:root {
  --ink: #121a1f;
  --ink-soft: #1c2a33;
  --fog: #d7e0e6;
  --mist: #9aafbd;
  --amber: #e0a03a;
  --amber-hot: #f0c06a;
  --teal: #2f6f6a;
  --card: rgba(28, 42, 51, 0.72);
  --line: rgba(215, 224, 230, 0.12);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 20px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "DM Sans", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--fog);
  background:
    radial-gradient(1200px 700px at 10% -10%, rgba(47, 111, 106, 0.35), transparent 55%),
    radial-gradient(900px 600px at 100% 0%, rgba(224, 160, 58, 0.18), transparent 50%),
    linear-gradient(165deg, #0d1418 0%, var(--ink) 45%, #18262e 100%);
  overflow-x: hidden;
}

.glow {
  position: fixed;
  inset: auto -20% -30% -20%;
  height: 55vh;
  background: radial-gradient(ellipse at center, rgba(224, 160, 58, 0.08), transparent 65%);
  pointer-events: none;
  z-index: 0;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.app {
  position: relative;
  z-index: 2;
  width: min(720px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
  display: grid;
  gap: 1.5rem;
}

.app.is-chords {
  width: min(1280px, calc(100% - 1.25rem));
  padding: 0.75rem 0 1rem;
  gap: 0.65rem;
  min-height: 100vh;
  min-height: 100dvh;
}

.app.is-chords .brand__title,
.app.is-chords .brand__sub {
  display: none;
}

.app.is-chords .brand__mark {
  font-size: 1.55rem;
  margin: 0;
}

.brand__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.tabs {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.3rem;
  padding: 0.25rem;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line);
}

.tabs__btn {
  appearance: none;
  border: 0;
  border-radius: 9px;
  padding: 0.5rem 0.95rem;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--mist);
  background: transparent;
  cursor: pointer;
}

.tabs__btn.is-active {
  background: linear-gradient(180deg, rgba(224, 160, 58, 0.95), rgba(184, 120, 30, 0.95));
  color: #1a1205;
}

.panel {
  display: grid;
  gap: 1.5rem;
}

.panel[hidden] {
  display: none !important;
}

.panel--chords {
  gap: 0;
  min-height: 0;
  flex: 1;
}

.brand__mark {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--amber-hot);
  animation: rise 0.7s ease both;
}

.brand__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3.4vw, 1.65rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--fog);
  animation: rise 0.7s ease 0.08s both;
}

.brand__sub {
  margin: 0.65rem 0 0;
  max-width: 34rem;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.45;
  animation: rise 0.7s ease 0.14s both;
}

.controls {
  display: grid;
  gap: 0.9rem;
  padding: 1.1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  animation: rise 0.7s ease 0.18s both;
}

.segment {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem;
  padding: 0.3rem;
  background: rgba(0, 0, 0, 0.28);
  border-radius: 14px;
}

.segment__btn {
  appearance: none;
  border: 0;
  border-radius: 11px;
  padding: 0.75rem 0.9rem;
  font: inherit;
  font-weight: 600;
  color: var(--mist);
  background: transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}

.segment__btn:hover {
  color: var(--fog);
}

.segment__btn.is-active {
  background: linear-gradient(180deg, rgba(224, 160, 58, 0.95), rgba(184, 120, 30, 0.95));
  color: #1a1205;
}

.segment__btn:active {
  transform: scale(0.98);
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field__label {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--mist);
}

.field__label output {
  color: var(--amber-hot);
  font-weight: 600;
}

.field__select {
  width: 100%;
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  background:
    linear-gradient(45deg, transparent 50%, var(--mist) 50%) right 1rem center / 0.4rem 0.4rem no-repeat,
    linear-gradient(135deg, transparent 50%, var(--mist) 50%) right 0.65rem center / 0.4rem 0.4rem no-repeat,
    rgba(0, 0, 0, 0.28);
  color: var(--fog);
  font: inherit;
}

.field__select:focus,
.field--range input:focus {
  outline: 2px solid rgba(224, 160, 58, 0.55);
  outline-offset: 2px;
}

.field--range input[type="range"] {
  width: 100%;
  accent-color: var(--amber);
}

.stage {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 1rem;
  min-height: 7.5rem;
  padding: 1.25rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(47, 111, 106, 0.22), transparent 55%),
    rgba(18, 26, 31, 0.65);
  animation: rise 0.7s ease 0.22s both;
}

.now__hint {
  margin: 0;
  color: var(--mist);
  font-size: 0.9rem;
}

.now__note {
  margin: 0.2rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 3.8rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

.now__freq {
  margin: 0.35rem 0 0;
  font-variant-numeric: tabular-nums;
  color: var(--amber-hot);
  font-weight: 600;
}

.wave {
  display: flex;
  align-items: end;
  gap: 0.35rem;
  height: 3.2rem;
  opacity: 0.35;
  transition: opacity 0.25s ease;
}

.wave.is-playing {
  opacity: 1;
}

.wave span {
  width: 0.4rem;
  height: 30%;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--amber-hot), var(--teal));
  transform-origin: bottom;
}

.wave.is-playing span {
  animation: pulse 0.9s ease-in-out infinite;
}

.wave span:nth-child(2) { animation-delay: 0.08s; }
.wave span:nth-child(3) { animation-delay: 0.16s; }
.wave span:nth-child(4) { animation-delay: 0.24s; }
.wave span:nth-child(5) { animation-delay: 0.32s; }

.stage[hidden],
.meter[hidden],
.field[hidden] {
  display: none !important;
}

.meter {
  display: grid;
  gap: 0.85rem;
  padding: 1.2rem 1.25rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    linear-gradient(160deg, rgba(47, 111, 106, 0.18), transparent 50%),
    rgba(18, 26, 31, 0.7);
  box-shadow: var(--shadow);
  animation: rise 0.7s ease 0.22s both;
}

.meter__labels {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--mist);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.meter__labels span:first-child { justify-self: start; }
.meter__labels span:last-child { justify-self: end; }

#meterVerdict {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-transform: none;
  color: var(--fog);
}

.meter.is-flat #meterVerdict { color: #7ec8ff; }
.meter.is-sharp #meterVerdict { color: #ff8b6a; }
.meter.is-ok #meterVerdict { color: #7ddea0; }
.meter.is-quiet #meterVerdict { color: var(--mist); }

.meter__track {
  position: relative;
  height: 18px;
  border-radius: 999px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 0.35fr 1fr;
  background: rgba(0, 0, 0, 0.35);
}

.meter__zone--flat {
  background: linear-gradient(90deg, rgba(126, 200, 255, 0.15), rgba(126, 200, 255, 0.35));
}

.meter__zone--ok {
  background: rgba(125, 222, 160, 0.45);
}

.meter__zone--sharp {
  background: linear-gradient(90deg, rgba(255, 139, 106, 0.35), rgba(255, 139, 106, 0.15));
}

.meter__center {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
  background: rgba(215, 224, 230, 0.55);
}

.meter__needle {
  position: absolute;
  top: -4px;
  bottom: -4px;
  left: 50%;
  width: 4px;
  margin-left: -2px;
  border-radius: 999px;
  background: var(--amber-hot);
  box-shadow: 0 0 12px rgba(240, 192, 106, 0.55);
  transform: translateX(0);
  transition: transform 0.08s linear;
}

.meter__cents {
  margin: 0;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--amber-hot);
}

.meter__detected {
  margin: 0;
  text-align: center;
  color: var(--mist);
  font-size: 0.95rem;
}

.mic-toggle {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  color: #1a1205;
  background: linear-gradient(180deg, rgba(224, 160, 58, 0.95), rgba(184, 120, 30, 0.95));
  transition: transform 0.15s ease, filter 0.15s ease;
}

.mic-toggle:hover { filter: brightness(1.05); }
.mic-toggle:active { transform: scale(0.98); }

.mic-toggle.is-on {
  color: var(--fog);
  background: rgba(255, 139, 106, 0.2);
  border-color: rgba(255, 139, 106, 0.55);
}

.string.is-matched {
  border-color: rgba(125, 222, 160, 0.75);
  background: linear-gradient(90deg, rgba(125, 222, 160, 0.14), rgba(28, 42, 51, 0.7));
}

.strings {
  display: grid;
  gap: 0.65rem;
  animation: rise 0.7s ease 0.28s both;
}

.string {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.95rem 1.1rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.9rem;
  text-align: left;
  color: inherit;
  font: inherit;
  cursor: pointer;
  background: rgba(28, 42, 51, 0.55);
  transition: transform 0.15s ease, border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.string:hover {
  border-color: rgba(224, 160, 58, 0.45);
  transform: translateY(-1px);
}

.string:active {
  transform: translateY(0);
}

.string.is-active {
  border-color: rgba(224, 160, 58, 0.8);
  background: linear-gradient(90deg, rgba(224, 160, 58, 0.18), rgba(28, 42, 51, 0.7));
  box-shadow: 0 0 0 1px rgba(224, 160, 58, 0.2), 0 12px 30px rgba(0, 0, 0, 0.25);
}

.string__idx {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #1a1205;
  background: var(--amber);
}

.string__name {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.string__meta {
  display: block;
  margin-top: 0.15rem;
  color: var(--mist);
  font-size: 0.85rem;
}

.string__freq {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--amber-hot);
}

.footer {
  color: var(--mist);
  font-size: 0.88rem;
  text-align: center;
}

.footer p {
  margin: 0;
}

kbd {
  display: inline-block;
  padding: 0.1rem 0.4rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.3);
  font-family: var(--font-body);
  font-size: 0.8rem;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    height: 28%;
  }
  50% {
    height: 100%;
  }
}

/* Song / chords sheet */
.song {
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  height: calc(100dvh - 4.2rem);
  max-height: calc(100vh - 4.2rem);
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 0.45rem;
  padding: 0.7rem 0.85rem 0.8rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(18, 26, 31, 0.78);
  overflow: hidden;
}

.song__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--line);
}

.song__head-main {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  min-width: 0;
}

.song__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.song__meta {
  margin: 0;
  color: var(--amber-hot);
  font-size: 0.78rem;
  font-weight: 600;
}

.zoom {
  display: inline-grid;
  grid-template-columns: auto auto auto;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem;
  border-radius: 11px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line);
  flex-shrink: 0;
}

.zoom__btn {
  appearance: none;
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
  color: #1a1205;
  background: linear-gradient(180deg, rgba(224, 160, 58, 0.95), rgba(184, 120, 30, 0.95));
  cursor: pointer;
}

.zoom__btn:hover {
  filter: brightness(1.06);
}

.zoom__btn:active {
  transform: scale(0.96);
}

.zoom__btn:disabled {
  opacity: 0.4;
  cursor: default;
  filter: none;
}

.zoom__value {
  min-width: 3.2rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--fog);
}

.song__cols {
  --song-zoom: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem 1.1rem;
  min-height: 0;
  overflow: auto;
}

.song__col {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
}

.song__block {
  display: grid;
  gap: 0.12rem;
}

.song__label {
  margin: 0 0 0.1rem;
  font-size: calc(0.68rem * var(--song-zoom, 1));
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
}

.song__pre {
  margin: 0;
  font-family: var(--mono);
  font-size: calc(clamp(0.58rem, 1.05vh, 0.78rem) * var(--song-zoom, 1));
  line-height: 1.25;
  color: var(--amber-hot);
  white-space: pre-wrap;
}

.cline {
  display: grid;
  gap: 0;
  line-height: 1.15;
}

.ch,
.ly {
  font-family: var(--mono);
  font-size: calc(clamp(0.56rem, 1.05vh, 0.76rem) * var(--song-zoom, 1));
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.ch {
  color: var(--amber-hot);
  font-weight: 600;
}

.ly {
  color: var(--fog);
}

@media (max-width: 900px) {
  .song {
    height: auto;
    max-height: none;
    overflow: auto;
  }

  .song__cols {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .ch,
  .ly,
  .song__pre {
    font-size: 0.78rem;
  }
}

@media (max-width: 560px) {
  .app {
    width: min(100% - 1.25rem, 720px);
    padding-top: 1.6rem;
  }

  .stage {
    grid-template-columns: 1fr;
  }

  .wave {
    justify-content: start;
  }

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

  .string__freq {
    grid-column: 2;
  }

  .brand__row {
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}