html, body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #1f2021;
    color: white;
}

body {
    display: flex;
    justify-content: center;
}

.app-container {
    width: 100%;
    max-width: 420px;
    padding: 30px 20px 50px;
    box-sizing: border-box;
}

h1 {
    font-size: 30px;
    text-align: center;
    margin-bottom: 10px;
}

.intro {
    text-align: center;
    color: #cfcfcf;
    margin-bottom: 30px;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-top: 18px;
    margin-bottom: 7px;
    font-size: 15px;
    font-weight: bold;
}

input,
select {
    width: 100%;
    box-sizing: border-box;
    padding: 13px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    background: white;
    color: #222;
}

button {
    margin-top: 28px;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 17px;
    font-weight: bold;
    background: #6ae5e0;
    color: #111;
    cursor: pointer;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#message {
    margin-top: 20px;
    text-align: center;
    line-height: 1.4;
}