/* Reset */
* {
  box-sizing: border-box;
}
html, body {
  width: 100%;
  overflow-x: hidden;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  background: #f9fafb;
  color: #222;
}

/* Header con logo centrado */
header {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  border-bottom: 4px solid #0f3460;
  background-color: #1a1a2e;
  color: #f0f0f0;
}
header img {
  max-height: 200px;
  height: auto;
  width: auto;
  display: inline-block;
}
header h1 {
  margin: 0;
  font-weight: 700;
  font-size: 2rem;
  text-align: center;
}

main {
  width: auto;
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem 3rem;
}
section {
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #ddd;
}
section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
h2 {
  color: #0f3460;
  font-weight: 700;
  margin-bottom: 0.75rem;
  border-left: 6px solid #16213e;
  padding-left: 0.75rem;
}
p {
  margin: 0 0 1rem 0;
  text-align: justify;
}
a {
  color: #0f3460;
  text-decoration: none;
}
a:hover,
a:focus {
  text-decoration: underline;
}
footer {
  background: #16213e;
  color: #ccc;
  padding: 1rem 1rem;
  text-align: center;
  font-size: 0.9rem;
}
html {
  scroll-behavior: smooth;
}
nav {
  background-color: #0f3460;
  padding: 0.75rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
}
nav a {
  color: #f0f0f0;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.25rem 0.5rem;
  display: inline-block;
}
nav a:hover,
nav a:focus {
  background: #16213e;
  border-radius: 4px;
}

/* Imágenes responsivas */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Media Queries para móviles */
@media (max-width: 600px) {
  nav ul {
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
  }
  main {
    padding: 0 0.5rem 2rem;
  }
  header h1 {
    font-size: 1.5rem;
  }
  h2 {
    font-size: 1.25rem;
  }
  nav a {
    font-size: 0.9rem;
    padding: 0.3rem 0.6rem;
  }
}