body {
    background: #ffffff; /* plain white */
    font-family: "Times New Roman", serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.window {
    background: #f7f7f7; 
    width: 360px;
    border: 1px solid #000; /* classic thin border */
    padding: 0;
}

.title-bar {
    background: #000; /* solid black header */
    color: white;
    padding: 8px 12px;
    font-size: 18px;
    letter-spacing: 0.5px;
}

.content {
    padding: 20px;
    text-align: left;
}

.content h2 {
    font-size: 22px;
    margin: 0 0 15px 0;
    text-align: center;
    font-weight: normal;
}

label {
    font-size: 16px;
    display: block;
    margin-top: 12px;
}

input {
    width: 100%;
    padding: 6px;
    margin-top: 4px;
    font-family: "Times New Roman", serif;
    border: 1px solid #333;
    background: #fff;
    font-size: 16px;
}

button {
    width: 100%;
    padding: 7px;
    margin-top: 18px;
    background: #e6e6e6;
    border: 1px solid #000;
    font-size: 16px;
    cursor: pointer;
    font-family: "Times New Roman", serif;
}

button:hover {
    background: #dcdcdc;
}

button:active {
    background: #cfcfcf;
}

.warning {
    margin-top: 18px;
    font-size: 14px;
    color: #a1a1a1; /* soft gray */
    text-align: center;
    line-height: 1.3;
}

#error {
    color: #a00;
    text-align: center;
    margin-top: 12px;
    font-size: 15px;
}