* {margin:0; padding:0; box-sizing:border-box; font-family:Arial, sans-serif;}
body {background:#121212; color:#fff;}

.menu-principal {
    background:#1f1f1f;
    padding:15px 20px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    position:sticky;
    top:0;
}
.logo {color:#ff7a00; font-size:1.3em; font-weight:bold;}
.botao-instalar {
    background:#28a745;
    color:#fff;
    border:none;
    padding:8px 12px;
    border-radius:6px;
    font-size:0.9em;
    cursor:pointer;
}
.botao-menu {
    background:#ff7a00;
    color:#fff;
    border:none;
    padding:8px 12px;
    border-radius:6px;
    font-size:1em;
    cursor:pointer;
}

.menu-oculto {
    position:fixed;
    top:0;
    left:-320px;
    width:300px;
    height:100vh;
    background:#1f1f1f;
    padding:20px;
    transition:left 0.3s;
    z-index:9999;
}
.menu-oculto.aberto {left:0;}
.fechar-menu {
    background:#900;
    color:#fff;
    border:none;
    width:36px;
    height:36px;
    border-radius:50%;
    font-size:18px;
    cursor:pointer;
    float:right;
    margin-bottom:20px;
}

.lista-menu {list-style:none; clear:both; padding-top:10px;}
.lista-menu li {margin-bottom:8px;}
.lista-menu a {
    display:block;
    padding:12px;
    color:#fff;
    text-decoration:none;
    background:#2b2b2b;
    border-radius:6px;
}
.lista-menu a:hover {background:#ff7a00;}

.inicio {text-align:center; padding:40px 20px; max-width:800px; margin:0 auto;}
.inicio h1 {color:#ff7a00; margin-bottom:15px;}

.botoes {margin-top:25px;}
.btn {
    display:inline-block;
    padding:12px 24px;
    background:#ff7a00;
    color:#fff;
    border-radius:6px;
    text-decoration:none;
    font-weight:bold;
    margin:8px;
}
.btn:hover {background:#cc6200;}
.btn-2 {background:#333;}
.btn-2:hover {background:#444;}

.formulario {
    max-width:420px;
    margin:40px auto;
    background:#1e1e1e;
    padding:30px;
    border-radius:10px;
}
.formulario h2 {text-align:center; margin-bottom:20px; color:#ff7a00;}
input {
    width:100%;
    padding:12px;
    margin:8px 0;
    border:none;
    border-radius:6px;
    background:#333;
    color:#fff;
    font-size:1em;
}
.erro {
    background:#900;
    padding:10px;
    border-radius:6px;
    margin-bottom:15px;
    text-align:center;
}