body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    color: #333;
}

header {
    background: #1e88e5;
    color: white;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    animation: glow 2s infinite alternate;
}

header p {
    margin: 5px 0 0;
    font-size: 1.2rem;
}

#app-container {
    max-width: 900px;
    margin: 20px auto;
}

button {
    padding: 10px 20px;
    font-size: 1.2rem;
    margin: 10px;
    background: #64b5f6;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
}

button:hover {
    background: #1e88e5;
    transform: scale(1.1);
}

.hidden {
    display: none;
}

footer {
    margin-top: 20px;
    padding: 10px;
    background: #1e88e5;
    color: white;
    font-size: 1rem;
}

@keyframes glow {
    0% {
        text-shadow: 0 0 10px #1e88e5, 0 0 20px #1e88e5;
    }
    100% {
        text-shadow: 0 0 20px #64b5f6, 0 0 40px #64b5f6;
    }
}