/* =====================================================================
   UPCN Digital · Plataforma de Capacitación — pantalla de ingreso
   Paleta derivada del logo institucional.
   ===================================================================== */
:root{
  --navy-900:#04162C;   /* fondo profundo */
  --navy-800:#071E3A;
  --navy-700:#00355F;   /* azul UPCN */
  --navy-600:#0A4A7A;
  --celeste :#74ACDF;   /* celeste bandera */
  --celeste-lt:#A9D2F2;
  --gold    :#F6B40E;   /* sol de mayo */
  --gold-lt :#FFD873;
  --white   :#FFFFFF;
  --ink-soft:#BFD4E8;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:"Barlow",system-ui,sans-serif;
  color:var(--white);
  background:
    radial-gradient(1100px 720px at 50% 12%, #0B2E52 0%, transparent 60%),
    radial-gradient(900px 600px at 82% 88%, #0A3C66 0%, transparent 55%),
    linear-gradient(160deg,var(--navy-900) 0%, var(--navy-800) 45%, #05203D 100%);
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
}

/* Viñeta sutil para dar profundidad */
body::after{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:6;
  background:radial-gradient(120% 120% at 50% 45%, transparent 55%, rgba(0,0,0,.55) 100%);
}

/* ---------- Canvas de partículas ---------- */
#fx{position:fixed;inset:0;z-index:0;display:block}

/* ---------- Cintas flameando (marchas) ---------- */
.ribbons{position:fixed;inset:0;z-index:1;overflow:hidden;pointer-events:none;opacity:.55}
.ribbon{
  position:absolute;left:-30%;width:160%;height:130px;border-radius:50%;
  filter:blur(14px);opacity:.5;
  transform:rotate(-8deg);
  animation:drift 14s linear infinite;
}
.ribbon.r1{top:18%;background:linear-gradient(90deg,transparent,var(--celeste),transparent);animation-duration:16s}
.ribbon.r2{top:48%;height:90px;background:linear-gradient(90deg,transparent,#ffffff,transparent);opacity:.28;animation-duration:12s;animation-delay:-4s}
.ribbon.r3{top:74%;background:linear-gradient(90deg,transparent,var(--celeste-lt),transparent);animation-duration:19s;animation-delay:-8s}
@keyframes drift{
  0%{transform:translateX(-12%) translateY(0) rotate(-8deg)}
  50%{transform:translateX(8%) translateY(-22px) rotate(-5deg)}
  100%{transform:translateX(-12%) translateY(0) rotate(-8deg)}
}

/* ---------- Escenario central ---------- */
.stage{
  position:relative;z-index:3;min-height:100dvh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:32px 22px;gap:0;
}

/* Sol de Mayo detrás del logo */
.sun-wrap{
  position:absolute;top:50%;left:50%;
  width:min(78vmin,560px);aspect-ratio:1;
  transform:translate(-50%,-58%) scale(.4);
  opacity:0;z-index:-1;
  filter:drop-shadow(0 0 40px rgba(246,180,14,.35));
  animation:sunIn 1.1s cubic-bezier(.16,1,.3,1) .15s forwards;
}
.sun{width:100%;height:100%;display:block}
.sun .rays{transform-origin:250px 250px;animation:spin 60s linear infinite}
.rays-wavy{transform-origin:250px 250px;animation:spin 90s linear infinite reverse}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes sunIn{
  0%{opacity:0;transform:translate(-50%,-58%) scale(.4) rotate(-25deg)}
  100%{opacity:.9;transform:translate(-50%,-58%) scale(1) rotate(0)}
}
.sun-face{opacity:.75}

/* Logo */
.logo{
  width:min(74vw,440px);height:auto;
  filter:drop-shadow(0 14px 30px rgba(0,0,0,.55));
  opacity:0;transform:translateY(26px) scale(.94);
  animation:riseIn .9s cubic-bezier(.16,1,.3,1) .75s forwards;
}

/* Título */
.title{
  font-family:"Barlow Condensed",sans-serif;
  font-style:italic;font-weight:700;
  margin:22px 0 4px;line-height:.95;letter-spacing:.5px;
  text-transform:uppercase;
}
.title .line-1{
  display:block;font-size:clamp(20px,4.4vw,34px);font-weight:600;
  color:var(--celeste-lt);letter-spacing:2px;
  opacity:0;animation:riseIn .8s ease 1.15s forwards;
}
.title .line-2{
  display:block;font-size:clamp(46px,11vw,96px);font-weight:800;
  color:var(--white);
  text-shadow:0 4px 24px rgba(116,172,223,.35);
  opacity:0;animation:riseIn .8s ease 1.32s forwards;
}
.title .line-2 b{color:var(--gold-lt);font-weight:800}

.subtitle{
  margin:6px 0 0;font-size:clamp(14px,2.4vw,18px);
  color:var(--ink-soft);letter-spacing:.4px;
  opacity:0;animation:riseIn .8s ease 1.5s forwards;
}

@keyframes riseIn{to{opacity:1;transform:none}}

/* ---------- Loader ---------- */
.loader{
  width:min(88vw,420px);margin-top:38px;
  opacity:0;animation:riseIn .8s ease 1.7s forwards;
}
.loader-track{
  height:8px;border-radius:99px;overflow:hidden;
  background:rgba(255,255,255,.12);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.08);
}
.loader-fill{
  height:100%;width:0;border-radius:99px;
  background:linear-gradient(90deg,var(--celeste),var(--gold));
  box-shadow:0 0 18px rgba(246,180,14,.6);
  transition:width .18s ease-out;
}
.loader-meta{
  display:flex;justify-content:space-between;align-items:center;
  margin-top:12px;font-size:13.5px;letter-spacing:.4px;color:var(--ink-soft);
}
.pct{font-variant-numeric:tabular-nums;color:var(--gold-lt);font-weight:600}

/* ---------- Botón ingresar ---------- */
.enter-btn{
  margin-top:26px;display:inline-flex;align-items:center;gap:9px;
  font-family:"Barlow",sans-serif;font-size:15px;font-weight:600;letter-spacing:.4px;
  color:var(--navy-900);background:var(--gold-lt);
  border:0;border-radius:99px;padding:13px 24px;cursor:pointer;
  box-shadow:0 10px 26px rgba(246,180,14,.32);
  opacity:0;animation:riseIn .8s ease 2s forwards;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.enter-btn:hover{transform:translateY(-2px);background:var(--gold);box-shadow:0 14px 32px rgba(246,180,14,.5)}
.enter-btn:active{transform:translateY(0)}
.enter-btn:focus-visible{outline:3px solid var(--celeste);outline-offset:3px}
.enter-btn svg path{transition:transform .18s ease}
.enter-btn:hover svg{animation:nudge .7s ease infinite}
@keyframes nudge{50%{transform:translateX(3px)}}

/* ---------- Warp / portal final ---------- */
.warp{position:fixed;inset:0;z-index:20;pointer-events:none;opacity:0}
.warp.active{pointer-events:auto}
.warp-lines{position:absolute;inset:0;overflow:hidden}
.warp-lines i{
  position:absolute;top:50%;left:50%;height:3px;width:2px;border-radius:3px;
  background:linear-gradient(90deg,transparent,var(--celeste-lt),var(--white));
  box-shadow:0 0 8px rgba(169,210,242,.8);
  transform-origin:left center;opacity:0;
}
.warp-flash{
  position:absolute;inset:0;background:radial-gradient(circle at 50% 50%,#fff 0%,var(--celeste) 30%,transparent 70%);
  opacity:0;transform:scale(.2);
}

/* Estado: entrando al portal */
body.launching .stage{animation:zoomThru 1.15s cubic-bezier(.7,0,.84,0) forwards}
body.launching .sun-wrap{animation:sunBlast 1.15s ease forwards}
@keyframes zoomThru{
  0%{transform:scale(1);filter:blur(0)}
  60%{opacity:1}
  100%{transform:scale(3.4);opacity:0;filter:blur(6px)}
}
@keyframes sunBlast{
  0%{transform:translate(-50%,-58%) scale(1);opacity:.9}
  100%{transform:translate(-50%,-58%) scale(5);opacity:0}
}
body.launching .warp{opacity:1;transition:opacity .3s ease}
body.launching .warp-flash{
  animation:flash 1.15s ease-in forwards;
}
@keyframes flash{
  0%{opacity:0;transform:scale(.12)}
  45%{opacity:0;transform:scale(.35)}
  72%{opacity:.4;transform:scale(1.2)}
  100%{opacity:1;transform:scale(4)}
}

/* ---------- noscript ---------- */
.noscript{
  position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;
  background:var(--navy-900);color:#fff;padding:24px;text-align:center;font-size:16px;
}
.noscript a{color:var(--gold-lt)}

/* ---------- Responsivo ---------- */
@media (max-width:520px){
  .title{margin-top:16px}
  .loader{margin-top:30px}
  .sun-wrap{width:96vmin}
}

/* ---------- Accesibilidad: menos movimiento ---------- */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001s!important;animation-iteration-count:1!important;transition:none!important}
  .sun-wrap,.logo,.title .line-1,.title .line-2,.subtitle,.loader,.enter-btn{opacity:1;transform:none}
  .sun-wrap{transform:translate(-50%,-58%)}
  .ribbons{display:none}
}