/* ============================================
   STRUMENTI: Metronomo + Accordatore + DrumMachine
   Identico nell'app docente e nell'app utente (vedi js/strumenti.js)
   ============================================ */

.stru-modal {
    /* Colore principale: ogni app può ridefinirlo nel suo app.css */
    --stru-primario: var(--bs-primary, #0d6efd);
    --stru-ok: #27ae60;
    --stru-vicino: #f39c12;
    --stru-lontano: #e74c3c;
    --stru-accento: #e67e22;
    --stru-tenue: #adb5bd;
}

.stru-modal .modal-header {
    padding: .5rem .75rem;
    padding-top: calc(.5rem + env(safe-area-inset-top, 0px));
}
.stru-modal .modal-body {
    padding: 1rem;
    padding-bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
}
@media (min-width: 576px) {
    .stru-modal .modal-header { padding-top: .5rem; }
    .stru-modal .modal-dialog { max-width: 440px; }
}

/* Testata su due righe: titolo e chiusura sopra, le tre schede sotto */
.stru-modal .stru-testata { flex-direction: column; align-items: stretch; gap: .5rem; }
.stru-testata-alto { display: flex; align-items: center; justify-content: space-between; }
.stru-testata .modal-title { font-size: 1rem; font-weight: 600; }
.stru-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    padding: 3px;
    border-radius: .6rem;
    background: var(--bs-tertiary-bg, #f1f3f5);
}
.stru-tab {
    min-width: 0;
    border: 0;
    background: none;
    padding: .4rem .25rem;
    border-radius: .5rem;
    font-size: .875rem;
    color: var(--bs-secondary-color, #6c757d);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.stru-tab.active { background: var(--stru-primario); color: #fff; font-weight: 600; }

.stru-pane { display: flex; flex-direction: column; gap: 1rem; }

/* ---- Metronomo ---- */
.stru-display {
    position: relative;
    text-align: center;
    padding: 1.25rem 0 1rem;
    border-radius: 1rem;
    background: var(--bs-tertiary-bg, #f8f9fa);
    overflow: hidden;
}
.stru-lampo {
    position: absolute;
    inset: 0;
    opacity: 0;
    pointer-events: none;
    background: var(--stru-primario);
}
.stru-lampo.flash { animation: stru-flash .18s ease-out; }
.stru-lampo.flash-accento { background: var(--stru-accento); animation: stru-flash .22s ease-out; }
@keyframes stru-flash {
    from { opacity: .22; }
    to   { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
    .stru-lampo.flash, .stru-lampo.flash-accento { animation: none; }
}

.stru-bpm {
    position: relative;
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}
.stru-bpm small {
    display: block;
    font-size: .8rem;
    font-weight: 600;
    letter-spacing: .1em;
    color: var(--bs-secondary-color, #6c757d);
    margin-top: .25rem;
}
.stru-tempo-nome {
    position: relative;
    font-style: italic;
    color: var(--bs-secondary-color, #6c757d);
    margin-top: .25rem;
}
.stru-pallini {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .5rem;
    margin-top: 1rem;
    padding: 0 1rem;
}
.stru-pallino {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bs-border-color, #dee2e6);
    transition: background .06s, transform .06s;
}
.stru-pallino.primo { box-shadow: 0 0 0 2px var(--stru-accento) inset; }
.stru-pallino.on { background: var(--stru-primario); transform: scale(1.25); }
.stru-pallino.primo.on { background: var(--stru-accento); }

.stru-bpm-controlli {
    display: flex;
    align-items: center;
    gap: .35rem;
}
.stru-bpm-controlli .btn { min-width: 44px; padding-left: .4rem; padding-right: .4rem; font-variant-numeric: tabular-nums; }
.stru-bpm-controlli .form-range { flex: 1; min-width: 0; }

.stru-azioni { display: flex; gap: .5rem; }
.stru-azioni .btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    min-height: 56px;
    font-size: 1.05rem;
    font-weight: 600;
}
.stru-azioni .btn i { font-size: 1.4rem; }
.stru-tap {
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
}
.stru-tap {
    --bs-btn-color: var(--stru-primario);
    --bs-btn-border-color: var(--stru-primario);
    --bs-btn-hover-bg: var(--stru-primario);
    --bs-btn-hover-border-color: var(--stru-primario);
    --bs-btn-active-bg: var(--stru-primario);
    --bs-btn-active-border-color: var(--stru-primario);
}
.stru-tap:active { transform: scale(.97); }
.stru-play {
    --stru-play-colore: var(--stru-primario);
    --bs-btn-bg: var(--stru-play-colore);
    --bs-btn-border-color: var(--stru-play-colore);
    --bs-btn-hover-bg: var(--stru-play-colore);
    --bs-btn-hover-border-color: var(--stru-play-colore);
    --bs-btn-active-bg: var(--stru-play-colore);
    --bs-btn-active-border-color: var(--stru-play-colore);
}
/* Anche diretto: l'app utente colora .btn-primary senza passare dalle variabili */
.stru-play, .stru-play:hover, .stru-play:focus { background-color: var(--stru-play-colore); border-color: var(--stru-play-colore); }
.stru-play.in-corso { --stru-play-colore: var(--stru-lontano); }

.stru-impostazioni {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--bs-border-color, #dee2e6);
    border-radius: .75rem;
}
.stru-riga {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .6rem .85rem;
    min-height: 52px;
}
.stru-riga + .stru-riga { border-top: 1px solid var(--bs-border-color, #dee2e6); }
.stru-riga label { margin: 0; }
.stru-stepper { display: flex; align-items: center; gap: .6rem; }
.stru-stepper strong { min-width: 2.5ch; text-align: center; font-variant-numeric: tabular-nums; }
.stru-stepper .btn { width: 36px; height: 36px; padding: 0; }
.stru-sub { min-width: 40px; font-size: 1.05rem; }
.stru-volume { max-width: 55%; }

.stru-nota-ios {
    font-size: .8rem;
    color: var(--bs-secondary-color, #6c757d);
    text-align: center;
    margin: 0;
}

/* ---- Accordatore ---- */
.stru-tuner {
    text-align: center;
    padding: 1.25rem 1rem 1rem;
    border-radius: 1rem;
    background: var(--bs-tertiary-bg, #f8f9fa);
    --stru-colore: var(--stru-lontano);
}
.stru-tuner.vicino   { --stru-colore: var(--stru-vicino); }
.stru-tuner.intonato { --stru-colore: var(--stru-ok); }
.stru-tuner.muto     { --stru-colore: var(--stru-tenue); }

.stru-nota-box { line-height: 1; min-height: 5rem; }
.stru-nota {
    font-size: 5rem;
    font-weight: 700;
    color: var(--stru-colore);
    transition: color .15s;
}
.stru-ottava {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--bs-secondary-color, #6c757d);
    bottom: 0;
}
.stru-nota-en {
    min-height: 1.25rem;
    font-size: .85rem;
    color: var(--bs-secondary-color, #6c757d);
}

.stru-scala {
    position: relative;
    height: 56px;
    margin: 1.25rem .5rem 0;
}
.stru-zona {
    position: absolute;
    top: 8px;
    bottom: 8px;
    left: 45%;
    width: 10%;
    border-radius: 4px;
    background: var(--stru-ok);
    opacity: .18;
}
.stru-tacca {
    position: absolute;
    top: 18px;
    bottom: 18px;
    width: 2px;
    margin-left: -1px;
    background: var(--bs-border-color, #ced4da);
}
.stru-tacca.zero { top: 6px; bottom: 6px; background: var(--bs-secondary-color, #6c757d); }
.stru-ago {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    margin-left: -2px;
    border-radius: 2px;
    background: var(--stru-colore);
    transition: left .12s ease-out, background .15s;
}
.stru-tuner.muto .stru-ago { opacity: .35; }
.stru-scala-label {
    display: flex;
    justify-content: space-between;
    font-size: .75rem;
    color: var(--bs-secondary-color, #6c757d);
    margin: .25rem .25rem 0;
}
.stru-cents {
    min-height: 1.75rem;
    margin-top: .75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--stru-colore);
    font-variant-numeric: tabular-nums;
}
.stru-tuner.muto .stru-cents { font-size: 1rem; font-weight: 400; color: var(--bs-secondary-color, #6c757d); }
.stru-hz {
    min-height: 1.25rem;
    font-size: .85rem;
    color: var(--bs-secondary-color, #6c757d);
    font-variant-numeric: tabular-nums;
}

/* ---- Accordatore: strumento e corde ---- */
.stru-select { width: auto; max-width: 60%; }
.stru-corde-box { margin-top: .75rem; }
.stru-corde {
    display: flex;
    justify-content: center;
    gap: .4rem;
    flex-wrap: wrap;
}
.stru-corda {
    position: relative;
    min-width: 48px;
    height: 44px;
    padding: 0 .5rem;
    border: 2px solid var(--bs-border-color, #dee2e6);
    border-radius: .6rem;
    background: var(--bs-body-bg, #fff);
    color: var(--bs-body-color, #212529);
    font-weight: 600;
    font-size: .95rem;
    line-height: 1;
    transition: border-color .15s, background .15s, color .15s;
}
.stru-corda sub { font-size: .65rem; font-weight: 500; color: var(--bs-secondary-color, #6c757d); }
/* La corda che si sta accordando prende il colore dell'ago */
.stru-corda.attiva { border-color: var(--stru-colore); color: var(--stru-colore); }
.stru-corda.intonata { background: var(--stru-ok); border-color: var(--stru-ok); color: #fff; }
.stru-corda.intonata sub { color: rgba(255, 255, 255, .85); }
/* Fissata a mano: bordo tratteggiato */
.stru-corda.fissa { border-style: dashed; }
/* Già portata in tono in questa sessione */
.stru-corda.fatta::after {
    content: '✓';
    position: absolute;
    top: -7px;
    right: -6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--stru-ok);
    color: #fff;
    font-size: .6rem;
    line-height: 16px;
}
.stru-corde-aiuto {
    margin-top: .35rem;
    font-size: .75rem;
    color: var(--bs-secondary-color, #6c757d);
}

/* ---- DrumMachine ---- */
.stru-drum-display {
    display: flex;
    flex-direction: column;
    gap: .65rem;
    padding: .9rem .75rem .75rem;
    border-radius: 1rem;
    background: var(--bs-tertiary-bg, #f8f9fa);
}
.stru-drum-alto { display: flex; align-items: flex-start; justify-content: space-between; gap: .75rem; }
.stru-drum-nome { font-size: 1.25rem; font-weight: 700; line-height: 1.2; }
.stru-drum-info { font-size: .8rem; color: var(--bs-secondary-color, #6c757d); }
.stru-drum-bpm {
    flex-shrink: 0;
    text-align: right;
    font-size: 2.1rem;
    font-weight: 700;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}
.stru-drum-bpm small {
    display: block;
    font-size: .7rem;
    font-weight: 600;
    letter-spacing: .1em;
    color: var(--bs-secondary-color, #6c757d);
}

/* Griglia dei passi: una riga per pezzo, i passi raggruppati per battito */
.stru-griglia { display: flex; flex-direction: column; gap: .6rem; }
.stru-battuta { display: grid; grid-template-columns: 62px minmax(0, 1fr); row-gap: 5px; align-items: center; }
.stru-pezzo { font-size: .7rem; color: var(--bs-secondary-color, #6c757d); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.stru-passi { display: flex; gap: 6px; min-width: 0; }
.stru-battito { display: flex; gap: 2px; flex: 1; min-width: 0; }
.stru-cella {
    position: relative;
    flex: 1;
    min-width: 0;
    height: 18px;
    border-radius: 4px;
    background: var(--bs-secondary-bg, #e9ecef);
    transition: transform .05s;
}
.stru-cella.on { background: var(--stru-primario); }
.stru-cella.acc { background: var(--stru-primario); box-shadow: inset 0 0 0 2px var(--stru-accento); }
.stru-cella.ghost { background: transparent; box-shadow: inset 0 0 0 1.5px var(--stru-primario); }
.stru-cella.open { background: transparent; box-shadow: inset 0 0 0 2px var(--stru-primario); border-radius: 50%; }
.stru-cella.rim::after, .stru-cella.pedal::after {
    content: "";
    position: absolute;
    inset: 4px 30%;
    border-radius: 2px;
    background: #fff;
    opacity: .85;
}
.stru-cella.pedal::after { inset: 30% 20%; }
.stru-cella.ora { outline: 2px solid var(--bs-body-color, #212529); outline-offset: -1px; }
.stru-cella.ora.on, .stru-cella.ora.acc, .stru-cella.ora.ghost, .stru-cella.ora.open { transform: scaleY(1.25); }
.stru-conteggio { display: flex; gap: 6px; padding-left: 62px; }
.stru-conteggio span { flex: 1; min-width: 0; font-size: .65rem; color: var(--bs-secondary-color, #6c757d); white-space: nowrap; overflow: hidden; }

.stru-legenda { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: .7rem; color: var(--bs-secondary-color, #6c757d); }
.stru-legenda span { display: inline-flex; align-items: center; gap: 5px; }
.stru-legenda .stru-cella { flex: none; width: 14px; height: 12px; }

.stru-drum-stato { min-height: 1.25rem; font-size: .8rem; color: var(--bs-secondary-color, #6c757d); font-variant-numeric: tabular-nums; }
.stru-drum-stato.conto { color: var(--stru-accento); font-weight: 700; font-size: .95rem; }

.stru-sezione {
    font-size: .7rem;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--bs-secondary-color, #6c757d);
    margin-bottom: .4rem;
}
.stru-generi { display: flex; flex-direction: column; gap: .6rem; }
.stru-genere { font-size: .75rem; color: var(--bs-secondary-color, #6c757d); margin-bottom: .3rem; }
.stru-ritmi { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 6px; }
.stru-ritmo {
    display: flex;
    flex-direction: column;
    gap: 1px;
    text-align: left;
    padding: .45rem .6rem;
    border: 1px solid var(--bs-border-color, #dee2e6);
    border-radius: .5rem;
    background: var(--bs-body-bg, #fff);
    color: var(--bs-body-color, #212529);
    font-size: .9rem;
}
.stru-ritmo small { font-size: .7rem; color: var(--bs-secondary-color, #6c757d); font-variant-numeric: tabular-nums; }
.stru-ritmo.scelto { border-color: var(--stru-primario); box-shadow: inset 0 0 0 1px var(--stru-primario); font-weight: 600; }
/* Scelto mentre suona: entra alla prossima battuta */
.stru-ritmo.in-attesa { border-style: dashed; border-color: var(--stru-primario); }

.stru-riga label small { display: block; font-size: .7rem; color: var(--bs-secondary-color, #6c757d); }
.stru-riga.disattiva { opacity: .5; }

@media (prefers-reduced-motion: reduce) {
    .stru-cella { transition: none; }
    .stru-cella.ora.on, .stru-cella.ora.acc, .stru-cella.ora.ghost, .stru-cella.ora.open { transform: none; }
}

/* ---- DrumMachine: il ritmo si scrive toccando i quadratini ---- */
.stru-drum-modifica { align-self: flex-start; }
.stru-drum-modifica.attivo { background: var(--stru-primario); border-color: var(--stru-primario); color: #fff; }
button.stru-cella { appearance: none; -webkit-appearance: none; border: 0; padding: 0; cursor: pointer; }
/* Celle grandi da toccare: sui telefoni stretti la griglia scorre di lato */
.stru-griglia.modifica { overflow-x: auto; padding-bottom: 4px; -webkit-overflow-scrolling: touch; }
.stru-griglia.modifica .stru-battuta,
.stru-griglia.modifica .stru-conteggio { min-width: calc(62px + var(--passi, 16) * 22px); }
.stru-griglia.modifica .stru-cella { height: 30px; min-width: 18px; }
.stru-griglia.modifica .stru-cella:not(.on):not(.acc):not(.ghost):not(.open):hover { background: var(--bs-tertiary-bg, #dee2e6); }

.stru-modifica { display: flex; flex-direction: column; gap: .55rem; padding: .65rem; border: 1px dashed var(--stru-primario); border-radius: .5rem; }
.stru-modifica[hidden] { display: none; }
.stru-modifica-aiuto { font-size: .75rem; color: var(--bs-secondary-color, #6c757d); }
.stru-modifica-avviso { font-size: .8rem; font-weight: 600; color: var(--stru-primario); }
.stru-modifica-righe { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem .9rem; }
.stru-modifica-righe input { flex: 1 1 140px; min-width: 0; }
.stru-modifica-campo { display: flex; align-items: center; gap: .4rem; font-size: .8rem; }
.stru-modifica-campo > span:first-child { color: var(--bs-secondary-color, #6c757d); }
.stru-battiti { display: flex; align-items: center; gap: .35rem; }
#stru-mod-battiti { min-width: 1.4em; text-align: center; font-weight: 700; font-variant-numeric: tabular-nums; }
.stru-ritmo.stru-nuovo { border-style: dashed; color: var(--stru-primario); }
.stru-ritmo.stru-nuovo span { display: flex; align-items: center; gap: .3rem; font-weight: 600; }