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

body{
    font-family:Arial, Helvetica, sans-serif;
    background:#f5f5f5;
    color:#333;
    line-height:1.8;
}

.hero{
    position:relative;
    height:420px;
    overflow:hidden;
}

.hero img{
    width:100%;
    height:100%;
    object-fit:cover;
}

.overlay{
    position:absolute;
    inset:0;
    background:rgba(0,60,40,.60);

    display:flex;
    justify-content:center;
    align-items:center;
}

.overlay h1{
    color:white;
    font-size:56px;
    letter-spacing:2px;
}

.top-bar{
    max-width:1100px;
    margin:30px auto;
    padding:0 20px;
}

.back-btn{
    display:inline-block;
    background:#0B6E4F;
    color:white;
    text-decoration:none;
    padding:12px 25px;
    border-radius:30px;
    font-weight:bold;
    transition:.3s;
    box-shadow:0 5px 15px rgba(0,0,0,.15);
}

.back-btn:hover{
    background:#FFD700;
    color:#0B6E4F;
}

.content{
    max-width:1100px;
    margin:auto;
    padding:20px;
}

.content h2{
    color:#0B6E4F;
    margin-bottom:20px;
}

.content p{
    margin-bottom:20px;
}

.book-list{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:25px;
    margin-top:40px;
}

.book{
    background:white;
    padding:30px;
    border-radius:15px;
    box-shadow:0 8px 20px rgba(0,0,0,.08);
    transition:.3s;
}

.book:hover{
    transform:translateY(-6px);
}

.book h3{
    color:#0B6E4F;
    margin-bottom:15px;
}

footer{
    background:#0B6E4F;
    color:white;
    text-align:center;
    padding:25px;
    margin-top:60px;
}

@media(max-width:768px){

.overlay h1{
    font-size:38px;
}

.hero{
    height:280px;
}

}