/* Blues desde cero · versión web
   Mismos colores que las salas de práctica: negro cálido, el amarillo del
   instituto y los colores de la grilla del PDF (I azul, IV naranja, V rojo). */
:root{
  --fondo:#0D0B0A; --panel:#151210; --panel2:#1c1815; --borde:#2a2521;
  --texto:#ECE7E1; --suave:#A39C94; --tenue:#6E6963;
  --oro:#F5C518; --oro2:#C98A0E;
  --g1:#2F7DE1; --g4:#F07A1A; --g5:#E0412F;
  --tonica:#5DBB63; --tercera:#F2C744; --quinta:#4A90E2; --septima:#E5534B; --blue:#9B7BE8;
  --papel:#F7F2E8;
  --radio:16px;
  --h:'Poppins',Arial,Helvetica,sans-serif; --b:'Inter',Arial,Helvetica,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{background:var(--fondo);color:var(--texto);font-family:var(--b);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--oro)}
b,strong{color:#fff}
.wrap{width:100%;max-width:1040px;margin:0 auto;padding:0 20px}

/* ---------- barra de arriba ---------- */
.top{position:sticky;top:0;z-index:50;background:rgba(13,11,10,.86);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--borde)}
.top .wrap{display:flex;align-items:center;gap:14px;height:58px}
.top .marca{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff;font:900 15px var(--h);letter-spacing:-.2px;white-space:nowrap}
.top .marca img{height:30px;width:auto}
.top nav{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.top nav::-webkit-scrollbar{display:none}
.top nav a{color:var(--suave);text-decoration:none;font:700 13px var(--h);padding:7px 11px;border-radius:9px;white-space:nowrap}
.top nav a:hover,.top nav a.on{color:#fff;background:var(--panel2)}
.progreso{position:absolute;left:0;bottom:-1px;height:2px;background:var(--oro);width:0;transition:width .3s}

/* ---------- portada ---------- */
.hero{position:relative;overflow:hidden;background:radial-gradient(120% 90% at 80% 20%,#6b4a12 0%,#2b1d08 38%,var(--fondo) 75%)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;align-items:center;min-height:min(88vh,760px);padding-top:40px;padding-bottom:40px}
.hero h1{font:900 clamp(52px,9vw,112px)/.88 var(--h);letter-spacing:-3px;text-transform:uppercase}
.hero h1 span{display:block;color:var(--oro)}
.hero .bajada{font:600 clamp(16px,2vw,21px) var(--h);letter-spacing:3px;text-transform:uppercase;color:#fff;margin:22px 0 8px;opacity:.9}
.hero .autor{color:var(--suave);font-size:15px;letter-spacing:1px;text-transform:uppercase;margin-top:6px}
.hero .autor b{color:#fff}
.hero .guitarra{justify-self:center;max-height:640px;width:auto;filter:drop-shadow(0 30px 60px rgba(0,0,0,.6));transform:rotate(8deg)}
.hero .logos{display:flex;align-items:center;gap:18px;margin-top:28px}
.hero .logos img{height:56px;width:auto}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--oro);color:#0D0B0A;border:0;border-radius:12px;font:800 16px var(--h);padding:13px 22px;cursor:pointer;text-decoration:none;transition:transform .12s,background .12s}
.btn:hover{background:#ffd52e;transform:translateY(-1px)}
.btn.sec{background:transparent;color:#fff;border:1.5px solid #4a423a}
.btn.sec:hover{border-color:var(--oro);color:var(--oro);background:transparent}
.hero .acciones{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.ondas{position:absolute;left:0;right:0;bottom:0;height:120px;opacity:.25;pointer-events:none}

/* ---------- índice ---------- */
.indice{padding:70px 0 20px}
.indice h2{font:900 34px var(--h);letter-spacing:-1px;margin-bottom:22px}
.partes{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.parte-card{background:var(--panel);border:1px solid var(--borde);border-radius:var(--radio);padding:22px;text-decoration:none;color:var(--texto);display:flex;flex-direction:column;gap:6px;transition:border-color .15s,transform .15s}
.parte-card:hover{border-color:var(--oro);transform:translateY(-2px)}
.parte-card em{font:800 12px var(--h);color:var(--oro);letter-spacing:2px;text-transform:uppercase;font-style:normal}
.parte-card b{font:900 22px/1.15 var(--h)}
.parte-card ul{list-style:none;margin-top:10px;font-size:14px;color:var(--suave)}
.parte-card li{padding:3px 0;display:flex;justify-content:space-between;gap:8px}
.parte-card li i{font-style:normal;color:var(--tenue)}
.parte-card li.hecho{color:var(--tonica)}
.parte-card li.hecho i::before{content:"✓ "}

/* ---------- separadores de parte ---------- */
.portada-parte{position:relative;margin-top:90px;min-height:360px;display:flex;align-items:center;background:#000 url(img/fondo-parte.jpg) center/cover;overflow:hidden}
.portada-parte::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(13,11,10,.95) 0%,rgba(13,11,10,.7) 50%,rgba(107,74,18,.55) 100%)}
.portada-parte .wrap{position:relative}
.portada-parte em{font:800 14px var(--h);color:var(--oro);letter-spacing:4px;text-transform:uppercase;font-style:normal}
.portada-parte h2{font:900 clamp(54px,9vw,104px)/.9 var(--h);letter-spacing:-3px;text-transform:uppercase;margin:6px 0 6px}
.portada-parte p{font:400 clamp(30px,4.4vw,48px)/1.1 'Caveat Brush',cursive;color:#fff;opacity:.95}

/* ---------- capítulos ---------- */
.cap{padding:64px 0 10px}
.cap-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:18px}
.cap-num{flex:0 0 auto;font:900 15px var(--h);color:#0D0B0A;background:var(--oro);border-radius:10px;width:40px;height:40px;display:grid;place-items:center;margin-top:6px}
.cap h3{font:900 clamp(28px,4vw,40px)/1.1 var(--h);letter-spacing:-1px}
.nivel{display:inline-block;font:800 12px var(--h);letter-spacing:2px;text-transform:uppercase;color:var(--oro);border:1.5px solid var(--oro2);border-radius:999px;padding:3px 12px;margin-bottom:8px}
.cap p{max-width:720px;margin:0 0 14px;color:#d5cfc8}
.cap p.lead{font-size:19px;color:#fff}
.cap h4{font:800 19px var(--h);margin:30px 0 10px}
.cap ul.lista{margin:0 0 14px 20px;color:#d5cfc8}
.cap ul.lista li{margin:4px 0}
.cap ul.lista li i{color:var(--suave)}
.tip{border-left:3px solid var(--oro);background:var(--panel);border-radius:0 12px 12px 0;padding:14px 18px;margin:18px 0;max-width:760px;color:#d5cfc8;font-size:16px}
.tip b{color:var(--oro)}
.hecho-btn{margin-top:22px;display:inline-flex;align-items:center;gap:10px;background:var(--panel);color:var(--suave);border:1px solid var(--borde);border-radius:999px;font:700 14px var(--h);padding:9px 18px 9px 12px;cursor:pointer}
.hecho-btn::before{content:"";width:18px;height:18px;border-radius:50%;border:2px solid var(--tenue)}
.hecho-btn:hover{color:#fff;border-color:#4a423a}
.hecho-btn.on{color:var(--tonica);border-color:rgba(93,187,99,.5);background:rgba(93,187,99,.08)}
.hecho-btn.on::before{background:var(--tonica) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8.5l2.5 2.5L12 5.5' stroke='%230D0B0A' stroke-width='2.4' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") center/14px no-repeat;border-color:var(--tonica)}

/* ---------- widget: caja de herramienta interactiva ---------- */
.widget{background:var(--panel);border:1px solid var(--borde);border-radius:var(--radio);padding:18px;margin:20px 0}
.widget .wtit{display:flex;align-items:center;gap:10px;font:800 13px var(--h);letter-spacing:1.5px;text-transform:uppercase;color:var(--suave);margin-bottom:14px}
.widget .wtit::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--oro);box-shadow:0 0 10px var(--oro)}
.controles{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;margin-top:14px}
.controles label{font:700 12px var(--h);letter-spacing:1px;text-transform:uppercase;color:var(--tenue)}
.seg{display:inline-flex;background:var(--fondo);border:1px solid var(--borde);border-radius:11px;padding:3px;gap:2px;flex-wrap:wrap}
.seg button{background:transparent;border:0;color:var(--suave);font:700 14px var(--h);padding:7px 12px;border-radius:8px;cursor:pointer;min-width:38px}
.seg button:hover{color:#fff}
.seg button.on{background:var(--oro);color:#0D0B0A}
.play{display:inline-flex;align-items:center;gap:8px;background:var(--oro);color:#0D0B0A;border:0;border-radius:11px;font:800 15px var(--h);padding:10px 18px;cursor:pointer;min-width:120px;justify-content:center}
.play:hover{background:#ffd52e}
.play.on{background:#fff}
.play svg{width:14px;height:14px}
input[type=range]{accent-color:var(--oro);width:130px;vertical-align:middle}
.bpm{font:800 15px var(--h);color:#fff;min-width:66px;display:inline-block}

/* grilla de 12 compases */
.grilla{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.compas{position:relative;border-radius:10px;min-height:64px;display:flex;flex-direction:column;align-items:center;justify-content:center;font:900 22px var(--h);color:#fff;transition:transform .1s,box-shadow .1s,filter .1s;user-select:none}
.compas .n{position:absolute;top:4px;left:7px;font:700 10px var(--h);opacity:.6}
.compas .et{font:700 11px var(--h);letter-spacing:1px;text-transform:uppercase;opacity:.9;margin-top:2px}
.compas.g1{background:var(--g1)} .compas.g4{background:var(--g4)} .compas.g5{background:var(--g5)}
.grilla.tocando .compas{filter:brightness(.45) saturate(.7)}
.grilla.tocando .compas.on{filter:none;transform:scale(1.05);box-shadow:0 0 0 3px #fff,0 8px 24px rgba(0,0,0,.5);z-index:2}
.compas .pr{position:absolute;top:5px;right:6px;font:800 10px var(--h);letter-spacing:.5px;text-transform:uppercase;background:rgba(0,0,0,.28);border-radius:5px;padding:1px 6px}
.compas.esc-may{background:var(--g1)} .compas.esc-men{background:var(--g4)} .compas.esc-amb{background:linear-gradient(135deg,var(--g4) 50%,var(--g1) 50%)}
.ahora{display:flex;align-items:baseline;gap:14px;min-height:40px;margin:0 0 10px}
.ahora b{font:900 30px var(--h);color:var(--oro)}
.ahora span{color:var(--suave);font-size:14px}
.pulsos{display:flex;gap:6px;margin-left:auto}
.pulsos i{width:10px;height:10px;border-radius:50%;background:var(--borde)}
.pulsos i.on{background:var(--oro)}

/* mástil */
.mastil-box{background:#100d0b;border:1px solid var(--borde);border-radius:12px;padding:8px 6px;overflow-x:auto;-webkit-overflow-scrolling:touch}
svg.mastil{display:block;width:100%;min-width:640px;height:auto}
svg.mastil.corto{min-width:420px}
svg.mastil .nota{cursor:pointer;transition:transform .1s}
svg.mastil .nota:hover circle{stroke:#fff;stroke-width:2.5}
svg.mastil .nota.suena circle{stroke:#fff;stroke-width:4}
.leyenda{display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:12px;font-size:13px;color:var(--suave)}
.leyenda span{display:inline-flex;align-items:center;gap:6px}
.leyenda i{width:14px;height:14px;border-radius:50%;display:inline-block}
.desliza{display:none;font-size:12px;color:var(--tenue);margin-top:6px}

/* tresillo del shuffle */
.tresillo{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:6px 0 4px}
.tiempo{background:var(--fondo);border:1px solid var(--borde);border-radius:10px;padding:10px 8px 8px}
.tiempo .t{font:800 12px var(--h);color:var(--tenue);margin-bottom:6px;text-align:center}
.celdas{display:grid;grid-template-columns:repeat(6,1fr);gap:3px;height:34px}
.celdas i{border-radius:5px;background:#221d19}
.celdas i.nota{background:var(--oro2)}
.celdas i.nota.on{background:var(--oro);box-shadow:0 0 12px var(--oro)}

/* acorde 7 */
.roles{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:14px}
.rol{border-radius:10px;padding:10px 12px;color:#0D0B0A;cursor:pointer;border:2px solid transparent;transition:opacity .15s}
.rol b{color:#0D0B0A;font:900 17px var(--h);display:block}
.rol span{font-size:12.5px;line-height:1.35;display:block}
.rol.off{opacity:.28}
.rol.r1{background:var(--tonica)} .rol.r3{background:var(--tercera)} .rol.r5{background:var(--quinta);color:#fff} .rol.r5 b{color:#fff} .rol.r7{background:var(--septima);color:#fff} .rol.r7 b{color:#fff}

/* ---------- tabs ---------- */
.tab{background:var(--panel);border:1px solid var(--borde);border-radius:var(--radio);margin:22px 0;overflow:hidden}
.tab-head{display:flex;align-items:center;gap:14px;padding:14px 16px;flex-wrap:wrap}
.tab-head .tt{flex:1 1 220px}
.tab-head .tt b{font:800 18px/1.2 var(--h);display:block}
.tab-head .tt span{font-size:14px;color:var(--suave)}
.tab-ctrl{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.tab-ctrl .chip{background:var(--fondo);border:1px solid var(--borde);color:var(--suave);border-radius:9px;font:700 13px var(--h);padding:8px 11px;cursor:pointer}
.tab-ctrl .chip:hover{color:#fff;border-color:#4a423a}
.tab-ctrl .chip.on{color:#0D0B0A;background:var(--oro);border-color:var(--oro)}
.tab-ctrl select{background:var(--fondo);border:1px solid var(--borde);color:#fff;border-radius:9px;font:700 13px var(--h);padding:8px 8px}
.tab-papel{background:var(--papel);position:relative;min-height:120px}
.tab-papel .at-surface{margin:0 auto}
.tab-papel img{margin:0 auto;padding:16px 10px;max-width:900px;width:100%}
.tab-papel .cargando{position:absolute;inset:0;display:grid;place-items:center;color:#8a8178;font:700 14px var(--h)}
.tab-papel.colapsado{max-height:340px;overflow:hidden}
.tab-papel.colapsado::after{content:"";position:absolute;left:0;right:0;bottom:0;height:90px;background:linear-gradient(transparent,var(--papel))}
.tab-mas{display:block;width:100%;background:var(--panel2);border:0;border-top:1px solid var(--borde);color:var(--suave);font:700 13px var(--h);padding:10px;cursor:pointer}
.tab-mas:hover{color:#fff}
.at-cursor-bar{background:rgba(245,197,24,.18)}
.at-selection div{background:rgba(245,197,24,.25)}
.at-cursor-beat{background:#C98A0E;width:3px}
.at-highlight *{fill:#C0392B;stroke:#C0392B}
.tab-nota{font-size:13px;color:var(--tenue);padding:0 16px 12px}

/* ---------- backings ---------- */
.backings{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:12px;margin-top:14px}
.bk{background:var(--panel);border:1px solid var(--borde);border-radius:14px;padding:14px 16px;display:flex;align-items:center;gap:14px}
.bk button{flex:0 0 auto;width:48px;height:48px;border-radius:50%;border:0;background:var(--oro);cursor:pointer;display:grid;place-items:center}
.bk button svg{width:16px;height:16px}
.bk .info{flex:1;min-width:0}
.bk .info b{font:800 16px var(--h);display:block}
.bk .info span{font-size:13px;color:var(--suave)}
.bk .barra{height:4px;background:var(--borde);border-radius:2px;margin-top:8px;cursor:pointer;position:relative}
.bk .barra i{position:absolute;left:0;top:0;bottom:0;background:var(--oro);border-radius:2px;width:0}

/* ---------- final ---------- */
.final{margin-top:90px;padding:80px 0;background:radial-gradient(100% 120% at 50% 0%,#3a2a0c 0%,var(--fondo) 70%);text-align:center}
.final h2{font:900 clamp(40px,7vw,72px)/.95 var(--h);letter-spacing:-2px;text-transform:uppercase;margin-bottom:22px}
.final p{max-width:640px;margin:0 auto 14px;color:#d5cfc8;font-size:18px}
.final .acciones{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:28px}
footer{padding:30px 0 50px;color:var(--tenue);font-size:13px;text-align:center}
footer img{height:44px;width:auto;margin:0 auto 12px;opacity:.7}

/* ---------- celular ---------- */
@media (max-width:820px){
  body{font-size:16px}
  .hero .wrap{grid-template-columns:1fr;min-height:auto;padding-top:34px;text-align:left}
  .hero .guitarra{max-height:300px;order:-1;justify-self:end;margin:-10px -20px -30px 0}
  .partes{grid-template-columns:1fr}
  .top .marca span{display:none}
  .roles{grid-template-columns:repeat(2,1fr)}
  .tresillo{grid-template-columns:repeat(2,1fr)}
  .desliza{display:block}
  .compas{min-height:54px;font-size:18px}
  .ahora b{font-size:24px}
  .portada-parte{min-height:280px;margin-top:60px}
  .cap{padding-top:50px}
}
@media (max-width:480px){
  .wrap{padding:0 16px}
  .top nav a{padding:6px 7px;font-size:12px}
  .ahora{flex-wrap:wrap;gap:2px 12px;min-height:0}
  .ahora b{font-size:22px}
  .ahora span{font-size:13px;order:3;flex:1 1 100%}
  .seg button{padding:6px 9px;min-width:31px;font-size:13px}
  .controles{gap:10px 14px}
  .tab-head .play{min-width:0}
  .grilla{gap:4px}
  .compas .et{font-size:9px;letter-spacing:.3px}
  .compas .pr{font-size:8px;padding:1px 4px}
  .widget{padding:14px 12px}
}