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

body {
    display: flex;              
    min-height: 100vh;
    font-family: system-ui, -apple-system, BlinkMacSystemFont,
                 "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: #2c2a2c;
}


nav {
    flex: 0 0 240px;                
    background: #171517;
    border-right: 1px solid #ffffff;
    padding: 2rem 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

nav ul { list-style: none; margin: 0; padding: 0; }
nav li { margin-bottom: .6rem; }

nav a {
    display: block;                       
    padding: .6rem 1rem;
    background: transparent;              
    color: #fff;                          
    text-decoration: none;
    border-radius: 8px;
    text-align: center;
    transition: background .2s, transform .1s;
}


nav a:hover,
nav a:focus {
    background: #7306c0;                  
    transform: translateY(-1px);
}


main {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}


header { text-align: center; padding-top: 0; }
h1 { font-size: 2.2rem; margin-bottom: .5rem; }
h2 { font-size: 1.8rem; margin: 2rem 0 .5rem; }
p  { margin-bottom: 1rem; }


a {
    display: inline-block;
    color: #7b69ee;
    border-radius: 8px;
    font-weight: 600;
}


footer { text-align: center; padding: 1rem; }


.btn {
    display: inline-block;
    padding: .6rem 1.2rem;
    background: #7306c0;          
    color: #fff;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s, transform .1s;
}
.btn:hover,
.btn:focus {
    background: #5a04a0;          
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 2px solid #7306c0;
    color: #7306c0;
}
.btn-outline:hover,
.btn-outline:focus {
    background: #7306c0;
    color: #fff;
}


@media (max-width: 767px) {


    body {
        flex-direction: column;
    }


    nav {
        flex: 0 0 auto;               
        width: 100%;                  
        height: auto;                
        max-height: 60vh;           
        border-right: none;
        border-bottom: 1px solid #ffffff;
        padding: .5rem 0;
        display: flex;               
        overflow-x: auto;            
    }

 
    nav ul {
        display: flex;
        flex-wrap: nowrap;            
        list-style: none;
        margin: 0;
        padding: 0;
    }

    nav li {
        margin: 0 .4rem;             
    }

    
    nav a {
        padding: .5rem .8rem;
        white-space: nowrap;         
    }

    
    main {
        max-width: none;
        width: 100%;
        margin: 0;
        padding: 1rem .8rem;
    }

    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.5rem; }
}