;
  color: var(--fg-dim);
  font-style: italic;
}

.reference-body {
  padding: 4px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.reference-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.reference-options .toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--fg-dim);
  font-size: 12px;
  letter-spacing: 0;
}

.reference-options .toggle-label input[type='checkbox'] {
  accent-color: var(--accent);
  transform: scale(1.1);
}

.reference-section[data-clamped='true'] .octave-buttons {
  opacity: 0.4;
  pointer-events: none;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}

.ref-btn {
  min-height: 48px;
  padding: 10px 4px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(30, 41, 59, 0.85);
  color: var(--fg);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  touch-action: manipulation;
  transition: border-color 120ms ease, background 120ms ease,
    transform 100ms ease, box-shadow 120ms ease;
}

.ref-btn.is-sharp {
  color: var(--fg-dim);
  font-size: 13px;
}

.ref-btn:hover {
  border-color: var(--accent);
}

.ref-btn:active {
  transform: scale(0.96);
}

.ref-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.ref-btn[aria-pressed='true'] {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: rgba(255, 255, 255, 0.18);
  color: #fff;
  box-shadow: 0 6px 16px -8px rgba(129, 140, 248, 0.7);
}

.reference-hint {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--fg-dim);
  text-align: center;
}

/* ---- Reduced motion -------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .tuner-arm,
  .tuner-card,
  .ref-btn,
  .primary-btn,
  .secondary-btn,
  .carousel-note,
  .string-tab,
  .reference-summary::before {
    transition: none !important;
  }
  .carousel-note-active.flash {
    animation: none !important;
  }
}

/* ---- Mobile: opt out of the shared 100dvh body clamp ----------------- *
 * play/style.css clamps `.instrument-body` to `height: 100dvh; overflow:
 * hidden` on phones so per-instrument stages (piano, guitar, drums, …)
 * can scroll internally. The tuner is a normal scrolling page — when the
 * <details> "Reference pitches" section is opened it grows past the
 * viewport, and we want the page (not an inner stage) to scroll. */
@media (max-width: 720px), (max-height: 540px) {
  .instrument-body {
    height: auto;
    overflow: visible;
    padding-bottom: 24px;
  }
}

/* ---- Narrow phones --------------------------------------------------- */

@media (max-width: 380px) {
  .reference-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .ref-btn {
    font-size: 15px;
  }
  .ref-btn.is-sharp {
    font-size: 12px;
  }
  .string-tab {
    min-width: 40px;
    font-size: 13px;
    padding: 4px 8px;
  }
  .tuner-readout {
    grid-template-columns: 1fr;
    gap: 4px;
    text-align: center;
  }
  .tuner-cents,
  .tuner-status-pill {
    text-align: center;
    justify-self: center;
  }
}