/* ==========================================================
   Variables y base
   ========================================================== */
:root{
  --sky: #6FC6E8;
  --sky-light: #E4F6FC;
  --pink: #F6A8C0;
  --pink-deep: #F17FA6;
  --white: #FFFFFF;
  --cream: #FFF9F7;
  --ink: #2E5F73;
  --ink-soft: #4C7C90;
  --panda: #D9713F;
  --shadow: 0 20px 45px -20px rgba(46, 95, 115, 0.35);
  --radius: 22px;
  --font-display: "Baloo 2", sans-serif;
  --font-body: "Quicksand", sans-serif;
}

*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: linear-gradient(180deg, var(--sky-light) 0%, var(--white) 35%, var(--white) 65%, #FFF3F7 100%);
  overflow-x: hidden;
  min-height: 100vh;
}

h1, h2, h3{ font-family: var(--font-display); margin: 0; }
p{ margin: 0; }

button{
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  background: none;
}
button:focus-visible,
a:focus-visible{
  outline: 3px solid var(--sky);
  outline-offset: 3px;
}

.eyebrow{
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: var(--pink-deep);
  margin-bottom: 0.6rem;
}
.center{ text-align: center; }

.section{ padding: 6rem 1.5rem; position: relative; }
.section-inner{ max-width: 880px; margin: 0 auto; position: relative; z-index: 2; }
.section-title{ font-size: clamp(1.8rem, 4vw, 2.6rem); color: var(--ink); margin-bottom: 0.4rem; }
.section-sub{ color: var(--ink-soft); margin-bottom: 2.5rem; font-weight: 500; }

/* ==========================================================
   Fondo ambiental
   ========================================================== */
.bg-ambient{
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.bubble{
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: 0.45;
  animation: float 18s ease-in-out infinite;
}
.b1{ width: 90px; height: 90px; left: 8%; top: 15%; background: var(--pink); animation-duration: 16s; }
.b2{ width: 140px; height: 140px; right: 10%; top: 30%; background: var(--sky); animation-duration: 22s; animation-delay: -4s; }
.b3{ width: 60px; height: 60px; left: 20%; top: 65%; background: var(--pink); animation-duration: 14s; animation-delay: -8s; }
.b4{ width: 110px; height: 110px; right: 18%; top: 78%; background: var(--sky); animation-duration: 20s; animation-delay: -2s; }
.b5{ width: 70px; height: 70px; left: 45%; top: 8%; background: var(--pink-deep); opacity: 0.25; animation-duration: 19s; animation-delay: -10s; }

@keyframes float{
  0%, 100%{ transform: translate(0,0) scale(1); }
  50%{ transform: translate(20px,-30px) scale(1.08); }
}

/* ==========================================================
   HERO
   ========================================================== */
.hero{
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  z-index: 1;
}

.envelope-stage{
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.envelope-stage.hidden{
  opacity: 0;
  transform: scale(0.9);
  pointer-events: none;
  position: absolute;
}

.envelope-label{
  font-family: var(--font-display);
  color: var(--ink-soft);
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}
.envelope-name{
  font-size: clamp(2.6rem, 8vw, 4.2rem);
  color: var(--pink-deep);
  margin-bottom: 2rem;
}

.seal-btn{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  background: var(--white);
  padding: 1.6rem 2.2rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.seal-btn:hover{ transform: translateY(-4px); box-shadow: 0 26px 50px -18px rgba(241,127,166,0.45); }
.seal{ display: block; animation: pulse 2.4s ease-in-out infinite; }
.seal-text{ font-family: var(--font-display); font-weight: 600; color: var(--ink); font-size: 1.05rem; }

@keyframes pulse{
  0%, 100%{ transform: scale(1); }
  50%{ transform: scale(1.08); }
}

.hero-reveal{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s ease, transform 0.8s ease;
  pointer-events: none;
  position: absolute;
}
.hero-reveal.visible{
  opacity: 1;
  transform: translateY(0);
  position: relative;
  pointer-events: auto;
}

.hero-title{
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  line-height: 1.15;
  color: var(--ink);
  margin: 0.6rem 0 1.6rem;
}
.hero-title .highlight{ color: var(--pink-deep); }

.age-badge{
  display: inline-flex;
  align-items: baseline;
  gap: 0.7rem;
  background: var(--white);
  padding: 1rem 1.8rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
  margin-bottom: 2.6rem;
}
.age-number{
  font-family: var(--font-display);
  font-size: 2.6rem;
  color: var(--sky);
  font-weight: 800;
}
.age-label{ font-weight: 600; color: var(--ink-soft); }

.scroll-cue{
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-soft);
  font-weight: 600;
  border: 2px solid var(--sky);
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}
.scroll-cue:hover{ background: var(--sky); color: var(--white); }
.scroll-cue svg{ animation: bounce 1.6s ease-in-out infinite; }

@keyframes bounce{
  0%, 100%{ transform: translateY(0); }
  50%{ transform: translateY(4px); }
}

/* ==========================================================
   CARTA
   ========================================================== */
.letter-card{
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1.6rem, 5vw, 3.2rem);
  position: relative;
  border: 2px dashed var(--pink);
}
.letter-icon{ font-size: 2.4rem; margin-bottom: 1rem; }
.letter-text p{
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.7;
  margin-bottom: 1.1rem;
  color: var(--ink);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.letter-text p.shown{ opacity: 1; transform: translateY(0); }
.letter-text .signoff{
  font-family: var(--font-display);
  color: var(--pink-deep);
  font-size: 1.3rem;
  margin-top: 1rem;
}

/* ==========================================================
   RAZONES (tarjetas)
   ========================================================== */
.cards-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}
.reason-card{
  perspective: 1000px;
  height: 150px;
}
.reason-card-inner{
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(.4,.2,.2,1);
  transform-style: preserve-3d;
}
.reason-card.flipped .reason-card-inner{ transform: rotateY(180deg); }
.reason-face{
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.8rem;
  text-align: center;
  box-shadow: var(--shadow);
}
.reason-front{
  background: linear-gradient(160deg, var(--sky) 0%, var(--pink) 100%);
  color: var(--white);
}
.reason-front .num{ font-family: var(--font-display); font-size: 1.8rem; font-weight: 700; }
.reason-front .heart{ font-size: 1.1rem; margin-top: 0.2rem; }
.reason-back{
  background: var(--white);
  transform: rotateY(180deg);
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--ink);
  border: 2px solid var(--pink-light, var(--pink));
}
.reason-card button.reason-hit{
  position: absolute;
  inset: 0;
  z-index: 3;
  background: transparent;
}

/* ==========================================================
   TARTA
   ========================================================== */
.tarta-section .section-inner{ display: flex; flex-direction: column; align-items: center; }
.cake-wrap{ position: relative; margin-bottom: 1.6rem; }
.flame{ transform-origin: 110px 78px; animation: flicker 1.6s ease-in-out infinite; }
.flame.out{ animation: none; opacity: 0; transition: opacity 0.4s ease; }
@keyframes flicker{
  0%, 100%{ transform: scale(1) rotate(-2deg); }
  50%{ transform: scale(1.08) rotate(3deg); }
}
.smoke{
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--ink-soft);
  opacity: 0;
  font-size: 1.4rem;
  transition: opacity 0.6s ease, transform 1.2s ease;
}
.smoke.show{ opacity: 0.6; transform: translate(-50%, -20px); }

.btn-primary{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--white);
  background: linear-gradient(135deg, var(--pink-deep), var(--sky));
  padding: 0.9rem 2rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}
.btn-primary:hover{ transform: translateY(-3px); }
.btn-primary:disabled{ opacity: 0.55; cursor: default; transform: none; }

.wish-msg{
  margin-top: 1.4rem;
  font-family: var(--font-display);
  color: var(--pink-deep);
  font-size: 1.2rem;
  min-height: 1.6rem;
  text-align: center;
}

/* ==========================================================
   JUEGO
   ========================================================== */
.game-hud{
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}
.game-area{
  position: relative;
  height: 340px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.game-start{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--white);
  background: var(--sky);
  padding: 0.9rem 2rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}
.game-start:hover{ transform: translateY(-3px); }
.falling-heart{
  position: absolute;
  top: -40px;
  font-size: 1.8rem;
  background: none;
  animation: fall linear forwards;
  will-change: transform;
}
@keyframes fall{
  to{ transform: translateY(380px); }
}
.game-result{
  margin-top: 1.2rem;
  font-family: var(--font-display);
  color: var(--pink-deep);
  font-size: 1.15rem;
  text-align: center;
  min-height: 1.6rem;
}

/* ==========================================================
   FINAL
   ========================================================== */
.final-section{ padding-bottom: 4rem; }
.final-card{
  background: linear-gradient(160deg, var(--sky-light), var(--white));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(2rem, 6vw, 3.5rem);
  text-align: center;
}
.final-text{
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  line-height: 1.7;
  color: var(--ink);
  margin-bottom: 1.4rem;
}
.final-big{
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: var(--pink-deep);
}
.final-sign{
  margin-top: 1.4rem;
  font-weight: 700;
  color: var(--ink-soft);
}

.footer{
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: var(--ink-soft);
  font-weight: 600;
  position: relative;
  z-index: 1;
}

/* ==========================================================
   Easter egg: panda
   ========================================================== */
.paw-secret{
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--white);
  color: var(--sky);
  box-shadow: 0 8px 20px -8px rgba(46,95,115,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.35;
  z-index: 40;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.paw-secret:hover{ opacity: 0.9; transform: scale(1.08); }

.panda-modal{
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
.panda-modal.open{ display: flex; }
.panda-modal-backdrop{
  position: absolute;
  inset: 0;
  background: rgba(46, 95, 115, 0.45);
  backdrop-filter: blur(3px);
}
.panda-card{
  position: relative;
  background: var(--white);
  border-radius: 28px;
  padding: 2rem 1.8rem 1.6rem;
  max-width: 340px;
  width: 100%;
  text-align: center;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.4);
  animation: popIn 0.4s cubic-bezier(.2,.9,.3,1.3);
}
@keyframes popIn{
  from{ opacity: 0; transform: scale(0.8) translateY(20px); }
  to{ opacity: 1; transform: scale(1) translateY(0); }
}
.panda-close{
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 1.1rem;
  color: var(--ink-soft);
}
.panda-bubble{
  margin-top: 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--panda);
  background: #FFF1E8;
  border-radius: 16px;
  padding: 0.7rem 1rem;
}
.panda-caption{
  margin-top: 0.6rem;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.9rem;
}

#confettiCanvas{
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 90;
  width: 100%;
  height: 100%;
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 560px){
  .section{ padding: 4rem 1.1rem; }
  .cards-grid{ grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .game-area{ height: 300px; }
}

/* ==========================================================
   Accesibilidad: reduce motion
   ========================================================== */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  .bubble, .seal, .scroll-cue svg, .flame, .falling-heart{ animation: none !important; }
  *{ transition-duration: 0.01ms !important; }
}