body {
    margin: 0;
    font-family: Arial, sans-serif;
/*    background: linear-gradient(135deg, #4facfe, #00f2fe);*/
    background: #f4f6f9;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

/* kontener */
.box {
    background: white;
    width: 90%;
    max-width: 380px;
    padding: 30px 20px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    text-align: center;
}

/* tytuł */
.box h2 {
    margin-bottom: 25px;
    font-size: 22px;
}

/* inputy */
input {
    width: 100%;
    padding: 16px;
    margin: 10px 0;
    border-radius: 10px;
    border: 1px solid #ccc;
    font-size: 16px;
    box-sizing: border-box;
}

/* focus */
input:focus {
    border-color: #4facfe;
    outline: none;
}

/* przycisk */
button {
    width: 100%;
    padding: 16px;
    margin-top: 10px;
    background: #4facfe;
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 17px;
    font-weight: bold;
    cursor: pointer;
}

/* efekt kliknięcia */
button:active {
    transform: scale(0.98);
}

/* link */
.link {
    margin-top: 18px;
    display: block;
    font-size: 14px;
    color: #4facfe;
    text-decoration: none;
}

.error {
    margin-top: 15px;
    padding: 12px;
    background: #ffe5e5;
    color: #cc0000;
    border-radius: 8px;
    font-size: 14px;
}

/* małe ekrany */
@media (max-height: 600px) {
    body {
        align-items: flex-start;
        padding-top: 20px;
    }
}