/* ФОН */
body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: url('https://christinaenglish.ru/img/bg.png') center/cover;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* КАРТОЧКА */
.login-box {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    width: 280px;
}

/* ЗАГОЛОВОК */
.login-box h2 {
    margin: 0 0 15px 0;
    text-align: center;
    font-size: 20px;
}

/* ФОРМА */
form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* INPUT */
input {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: 0.2s;
}

input:focus {
    border-color: #667eea;
    outline: none;
    box-shadow: 0 0 0 2px rgba(102,126,234,0.2);
}

/* КНОПКА */
button {
    padding: 10px;
    border: none;
    border-radius: 8px;
    background: #667eea;
    color: #fff;
    font-size: 15px;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    background: #5a67d8;
}

button:active {
    transform: scale(0.98);
}

/* ОШИБКА */
.login-box div {
    text-align: center;
    font-size: 13px;
}