* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: Arial, sans-serif; background-color: #f4f7f6; color: #333; line-height: 1.6; }

/* Navegación */
header { background-color: #2c3e50; padding: 1rem 0; }
.menu { list-style: none; display: flex; justify-content: center; gap: 20px; }
.menu li a { color: #fff; text-decoration: none; font-weight: bold; padding: 10px 20px; border-radius: 5px; transition: background 0.3s; }
.menu li a:hover { background-color: #34495e; }

/* Contenedor Principal */
.container { max-width: 1000px; margin: 2rem auto; padding: 0 20px; }
h1 { margin-bottom: 10px; color: #2c3e50; }
p { margin-bottom: 20px; }

/* Contenedor del PDF */
.pdf-container { border: 1px solid #ccc; border-radius: 8px; overflow: hidden; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }

/* Galería de Certificados */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
.cert-item { background: #fff; padding: 10px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); text-align: center; }
.cert-item img { max-width: 100%; height: auto; border-radius: 4px; display: block; }
.pdf-icon { font-size: 50px; margin: 20px 0; }
.btn-view { display: inline-block; padding: 8px 15px; background: #3498db; color: #fff; text-decoration: none; border-radius: 4px; }
.btn-view:hover { background: #2980b9; }

/* Footer */
footer { text-align: center; padding: 20px 0; margin-top: 40px; color: #7f8c8d; }