/* Base — stile. Carta bianca, inchiostro nero, un rosso segnale. Le parole sono interruttori,
   le targhe sono gli accordi, il rosso vuol dire «adesso». Nessuna ombra, nessun gradiente. */

:root {
  --carta: #ffffff;
  --inchiostro: #000000;
  --grigio: #767676;
  --linea: #d9d9d9;
  --segnale: #d0311b;
  --su-targa: #ffffff;
  --gutter: 16px;
  --famiglia: "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  --condensata: "HelveticaNeue-CondensedBlack", "HelveticaNeue-CondensedBold", "Helvetica Neue", "Arial Narrow", Bahnschrift, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --carta: #000000;
    --inchiostro: #ffffff;
    --grigio: #8c8c8c;
    --linea: #333333;
    --su-targa: #000000;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--carta);
  color: var(--inchiostro);
  font-family: var(--famiglia);
  font-size: 17px;
  line-height: 1.25;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.app {
  max-width: 480px;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + 12px) var(--gutter) calc(env(safe-area-inset-bottom) + 16px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  margin: 0;
  cursor: pointer;
  touch-action: manipulation;
}
button:focus-visible, input:focus-visible { outline: 3px solid var(--segnale); outline-offset: 3px; }

.numero {
  font-family: var(--condensata);
  font-stretch: condensed;
  font-weight: 900;
  letter-spacing: -0.015em;
  font-variant-numeric: tabular-nums lining-nums;
}

/* --- testa: play, bpm, battito ---------------------------------------- */
.testa {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  align-items: end;
  gap: 14px;
}
.play {
  width: 72px;
  height: 72px;
  background: var(--inchiostro);
  color: var(--su-targa);
  display: grid;
  place-items: center;
}
.play svg { width: 30px; height: 30px; fill: currentColor; }
.play .ico-stop { display: none; }
.play[aria-pressed="true"] .ico-play { display: none; }
.play[aria-pressed="true"] .ico-stop { display: block; }
.play[aria-pressed="true"] { background: var(--segnale); color: #fff; }
.play:disabled { opacity: 0.4; cursor: wait; }

.tempo { display: flex; flex-direction: column; gap: 6px; }
.bpm { display: flex; align-items: baseline; gap: 6px; line-height: 0.9; }
.bpm .numero { font-size: 64px; }
.bpm .unita { font-size: 15px; color: var(--grigio); }
.battito { display: flex; gap: 6px; }
.battito i { display: block; width: 14px; height: 4px; background: var(--linea); }
.battito i.on { background: var(--inchiostro); }
.battito i.uno.on { background: var(--segnale); }
.marchio { font-size: 15px; color: var(--grigio); align-self: start; }

/* --- parole-interruttore ------------------------------------------------ */
.parole { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.parola {
  font-size: 19px;
  font-weight: 700;
  color: var(--grigio);
  padding: 8px 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.parola.on { color: var(--inchiostro); }
.voci .parola:not(.on) { text-decoration: line-through; text-decoration-thickness: 2px; }
.generi .parola { font-size: 22px; }
.generi .parola small { font-weight: 400; font-size: 13px; color: var(--grigio); margin-left: 6px; }
.generi .parola:not(.on) small { display: none; }

.voci-riga { display: flex; justify-content: space-between; align-items: center; gap: 12px; border-top: 1px solid var(--linea); padding-top: 4px; }
.voci-riga #vivo.on { color: var(--segnale); }

/* --- cursori ------------------------------------------------------------ */
.cursori { display: flex; flex-direction: column; gap: 2px; border-top: 1px solid var(--linea); padding-top: 8px; }
.cursore { display: grid; grid-template-columns: 56px 1fr 56px; align-items: center; gap: 10px; min-height: 40px; }
.cursore .etichetta { font-size: 15px; color: var(--grigio); }
.cursore output { font-size: 15px; text-align: right; font-variant-numeric: tabular-nums; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 40px;
  background: transparent;
  margin: 0;
}
input[type="range"]::-webkit-slider-runnable-track { height: 2px; background: var(--linea); }
input[type="range"]::-moz-range-track { height: 2px; background: var(--linea); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px;
  margin-top: -10px;
  background: var(--inchiostro);
  border: 0;
  border-radius: 0;
}
input[type="range"]::-moz-range-thumb { width: 22px; height: 22px; background: var(--inchiostro); border: 0; border-radius: 0; }

/* --- il giro: quattro targhe ---------------------------------------------- */
.giro { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.targa {
  aspect-ratio: 1 / 1.15;
  background: var(--inchiostro);
  color: var(--su-targa);
  display: grid;
  place-items: center;
  position: relative;
  font-size: 30px;
  line-height: 1;
  padding: 4px;
  overflow: hidden;
  word-break: break-all;
}
.targa.vuota { background: none; color: var(--grigio); box-shadow: inset 0 0 0 2px var(--linea); }
.targa.vuota::before { content: "+"; font-size: 36px; font-weight: 400; }
.targa.dubbia { background: var(--grigio); }
.targa.suona { background: var(--segnale); color: #fff; }
.targa.scelta::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 5px; background: var(--segnale); }
.targa.suona.scelta::after { background: #fff; }

/* --- accordo corrente e manico ------------------------------------------- */
.accordo { display: flex; align-items: baseline; gap: 14px; min-height: 52px; }
.accordo-nome { font-size: 52px; line-height: 0.9; min-width: 60px; }
.accordo-note { color: var(--grigio); font-size: 15px; }

.manico-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  touch-action: pan-x;
  margin: 0 calc(-1 * var(--gutter));
  padding: 0 var(--gutter);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.manico-scroll::-webkit-scrollbar { display: none; }
.manico { display: block; color: var(--inchiostro); }
.manico .fret { stroke: var(--linea); stroke-width: 1.5; }
.manico .nut { fill: var(--inchiostro); }
.manico .string { stroke: var(--inchiostro); stroke-linecap: round; }
.manico .marker { fill: var(--linea); }
.manico .dot { fill: var(--inchiostro); }
.manico .open { fill: var(--carta); stroke: var(--inchiostro); stroke-width: 2.5; }
.manico .mute { fill: var(--grigio); font-size: 18px; font-weight: 700; text-anchor: middle; }
.manico .string-name { fill: var(--grigio); font-size: 12px; font-weight: 700; text-anchor: middle; }
.manico .fret-num { fill: var(--grigio); font-size: 11px; text-anchor: middle; }
.manico .cell { cursor: pointer; }

/* --- azioni in fondo ------------------------------------------------------- */
.azioni { display: flex; align-items: center; gap: 22px; border-top: 1px solid var(--linea); padding-top: 4px; }
.azioni .parola { font-size: 16px; color: var(--inchiostro); font-weight: 500; }
.azioni .stato { margin-left: auto; font-size: 13px; color: var(--grigio); text-align: right; }

@media (prefers-reduced-motion: no-preference) {
  .targa, .play, .battito i { transition: background-color 80ms linear; }
}
@media (max-height: 740px) {
  .bpm .numero { font-size: 52px; }
  .accordo-nome { font-size: 44px; }
  .app { gap: 10px; }
}