:root {
  --nav-height: 50px;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  font-family: sans-serif;
  background: url("img/fondo-mascotas.jpg") no-repeat center center fixed;
  background-size: cover;
  color: #333;
}

.nav-wrapper {
  max-width: 1200px;
  margin: 0 auto;
}

nav {
  display: flex;
  justify-content: center;
  gap: 1px;
  padding: 5px 0;
  margin: 25px auto 0;
  max-width: 1200px;
}

nav a {
  color: #FFA500;
  border: 1px solid rgba(0, 0, 0, 0.3);
  background-color: rgba(0, 0, 0, 0.4);
  text-decoration: none;
  font-weight: bold;
  font-size: 16px;
  padding: 4px 16px;
  border-radius: 6px;
  transition: all 0.3s ease;
  cursor: pointer;
  backdrop-filter: blur(2px);
  box-shadow: none;
  user-select: none;
  min-width: 140px;
  text-align: center;
}

nav a:hover {
  background-color: rgba(0, 60, 0, 0.7);
  box-shadow: 0 0 8px rgba(255, 165, 0, 0.6);
  color: #fff;
}

nav a:active {
  box-shadow: 0 0 12px 4px rgba(255, 255, 255, 0.7);
  transform: scale(1.03);
  background-color: rgba(0, 60, 0, 0.9);
}

header {
  text-align: center;
  padding: 0.5rem 1rem;
  margin: 80px auto 30px auto;
  width: max-content;
  backdrop-filter: blur(2px);
}

h1 {
  margin: 0;
  font-size: 5rem;
  color: #FFA500;
  text-shadow: 2px 2px 3px black;
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* === Galería centrada robusta en todos los tamaños === */
.image-gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;      /* centra horizontalmente las tarjetas */
  align-items: center;          /* alinea verticalmente dentro de cada fila */
  gap: 15px;
  padding: 40px 20px;
  max-width: 1200px;
  width: 100%;                  /* evita quedarse estrecha y “pegarse” a la derecha */
  margin: 0 auto;
  text-align: center;           /* centra textos/botones dentro */
}

.image-item {
  position: relative;
  width: 220px;
  height: 260px;
  flex: 0 1 220px;              /* puede encoger hasta 220px si es necesario */
  display: flex;
  flex-direction: column;
  align-items: center;
  box-sizing: border-box;
  overflow: visible;
  padding-top: 10px;

  /* Asegura centrado de cada tarjeta */
  margin-inline: auto;          /* centrado robusto */
  align-self: center;
}

.image-item img {
  width: auto;
  max-width: 200px;
  max-height: 200px;
  height: auto;
  border: 2px solid #FFA500;
  display: block;
  margin: 0 auto;               /* centra la imagen dentro del contenedor */
}

.image-item button {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(0, 0, 0, 0.4);
  color: #FFA500;
  border: none;
  padding: 4px 16px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  backdrop-filter: blur(2px);
  transition: all 0.3s ease;
  white-space: nowrap;
  user-select: none;
  border-radius: 6px;
}

.image-item button:hover {
  background-color: rgba(0, 60, 0, 0.9);
  box-shadow: 0 0 8px rgba(255, 165, 0, 0.6);
  color: #fff;
}

.image-item button:active {
  box-shadow: 0 0 12px 4px rgba(255, 255, 255, 0.7);
  transform: translateX(-50%) scale(1.03);
}

footer {
  color: #FFA500;
  text-align: center;
  padding: 4px 20px;
  margin: 40px auto 20px auto;
  font-size: 14px;
  width: fit-content;
  backdrop-filter: blur(2px);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1px;
  margin-bottom: 10px;
  flex-wrap: nowrap;
}

.footer-links a {
  flex: 0 0 auto;
  width: 220px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFA500;
  border: 1px solid rgba(0, 0, 0, 0.3);
  background-color: rgba(0, 0, 0, 0.6);
  text-decoration: none;
  font-weight: bold;
  font-size: 16px;
  border-radius: 6px;
  transition: all 0.3s ease;
  cursor: pointer;
  backdrop-filter: blur(2px);
  user-select: none;
  white-space: nowrap;
  box-sizing: border-box;
  text-align: center;
  padding: 0 10px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.footer-links a:hover {
  background-color: rgba(0, 60, 0, 0.7);
  box-shadow: 0 0 8px rgba(255, 165, 0, 0.6);
  color: #fff;
}

.footer-links a:active {
  box-shadow: 0 0 12px 4px rgba(255, 255, 255, 0.7);
  transform: scale(1.03);
  background-color: rgba(0, 60, 0, 0.9);
}

footer p:last-of-type {
  display: inline-block;
  background-color: rgba(0, 0, 0, 0.4);
  padding: 4px 8px;
  border-radius: 6px;
  margin-top: 10px;
  color: #FFA500;
}

/* Tablet */
@media (max-width: 992px) {
  .nav-wrapper {
    width: 90%;
  }

  nav {
    flex-wrap: wrap;
    gap: 15px;
    padding: 10px;
  }

  header {
    width: 80%;
    padding: 1rem;
  }

  h1 {
    font-size: 2.5rem;
  }

  .image-item {
    width: calc(50% - 30px);
    max-width: 250px;
    height: 280px;
    margin-inline: auto;     /* asegura centrado también en tablet */
  }

  footer {
    width: 80%;
    padding: 10px 20px;
  }
}

/* Celulares medianos */
@media (max-width: 768px) {
  header {
    width: 90%;
    padding: 1rem;
  }

  h1 {
    font-size: 2.2rem;
  }

  .image-item {
    width: calc(50% - 25px);
    height: 250px;
    margin-inline: auto;     /* centrado en móviles medianos */
  }

  footer {
    width: 90%;
  }
}

/* Celulares pequeños */
@media (max-width: 576px) {
  .nav-wrapper {
    width: 95%;
  }

  nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 5px;
    padding: 10px;
    justify-items: center;
  }

  nav a {
    font-size: 15px;
    padding: 5px 0;
    width: 100%;
    max-width: 160px;
  }

  header {
    width: 95%;
    margin: calc(var(--nav-height) + 20px) auto 15px auto;
    padding: 0.8rem;
  }

  h1 {
    font-size: 1.8rem;
  }

  main {
    padding: 10px 5px;
  }

  .image-gallery {
    /* Forzar centrado en móviles incluso tras recargar */
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;

    gap: 15px;
    padding: 0 10px;
    text-align: center;
    width: 100%;
  }

  .image-item {
    width: 90%;
    height: 280px;
    margin-inline: auto !important;  /* centra la tarjeta */
    align-self: center !important;
  }

  .image-item img {
    height: 100%;
    object-fit: cover;
    margin: 0 auto;                   /* asegura centrado de la imagen */
    display: block;
  }

  .image-item button {
    font-size: 15px;
    padding: 10px 20px;
  }

  footer {
    width: 95%;
    margin: 20px auto;
    padding: 8px 10px;
  }

  .footer-links {
    flex-direction: column;
    align-items: center;
  }

  .footer-links a {
    max-width: 100%;
    width: 100%;
  }
}