* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background: radial-gradient(circle at top, #0f1a2c, #05070d);
  color: white;
}

/* HEADER */
.top {
  padding: 30px;
}

.top img {
  max-width: 260px;
}

/* HERO */
.hero {
  text-align: center;
  padding: 60px 20px 80px;
}

.hero h1 {
  font-size: 32px;
  margin-bottom: 10px;
}

.hero p {
  opacity: 0.8;
  font-size: 15px;
}

/* CATEGORÍAS */
.categorias-banners {
  max-width: 1200px;
  margin: 0 auto 80px;
  padding: 0 20px;

  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

/* BANNER */
.banner {
  display: block;
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.banner img {
  width: 100%;
  display: block;
}

.banner:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}