/* base.css — resets, cuerpo, cielo estrellado, tipografía */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0;
  font-family:var(--f-cuerpo);
  font-size:var(--t-cuerpo);
  line-height:1.6;
  color:var(--texto);
  background:var(--fondo);
  background-image:linear-gradient(180deg, var(--fondo-prof) 0%, var(--fondo) 38%, var(--fondo) 100%);
  background-attachment:fixed;
  min-height:100dvh;
  overflow-x:hidden;
}
h1,h2,h3{ font-family:var(--f-titulo); font-weight:600; line-height:1.25; margin:0 0 .4em; text-wrap:balance; }
h1{ font-size:var(--t-titulo); }
h2{ font-size:var(--t-sub); }
p{ margin:.55em 0; text-wrap:pretty; }
a{ color:var(--secundaria); text-decoration:none; }
a:hover{ color:var(--primaria); }
strong{ font-weight:800; }
em{ font-style:italic; }
button{ font-family:inherit; font-size:inherit; color:inherit; }
input,select,textarea{ font-family:inherit; font-size:var(--t-cuerpo); color:var(--texto); }
img,svg{ max-width:100%; display:block; }
table{ border-collapse:collapse; width:100%; font-size:var(--t-chico); }
th,td{ padding:8px 10px; text-align:left; border-bottom:1px solid var(--linea); vertical-align:top; }
th{ color:var(--secundaria); font-weight:700; }
:focus-visible{ outline:2px solid var(--primaria); outline-offset:2px; border-radius:6px; }

/* ---- contenedor principal ---- */
#vista{
  max-width:var(--ancho-max);
  margin:0 auto;
  padding:20px 20px calc(150px + env(safe-area-inset-bottom));
  min-height:100dvh;
  position:relative;
  z-index:1;
}

/* ---- transición de pantalla: fade + slide, como quien mece ---- */
.pantalla{ animation:llegar var(--transicion) both; }
@keyframes llegar{
  from{ opacity:0; transform:translateY(10px); }
  to{ opacity:1; transform:none; }
}

/* ---- el cielo vivo: campo de estrellas ---- */
#cielo{
  position:fixed; inset:0; z-index:0; pointer-events:none; overflow:hidden;
}
#cielo .estrella{
  position:absolute;
  border-radius:50%;
  background:var(--estrella);
  animation:titilar var(--dur,4s) ease-in-out var(--ret,0s) infinite alternate;
}
@keyframes titilar{
  from{ opacity:var(--op-min,.15); }
  to{ opacity:var(--op-max,.4); }
}
[data-tema="alba"] #cielo{ opacity:.5; }
body.leyendo #cielo{ opacity:.25; }   /* discreto en telas de lectura */
body.en-sos #cielo{ display:none; }

@media (prefers-reduced-motion: reduce){
  #cielo .estrella{ animation:none; opacity:.2; }
  .pantalla{ animation:none; }
  *{ transition-duration:0ms !important; animation-duration:0ms !important; }
}

/* ---- menú inferior ---- */
#menu{
  position:fixed; left:0; right:0; bottom:0; z-index:40;
  display:flex; justify-content:center; gap:0;
  background:color-mix(in oklab, var(--fondo-prof) 88%, transparent);
  backdrop-filter:blur(10px);
  border-top:1px solid var(--linea);
  padding:6px max(8px, env(safe-area-inset-left)) calc(6px + env(safe-area-inset-bottom));
}
#menu button{
  flex:1 1 0; max-width:120px; min-height:var(--toque);
  display:flex; flex-direction:column; align-items:center; gap:2px;
  background:none; border:0; cursor:pointer;
  color:var(--texto-2); font-size:calc(11.5px * var(--escala)); font-weight:700; letter-spacing:.04em;
  border-radius:var(--radio-chico);
  transition:color var(--transicion);
}
#menu button svg{ width:24px; height:24px; }
#menu button.activo{ color:var(--primaria); }
#menu[hidden]{ display:none; }

/* ---- botón S.O.S. fijo (discreto en reposo; pleno al tocar) ---- */
#btn-sos{
  position:fixed; right:16px; bottom:calc(84px + env(safe-area-inset-bottom)); z-index:41;
  min-width:64px; min-height:64px; border-radius:50%;
  background:var(--sos-boton); color:var(--sos-texto);
  border:1.5px solid var(--sos-borde);
  font-weight:800; font-size:calc(13px * var(--escala)); letter-spacing:.06em;
  box-shadow:0 6px 22px rgba(0,0,0,.4);
  cursor:pointer;
  display:flex; align-items:center; justify-content:center; flex-direction:column; gap:1px;
  opacity:.55; transition:opacity 150ms ease-out, transform 150ms ease-out;
}
#btn-sos:hover, #btn-sos:focus-visible, #btn-sos:active{ opacity:1; }
#btn-sos:active{ transform:scale(.96); }
body.leyendo #btn-sos{
  min-width:48px; min-height:48px; font-size:calc(10.5px * var(--escala));
}
body.leyendo #btn-sos .puntito{ width:6px; height:6px; }
#btn-sos[hidden]{ display:none; }
#btn-sos .puntito{ width:8px; height:8px; border-radius:50%; background:#B5453A; }

/* ---- toast ---- */
#toast{
  position:fixed; left:50%; bottom:calc(104px + env(safe-area-inset-bottom));
  transform:translateX(-50%);
  z-index:60; max-width:min(92vw, 420px);
  background:var(--carta-alta); color:var(--texto);
  border:1px solid var(--linea); border-radius:14px;
  padding:12px 18px; font-size:var(--t-chico); font-weight:600;
  box-shadow:var(--sombra); text-align:center;
  animation:llegar 200ms both;
}
#toast[hidden]{ display:none; }
#toast button{ background:none; border:0; color:var(--primaria); font-weight:800; cursor:pointer; padding:4px 8px; }

/* ---- tour guiado (spotlight) ---- */
#tour-capa{ position:fixed; inset:0; z-index:70; }
#tour-capa .tour-hueco{
  position:absolute; border-radius:18px;
  box-shadow:0 0 0 9999px var(--scrim);
  border:1.5px solid var(--primaria);
  transition:all 250ms ease-out;
  pointer-events:none;
}
#tour-capa .tour-carta{
  position:absolute; left:50%; transform:translateX(-50%);
  width:min(88vw, 380px);
  background:var(--carta-alta); border:1px solid var(--linea); border-radius:var(--radio);
  padding:16px 20px; box-shadow:var(--sombra);
  animation:llegar 250ms both;
}
#tour-capa .tour-paso{ font-size:calc(12px * var(--escala)); font-weight:800; color:var(--primaria); letter-spacing:.08em; }
#tour-capa h3{ margin:.25em 0 .3em; font-size:var(--t-sub); }
#tour-capa p{ margin:0 0 12px; color:var(--texto-2); }
#tour-capa .tour-botones{ display:flex; justify-content:space-between; align-items:center; gap:10px; }

/* ---- capa modal ---- */
#capa-modal{
  position:fixed; inset:0; z-index:50;
  background:var(--scrim);
  display:flex; align-items:flex-end; justify-content:center;
  animation:aparecer 200ms both;
}
#capa-modal[hidden]{ display:none; }
@keyframes aparecer{ from{opacity:0} to{opacity:1} }
.modal{
  width:100%; max-width:var(--ancho-max);
  max-height:86dvh; overflow-y:auto;
  background:var(--carta); border-radius:22px 22px 0 0;
  padding:22px 22px calc(22px + env(safe-area-inset-bottom));
  box-shadow:var(--sombra);
  animation:llegar 240ms both;
}