/* Variables de tema */
:root {
  --bg-dark: #121212;
  --bg-gradient-start: #121212;
  --bg-gradient-end: #000;
  --main-red: #e50000;
  --text-light: #f7f7f7;
  --text-dark: #333;
}

/* Reset de estilos */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Fondo dinámico con degradado animado */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at 50% 50%, var(--bg-gradient-start), var(--bg-gradient-end) 80%);
  color: var(--text-dark);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  animation: bgShift 20s infinite alternate;
}
@keyframes bgShift {
  to { background-position: 100% 100%; }
}

/* Encabezado con diseño neón animado */
header {
  background-color: var(--bg-dark);
  color: var(--text-light);
  width: 100%; padding: 20px 0;
  margin-bottom: 30px;
  text-align: center;
  border-radius: 0 0 20px 20px;
  box-shadow: 0 4px 10px rgba(218, 0, 0, 0.8);
}
header h1 {
  font-size: 2.5em;
  letter-spacing: 3px;
  text-transform: uppercase;
  text-shadow: 0 0 8px var(--main-red), 0 0 16px var(--text-light);
  animation: neonPulse 3s ease-in-out infinite;
}
@keyframes neonPulse {
  0%, 100% { text-shadow: 0 0 4px var(--main-red), 0 0 8px var(--text-light); }
  50%      { text-shadow: 0 0 12px var(--main-red), 0 0 24px var(--text-light); }
}

/* Controles y estadísticas con estilo retro-futurista */
.controls {
  margin-bottom: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  align-items: center;
  justify-content: center;
}
.controls select,
.controls button {
  padding: 10px 15px;
  font-size: 16px;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  background-color: var(--bg-dark);
  color: var(--text-light);
  box-shadow: 0 0 10px var(--main-red);
  transition: all 0.3s ease;
}
.controls button:hover,
.controls select:hover {
  color:#121212;
  background: linear-gradient(45deg, var(--main-red), #ff4d4d);
  transform: scale(1.1);
  box-shadow: 0 0 15px var(--text-light);
}
.stats span {
  background: rgba(255, 0, 0, 0.6);
  margin: 5px;
  padding: 8px 12px;
  border-radius: 50px;
  font-family: 'Courier New', monospace;
  color: var(--text-light);
  font-size: 18px;
  font-weight: bold;
  box-shadow: 0 0 6px var(--main-red);
}

/* Tablero de juego */
.game-board {
  width: 90vw;
  max-width: 600px;
  margin: auto;
  display: grid;
  gap: 15px;
  justify-content: center;
}

/* Tarjetas con efecto flip y entrada animada */
.card {
  width: 140px;
  height: 200px;
  perspective: 1000px;
  border-radius: 30px;
  opacity: 0;
  transform: translateY(-50px) rotate(-10deg);
  animation: deal 0.6s forwards;
}
.card:hover {
  cursor: pointer;
  border-radius: 15px;
  transform: scale(1.05) rotate3d(1, 1, 1, 10deg);
}
.card:nth-child(4n+1) { animation-delay: 0.1s; }
.card:nth-child(4n+2) { animation-delay: 0.2s; }
.card:nth-child(4n+3) { animation-delay: 0.3s; }
.card:nth-child(4n+4) { animation-delay: 0.4s; }
@keyframes deal {
  to {
    opacity: 1;
    transform: translateY(0) rotate(0);
  }
}
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  border-radius: 25px;
}
.card.flipped .card-inner {
  transform: rotateY(180deg);
}
.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border: 2px solid var(--main-red);
  border-radius: 15px;
  box-shadow: 0 4px 8px rgba(182, 0, 0, 0.575);
}
.card-face.card-back {
  background: #ff000071 url('corazon.png') no-repeat center center;
  background-size: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 25px;
}
.card-face.card-front {
  transform: rotateY(180deg);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  box-shadow:
    0 8px 16px rgba(0,0,0,0.5),
    inset 0 2px 4px rgba(255,255,255,0.2);
}

/* Animación shake para errores */
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}
.card.error .card-inner {
  animation: shake 0.4s;
}

/* Estilos personalizados para el modal de victoria */
.modal {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  
}
.modal.show {
  opacity: 1;
  pointer-events: all;
}
.modal-content {
  background: #6e0101;
  color: #f7f7f7;
  padding: 40px;
  border-radius: 50px;
  text-align: center;
  transform: scale(0.8);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.8);
}
.modal.show .modal-content {
  transform: scale(1);
  opacity: 1;
}
.modal-content h2 {
  font-size: 2.5em;
  margin-bottom: 10px;
  color: var(--main-red);
  text-shadow: 0 0 4px var(--main-red);
}
.modal-content p {
  font-size: 1.2em;
  margin: 20px 0;
  color: #f7f7f7;
}
.modal-content button {
  background: linear-gradient(45deg, var(--main-red), #ff4d4d);
  color: var(--text-light);
  padding: 12px 24px;
  font-size: 1em;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s ease;
}
.modal-content button:hover {
  transform: scale(1.05);
}

/* Responsividad para móviles */
@media (max-width: 600px) {
  .card {
    width: 90px;
    height: 130px;
  }
  .controls select,
  .controls button {
    padding: 8px 12px;
    font-size: 14px;
  }
  .stats span {
    font-size: 16px;
  }
}