:root{
  --ink:#1b2430;
  --ink2:#232f3d;
  --ink3:#2c3947;
  --paper:#efe9de;
  --paper2:#e4dcc8;
  --brass:#c79a5c;
  --brass2:#e4bd7e;
  --text:#eeeae1;
  --muted:#8fa0af;
  --line:rgba(238,234,225,.10);
  --danger:#9f4747;
  --sidebar:360px;
}

*{box-sizing:border-box}
html,body{height:100%;overscroll-behavior:none}
body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:Arial,Helvetica,sans-serif;
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
}
button,input{font:inherit}

#app{
  width:100%;
  height:100vh;
  height:100dvh;
  display:flex;
  position:relative;
  overflow:hidden;
}

/* ===== LISTA DE CANCIONES ===== */
.library-screen{
  width:var(--sidebar);
  flex:0 0 var(--sidebar);
  height:100%;
  display:flex;
  flex-direction:column;
  background:linear-gradient(180deg,var(--ink2),var(--ink));
  border-right:1px solid var(--line);
  position:relative;
  z-index:4;
}

.library-head{
  padding:calc(env(safe-area-inset-top,0px) + 24px) 22px 16px;
  border-bottom:1px solid var(--line);
  flex:0 0 auto;
}

.eyebrow{
  margin:0 0 6px;
  color:var(--brass);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
}

.library-head h1{
  margin:0 0 15px;
  font-family:Georgia,'Times New Roman',serif;
  font-size:28px;
  line-height:1.08;
  color:var(--text);
}

.search-wrap{
  display:flex;
  align-items:center;
  gap:9px;
  background:var(--ink3);
  border:1px solid var(--line);
  border-radius:10px;
  padding:11px 13px;
}

.search-wrap svg{
  width:17px;
  height:17px;
  color:var(--muted);
  flex:0 0 auto;
}

.search-box{
  width:100%;
  min-width:0;
  padding:0;
  border:0;
  outline:0;
  background:transparent;
  color:#fff;
  font-size:16px;
}

.search-box::placeholder{color:var(--muted)}

.library-meta{
  display:flex;
  justify-content:space-between;
  gap:10px;
  margin-top:11px;
  color:var(--muted);
  font-size:12px;
}

.song-list{
  flex:1;
  min-height:0;
  overflow-y:auto;
  -webkit-overflow-scrolling:touch;
  padding:8px 0 28px;
}

.song-list::-webkit-scrollbar{width:6px}
.song-list::-webkit-scrollbar-thumb{
  background:var(--ink3);
  border-radius:999px;
}

.song-item{
  width:100%;
  min-height:64px;
  display:flex;
  align-items:center;
  gap:13px;
  padding:12px 20px;
  border:0;
  border-left:4px solid transparent;
  background:transparent;
  color:var(--text);
  text-align:left;
  cursor:pointer;
  transition:background .16s ease,border-color .16s ease;
}

.song-item:hover{background:rgba(255,255,255,.045)}
.song-item.active{
  background:rgba(199,154,92,.11);
  border-left-color:var(--brass);
}

.song-number{
  width:28px;
  flex:0 0 28px;
  color:var(--muted);
  font-size:12px;
  font-variant-numeric:tabular-nums;
}

.song-item.active .song-number{color:var(--brass)}

.music-icon{
  width:35px;
  height:35px;
  flex:0 0 35px;
  display:grid;
  place-items:center;
  border:1px solid var(--line);
  border-radius:50%;
  color:var(--brass);
  background:rgba(0,0,0,.12);
}

/* ===== BOTON DE INFORMACION DE CADA LECCION ===== */
.info-button{
  cursor:pointer;
  font-family:Georgia,'Times New Roman',serif;
  font-size:18px;
  font-weight:900;
  font-style:italic;
  transition:transform .15s ease,background .15s ease,border-color .15s ease,color .15s ease;
}

.info-button:hover,
.info-button:focus-visible{
  transform:scale(1.08);
  background:var(--brass);
  border-color:var(--brass2);
  color:var(--ink);
  outline:none;
}

.song-info{min-width:0;flex:1}

.song-title{
  display:block;
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
  font-family:Georgia,'Times New Roman',serif;
  font-size:16px;
  font-weight:bold;
}

.song-format{
  display:block;
  margin-top:3px;
  color:var(--muted);
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:.09em;
}

.empty-list{
  padding:28px 22px;
  color:var(--muted);
  font-size:14px;
  line-height:1.5;
}

.status{
  min-height:46px;
  flex:0 0 auto;
  padding:12px 20px calc(env(safe-area-inset-bottom,0px) + 12px);
  border-top:1px solid var(--line);
  color:var(--brass2);
  font-size:12px;
  line-height:1.4;
}

/* ===== PLAYER ===== */
.player-screen{
  flex:1;
  min-width:0;
  height:100%;
  display:flex;
  flex-direction:column;
  background:#151c25;
  position:relative;
  z-index:3;
}

.player-head{
  flex:0 0 auto;
  padding:calc(env(safe-area-inset-top,0px) + 18px) 24px 14px;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,#202b38,#1b2430);
}

.back-btn{
  display:none;
  align-items:center;
  gap:7px;
  margin:0 0 12px;
  padding:8px 12px;
  border:1px solid rgba(199,154,92,.45);
  border-radius:8px;
  background:transparent;
  color:var(--brass2);
  font-weight:bold;
  cursor:pointer;
}

.player-heading{
  display:flex;
  justify-content:space-between;
  gap:16px;
  align-items:flex-end;
  margin-bottom:13px;
}

.player-heading h2{
  min-width:0;
  margin:0;
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
  font-family:Georgia,'Times New Roman',serif;
  font-size:clamp(21px,3vw,30px);
  color:var(--text);
}

.player-heading .mini{
  flex:0 0 auto;
  color:var(--muted);
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:.12em;
}

.player-bar{
  display:flex;
  align-items:center;
  gap:11px;
  padding:9px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--ink3);
}

.play-btn,.stop-btn{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  border:0;
  border-radius:50%;
  cursor:pointer;
}

.play-btn{
  width:46px;
  height:46px;
  background:var(--brass);
  color:var(--ink);
  font-size:20px;
  font-weight:bold;
}

.stop-btn{
  width:38px;
  height:38px;
  background:#202833;
  border:1px solid var(--line);
  color:#fff;
}

.play-btn:disabled,.stop-btn:disabled{
  opacity:.38;
  cursor:not-allowed;
}

.time-info{
  min-width:150px;
  flex:1;
}

.song-label{
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
  margin-bottom:7px;
  color:var(--text);
  font-size:13px;
  font-weight:bold;
}

.time-bar-bg{
  height:13px;
  position:relative;
  border-radius:999px;
  background:#18202a;
  cursor:pointer;
  touch-action:none;
}

.time-bar-fill{
  height:100%;
  width:0;
  border-radius:inherit;
  background:linear-gradient(90deg,var(--brass),var(--brass2));
  pointer-events:none;
}

.time-knob{
  position:absolute;
  top:50%;
  left:0;
  width:18px;
  height:18px;
  border:3px solid var(--brass);
  border-radius:50%;
  background:#fff;
  transform:translate(-50%,-50%);
  pointer-events:none;
}

.times{
  display:flex;
  justify-content:space-between;
  margin-top:4px;
  color:var(--muted);
  font-size:10px;
}

/* ===== LEVEL PROGRESS BAR ===== */
.level-progress{
  flex:0 0 auto;
  display:flex;
  flex-direction:column;
  gap:5px;
  min-width:170px;
  max-width:200px;
}
.level-progress-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.level-progress-label{
  color:var(--brass);
  font-size:10px;
  font-weight:800;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.level-progress-num{
  color:var(--brass2);
  font-size:11px;
  font-weight:900;
  font-variant-numeric:tabular-nums;
}
.level-progress-track{
  width:100%;
  height:12px;
  border-radius:999px;
  background:rgba(0,0,0,.45);
  border:1px solid rgba(238,234,225,.12);
  overflow:hidden;
}
.level-progress-fill{
  height:100%;
  width:0%;
  border-radius:inherit;
  background:linear-gradient(90deg,var(--brass),var(--brass2));
  transition:width .6s cubic-bezier(.4,0,.2,1);
  box-shadow:0 0 10px rgba(228,189,126,.45);
}

.tempo-row{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:7px;
  color:var(--muted);
  font-size:12px;
  white-space:nowrap;
}

.tempo-row input{
  width:120px;
  accent-color:var(--brass);
}

.tempo-value{
  min-width:42px;
  color:var(--brass2);
  font-weight:bold;
  text-align:right;
  font-variant-numeric:tabular-nums;
}

.metronome-btn{
  flex:0 0 auto;
  min-width:132px;
  padding:9px 13px;
  border:1px solid rgba(199,154,92,.45);
  border-radius:999px;
  background:#202833;
  color:var(--brass2);
  font-size:12px;
  font-weight:800;
  letter-spacing:.03em;
  cursor:pointer;
  transition:background .15s ease,color .15s ease,border-color .15s ease,transform .15s ease;
}

.metronome-btn:hover{
  border-color:var(--brass);
}

.metronome-btn:active{
  transform:scale(.97);
}

.metronome-btn.on{
  background:var(--brass);
  border-color:var(--brass2);
  color:var(--ink);
}

/* ===== PARTITURA ===== */
.score-shell{
  flex:1;
  min-height:0;
  margin:16px 22px 20px;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  border-radius:9px;
  background:var(--paper);
  box-shadow:0 18px 42px rgba(0,0,0,.34);
}

.score-toolbar{
  flex:0 0 auto;
  min-height:46px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:8px 12px;
  border-bottom:1px solid #d4c9b4;
  background:#e7decd;
  color:#3b342c;
  font-size:12px;
}

.score-toolbar button{
  min-width:38px;
  padding:7px 10px;
  border:1px solid #c5b99f;
  border-radius:7px;
  background:#f7f1e6;
  color:#2f2922;
  cursor:pointer;
}

#scoreViewport{
  flex:1;
  min-height:0;
  position:relative;
  overflow:auto;
  overscroll-behavior:contain;
  -webkit-overflow-scrolling:touch;
  background:#fff;
  scroll-behavior:auto;
}

#scoreCanvas{
  position:relative;
  min-width:0;
  padding:18px 14px 30px;
}

#score-placeholder{
  min-height:360px;
  display:grid;
  place-items:center;
  padding:25px;
  color:#8a8175;
  text-align:center;
  font-size:15px;
}

#osmd-score{
  display:none;
  position:relative;
  transform-origin:top left;
}

.osmdCursor{
  background-color:rgba(25,178,77,.13)!important;
  border-left:3px solid #18b64e!important;
  box-shadow:1px 0 8px rgba(24,182,78,.48)!important;
  opacity:1!important;
  pointer-events:none!important;
}

.loading-overlay{
  position:absolute;
  inset:0;
  z-index:8;
  display:none;
  align-items:center;
  justify-content:center;
  background:rgba(255,255,255,.90);
  color:#312b25;
  font-weight:bold;
}

.loading-overlay.show{display:flex}

.toast{
  position:fixed;
  left:50%;
  bottom:max(18px,env(safe-area-inset-bottom));
  z-index:999;
  max-width:calc(100% - 30px);
  padding:10px 18px;
  border-radius:999px;
  background:#177a40;
  color:#fff;
  font-size:13px;
  font-weight:bold;
  text-align:center;
  opacity:0;
  pointer-events:none;
  transform:translateX(-50%);
  transition:opacity .2s;
}

.toast.show{opacity:1}


/* ===== VENTANA EDUCATIVA ===== */
.lesson-modal{
  position:fixed;
  inset:0;
  z-index:2000;
  display:none;
  align-items:center;
  justify-content:center;
  padding:24px;
  background:rgba(10,15,22,.72);
  backdrop-filter:blur(5px);
  -webkit-backdrop-filter:blur(5px);
}

.lesson-modal.show{display:flex}

.lesson-modal-card{
  width:min(680px,94vw);
  max-height:min(76vh,720px);
  overflow:auto;
  position:relative;
  padding:34px 36px 32px;
  border-radius:18px;
  background:#fff;
  color:#20242a;
  text-align:left;
  box-shadow:0 28px 80px rgba(0,0,0,.48);
}

.lesson-modal-kicker{
  margin:0 46px 8px 0;
  color:#a6783f;
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  text-transform:uppercase;
}

.lesson-modal-title{
  margin:0 46px 18px 0;
  color:#1b2430;
  font-family:Georgia,'Times New Roman',serif;
  font-size:clamp(28px,5vw,42px);
  line-height:1.08;
}

.lesson-modal-body{
  color:#45413b;
  font-size:17px;
  line-height:1.65;
}

.lesson-modal-body p{margin:0 0 14px}
.lesson-modal-body p:last-child{margin-bottom:0}

.lesson-modal-close{
  position:absolute;
  top:16px;
  right:16px;
  width:42px;
  height:42px;
  display:grid;
  place-items:center;
  border:1px solid #ddd4c5;
  border-radius:50%;
  background:#f5f0e8;
  color:#312b25;
  font-size:25px;
  line-height:1;
  cursor:pointer;
}

.lesson-modal-close:hover{background:#e9dfcf}

@media(max-width:560px){
  .lesson-modal{padding:14px}
  .lesson-modal-card{padding:28px 22px 24px;border-radius:15px}
  .lesson-modal-body{font-size:16px}
}

/* ===== LEVELS BUTTON ===== */
.levels-btn{
  display:block;
  width:100%;
  margin-top:12px;
  padding:11px 14px;
  border:1px solid rgba(199,154,92,.45);
  border-radius:10px;
  background:rgba(199,154,92,.08);
  color:var(--brass2);
  font-size:13px;
  font-weight:800;
  letter-spacing:.06em;
  text-align:center;
  cursor:pointer;
  transition:background .15s,border-color .15s,transform .12s;
}
.levels-btn:hover{
  background:rgba(199,154,92,.18);
  border-color:var(--brass);
  transform:translateY(-1px);
}

/* ===== LEVELS OVERLAY ===== */
.levels-overlay{
  position:fixed;
  inset:0;
  z-index:2000;
  display:none;
  align-items:center;
  justify-content:center;
  padding:24px;
  background:rgba(10,15,22,.78);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.levels-overlay.show{display:flex}

.levels-card{
  width:min(560px,94vw);
  max-height:min(80vh,680px);
  overflow:auto;
  position:relative;
  padding:36px 38px 28px;
  border-radius:20px;
  background:#111a26;
  border:1px solid rgba(238,234,225,.10);
  box-shadow:0 30px 80px rgba(0,0,0,.55);
  color:var(--text);
}

.levels-close{
  position:absolute;
  top:16px;right:16px;
  width:40px;height:40px;
  display:grid;place-items:center;
  border:1px solid var(--line);
  border-radius:50%;
  background:#1b2430;
  color:var(--muted);
  font-size:22px;cursor:pointer;
}
.levels-close:hover{background:var(--ink3);color:var(--text)}

.levels-kicker{
  color:var(--brass);
  font-size:11px;font-weight:800;
  letter-spacing:.16em;text-transform:uppercase;
  margin-bottom:8px;
}
.levels-title{
  margin:0 40px 8px 0;
  font-family:Georgia,'Times New Roman',serif;
  font-size:clamp(24px,4vw,36px);
  line-height:1.08;
  color:var(--text);
}
.levels-sub{
  color:var(--muted);
  font-size:14px;
  margin:0 0 22px;
  line-height:1.5;
}

.levels-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
}

.level-btn{
  display:flex;
  align-items:center;
  gap:12px;
  padding:14px 16px;
  border:1px solid var(--line);
  border-radius:14px;
  background:#0d1520;
  color:var(--muted);
  text-align:left;
  cursor:pointer;
  transition:border-color .15s,background .15s,color .15s,transform .12s;
}
.level-btn:hover{
  border-color:var(--brass);
  background:rgba(199,154,92,.08);
  color:var(--text);
  transform:translateY(-1px);
}
.level-btn.active{
  border-color:var(--brass);
  background:rgba(199,154,92,.14);
  color:var(--brass2);
}
.level-btn-num{
  width:38px;height:38px;
  display:grid;place-items:center;
  border-radius:10px;
  background:#172034;
  color:var(--brass);
  font-size:13px;font-weight:900;
  flex-shrink:0;
}
.level-btn.active .level-btn-num{
  background:var(--brass);
  color:var(--ink);
}
.level-btn-label{
  font-size:13px;font-weight:700;
  line-height:1.3;
}

.levels-footer{
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid var(--line);
  color:var(--muted);
  font-size:12px;
  text-align:center;
}

.coming-soon-msg{
  padding:40px 20px;
  text-align:center;
  color:var(--muted);
  font-size:16px;
  font-weight:700;
  line-height:1.8;
}

/* ===== iPHONE / iPAD ===== */
@media(max-width:860px){
  :root{--sidebar:100%}

  .library-screen,
  .player-screen{
    position:absolute;
    top:0;
    width:100%;
    height:100%;
    transition:transform .34s cubic-bezier(.4,0,.2,1);
    will-change:transform;
  }

  .library-screen{
    left:0;
    transform:translateX(0);
    border-right:0;
  }

  .player-screen{
    left:0;
    transform:translateX(100%);
  }

  #app.mobile-player-active .library-screen{
    transform:translateX(-100%);
  }

  #app.mobile-player-active .player-screen{
    transform:translateX(0);
  }

  .library-head{
    padding-left:18px;
    padding-right:18px;
  }

  .library-head h1{font-size:25px}

  .song-item{
    min-height:70px;
    padding:14px 18px;
  }

  .song-title{font-size:17px}

  .back-btn{display:inline-flex}

  .player-head{
    padding-left:13px;
    padding-right:13px;
    padding-bottom:11px;
  }

  .player-heading{
    margin-bottom:10px;
  }

  .player-heading h2{
    font-size:20px;
  }

  .player-heading .mini{display:none}

  .player-bar{
    display:grid;
    grid-template-columns:46px 38px minmax(0,1fr);
    border-radius:14px;
    padding:8px;
  }

  .time-info{
    min-width:0;
  }

  .level-progress,
  .tempo-row{
    grid-column:1/-1;
    justify-content:flex-end;
    padding:0 7px 2px;
  }

  .metronome-btn{
    grid-column:1/-1;
    justify-self:end;
    margin:0 7px 2px 0;
  }

  .level-progress{max-width:100%;min-width:0;padding:4px 7px 2px;}
  .tempo-row input{width:min(180px,48vw)}

  .score-shell{
    margin:10px 8px calc(env(safe-area-inset-bottom,0px) + 8px);
    border-radius:7px;
  }

  .score-toolbar{
    min-height:42px;
    position:sticky;
    top:0;
    z-index:5;
  }

  .score-toolbar .hint{display:none}

  #scoreCanvas{
    padding:8px 3px 20px;
  }

  #score-placeholder{
    min-height:260px;
  }
}

@media(max-width:430px){
  .song-number{width:24px;flex-basis:24px}
  .music-icon{width:32px;height:32px;flex-basis:32px}
  .player-bar{grid-template-columns:44px 36px minmax(0,1fr)}
  .play-btn{width:44px;height:44px}
  .stop-btn{width:36px;height:36px}
}