html, body {
  margin: 0;
  padding: 0;
  height: 100%;          
  font-family: sans-serif;
  text-align: center;
  background-color: #1e1e1e;
  color: #ddd;
  overflow-x: hidden;
}

 header {
      color: white;
      padding: 1rem;
      
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    header a {
      margin-top: 30px;
      position: absolute;
      left: 20px;
      }

    header img {
      height: 100px;
      width: 100px;
    }

    header h1 {
       margin: 0;
        background-color: #3498db;
        color: white;
        padding: 10px 20px;
        border-radius: 8px; 
    }
    
#botonesPDF {
  padding: 10px;
  background-color: #1e1e1e;
}

#pdf-container {
  width: 100%;
  height: calc(100% - 60px); /* resta el alto de los botones */
}

#visorPDF {
  width: 100%;
  height: 100%;
  border: none;
}

button {
  margin: 5px;
  font-size: 16px;
  cursor: pointer;
  background-color: #444;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
}

button:hover {
  background-color: #4db8ff;
}

/*Pag principal*/

h1 {
  text-align: center;
  margin-top: 30px;
  font-size: 2.5rem;
  color: #60a5fa;
  letter-spacing: 2px;
}

h2 {
  text-align: center;
  color: #a5b4fc;
  margin-bottom: 20px;
}

.planEstudio h3 {
  text-align: center;
  color: #2563eb;
  margin-top: 40px;
}

table {
  margin: 30px auto;
  border-collapse: collapse;
  background: #232946;
  box-shadow: 0 2px 12px rgba(96,165,250,0.10);
  border-radius: 12px;
  overflow: hidden;
}

th, td {
  border: 1px solid #334155;
  padding: 12px 18px;
  text-align: center;
  color: #e0e7ff;
}

th {
  background-color: #2563eb;
  color: #fff;
  font-weight: 600;
}

tr:nth-child(even) {
  background-color: #232946;
}

tr:hover {
  background-color: #1e293b;
}

.link-materia {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: #60a5fa;
  gap: 8px;
  padding: 18px 24px;
  border-radius: 16px;
  background: #232946;
  margin: 18px 12px;
  box-shadow: 0 2px 8px rgba(96,165,250,0.10);
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.link-materia:hover {
  background-color: #1e293b;
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 6px 18px rgba(96,165,250,0.18);
}

.link-materia img {
  width: 80px;
  height: 80px;
  border-radius: 12px;
  background: #181f2a;
  box-shadow: 0 1px 4px rgba(96,165,250,0.10);
}

.link-materia span {
  font-size: 1.1rem;
  font-weight: 500;
  margin-top: 6px;
}

@media (max-width: 700px) {
  table, th, td {
    font-size: 0.95rem;
    padding: 8px 6px;
  }
  .link-materia {
    padding: 12px 8px;
    margin: 10px 4px;
  }
  /*Fin pag principal*/