body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto,
        "Helvetica Neue", Arial;
    background: linear-gradient(180deg, #0f1724, #061022);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    width: min(350px, 96%);
    background: #0000005f;
    border-radius: 12px;
    padding: 18px 20px;
    box-shadow: 0 6px 20px rgba(2, 6, 23, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(13, 33, 51, 0.04);
    text-align: center;
}

h2 {
    font-size: 1.4em;
    color: #ffffff;
    font-weight: 600;
    margin-top: 0px;
}
h3 {
    font-size: 1.1em;
    color: #b8bfc39f;
    font-weight: 400;
    text-align: center;
    margin-top: 0px;
}

/* Form row */
form {
    display: flex;
    gap: 12px;
    justify-content: center;
    align-items: center;
    margin-top: 12px;
    flex-wrap: wrap;
}

/* Input styling */
input[type="number"] {
    -webkit-appearance: none;
    appearance: none;
    width: 140px;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid #e6eef6;
    background: #ffffff;
    color: #0d2133;
    font-size: 16px;
    outline: none;
    text-align: center;
    transition: box-shadow 0.14s ease, transform 0.06s ease;
}

/* Button styling */
button#botaoAdvinhar {
    padding: 10px 16px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-weight: 700;
    color: #ffffff;
    background: linear-gradient(180deg, #0b61ff, #0661d9);
    box-shadow: 0 8px 20px rgba(11, 97, 255, 0.12);
    transition: transform 0.12s ease, filter 0.12s ease;
}
button#botaoAdvinhar:hover {
    transform: translateY(-3px);
    filter: brightness(1.03);
}
button#botaoAdvinhar:active {
    transform: translateY(-1px);
}

/* Result area */
#resultado {
    margin-top: 12px;
    font-size: 15px;
    color: #b2d3e4;
    min-height: 28px;
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    background: transparent;
}

/* Responsive */
@media (max-width: 420px) {
    input[type="number"] {
        width: 110px;
        padding: 9px;
    }
    button#botaoAdvinhar {
        padding: 10px 12px;
        font-size: 14px;
    }
    .container {
        padding: 14px;
        border-radius: 10px;
    }
}