:root{
  --bg1:#31172f;
  --bg2:#7b244f;
  --card:rgba(255,255,255,.92);
  --text:#3b2036;
  --muted:#765f72;
  --accent:#d63384;
  --accent2:#ff8fab;
  --shadow:0 24px 80px rgba(0,0,0,.28);
}
*{box-sizing:border-box}
html,body{
  height:100%;
  margin:0;
  font-family:Inter,system-ui,Arial,sans-serif;
  color:var(--text);
  overflow:hidden;
  background:
    radial-gradient(circle at 50% 18%, rgba(255,205,220,.75) 0 0, transparent 31%),
    radial-gradient(circle at 18% 68%, rgba(255,110,165,.35) 0 0, transparent 24%),
    radial-gradient(circle at 86% 72%, rgba(255,110,165,.30) 0 0, transparent 28%),
    linear-gradient(135deg,#42183b 0%,#b4547d 46%,#55183d 100%);
}

/* Capa de brillos y corazoncitos. No usa imagen externa. */
body:before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    radial-gradient(circle at 10% 18%,rgba(255,255,255,.55) 0 2px,transparent 3px),
    radial-gradient(circle at 18% 30%,rgba(255,150,190,.55) 0 6px,transparent 7px),
    radial-gradient(circle at 27% 82%,rgba(255,255,255,.55) 0 2px,transparent 3px),
    radial-gradient(circle at 77% 20%,rgba(255,220,120,.65) 0 3px,transparent 4px),
    radial-gradient(circle at 88% 36%,rgba(255,120,170,.55) 0 6px,transparent 7px),
    radial-gradient(circle at 70% 72%,rgba(255,255,255,.45) 0 2px,transparent 3px);
  opacity:.8;
}

/* Nubes rosadas inferiores, hechas con CSS. */
body:after{
  content:"";
  position:fixed;
  left:-10%;
  right:-10%;
  bottom:-90px;
  height:260px;
  pointer-events:none;
  z-index:0;
  background:
    radial-gradient(circle at 4% 68%, rgba(255,128,178,.52) 0 85px, transparent 86px),
    radial-gradient(circle at 13% 60%, rgba(255,128,178,.48) 0 105px, transparent 106px),
    radial-gradient(circle at 25% 76%, rgba(255,80,150,.38) 0 120px, transparent 121px),
    radial-gradient(circle at 50% 86%, rgba(255,80,150,.32) 0 135px, transparent 136px),
    radial-gradient(circle at 74% 75%, rgba(255,80,150,.38) 0 118px, transparent 119px),
    radial-gradient(circle at 88% 62%, rgba(255,128,178,.48) 0 108px, transparent 109px),
    radial-gradient(circle at 99% 68%, rgba(255,128,178,.52) 0 90px, transparent 91px);
  filter:blur(.2px);
}
#confetti{position:fixed;inset:0;z-index:6;pointer-events:none}
.app-shell{position:relative;z-index:2;width:100%;height:100%;max-width:540px;margin:0 auto;padding:18px 16px 26px;display:flex;align-items:center;justify-content:center}
.progress{position:fixed;top:16px;left:50%;transform:translateX(-50%);z-index:4;background:rgba(255,255,255,.18);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.28);border-radius:999px;padding:8px 14px;font-size:18px;letter-spacing:3px;color:white;box-shadow:0 8px 24px rgba(0,0,0,.14)}
.heart{opacity:.85}.heart.active{filter:drop-shadow(0 0 8px rgba(255,255,255,.8))}
.scene{position:absolute;inset:0;padding:70px 16px 24px;display:none;align-items:center;justify-content:center;animation:fadeIn .35s ease both}.scene.active{display:flex}
.card{width:min(100%,500px);max-height:calc(100vh - 100px);overflow:auto;background:var(--card);border-radius:28px;padding:28px 22px;text-align:center;box-shadow:var(--shadow);border:1px solid rgba(255,255,255,.72)}
.card::-webkit-scrollbar{width:0}.eyebrow{text-transform:uppercase;letter-spacing:.18em;font-size:12px;font-weight:700;color:var(--accent);margin:0 0 10px}h1,h2{font-family:Pacifico,cursive;font-weight:400;line-height:1.12;margin:0 0 16px}h1{font-size:38px}h2{font-size:34px}.lead{font-size:18px;font-weight:600}.hint,.small-note{color:var(--muted);font-size:14px}.primary-btn,.secondary-btn{border:0;border-radius:999px;padding:15px 20px;margin-top:16px;font-weight:800;font-size:16px;cursor:pointer;min-height:52px;width:100%;transition:.2s transform,.2s filter}.primary-btn{background:linear-gradient(135deg,var(--accent),var(--accent2));color:white;box-shadow:0 12px 28px rgba(214,51,132,.32)}.secondary-btn{background:#fff;color:var(--accent);border:2px solid #ffd1dc}.primary-btn:active,.secondary-btn:active,.cake-area:active,.envelope:active,.chest:active{transform:scale(.97)}.link-btn{display:flex;align-items:center;justify-content:center;text-decoration:none}.cake-area{border:0;background:transparent;margin:10px auto 0;display:block;cursor:pointer;width:220px;height:230px}.cake{position:relative;width:210px;height:220px;margin:auto}.flame{position:absolute;left:95px;top:5px;width:24px;height:38px;background:radial-gradient(circle at 50% 75%,#fff7ad 0 18%,#ffae00 40%,#ff4d00 75%);border-radius:50% 50% 50% 50%;transform-origin:bottom;animation:flicker .8s infinite alternate;filter:drop-shadow(0 0 12px #ffb703)}.flame.off{opacity:0;transform:translateY(12px) scale(.2)}.wick{position:absolute;left:104px;top:40px;width:5px;height:20px;background:#3d2222;border-radius:9px}.candle{position:absolute;left:88px;top:55px;width:38px;height:78px;background:repeating-linear-gradient(45deg,#fff 0 12px,#ffb3c6 12px 24px);border-radius:10px 10px 4px 4px}.cake-top{position:absolute;left:38px;top:118px;width:138px;height:45px;background:#ffd6e0;border-radius:50% 50% 18px 18px;box-shadow:inset 0 -12px #ff8fab}.cake-base{position:absolute;left:28px;top:150px;width:158px;height:54px;background:#9d4edd;border-radius:12px 12px 20px 20px}.plate{position:absolute;left:10px;top:195px;width:195px;height:20px;background:#fff;border-radius:50%;box-shadow:0 6px 12px rgba(0,0,0,.12)}.hidden-message{display:none;animation:pop .45s ease both}.hidden-message.show{display:block}.envelope{width:210px;height:145px;margin:18px auto 8px;border:0;background:#ff8fab;position:relative;border-radius:0 0 16px 16px;box-shadow:0 16px 30px rgba(0,0,0,.16);cursor:pointer;display:block;overflow:hidden}.envelope:before,.envelope:after{content:"";position:absolute;bottom:0;border-style:solid;z-index:2;pointer-events:none}.envelope:before{left:0;border-width:72px 105px 0 0;border-color:transparent rgba(255,179,198,.92) transparent transparent}.envelope:after{right:0;border-width:72px 0 0 105px;border-color:transparent transparent transparent rgba(255,179,198,.92)}.envelope-flap{position:absolute;left:0;top:0;border-style:solid;border-width:75px 105px 0 105px;border-color:#fb6f92 transparent transparent transparent;transform-origin:top;transition:.35s;z-index:3;pointer-events:none}.envelope.open .envelope-flap{transform:rotateX(180deg);opacity:.35}.envelope-paper{position:absolute;left:28px;right:28px;top:38px;background:white;padding:18px 10px;border-radius:10px;font-family:Pacifico,cursive;font-size:24px;color:var(--accent);z-index:4;box-shadow:0 6px 14px rgba(0,0,0,.08);pointer-events:none}.tap-helper{font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:#fff;background:rgba(214,51,132,.75);display:inline-flex;gap:6px;align-items:center;padding:9px 14px;border-radius:999px;box-shadow:0 8px 22px rgba(0,0,0,.16);animation:pulse 1.4s infinite;margin-bottom:8px}.mini-letter{display:none;text-align:left;background:#fff7fb;border-radius:22px;padding:20px;border:1px solid #ffd1dc;line-height:1.6}.mini-letter.show{display:block;animation:pop .45s ease both}.signature{text-align:right;font-family:Pacifico,cursive;font-size:22px;color:var(--accent)}.tree-wrap{position:relative;width:min(100%,330px);height:300px;margin:8px auto 14px}.tree-img{width:100%;height:100%;object-fit:contain}.tree-heart{position:absolute;border:0;background:white;border-radius:999px;width:46px;height:46px;box-shadow:0 8px 18px rgba(0,0,0,.18);font-size:22px;cursor:pointer;animation:pulse 1.3s infinite}.h1{left:22%;top:20%}.h2{left:58%;top:17%;animation-delay:.2s}.h3{left:33%;top:38%;animation-delay:.4s}.h4{left:70%;top:40%;animation-delay:.6s}.h5{left:40%;top:15%;animation-delay:.6s}.memory-box{background:#fff7fb;border:1px dashed #ff8fab;border-radius:18px;padding:14px;min-height:70px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-weight:600}.soft-hidden{opacity:.35;pointer-events:none}.soft-hidden.ready{opacity:1;pointer-events:auto}.chest{font-size:76px;border:0;background:transparent;cursor:pointer;filter:drop-shadow(0 12px 18px rgba(0,0,0,.18));animation:pulse 1.4s infinite}.final-card code{display:block;background:#fff7fb;border:1px solid #ffd1dc;border-radius:12px;padding:12px;margin:10px 0;color:#7b244f;font-weight:700}hr{border:0;border-top:1px solid #f4c2d7;margin:24px 0}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes pop{from{opacity:0;transform:scale(.94)}to{opacity:1;transform:scale(1)}}@keyframes flicker{from{transform:rotate(-4deg) scale(.96)}to{transform:rotate(5deg) scale(1.06)}}@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.08)}}
@media (max-width:420px){.app-shell{padding-inline:12px}.card{padding:24px 18px;border-radius:24px}h1{font-size:32px}h2{font-size:30px}.scene{padding-top:64px}.cake-area{transform:scale(.9);margin-top:-8px;margin-bottom:-12px}.tree-wrap{height:270px}.primary-btn,.secondary-btn{font-size:15px}}

/* ==============================
   V4 - Fondo e interfaz estilo nube/corazones
   Todo es HTML/CSS, no usa imagen de fondo.
   ============================== */
html,body{
  background:
    radial-gradient(circle at 48% 20%, rgba(255,190,215,.92) 0 0, transparent 31%),
    radial-gradient(circle at 18% 45%, rgba(255,91,155,.34) 0 0, transparent 28%),
    radial-gradient(circle at 82% 55%, rgba(255,96,165,.26) 0 0, transparent 30%),
    linear-gradient(135deg,#351638 0%,#a33968 47%,#401638 100%) !important;
}

/* Anulamos las nubes antiguas y usamos elementos reales para controlarlas mejor */
body:before, body:after{display:none}
.dream-bg{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.dream-bg:before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(circle at 50% 42%, rgba(255,200,220,.22), transparent 22%),
    radial-gradient(circle at 50% 48%, rgba(255,118,170,.22), transparent 45%);
  filter:blur(2px);
}
.cloud{position:absolute;bottom:-85px;border-radius:999px;background:rgba(255,104,166,.34);filter:blur(.2px);box-shadow:inset 0 18px 50px rgba(255,189,213,.18),0 -20px 80px rgba(255,75,150,.16)}
.c1{left:-40px;width:190px;height:190px}.c2{left:85px;width:220px;height:220px;bottom:-112px}.c3{left:245px;width:285px;height:170px;bottom:-105px}.c4{right:260px;width:300px;height:180px;bottom:-112px}.c5{right:75px;width:230px;height:230px;bottom:-120px}.c6{right:-58px;width:205px;height:205px;bottom:-82px}
.float-heart,.spark{position:absolute;color:#ff69a6;text-shadow:0 0 18px rgba(255,135,183,.7);animation:floaty 4s ease-in-out infinite;font-weight:900}.float-heart{font-size:24px}.fh1{left:9%;top:34%;animation-delay:.2s}.fh2{left:15%;top:23%;font-size:18px;animation-delay:1s}.fh3{right:12%;top:22%;font-size:28px;animation-delay:.5s}.fh4{right:18%;top:47%;font-size:24px;animation-delay:1.3s}.fh5{left:86%;top:40%;font-size:18px;animation-delay:2s}.spark{color:#ffd28a;font-size:15px}.sp1{left:11%;top:18%;color:#ffd4e8;font-size:22px}.sp2{left:22%;top:86%;color:#ffd4e8;font-size:20px}.sp3{right:14%;top:31%;font-size:22px}.sp4{left:6%;top:74%}.sp5{right:24%;top:8%}

.corner-btn{position:fixed;top:18px;z-index:5;width:60px;height:60px;border-radius:999px;border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.08);color:#fff;backdrop-filter:blur(9px);box-shadow:0 12px 28px rgba(0,0,0,.12);font-size:28px;font-weight:800;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;text-transform:uppercase;cursor:pointer;opacity:.82}.corner-btn small{font-size:9px;letter-spacing:.08em;font-family:Inter,system-ui}.menu-btn{left:18px}.music-btn{right:18px}.music-btn.playing{background:rgba(255,105,166,.24);box-shadow:0 0 0 5px rgba(255,255,255,.07),0 12px 28px rgba(0,0,0,.12)}

.progress{top:28px;padding:13px 24px;font-size:24px;letter-spacing:12px;background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.30);box-shadow:0 14px 35px rgba(0,0,0,.18), inset 0 1px 0 rgba(255,255,255,.28)}
.app-shell{max-width:900px;padding:78px 18px 30px}.scene{padding:96px 18px 34px}.card{width:min(100%,760px);max-height:calc(100vh - 136px);border-radius:34px;padding:42px 48px;background:linear-gradient(180deg,rgba(255,248,252,.96),rgba(255,238,247,.93));border:1px solid rgba(255,255,255,.76);box-shadow:0 30px 90px rgba(34,8,32,.32);position:relative;overflow:auto}.card:before{content:"♡";position:absolute;top:12px;left:50%;transform:translateX(-50%);font-size:44px;color:#ff7fb3;opacity:.74;font-family:Arial}.card:after{content:"";position:absolute;top:44px;left:50%;width:170px;height:26px;transform:translateX(-50%);background:linear-gradient(90deg,transparent,#ff8fbd,transparent);opacity:.45;clip-path:polygon(0 45%,35% 45%,43% 20%,50% 45%,57% 20%,65% 45%,100% 45%,100% 55%,65% 55%,57% 80%,50% 55%,43% 80%,35% 55%,0 55%);pointer-events:none}.eyebrow{font-size:15px;margin-top:8px;color:#ed2e89}.letter-card h2,.tree-card h2,.final-card h2,.center-card h2{font-size:48px;position:relative;display:inline-block;margin-bottom:22px}.letter-card h2:after,.tree-card h2:after,.final-card h2:after,.center-card h2:after{content:"";position:absolute;left:4%;right:4%;bottom:-6px;height:8px;border-radius:999px;background:linear-gradient(90deg,transparent,#ff74ad,transparent);opacity:.68}.hint{font-size:18px;color:#5d465a}.envelope{width:360px;height:220px;border-radius:0 0 22px 22px;margin-top:26px;box-shadow:0 22px 40px rgba(92,21,65,.22);overflow:visible;background:linear-gradient(180deg,#ff79ad,#f76f9b)}.envelope:before{border-width:110px 180px 0 0;border-color:transparent rgba(255,174,200,.94) transparent transparent}.envelope:after{border-width:110px 0 0 180px;border-color:transparent transparent transparent rgba(255,174,200,.94)}.envelope-flap{border-width:112px 180px 0 180px;border-color:#ff5d97 transparent transparent transparent}.envelope-paper{left:72px;right:72px;top:88px;font-size:28px;padding:20px 8px;border-radius:14px;box-shadow:0 10px 22px rgba(57,10,38,.12)}.tap-helper{background:transparent;color:#fff;text-shadow:0 2px 10px rgba(0,0,0,.25);box-shadow:none;font-size:16px;margin-top:8px}.tap-helper:before{content:"↖";font-size:28px;line-height:1;display:inline-block;transform:rotate(18deg);margin-right:8px}.mini-letter{margin-top:18px}.cake-area{margin-top:24px}.chest{font-size:96px}.primary-btn{max-width:420px;margin-left:auto;margin-right:auto;display:flex;align-items:center;justify-content:center}.intro-card,.center-card,.letter-card,.tree-card,.final-card{animation:cardGlow 5s ease-in-out infinite}
@keyframes floaty{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-12px) scale(1.07)}}
@keyframes cardGlow{0%,100%{box-shadow:0 30px 90px rgba(34,8,32,.32)}50%{box-shadow:0 34px 100px rgba(255,90,160,.25)}}

@media (max-width:700px){
  .corner-btn{display:none}.progress{top:14px;font-size:18px;letter-spacing:5px;padding:9px 15px}.app-shell{max-width:540px;padding:64px 12px 20px}.scene{padding:64px 12px 22px}.card{width:100%;max-height:calc(100vh - 86px);padding:30px 18px;border-radius:26px}.card:before{font-size:34px;top:10px}.card:after{top:34px;width:130px}.letter-card h2,.tree-card h2,.final-card h2,.center-card h2{font-size:32px}.hint{font-size:14px}.envelope{width:210px;height:145px;margin-top:18px;overflow:hidden}.envelope:before{border-width:72px 105px 0 0}.envelope:after{border-width:72px 0 0 105px}.envelope-flap{border-width:75px 105px 0 105px}.envelope-paper{left:28px;right:28px;top:38px;font-size:24px;padding:18px 10px}.tap-helper{font-size:13px}.tap-helper:before{font-size:20px}.cloud{opacity:.9}.c1{left:-80px}.c2{left:20px}.c3{left:145px}.c4{right:120px}.c5{right:-5px}.c6{right:-110px}.float-heart{font-size:18px}.spark{font-size:13px}
}


/* ==============================
   V5 - Modal para PDF y sección Spotify
   ============================== */
.spotify-note{
  margin:22px auto 12px;
  padding:16px;
  max-width:520px;
  display:flex;
  gap:14px;
  align-items:center;
  text-align:left;
  border-radius:22px;
  background:rgba(255,255,255,.62);
  border:1px solid rgba(255,143,189,.45);
}
.spotify-icon{
  width:48px;height:48px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:24px;font-weight:900;
  background:linear-gradient(135deg,#d63384,#ff8fab);
  flex:0 0 48px;
}
.spotify-note h3{margin:0 0 4px;font-size:18px;color:var(--text)}
.spotify-note p{margin:0;color:var(--muted);font-size:14px;line-height:1.45}
.spotify-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;max-width:520px;margin:12px auto 4px}
.spotify-card{background:#fff;border:1px solid #ffd1dc;border-radius:18px;padding:12px;box-shadow:0 10px 25px rgba(92,21,65,.08)}
.spotify-card small{display:block;margin-top:8px;color:var(--accent);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:11px}
.spotify-code{display:block;width:100%;height:58px;border-radius:12px;background:#fff7fb;position:relative;overflow:hidden;border:1px dashed #ff8fab}
.fake-code:before{content:"";position:absolute;inset:13px 16px;background:repeating-linear-gradient(90deg,#d63384 0 4px,transparent 4px 8px,#ff8fab 8px 13px,transparent 13px 18px);border-radius:999px;opacity:.9}
.fake-code:after{content:"♡";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:34px;height:34px;border-radius:50%;background:#fff;display:flex;align-items:center;justify-content:center;color:#d63384;font-size:22px;box-shadow:0 4px 12px rgba(0,0,0,.12)}
.fake-code.alt:before{background:repeating-linear-gradient(90deg,#7b244f 0 5px,transparent 5px 10px,#ff8fab 10px 15px,transparent 15px 21px)}

.pdf-modal{position:fixed;inset:0;z-index:20;display:none;align-items:center;justify-content:center;padding:18px}
.pdf-modal.show{display:flex;animation:fadeIn .22s ease both}
.pdf-backdrop{position:absolute;inset:0;background:rgba(34,8,32,.72);backdrop-filter:blur(8px)}
.pdf-dialog{position:relative;z-index:1;width:min(960px,100%);height:min(92vh,900px);display:flex;flex-direction:column;border-radius:28px;overflow:hidden;background:linear-gradient(180deg,rgba(255,248,252,.98),rgba(255,238,247,.96));box-shadow:0 30px 90px rgba(0,0,0,.38);border:1px solid rgba(255,255,255,.72)}
.pdf-header{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 20px;border-bottom:1px solid rgba(255,143,189,.35);background:rgba(255,255,255,.62)}
.pdf-header .eyebrow{margin:0 0 3px;text-align:left;font-size:11px}.pdf-header h2{margin:0;font-size:28px;text-align:left;font-family:Pacifico,cursive;font-weight:400}.pdf-close{width:44px;height:44px;border:0;border-radius:50%;background:#fff;color:#d63384;font-size:32px;line-height:1;cursor:pointer;box-shadow:0 8px 20px rgba(92,21,65,.12)}
.pdf-frame-wrap{flex:1;min-height:0;background:#fff7fb;padding:12px}.pdf-frame-wrap iframe{width:100%;height:100%;border:0;border-radius:18px;background:white}.pdf-download{width:auto;margin:0 16px 16px;min-height:46px;padding:12px 16px;text-decoration:none}
body.modal-open{overflow:hidden}
@media (max-width:700px){
  .spotify-grid{grid-template-columns:1fr}.spotify-note{align-items:flex-start}.pdf-modal{padding:0}.pdf-dialog{width:100%;height:100%;border-radius:0}.pdf-header{padding:14px 14px}.pdf-header h2{font-size:24px}.pdf-frame-wrap{padding:8px}.pdf-download{margin:0 10px 10px}.pdf-close{width:40px;height:40px;font-size:28px}
}