:root {
  --navy: #003d82;
  --naranja: #ff9d00;
  --gris-texto: #333333;
  --gris-suave: #f4f6f9;
  --blanco: #ffffff;
  --borde: #e2e6ec;
}

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

body {
  font-family: Arial, Helvetica, sans-serif;
  color: var(--gris-texto);
  background-color: var(--gris-suave);
  line-height: 1.6;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
}

main > h1 {
  color: var(--navy);
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}

main > h1::after {
  content: "";
  display: block;
  width: 70px;
  height: 4px;
  background-color: var(--naranja);
  border-radius: 2px;
  margin-top: 0.6rem;
}

.intro {
  max-width: 720px;
  margin-bottom: 2.5rem;
  color: #555555;
  font-size: 1.05rem;
}

.filtros {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.5rem;
}

.filtro-btn {
  border: 2px solid var(--navy);
  background-color: transparent;
  color: var(--navy);
  font-weight: bold;
  font-size: 0.9rem;
  padding: 0.5rem 1.2rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.filtro-btn:hover {
  background-color: rgba(0, 61, 130, 0.08);
}

.filtro-btn.activo {
  background-color: var(--navy);
  color: var(--blanco);
}

.oculto {
  display: none;
}

section {
  margin-bottom: 3rem;
}

section h2 {
  color: var(--navy);
  border-bottom: 3px solid var(--naranja);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.eventos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.evento {
  background-color: var(--blanco);
  border: 1px solid var(--borde);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.25s ease;
}

.evento.pre-animacion {
  opacity: 0;
  transform: translateY(24px);
}

.evento:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.13);
}

.evento img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.4s ease;
}

.evento:hover img {
  transform: scale(1.05);
}

.evento-info {
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.evento-info h3 {
  color: var(--navy);
  font-size: 1.15rem;
}

.meta {
  color: var(--naranja);
  font-weight: bold;
  font-size: 0.9rem;
}

a:focus-visible,
.filtro-btn:focus-visible {
  outline: 3px solid var(--naranja);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .evento,
  .evento.pre-animacion,
  .evento img {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 640px) {
  main {
    padding: 1.5rem 1.2rem;
  }

  main > h1 {
    font-size: 1.8rem;
  }
}