body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: #0f172a; /* Azul marinho muito escuro */
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    color: #f1f5f9;
}

.container {
    background: #1e293b; /* Fundo do card */
    padding: 2.5em;
    border-radius: 16px;
    box-shadow: 0 10px 25px #0000004d;
    text-align: center;
    width: 90%;
    max-width: 400px;
    border: 1px solid #334155; /* Borda sutil */
}

h1 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

input {
    width: 100%;
    padding: 12px 16px;
    margin: 1em 0;
    background-color: #0f172a;
    border: 1px solid #334155;
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

input:focus {
    outline: none;
    border-color: #38bdf8; /* Azul claro ao focar */
}

button {
    width: 100%;
    padding: 12px;
    background-color: #3b82f6;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.2s ease, transform 0.1s;
}

button:hover {
    background-color: #2563eb;
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

#result {
    margin-top: 1.5em;
    padding: 1em;
    background-color: #1e293b;
    border: 1px solid #38bdf8;
    color: #38bdf8;
    border-radius: 8px;
    font-weight: 500;
}

.hidden {
    display: none;
}