form {
    display: flex;
    flex-direction: column;
    padding: 20px;
    width: 480px;
    background-color: rgba(9, 137, 212, 0.647);
    border-radius: 15px;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

form input {
    background-size: auto 80%;
    background-repeat: no-repeat;
    background-position: 99% center;
    padding: 5px;
    margin: 10px;
    padding-left: 15px;
}

input:focus {
    background-color: rgba(255, 255, 255, 0.8);
}

input:required:placeholder-shown {
    background-image: url("../img/hvezda.png");
}

input:invalid:not(:placeholder-shown):not([type=date]) {
    background-image: url("../img/chyba.png");
}

input:valid:not(:placeholder-shown):not([type=date]):not([type=submit]) {
    background-image: url("../img/dobre.png");
}

input[type=submit] {
    background-color: rgb(1, 169, 1);
    border: 0;
    color: white;
}

.container {
    background: white;
    color: black;
    padding: 2rem 3rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.center {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
}

h1 {
    color: #2b7a78;
    text-align: center;
}

.udaj {
    margin: 1rem 0;
}

.udaj span {
    font-weight: bold;
    color: #17252a;
}

.zpet {
    display: block;
    text-align: center;
    margin-top: 2rem;
    text-decoration: none;
    color: white;
    background: #3aafa9;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    transition: background 0.3s ease;
}

.zpet:hover {
    background: #2b7a78;
}