body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6f8;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 520px;
    margin: 60px auto;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 5px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 25px;
}

.card {
    background: #ffffff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
}

input {
    width: 100%;
    padding: 10px;
    margin-top: 6px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

button {
    width: 100%;
    margin-top: 20px;
    padding: 12px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    background: #0a5cff;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background: #084bcc;
}

.result {
    margin-top: 20px;
    padding: 12px;
    background: #f0f3ff;
    border-left: 4px solid #0a5cff;
    display: none;
}

footer {
    text-align: center;
    margin-top: 25px;
    font-size: 12px;
    color: #888;
}