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

/* Body */
body {
    font-family: 'Poppins', sans-serif;
    height: 100vh;

    background: linear-gradient(135deg, #4facfe, #00c6ff);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Container */
.container {
    background: #e0e0e0;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    width: 350px;

    box-shadow: 0 10px 30px rgba(0,0,0,0.25);

    /* Animation */
    animation: fadeIn 1s ease-in-out;
}

/* Fade Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Heading */
h1 {
    margin-bottom: 25px;
    font-size: 30px;
    font-weight: bold;
    color: #333;
    letter-spacing: 1px;
}

/* Input */
#textBox {
    width: 90%;
    padding: 12px;
    border-radius: 10px;
    border: 1px solid #bbb;
    font-size: 18px;
    text-align: center;
    margin-bottom: 20px;

    transition: 0.3s;
}

/* Input Focus Effect */
#textBox:focus {
    border-color: #007bff;
    box-shadow: 0 0 8px rgba(0,123,255,0.5);
    outline: none;
}

/* Radio Group */
.radio-group {
    text-align: left;
    margin: 15px 0;
}

.radio-group input {
    margin-right: 8px;
    transform: scale(1.2);
    cursor: pointer;
}

.radio-group label {
    font-size: 16px;
    color: #444;
    cursor: pointer;
}

/* Button */
button {
    margin-top: 15px;
    padding: 12px 25px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    color: white;
    cursor: pointer;

    background: linear-gradient(135deg, #4facfe, #007bff);
    transition: all 0.3s ease;

    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Hover */
button:hover {
    transform: scale(1.08);
    background: linear-gradient(135deg, #007bff, #0056b3);
}

/* Click Effect */
button:active {
    transform: scale(0.95);
}

/* Result */
#result {
    margin-top: 20px;
    font-size: 22px;
    font-weight: bold;
    color: #007bff;

    animation: pop 0.5s ease;
}

/* Result Animation */
@keyframes pop {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* 🌙 Optional Dark Mode */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #1e1e2f, #121212);
    }

    .container {
        background: #2c2c3a;
        color: white;
    }

    h1 {
        color: white;
    }

    #textBox {
        background: #444;
        color: white;
        border: 1px solid #666;
    }

    .radio-group label {
        color: #ccc;
    }

    #result {
        color: #4facfe;
    }
}

/* 📱 Mobile Responsive */
@media (max-width: 400px) {
    .container {
        width: 90%;
        padding: 30px 20px;
    }

    h1 {
        font-size: 24px;
    }

    #textBox {
        font-size: 16px;
    }

    button {
        width: 100%;
    }
}