body {
    background: #1d2027;
    color: #fff;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
}
.login-container {
    max-width: 350px;
    margin: 100px auto;
    padding: 32px 24px;
    background: #232630;
    border-radius: 10px;
    box-shadow: 0 2px 16px #0005;
}
h2 {
    margin-bottom: 24px;
    font-weight: 400;
    letter-spacing: 1px;
}
input {
    width: 100%;
    margin-bottom: 14px;
    padding: 10px 12px;
    border: none;
    border-radius: 5px;
    background: #181a20;
    color: #fff;
    font-size: 16px;
}
button {
    width: 100%;
    padding: 10px;
    background: #25a56a;
    color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    font-weight: 600;
    margin-bottom: 8px;
}
button:hover {
    background: #23ba7b;
}
.error {
    color: #fc5d5d;
    font-size: 14px;
    min-height: 18px;
    margin-top: 4px;
    text-align: center;
}