body{
    /* imagem de fundo com sobreposição escura para melhor leitura */
    background-image: linear-gradient(rgba(0,0,0,0.55), rgba(0,0,0,0.55)), url(imagens/Black%20and%20White%20PC%20Wallpaper%204K.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    background-color: #050505; /* fallback sólido */
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    color: #FFFFFF;
    text-align: center;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
#bloco{
    background-color: rgba(0, 0, 0, 0.32);
    width: 400px;
    padding: 20px;
    border-radius: 20px;
    max-width: calc(100% - 40px);
    box-sizing: border-box;
    border: 1px solid rgba(255,255,255,0.02);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.7);
    transition: background-color 200ms ease, box-shadow 200ms ease;
}
.login{
    font-size:32px;
    font-weight:bold;
    margin-bottom:20px;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    text-transform: uppercase;
    color:#FFFFFF;
}
label{
    display:block;
    text-align:left;
    margin-bottom:8px;
    font-size:18px;
    font-weight:bold;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    font-size: 18px;
    text-transform: uppercase;
    color:#FFFFFF;
}
input[type="text"], input[type="password"]{
    width:100%;
    padding:10px;
    margin-bottom:15px;
    border:none;
    border-radius:5px;
    font-size:16px;
    box-sizing: border-box;
}
input[type="submit"]{
    width:100%;
    padding:10px;
    background-color:#8a2be2;
    border:none;
    border-radius:5px;
    font-size:18px;
    font-weight:bold;
    color:#FFFFFF;
    cursor:pointer;
    transition: background-color 200ms ease;
    transition: 0.5s;
}
input[type="submit"]:hover{
    background-color:#6a1b99;
}
.index{
    font-size:14px;
    margin-top:15px;
    color:#FFFFFF;
}
.index a{
    color:#8a2be2;
    text-decoration:none;
    transition: color 200ms ease;
}
.index a:hover{
    color:#8a2be2;
}
.cadastro{
    font-size:14px;
    margin-top:10px;
    color:#FFFFFF;
}
.cadastro a{
    color:#8a2be2;
    text-decoration:none;
    transition: color 200ms ease;
}
.cadastro a:hover{
    color:#70d6e4;
}

/* Ajustes para celular (telas pequenas) */
@media (max-width: 480px) {
    body{
        align-items: flex-start;
        padding: 20px 10px;
        background-attachment: scroll;
        min-height: auto;
    }
    #bloco{
        width: 100%;
        max-width: 420px;
        padding: 16px;
        border-radius: 12px;
        margin: 20px auto;
        box-shadow: 0 6px 18px rgba(0,0,0,0.65);
    }
    .login{
        font-size: 22px;
        margin-bottom: 12px;
    }
    label{
        font-size: 14px;
        margin-bottom: 6px;
    }
    input[type="text"], input[type="password"]{
        padding: 12px;
        font-size: 16px;
    }
    input[type="submit"]{
        padding: 12px;
        font-size: 16px;
    }
    .index, .cadastro{
        font-size: 13px;
    }
}