body {
     font-family: 'Roboto', sans-serif;
     background-color: #f5f5f5;
     margin: 0;
 }

 header {
     background-color: #2c3e50;
     color: white;
     padding: 1rem;
 }

 header .navbar-brand {
     color: white;
     font-weight: 500;
 }

 header .btn {
     border-radius: 8px;
 }

 nav {
     background-color: #34495e;
     min-height: 100%;
     padding: 1rem;
     display: flex;
     flex-direction: column;
     gap: 1rem;
 }

 nav button {
     background-color: #2c3e50;
     color: #ecf0f1;
     border: none;
     padding: 0.8rem 1rem;
     border-radius: 8px;
     text-align: left;
     transition: background-color 0.3s ease, transform 0.2s ease;
 }

 nav button:hover {
     background-color: #1abc9c;
     transform: translateX(5px);
 }

 main {
     background-color: #ecf0f1;
     flex-grow: 1;
     padding: 2rem;
     display: flex;
     justify-content: center;
     align-items: center;
 }

 iframe {
     width: 90%;
     height: 85vh;
     border: none;
     border-radius: 12px;
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
 }

 @media (max-width: 768px) {
     nav {
         flex-direction: row;
         overflow-x: auto;
         padding: 0.5rem;
         gap: 0.5rem;
     }

     nav button {
         flex: 1;
         text-align: center;
         padding: 0.5rem;
     }

     iframe {
         width: 100%;
     }
 }

 .btn-primary {
     background-color: #1F4E78;
     /* Azul Grisáceo */
     border-color: #1F4E78;
     color: #FFFFFF;
     border-radius: 8px;
     font-weight: 500;
     /* padding: 0.6rem 1.2rem; */
     transition: all 0.3s ease;
 }

 .btn-primary:hover {
     background-color: #143D59;
     /* Azul Oscuro */
     border-color: #143D59;
 }

 .btn-primary:focus,
 .btn-primary:active {
     background-color: #112E47;
     /* Azul aún más oscuro */
     border-color: #112E47;
     box-shadow: 0 0 0 0.2rem rgba(31, 78, 120, 0.5);
 }

 .btn-primary:disabled,
 .btn-primary.disabled {
     background-color: #8DA0B3;
     /* Gris Plateado Suave */
     border-color: #8DA0B3;
     color: #FFFFFF;
     opacity: 0.65;
     cursor: not-allowed;
 }

 /* Botones secundarios */
 .btn-outline-secondary {
     background-color: transparent;
     border-color: #8DA0B3;
     /* Gris Plateado */
     color: #8DA0B3;
     border-radius: 8px;
     font-weight: 500;
     /* padding: 0.6rem 1.2rem; */
     transition: all 0.3s ease;
 }

 .btn-outline-secondary:hover {
     background-color: #8DA0B3;
     color: #FFFFFF;
 }

 .btn-outline-secondary:focus,
 .btn-outline-secondary:active {
     background-color: #738491;
     /* Gris Plateado Oscuro */
     color: #FFFFFF;
     border-color: #738491;
     box-shadow: 0 0 0 0.2rem rgba(141, 160, 179, 0.5);
 }

 .btn-outline-secondary:disabled,
 .btn-outline-secondary.disabled {
     background-color: transparent;
     border-color: #C7CED5;
     /* Gris más claro */
     color: #C7CED5;
     opacity: 0.65;
     cursor: not-allowed;
 }

 /* Botones de peligro */
 .btn-danger {
     background-color: #B53F3F;
     /* Rojo Granate */
     border-color: #B53F3F;
     color: #FFFFFF;
     border-radius: 8px;
     font-weight: 500;
     /* padding: 0.6rem 1.2rem; */
     transition: all 0.3s ease;
 }

 .btn-danger:hover {
     background-color: #9A3535;
     /* Rojo más oscuro */
     border-color: #9A3535;
 }

 .btn-danger:focus,
 .btn-danger:active {
     background-color: #812B2B;
     /* Rojo intenso */
     border-color: #812B2B;
     box-shadow: 0 0 0 0.2rem rgba(181, 63, 63, 0.5);
 }

 .btn-danger:disabled,
 .btn-danger.disabled {
     background-color: #E8C7C7;
     /* Rojo claro apagado */
     border-color: #E8C7C7;
     color: #FFFFFF;
     opacity: 0.65;
     cursor: not-allowed;
 }

 /* Botones suaves */
 .btn-light {
     background-color: #F4F5F7;
     /* Blanco Humo */
     border-color: #F4F5F7;
     color: #1F4E78;
     /* Azul Grisáceo */
     border-radius: 8px;
     font-weight: 500;
     padding: 0.6rem 1.2rem;
     transition: all 0.3s ease;
 }

 .btn-light:hover {
     background-color: #E0E3E7;
     /* Blanco Humo más oscuro */
     border-color: #E0E3E7;
 }

 .btn-light:focus,
 .btn-light:active {
     background-color: #C7CED5;
     /* Blanco Humo intenso */
     border-color: #C7CED5;
     box-shadow: 0 0 0 0.2rem rgba(244, 245, 247, 0.5);
 }

 .btn-light:disabled,
 .btn-light.disabled {
     background-color: #ECEEEF;
     /* Blanco Humo más claro */
     border-color: #ECEEEF;
     color: #C7CED5;
     opacity: 0.65;
     cursor: not-allowed;
 }