body{
font-family:sans-serif;
background:#f4f4f4;
margin:0;
padding:20px;
transition:0.4s;
}

.dark{
background:#111;
color:#fff;
}

.mode{
position:fixed;
top:10px;
right:10px;
padding:10px;
border:none;
border-radius:50%;
}

.titulo{text-align:center;}

.carousel{
display:flex;
align-items:center;
overflow:hidden;
}

.carousel-track{
display:flex;
overflow-x:auto;
scroll-behavior:smooth;
}

.ebook{
background:#fff;
padding:20px;
border-radius:15px;
min-width:250px;
margin:10px;
box-shadow:0 4px 15px rgba(0,0,0,0.1);
transition:0.4s;
opacity:0;
transform:translateY(40px);
animation:fade 1s forwards;
}

.dark .ebook{background:#222;}

.ebook img{
width:100%;
height:200px;
object-fit:cover;
border-radius:10px;
}

button{
background:#4CAF50;
color:white;
border:none;
padding:10px;
border-radius:8px;
cursor:pointer;
}

@keyframes fade{
to{opacity:1;transform:translateY(0);}
}

.testemunhos{
padding:60px 20px;
text-align:center;
}

.cards{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
gap:20px;
}

.card{
background:#fff;
padding:20px;
border-radius:15px;
box-shadow:0 4px 15px rgba(0,0,0,0.1);
transition:0.3s;
}

.dark .card{background:#222;}

.card:hover{
transform:scale(1.05);
}