.back-home {
    display: inline-block;
    margin: 15px 20px;
    padding: 10px 15px;
    background-color: #34495e;
    color: #ecf0f1;
    text-decoration: none;
    font-weight: bold;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease, transform 0.2s ease;
}
.back-home:hover {
    background-color: #2c3e50;
    transform: translateX(-3px);
}


* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f9f9f9;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-bottom: 20px;
}




.container {
    width: 100%;
    padding: 15px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    
    
    background-color: #ecf0f1;
    padding: 15px;
    margin-bottom: 20px;
}

.content {
    display: block;
}

.sidebar {
    display: none;
}


.nav-menu a {
    text-align: center;
    padding: 10px;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
}

main {
    background-color: white;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 15px; 
}

.sidebar {
    background-color: #bdc3c7;
    padding: 20px;
    border-radius: 4px;
}




@media screen and (min-width: 768px) {
    
    
    .nav-menu {
        flex-direction: row;
        justify-content: center;
        gap: 15px; 
    }

    .nav-menu a {
        flex: 1; 
    }

    
    .content {
        display: flex;
        gap: 20px; 
    }

    main {
        flex: 2; 
        margin-bottom: 0; 
    }

    
    .sidebar {
        display: block;
        flex: 1; 
    }

}


@media screen and (min-width: 1024px) {
    
    
    .container {
        max-width: 1000px;
        margin: 0 auto; 
        padding: 30px;
        background-color: white; 
        border: 1px solid #ddd;
        border-radius: 8px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    }
    
    
    .nav-menu {
        max-width: 1000px;
        margin: 0 auto 30px auto;
        border-radius: 8px;
    }

}


.back-btn {
    position: absolute;
    top: 15px;
    left: 15px;
    width: 40px;
    height: 40px;
    background-color: #fff;
    color: #333;
    border: 1px solid #ddd;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s;
    z-index: 1000;
}
.back-btn:hover {
    transform: scale(1.1);
    background-color: #f4f4f4;
}