body {
font-family: Inter, sans-serif;
background:#f3f4f6;
margin:0;
}

.app {
max-width:420px;
margin:auto;
padding:20px;
background:white;
min-height:100vh;
}

h1 {
font-size:32px;
font-weight:700;
}

.subtitle {
font-size:18px;
color:#555;
margin-bottom:20px;
}

label {
font-size:18px;
font-weight:600;
margin-top:16px;
display:block;
}

input {
width:100%;
padding:14px;
font-size:18px;
margin-top:6px;
border-radius:8px;
border:1px solid #ccc;
}

button {
width:100%;
padding:16px;
font-size:20px;
font-weight:600;
margin-top:20px;
background:#1d70b8;
color:white;
border:none;
border-radius:8px;
}

.result-green {
background:#e6f4ea;
color:#137333;
padding:16px;
margin-top:20px;
font-weight:700;
}

.result-red {
background:#fdecea;
color:#d93025;
padding:16px;
margin-top:20px;
font-weight:700;
}