body {
    margin: 0;
    font-family: Arial, sans-serif;
    display: grid;
    grid-template-rows: auto 1fr auto;
    grid-template-columns: 250px 1fr;
    grid-template-areas:
        "header header"
        "sidebar main"
        "footer footer";
    height: 100vh;
    background-color: #f4f4f4;
}


.header {
    grid-area: header;
    background-color: #171718;
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header .logo h1 {
    margin: 0;
    font-size: 1.8rem;
}

.top-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.top-nav ul li a {
    text-decoration: none;
    color: white;
    font-weight: bold;
    transition: color 0.3s;
}

.top-nav ul li a:hover {
    color: #ffcc00;
}


.sidebar {
    grid-area: sidebar;
    background-color: #eeeeee;
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar ul {
    list-style-type: none;
    padding: 0;
}

.sidebar ul li {
    margin: 15px 0;
}

.sidebar ul li a {
    text-decoration: none;
    color: #000;
    padding: 10px;
    display: block;
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

.sidebar ul li a.active {
    background-color: #171718;
    color: white;
}

.sidebar ul li a:hover {
    background-color: #d3d3d3;
    color: #171718;
}

.main-content {
    grid-area: main;
    padding: 20px;
    background-color: #ffffff;
    overflow-y: auto;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}


.hero {
    text-align: center;
    background-color: #e3f2fd;
    padding: 50px;
    margin-bottom: 30px;
    border-radius: 10px;
}

.hero h2 {
    margin: 0 0 15px;
    font-size: 2.5rem;
    color: #171718;
}

.hero p {
    margin: 0 0 25px;
    color: #555;
    font-size: 1.2rem;
}

.cta-button {
    background-color: #0d47a1;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #08306b;
}


.features {
    margin-top: 20px;
}

.features h3 {
    font-size: 2rem;
    color: #171718;
    margin-bottom: 20px;
}

.feature-item {
    background-color: #ffffff;
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.feature-item h4 {
    font-size: 1.5rem;
    color: #171718;
    margin-bottom: 10px;
}

.feature-item p {
    color: #555;
    font-size: 1rem;
}


.footer {
    grid-area: footer;
    background-color: #171718;
    color: white;
    text-align: center;
    padding: 20px;
}

.footer nav a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
    font-weight: bold;
    transition: color 0.3s;
}

.footer nav a:hover {
    color: #ffcc00;
}


@media (max-width: 768px) {
    body {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "main"
            "sidebar"
            "footer";
    }

    .sidebar {
        grid-area: sidebar;
        padding: 10px;
    }

    .top-nav ul {
        flex-direction: column;
        gap: 10px;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .cta-button {
        font-size: 1rem;
        padding: 10px 20px;
    }
}

@media (max-width: 480px) {
    .header {
        flex-direction: column;
        text-align: center;
    }

    .top-nav ul {
        flex-direction: column;
        gap: 5px;
    }

    .sidebar {
        display: none; 
    }

    .hero {
        padding: 30px;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .cta-button {
        font-size: 0.9rem;
        padding: 8px 16px;
    }

    .features h3 {
        font-size: 1.5rem;
    }

    .feature-item {
        padding: 15px;
    }

    .footer {
        font-size: 0.9rem;
    }
}