body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #34e5f9, #3b54de);
    color: #fff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    text-align: center;
}

.header-container {
    margin-top: 120px;
}

h1 {
    font-size: 3rem;
    font-weight: bold;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 30px 0 20px;
}

.buttons button {
    padding: 10px 20px;
    font-size: 1.1rem;
    cursor: pointer;
    border-radius: 8px;
    border: none;
    background: #fff;
    color: #3b54de;
    font-weight: bold;
    transition: all 0.2s ease;
}

.buttons button:hover {
    background: #f0f0f0;
}

#demo {
    font-size: 1.2rem;
    line-height: 1.5;
    margin-bottom: 20px;
    min-height: 100px;
}

.back-link {
    margin-top: auto;
    margin-bottom: 20px;
}

.back-link a {
    color: #fff;
    opacity: 0.8;
    text-decoration: none;
    transition: 0.2s;
}

.back-link a:hover {
    opacity: 1;
}

footer {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px;
    font-size: 0.9rem;
}