body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: #f8f9fc;
    color: #333;
    font-size: 16px;
}

* {
    box-sizing: border-box;
}

footer {
    text-align: center; 
    padding: 20px; 
    color: #666; 
    font-size: 14px; 
    border-top: 1px solid #eee; 
    margin-top: 40px;
}

.nav {
    padding: 15px;
    display: flex;
    flex-direction: row;
}

.nav .logo {
    height: 40px;
    width: auto;
}      

@media (min-width: 768px) {
    .nav {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        z-index: 10;
    } 
}

.hero {
    background: linear-gradient(90deg, #5f0fff, #7a5fff);
    color: white;
    padding: 60px 20px;
    text-align: center;
    /* border-radius: 0 0 16px 16px; */
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    position: relative;
}

.hero .title {
    font-size: 36px;
    margin: 0 0 15px 0;
}

.hero p {
    font-size: 20px;
    line-height: 1.5em;
    max-width: 32em;
    margin: 0 auto;
}

/* .page-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 60px 20px;
    max-width: 1100px;
    margin: 0 auto;
    align-items: start;
} */

.page-grid {
    padding: 15px;
    
}

@media (min-width: 768px) {
    .page-grid {
        padding: 30px;
        display: flex;
        flex-direction: row;
    }
    .page-grid > *:not(:last-child) {
        margin-right: 15px;
    }

    .ebook-preview {
        max-width: 480px
    }
}

.f-1 {
    flex: 1
}

.f-2 {
    flex: 2
}

.f-4 {
    flex: 3
}


.text-center {
    text-align: center;
}



.container {
    
    margin: 0 auto;
    padding: 15px;
    position: relative;
}

@media (min-width: 768px) {
    .container {
        max-width: 1200px;
    }
}