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

body{
    height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:#0f172a;
    font-family:
        "Segoe UI",
        "Microsoft YaHei",
        sans-serif;
}

.login-box{
    width:420px;
    background:#1e293b;
    border-radius:12px;
    padding:40px;
    box-shadow:
        0 0 30px rgba(0,0,0,0.4);
}

.logo{
    text-align:center;
    font-size:48px;
    margin-bottom:15px;
}

h1{
    color:white;
    text-align:center;
    font-size:26px;
    margin-bottom:10px;
}

.subtitle{
    text-align:center;
    color:#94a3b8;
    margin-bottom:30px;
}

input{
    width:100%;
    height:45px;
    margin-bottom:15px;
    border:none;
    border-radius:8px;
    padding-left:15px;
    background:#334155;
    color:white;
    font-size:15px;
}

input:focus{
    outline:none;
}

button{
    width:100%;
    height:45px;
    border:none;
    border-radius:8px;
    cursor:pointer;
    font-size:16px;
    background:#2563eb;
    color:white;
}

button:hover{
    opacity:0.9;
}

#msg{
    margin-top:15px;
    text-align:center;
    color:#ef4444;
}