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

body {
  background-color: #fefefe;
  color: #333;
}

header.hero {
  background: linear-gradient(135deg, #7ec8a5, #4f9e79);
  color: white;
  text-align: center;
  padding: 2em 1em;
}

header.hero .logo {
  height: 80px;
  margin: 0 10px;
  vertical-align: middle;
}

nav {
  display: flex;
  justify-content: center;
  gap: 1.5em;
  background: #f3f3f3;
  padding: 1em;
  font-weight: 600;
}

nav a {
  text-decoration: none;
  color: #2b6845;
  transition: color 0.3s ease;
}

nav a:hover {
  color: #7ec8a5;
}

main section {
  max-width: 900px;
  margin: 2em auto;
  padding: 2em;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

h1, h2, h3 {
  color: #2b6845;
  margin-bottom: 1em;
}

p {
  margin-bottom: 1.5em;
  line-height: 1.6em;
}

.tabla-estudiantes {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1em;
}

.tabla-estudiantes th,
.tabla-estudiantes td {
  border: 1px solid #ccc;
  padding: 0.8em;
  text-align: left;
}

.tabla-estudiantes th {
  background-color: #7ec8a5;
  color: white;
}

.tabla-estudiantes tr:nth-child(even) {
  background-color: #f9f9f9;
}

footer {
  text-align: center;
  background-color: #4f9e79;
  color: white;
  padding: 1.2em;
  margin-top: 2em;
}