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

body {
    background-color: #0c0e14;
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* card */
.card {
    background-color: #161a24;
    border: 1px solid #2a2f3d;
    border-radius: 16px;
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 380px;
    text-align: center;
}

/* header text */
.label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    color: #4f8eff;
    margin-bottom: 0.75rem;
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    color: #e8eaf0;
    line-height: 1.2;
    margin-bottom: 0.4rem;
}

.accent {
    color: #4f8eff;
}

.subtext {
    font-size: 0.82rem;
    color: #555e75;
    margin-bottom: 1.75rem;
}

/* divider between header and inputs */
.card hr {
    border: none;
    border-top: 1px solid #2a2f3d;
    margin-bottom: 1.75rem;
}

/* input */
input[type='number'] {
    width: 100%;
    background-color: #1e2330;
    border: 1px solid #2a2f3d;
    border-radius: 8px;
    color: #e8eaf0;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    padding: 0.8rem 1rem;
    outline: none;
    text-align: center;
    margin-bottom: 0.75rem;
    transition: border-color 0.25s;
}

input[type='number']::-webkit-outer-spin-button,
input[type='number']::-webkit-inner-spin-button {
    appearance: none;
}

input[type='number']::placeholder {
    color: #3a4155;
}

input[type='number']:focus {
    border-color: #4f8eff;
}

/* button */
button {
    width: 100%;
    background-color: #4f8eff;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.8rem;
    cursor: pointer;
    transition:
        background-color 0.2s,
        transform 0.1s;
    margin-bottom: 1.5rem;
}

button:hover {
    background-color: #3a72e0;
}

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

/* result */
#result {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem;
    font-weight: 500;
    min-height: 1.2rem;
    transition: color 0.25s;
}