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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-image: url('../img/fondo.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  padding: 40px 20px;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0, 5, 20, 0.72);
  z-index: 0;
}

h1 {
  position: relative;
  z-index: 1;
  color: #e0f0ff;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-align: center;
  margin-bottom: 48px;
  text-shadow: 0 2px 12px rgba(0, 150, 255, 0.5);
}

h1 span {
  color: #38bdf8;
}

.cards-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 1100px;
}

.flip-card {
  width: 300px;
  height: 350px;
  perspective: 1000px;
  cursor: pointer;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
  border-radius: 10px;
}

.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
  box-shadow: 0px 5px 20px rgba(0, 0, 0, 0.8);
}

.flip-card-front {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.card-asir .flip-card-front { background-image: url('../img/ASIR.jpeg'); }
.card-dam  .flip-card-front { background-image: url('../img/DAM.jpeg');  }
.card-daw  .flip-card-front { background-image: url('../img/DAW.jpeg');  }

.flip-card-front .card-title {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 18px 20px;
  background: rgba(0, 0, 0, 0.55);
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: center;
  text-transform: uppercase;
}

.flip-card-back {
  background-color: rgb(3, 35, 54);
  color: #f3f3f3;
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 30px 24px 0;
  text-align: center;
}

.flip-card-back h2 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #38bdf8;
  margin-bottom: 16px;
}

.flip-card-back p {
  font-size: 0.88rem;
  line-height: 1.65;
  color: #d1e8f5;
  flex: 1;
}

.flip-card-back .more-info {
  display: block;
  width: 100%;
  padding: 14px 0;
  margin-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  color: #38bdf8;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.3s ease, background 0.3s ease;
}

.flip-card-back .more-info:hover {
  color: #ffffff;
  background: rgba(56, 189, 248, 0.15);
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.3rem;
    margin-bottom: 32px;
  }

  .cards-container {
    flex-direction: column;
    gap: 24px;
  }

  .flip-card {
    width: 90vw;
    max-width: 340px;
    height: 340px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 28px 12px;
  }

  h1 {
    font-size: 1.1rem;
    margin-bottom: 24px;
  }

  .flip-card {
    width: 95vw;
    height: 320px;
  }

  .flip-card-front .card-title {
    font-size: 1.05rem;
    padding: 14px 16px;
  }

  .flip-card-back h2 {
    font-size: 1.1rem;
  }

  .flip-card-back p {
    font-size: 0.82rem;
  }
}