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

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #2c003e, #6b0052);
  color: #fff;
  font-family: 'Segoe UI', system-ui, sans-serif;
  overflow-x: hidden;
}

.heart-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="red"><path d="M12 21.35l-1.45-1.32C5.4 15.36 2 12.28 2 8.5 2 5.42 4.42 3 7.5 3c1.74 0 3.41.81 4.5 2.09C13.09 3.81 14.76 3 16.5 3 19.58 3 22 5.42 22 8.5c0 3.78-3.4 6.86-8.55 11.54L12 21.35z"/></svg>') repeat;
  background-size: 60px;
  opacity: 0.04;
  animation: floatBg 180s linear infinite;
}

@keyframes floatBg {
  from { background-position: 0 0; }
  to   { background-position: 300px 300px; }
}

.container {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 20px 15px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.title {
  font-family: 'Great Vibes', cursive;
  font-size: 3.8rem;
  color: #ff79cd;
  text-shadow: 0 0 20px rgba(255,105,180,0.7);
  margin: 0 0 1.5rem 0;
  line-height: 1.1;
}

.letter {
  background: rgba(255,255,255,0.09);
  backdrop-filter: blur(8px);
  border-radius: 16px;
  padding: 24px 18px;
  margin: 20px 0;
  border: 1px solid rgba(255,255,255,0.12);
}

p {
  font-size: 1.25rem;
  line-height: 1.65;
  margin: 14px 0;
}

.highlight {
  font-size: 1.4rem;
  color: #ff9eca;
  font-weight: 600;
}

.big-question {
  font-family: 'Dancing Script', cursive;
  font-size: 2.6rem;
  color: #ff4d94;
  margin: 35px 0 45px;
  line-height: 1.2;
  text-shadow: 0 0 15px rgba(255,77,148,0.6);
}

.buttons {
  display: flex;
  flex-direction: column;
  gap: 30px;
  align-items: center;
  margin: 20px 0;
}

.btn {
  font-size: 1.5rem;
  padding: 18px 50px;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: bold;
  min-width: 220px;
  touch-action: manipulation;
}

.yes {
  background: #ff2e63;
  color: white;
  box-shadow: 0 8px 25px rgba(255,46,99,0.5);
}

.yes:active {
  transform: scale(0.96);
}

.yes:hover {
  background: #ff477e;
}

.no {
  background: #555;
  color: #ddd;
  position: relative;
}

.response {
  margin-top: 40px;
  font-size: 1.7rem;
}

.cry {
  font-size: 3rem;
  margin-bottom: 25px;
  color: #ff79cd;
}

.signature {
  margin-top: 40px;
  font-size: 1.5rem;
  color: #ffb3d9;
}

.hidden { display: none; }

/* Animaciones de entrada */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s forwards;
}

.delay-1 { animation-delay: 0.8s; }
.delay-2 { animation-delay: 1.6s; }
.delay-3 { animation-delay: 2.4s; }

@keyframes fadeInUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ── Pantallas más grandes ── */
@media (min-width: 640px) {
  .container { padding: 40px 30px; max-width: 700px; margin: 0 auto; }
  .title       { font-size: 5rem; }
  .big-question { font-size: 3.5rem; }
  .buttons     { flex-direction: row; justify-content: center; gap: 80px; }
  .btn         { font-size: 1.7rem; padding: 20px 70px; min-width: auto; }
  .letter      { padding: 40px 35px; }
  .heart-bg    { opacity: 0.06; background-size: 80px; animation-duration: 180s; }
}

@media (min-width: 1024px) {
  .title       { font-size: 6rem; }
  .big-question { font-size: 4.2rem; }
  .btn         { padding: 22px 90px; font-size: 1.9rem; }
}