*{
    box-sizing:border-box;
}

body{
    margin:0;
    background:#f5f7fb;
    font-family:Arial, Helvetica, sans-serif;
    color:#1f2937;
}

.topbar{
    width:100%;
    padding:20px 30px;
}

.logo{
    max-height:60px;
    width:auto;
    display:block;
}

.container{
    min-height:calc(100vh - 100px);
    display:flex;
    align-items:center;
    justify-content:center;
    padding:30px;
}

.box{
    background:#fff;
    width:100%;
    max-width:520px;
    border-radius:14px;
    padding:40px;
    box-shadow:0 8px 30px rgba(0,0,0,.10);
}

h1{
    margin-top:0;
    margin-bottom:25px;
    text-align:center;
}

input{
    width:100%;
    padding:14px;
    margin-bottom:16px;
    border:1px solid #d1d5db;
    border-radius:8px;
    font-size:15px;
}

button{
    width:100%;
    border:0;
    background:#2563eb;
    color:#fff;
    padding:14px;
    border-radius:8px;
    font-size:15px;
    font-weight:bold;
    cursor:pointer;
}

button:hover{
    background:#1d4ed8;
}

.error{
    background:#fee2e2;
    color:#991b1b;
    padding:14px;
    border-radius:8px;
    margin-bottom:20px;
}

.success{
    background:#dcfce7;
    color:#166534;
    padding:14px;
    border-radius:8px;
    margin-bottom:20px;
}

.login-link{
    text-align:center;
    margin-top:20px;
}

.login-link a{
    color:#2563eb;
    text-decoration:none;
}

textarea{
    width:100%;
    padding:12px;
    border:1px solid #d1d5db;
    border-radius:8px;
}

table{
    width:100%;
    border-collapse:collapse;
}

table th,
table td{
    padding:10px;
    border:1px solid #ddd;
}

@media(max-width:768px){

    .topbar{
        padding:15px 20px;
    }

    .logo{
        max-height:48px;
    }

    .box{
        padding:30px 24px;
    }
}
.btn{
    display:block;
    width:100%;
    padding:14px 20px;
    margin-top:16px;
    background:#2563eb;
    color:#fff;
    text-decoration:none;
    border-radius:8px;
    font-weight:bold;
    text-align:center;
    transition:.2s;
}

.btn:hover{
    background:#1d4ed8;
}

.btn-secondary{
    background:#374151;
}

.btn-secondary:hover{
    background:#1f2937;
}