header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background-color: #FFFFFF;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
  }
  .logo {
    width: 50%;
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    align-items: end;
    text-decoration: none;
    color: #0033A0;
  }
  .logo img {
    height: 80px;
    margin-right: 15px;
  }
  nav a {
    margin: 0 1.2rem;
    padding: 0.4rem 0.8rem;
    text-decoration: none;
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    color: #0a3360;
  }
  .dashboard-link, .dashboard-link:active {
    background-color: #1e2d5a;
    color: white;
    padding: 0.3rem 0.6rem;
  }
  .dashboard-links, .dashboard-links:active {
    color: #3d6bcf;
    padding: 0.3rem 0.6rem;
  }
  .active {
    color: white;
    background-color: #1e2d5a;
    padding: 0.4rem 0.8rem;
    border-radius: 5px;
  }
  .logout-form {
    display: inline;
  }
  .logout-button {
    display: inline-block;
    padding: 0.6rem;
    margin-left: 0.6rem;
    background-color: #1e2d5a;
    color: white;
    border: none;
    border-radius: 7px;
    transition: background-color 0.3s ease;
  }
  .logout-button:hover {
    background-color: #0055FF;
  }
  nav {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    justify-content: center;
  }
  nav a:hover {
    text-decoration: underline;
  }
  .hero {
    width: 100%;
    background: linear-gradient(rgba(0,51,160,0.6), rgba(0,51,160,0.6)), url('/img/hero_3.png') center/cover;
    color: #FFFFFF;
    text-align: center;
    padding: 120px 20px;
    animation: fadeIn 2s ease;
  }
  .hero h1 {
    font-size: 3rem;
    text-shadow: 7px 7px 8px black;
    font-weight: bold;
  }
  .btn {
    margin-top: 20px;
    padding: 15px 30px;
    background-color: #1e2d5a;
    color: #FFFFFF;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    text-transform: uppercase;
    transition: background-color 0.3s ease;
  }
  .btn:hover {
    background-color: #0055FF;
  }
  .btn-register {
    margin-top: 20px;
    padding: 15px 30px;
    background-color: #FFFFFF;
    color: #0a3360;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    text-transform: uppercase;
    transition: background-color 0.3s ease;
  }
  .btn-register:hover {
    background-color: #1e2d5a;
  }
  .btn-register_2 {
    display: block;
    max-width: 200px;
    margin: 20px auto;
    padding: 15px 30px;
    background-color: #0a3360;
    color: #FFFFFF;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    text-transform: uppercase;
    transition: background-color 0.3s ease;
  }
  .btn-register_2:hover {
    background-color: #42688f;
    color: #FFFFFF;
  }
.links-group {
    display: flex;
    flex-direction: row;
    justify-content: center;
}
@media screen and (max-width:830px) {
    .logo img {
        width: 70%;
        max-width: 300px;
        height: auto;
        margin: 0 auto;
    }
    nav {
        width: 100%;
        margin-bottom: 2rem;
    }
    nav a {
        margin: 0 0.3rem;
    }
    .hero {
        padding: 60px 20px;
    }
    .hero h1 {
        font-size: 1.5rem;
    }
    .btn-register {
        font-size: 0.8rem;
    }
}