:root {
    --gray-00: #ffffff;
    /* Lightest gray (white) */
    --gray-05: #f5f6f7;
    /* Very light gray */
    --gray-15: #d0d0d5;
    /* Light gray */
    --gray-75: #3b3b4f;
    /* Darker gray (slightly bluish tone) */
    --gray-85: #1b1b32;
    /* Darker gray */
    --gray-90: #0a0a23;
    /* Very dark gray (almost black) */
    --blue-50: #198eee;
    /* Bright blue */
    --error: #a94442;
    /* Error color (red) */
    --danger-color: #850000;
    /* Dark red for danger alerts */
    --danger-background: #ffadad;
    /* Light red for danger background */
}


*,
*::after,
*::before {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    font-family: Arial, sans-serif;
    padding: 50px 20px;
    background-color: var(--gray-85);
    color: var(--gray-05);
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    text-align: center;
}

h1 {
    font-size: xx-large;
    max-width: 300px;
    margin: 30px auto;
}

form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    width: 100%;
    max-width: 400px;
    padding: 20px;
    margin: auto 25px;
    background-color: var(--gray-75);
    border: 3px solid var(--gray-05);
    color: var(--gray-05);
}

label {
    font-weight: bold;
}

input {
    display: block;
    font-size: 3rem;
    width: 100%;
    height: 60px;
    padding: 6px;
    line-height: 1.5;
}

input:focus-visible,
button:focus-visible {
    outline: 3px solid var(--blue-50);
}

button {
    cursor: pointer;
    font-size: 1.5rem;
    width: 100%;
    padding: 10px;
    background-color: var(--blue-50);
    border: 1px solid var(--blue-50);
    color: var(--gray-05);
    transition: all 0.2s ease-in-out;
}

button:hover {
    background-color: var(--gray-05);
    color: var(--blue-50);
}

.output {
    color: white;
    background-color: var(--gray-75);
    border: 3px solid var(--gray-05);
    font-size: 3rem;
    width: 100%;
    max-width: 400px;
    min-height: 60px;
    padding: 10px;
    overflow-wrap: break-word;
}

.alert {
    font-size: 1rem;
    background-color: var(--danger-background);
    color: var(--danger-color);
    border: 3px solid var(--danger-color);
}

.hidden {
    display: none;
}