/* Paleta vibrante */
:root {
  --primary: #0a3d62;
  --secondary: #38ada9;
  --accent: #e58e26;
  --light: #f1f2f6;
  --dark: #222;
}

body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: var(--light);
  color: var(--dark);
}

header {
  background: var(--primary);
  color: white;
  padding: 1rem;
  position: sticky;
  top: 0;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
}

nav a {
  color: white;
  text-decoration: none;
  transition: color 0.3s;
}

nav a:hover {
  color: var(--accent);
}

#hero {
  background: linear-gradient(to right, var(--secondary), var(--accent));
  color: white;
  text-align: center;
  padding: 5rem 2rem;
  animation: fadeIn 2s ease-in;
}

#hero button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 1rem 2rem;
  margin-top: 1rem;
  border-radius: 5px;
  cursor: pointer;
  transition: transform 0.3s;
}

#hero button:hover {
  transform: scale(1.1);
  background: var(--accent);
}

.cards {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
  padding: 2rem;
}

.card {
  background: white;
  padding: 1rem;
  border-radius: 8px;
  width: 250px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-10px);
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 400px;
  margin: auto;
  padding: 2rem;
}

form input, form select, form button {
  padding: 0.8rem;
  border: 1px solid #ccc;
  border-radius: 5px;
}

form button {
  background: var(--secondary);
  color: white;
  cursor: pointer;
}

form button:hover {
  background: var(--accent);
}

footer {
  background: var(--dark);
  color: white;
  text-align: center;
  padding: 1rem;
}

.social a {
  color: white;
  margin: 0 0.5rem;
  transition: color 0.3s;
}

.social a:hover {
  color: var(--accent);
}

@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
  }
  .cards {
    flex-direction: column;
  }
}

@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity: 1;}
}

/* Ajuste general de las imágenes de ponentes */
#ponentes img {
  width: 250px;           /* Tamaño fijo */
  height: 250px;          /* Altura fija */
  object-fit: cover;      /* Recorta sin deformar */
  border-radius: 10px;    /* Bordes redondeados */
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  transition: transform 0.3s ease;
}

/* Efecto hover */
#ponentes img:hover {
  transform: scale(1.05);
}

/* Centrado y ajuste responsive */
.cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

@media (max-width: 768px) {
  #ponentes img {
    width: 200px;
    height: 200px;
  }
}

@media (max-width: 480px) {
  #ponentes img {
    width: 150px;
    height: 150px;
  }
}