/* Reset básico */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

    body {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
        background: linear-gradient(to right, #6a11cb, #2575fc);
        color: #fff;
        text-align: center;
        padding: 20px;
    }

    h1 {
        font-size: 2.5rem;
        margin-bottom: 10px;
        text-shadow: 2px 2px 5px rgba(0,0,0,0.3);
    }

    h4 {
        font-size: 1.2rem;
        margin-bottom: 30px;
        font-weight: 400;
        color: #f0f0f0;
    }

    form {
        display: flex;
        flex-direction: column;
        gap: 15px;
        background: rgba(255, 255, 255, 0.1);
        padding: 30px;
        border-radius: 15px;
        backdrop-filter: blur(10px);
        box-shadow: 0 8px 20px rgba(0,0,0,0.2);
        width: 300px;
    }

    input[type="number"] {
        padding: 12px;
        border-radius: 8px;
        border: none;
        outline: none;
        font-size: 1rem;
        text-align: center;
    }

    input[type="submit"] {
        padding: 12px;
        border-radius: 8px;
        border: none;
        background-color: #ff6b6b;
        color: white;
        font-size: 1.1rem;
        font-weight: bold;
        cursor: pointer;
        transition: 0.3s;
    }

    input[type="submit"]:hover {
        background-color: #ff4757;
    }

    h2 {
        margin-top: 30px;
        font-size: 1.5rem;
        background: rgba(0,0,0,0.3);
        padding: 15px 25px;
        border-radius: 12px;
        display: inline-block;
    }

    b {
        color: #ffd700;
    }

    @media (max-width: 400px) {
        form {
            width: 90%;
            padding: 20px;
        }

        h1 {
            font-size: 2rem;
        }

        h2 {
            font-size: 1.2rem;
        }
    }