body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f9fbff;
    color: #333;
}
header {
    background-color: #1a73e8;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}
header .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
}
.logo-img {
    height: 50px;
    border-radius: 8px;
}
nav a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
    font-weight: 500;
}
nav a:hover {
    text-decoration: underline;
}
.menu-toggle {
    display: none;
    cursor: pointer;
}
@media (max-width: 768px) {
    nav {
        display: none;
        width: 100%;
        flex-direction: column;
    }
    nav.active {
        display: flex;
    }
    .menu-toggle {
        display: block;
    }
}
.hero {
    text-align: center;
}
footer {
    background-color: #1a73e8;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 40px;
}
.presentation {
    max-width: 800px;
    margin: 0px auto;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.presentation h1 {
    text-align: center;
    margin-bottom: 20px;
}
.presentation ul {
    padding-left: 20px;
}
.presentation a {
    color: #0077cc;
    text-decoration: underline;
}