/* ============================================================
   Instructivo de ensamble — GCS
   ============================================================ */

:root{
  --tinta:#0C1116;
  --tinta2:#111924;
  --tinta3:#18222F;
  --papel:#F4F1EA;
  --linea:rgba(244,241,234,.12);
  --gris:#A7AEBA;
  --naranja:#E4572E;
  --titulo:"Space Grotesk","Segoe UI",sans-serif;
  --texto:"Inter","Segoe UI",sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0;}

html,body{height:100%;}

body{
  background:var(--tinta);
  color:var(--papel);
  font-family:var(--texto);
  display:flex;
  flex-direction:column;
  overflow:hidden;
}

/* ---------------------------------------------------------------- cabecera */
.cab{
  height:68px;
  flex:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:0 24px;
  border-bottom:1px solid var(--linea);
  background:var(--tinta2);
}

.cab-marca{display:flex;align-items:center;gap:10px;color:var(--papel);text-decoration:none;}
.cab-marca span{font-family:var(--titulo);font-size:13px;font-weight:600;letter-spacing:.01em;}

.cab-titulo{display:flex;flex-direction:column;line-height:1.3;text-align:center;}
.cab-titulo span{font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--gris);}
.cab-titulo strong{font-family:var(--titulo);font-size:14px;font-weight:600;letter-spacing:.02em;}

.cab-volver{
  font-size:12px;letter-spacing:.06em;color:var(--gris);text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:2px;
}
.cab-volver:hover{color:var(--papel);border-bottom-color:var(--naranja);}

/* ---------------------------------------------------------------- layout */
.principal{
  flex:1;
  min-height:0;
  display:grid;
  grid-template-columns:minmax(0,1.55fr) minmax(360px,1fr);
}

/* ---------------------------------------------------------------- visor */
.visor{
  position:relative;
  min-width:0;
  background:
    radial-gradient(900px 500px at 60% 20%, rgba(228,87,46,.07), transparent 60%),
    var(--tinta);
  border-right:1px solid var(--linea);
}

#lienzo{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:grab;}
#lienzo:active{cursor:grabbing;}

.vistas{
  position:absolute;top:18px;left:18px;
  display:flex;gap:2px;
  background:rgba(12,17,22,.72);
  border:1px solid var(--linea);
  backdrop-filter:blur(8px);
}

.vistas button{
  background:none;border:0;
  color:var(--gris);
  font:500 11px/1 var(--texto);
  letter-spacing:.08em;text-transform:uppercase;
  padding:10px 12px;cursor:pointer;
  transition:color .2s,background .2s;
}
.vistas button:hover{color:var(--papel);}
.vistas button.activo{color:var(--tinta);background:var(--papel);}

.chip-pieza{
  position:absolute;top:18px;right:18px;
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 13px;
  background:rgba(12,17,22,.78);
  border:1px solid var(--linea);
  font-family:var(--titulo);
  font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--papel);
  backdrop-filter:blur(8px);
}
.chip-pieza::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--naranja);
  box-shadow:0 0 0 3px rgba(228,87,46,.18);
}

.barra{
  position:absolute;left:50%;bottom:20px;transform:translateX(-50%);
  display:flex;align-items:center;gap:6px;
  padding:8px;
  background:rgba(17,25,36,.86);
  border:1px solid var(--linea);
  backdrop-filter:blur(10px);
  box-shadow:0 20px 50px rgba(0,0,0,.45);
}

.barra button{
  display:grid;place-items:center;
  width:44px;height:44px;
  background:none;border:1px solid transparent;
  color:var(--papel);cursor:pointer;
  transition:background .2s,border-color .2s,color .2s;
}
.barra button:hover{border-color:var(--linea);background:rgba(244,241,234,.06);}
.barra svg{width:20px;height:20px;}

.play{
  width:56px !important;height:56px !important;
  background:var(--naranja) !important;
  color:#fff !important;
  border-radius:2px;
}
.play:hover{background:#f0643a !important;}
.play .ico-pausa{display:none;}
.play.reproduciendo .ico-play{display:none;}
.play.reproduciendo .ico-pausa{display:block;}

.contador{
  font-family:var(--titulo);
  font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--gris);
  padding:0 14px;
  min-width:120px;text-align:center;
}

/* ---------------------------------------------------------------- panel */
.panel{
  min-height:0;
  overflow-y:auto;
  background:var(--tinta2);
  padding:22px 22px 28px;
  scrollbar-width:thin;
  scrollbar-color:rgba(244,241,234,.25) transparent;
}
.panel::-webkit-scrollbar{width:8px;}
.panel::-webkit-scrollbar-thumb{background:rgba(244,241,234,.2);}

.pasos{list-style:none;display:flex;flex-direction:column;gap:2px;}

.paso{
  display:grid;
  grid-template-columns:44px 1fr;
  gap:14px;
  padding:14px 12px;
  border-left:2px solid transparent;
  cursor:pointer;
  transition:background .2s,border-color .2s;
}
.paso:hover{background:rgba(244,241,234,.04);}

.paso-num{
  font-family:var(--titulo);
  font-size:12px;letter-spacing:.1em;
  color:var(--gris);
  padding-top:2px;
}

.paso-titulo{
  font-family:var(--titulo);
  font-size:15px;font-weight:600;letter-spacing:-.01em;
  color:var(--gris);
}

.paso.actual{background:rgba(228,87,46,.08);border-left-color:var(--naranja);}
.paso.actual .paso-titulo{color:var(--papel);}
.paso.actual .paso-num{color:var(--naranja);}

.paso.hecho .paso-titulo{color:rgba(244,241,234,.45);}
.paso.hecho .paso-num{color:rgba(228,87,46,.5);}

.paso-cuerpo{display:none;}
.paso.actual .paso-cuerpo{display:block;}

.paso-desc{
  margin-top:8px;
  font-size:13.5px;line-height:1.55;
  color:rgba(244,241,234,.72);
}

.paso-datos{
  margin-top:14px;
  display:grid;grid-template-columns:auto 1fr;
  gap:6px 14px;
  font-size:11.5px;
  border-top:1px solid var(--linea);
  padding-top:12px;
}
.paso-datos dt{
  color:var(--gris);
  letter-spacing:.1em;text-transform:uppercase;font-size:9.5px;
  padding-top:2px;
}
.paso-datos dd{color:var(--papel);}

.paso-nota{
  margin-top:12px;
  padding:10px 12px;
  border-left:2px solid var(--naranja);
  background:rgba(228,87,46,.07);
  font-size:12px;line-height:1.5;
  color:rgba(244,241,234,.8);
}

/* ---------------------------------------------------------------- pie */
.pie{
  flex:none;
  height:44px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;
  border-top:1px solid var(--linea);
  background:var(--tinta2);
  font-size:11px;letter-spacing:.04em;color:var(--gris);
}

.aviso{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  max-width:420px;padding:18px 22px;
  background:rgba(40,10,8,.9);
  border:1px solid rgba(228,87,46,.5);
  color:#ffd9cf;font-size:13px;line-height:1.5;text-align:center;
  z-index:5;
}

/* ---------------------------------------------------------------- responsive */
@media (max-width:980px){
  body{overflow:auto;}
  .principal{grid-template-columns:1fr;grid-template-rows:60vh auto;}
  .visor{border-right:0;border-bottom:1px solid var(--linea);}
  .panel{max-height:none;}
  .cab-titulo{display:none;}
  .barra{bottom:12px;}
  .contador{min-width:96px;padding:0 8px;}
}

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