h1 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.8rem;
}

#subtitle {
    margin-bottom: 20px;
    color: #6b7280;
    font-size: 0.95rem;
}
body {
    font-family: Arial, sans-serif;
    background: #f4f7fb;
    color: #1f2937;
    margin: 0;
    padding: 20px;
}

#container {
    background: white;
    border: 1px solid #dbe3ec;
    border-radius: 16px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
    max-width: 700px;
    width: 100%;
    margin: 0 auto;
    padding: 24px 20px 32px 20px;
    text-align: center;
    box-sizing: border-box;
}

#btn {
    margin: 24px auto;
    min-height: 50px;
    padding: 12px 20px;
    width: 100%;
    max-width: 260px;
    font-size: 1rem;
    font-weight: bold;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease, opacity 0.2s ease;
}

#btn:hover {
    background: #1d4ed8;
}

#btn:active {
    transform: scale(0.98);
}

#output {
    margin: 20px auto 16px auto;
    font-size: 1.4rem;
    font-weight: bold;
    color: #1f2937;
    min-height: 34px;
}

#pokemonSprite {
    display: block;
    margin: 20px auto 0 auto;
    width: 180px;
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
}

@media (max-width: 700px) {
    body {
        padding: 14px;
    }

    #container {
        padding: 20px 16px 24px 16px;
        border-radius: 14px;
    }

    #btn {
        font-size: 0.95rem;
        max-width: 100%;
    }

    #output {
        font-size: 1.2rem;
    }

    #pokemonSprite {
        width: 140px;
    }
}