:root {
    --gray-bg: #f5f5f7;
    --white-bg: #ffffff;
    --white: #fff;
    --input-border: #ddd;
    --input-focus: #000;
    --button-bg: #676767;
    --button-hover: #323232;
    --button-text: #fff;
    --shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2em 1em;
    background-color: var(--gray-bg);
}

h1 {
    text-align: center;
    font-size: 2.2em;
    font-weight: 600;
    margin-bottom: 1.5em;
    color: #333;
}

form {
    background-color: var(--white);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1.5em;
    width: 90%;
    max-width: 32em;
    padding: 2em;
}

form label {
    display: flex;
    flex-direction: column;
    gap: 0.5em;
    font-size: 1.4em;
    color: #333;
}

form input,
form textarea {
    font-size: 0.8em;
    padding: 0.8em 1em;
    border: 1px solid var(--input-border);
    background-color: var(--white-bg);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    resize: vertical;
}

form input:focus,
form textarea:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
    outline: none;
}

form button {
    padding: 0.7em 2.2em;
    font-size: 1em;
    border: none;
    background-color: var(--button-bg);
    color: var(--button-text);
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    align-self: center;
}

form button:hover {
    background-color: var(--button-hover);
}

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

form span {
    color: red;
    align-self: center;
}

form span#ok {
    color: black;
    font-size: 1.4em;
}