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

body{
    font-family:Segoe UI, sans-serif;
    background:#121212;
    color:white;
}

.navbar{
    position:fixed;
    top:0;
    width:100%;
    background:#1e1e1e;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:15px 40px;
    z-index:1000;
}

.logo{
    color:#5ed35e;
    font-size:1.3rem;
    font-weight:bold;
}

.navbar ul{
    list-style:none;
}

.navbar a{
    color:white;
    text-decoration:none;
}

header{
    height:60vh;
    display:flex;
    justify-content:center;
    align-items:center;
    text-align:center;
    background:linear-gradient(135deg,#181818,#242424);
}

.header-content h1{
    font-size:3rem;
    margin-bottom:10px;
}

.btn{
    display:inline-block;
    margin-top:20px;
    background:#5ed35e;
    color:white;
    padding:12px 25px;
    border-radius:8px;
    text-decoration:none;
}

main{
    padding:80px 20px;
}

#biblioteca{
    max-width:1100px;
    margin:auto;
}

#biblioteca h2{
    text-align:center;
    color:#5ed35e;
    margin-bottom:20px;
}

.search-input{
    width:100%;
    max-width:500px;
    display:block;
    margin:0 auto 20px;
    padding:12px;
    border-radius:8px;
    border:none;
}

#contadorLivros{
    text-align:center;
    margin-bottom:20px;
}

.accordion{
    display:flex;
    flex-direction:column;
    gap:10px;
}

.accordion-btn{
    padding:15px;
    background:#1e1e1e;
    color:white;
    border:none;
    border-radius:10px;
    cursor:pointer;
    font-weight:bold;
    text-align:left;
}

.accordion-content{
    max-height:0;
    overflow:hidden;
    transition:max-height .4s ease;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
    gap:10px;
    background:#1e1e1e;
    border-radius:10px;
}

.accordion-content a{
    text-decoration:none;
    color:white;
    background:#2b2b2b;
    padding:12px;
    margin:10px;
    border-radius:8px;
    text-align:center;
}

.accordion-content a:hover{
    background:#5ed35e;
}

#btnTopo{
    position:fixed;
    bottom:20px;
    right:20px;
    border:none;
    border-radius:50%;
    width:50px;
    height:50px;
    cursor:pointer;
    background:#5ed35e;
    color:white;
    display:none;
}

.stats{
    max-width:1200px;
    margin:-50px auto 40px;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
    gap:20px;
    padding:20px;
}

.stat-card{
    background:#1e1e1e;
    padding:25px;
    border-radius:15px;
    text-align:center;
    border:1px solid #333;
}

.stat-card h3{
    color:#5ed35e;
    font-size:2rem;
}

.search-input{
    width:100%;
    max-width:700px;
    margin:20px auto;
    display:block;
    padding:15px 20px;
    border:none;
    border-radius:50px;
    font-size:1rem;
}

#resultadoPesquisa{
    text-align:center;
    margin-bottom:30px;
    color:#5ed35e;
}

.categoria{
    margin-top:40px;
    margin-bottom:15px;
    color:#5ed35e;
}

.livros-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
    gap:15px;
}

.livro-card{
    background:#1e1e1e;
    padding:20px;
    border-radius:12px;
    text-decoration:none;
    color:white;
    display:flex;
    flex-direction:column;
    gap:10px;
    transition:.3s;
    border:1px solid #333;
}

.livro-card:hover{
    transform:translateY(-5px);
    border-color:#5ed35e;
}

.livro-card span{
    font-size:2rem;
}

.categorias-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:20px;
}

.categoria-card{
    background:#1e1e1e;
    border:1px solid #333;
    border-radius:15px;
    overflow:hidden;
}

.categoria-btn{
    width:100%;
    background:none;
    border:none;
    color:white;
    cursor:pointer;
    padding:25px;
    text-align:center;
}

.categoria-btn span{
    font-size:2rem;
}

.categoria-btn h3{
    margin:10px 0;
}

.categoria-btn p{
    color:#5ed35e;
}

.categoria-conteudo{
    max-height:0;
    overflow:hidden;
    transition:max-height .4s ease;
}

.categoria-conteudo.aberta{
    max-height:5000px;
}