body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #34e5f9, #3b54de);
    color: #333;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 100px;
    text-align: center;
}

.header-container h1 {
    color: #fff;
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.header-container p {
    color: #eee;
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.ip-display {
    text-align: center;
    flex: 1;
}

#demo {
    font-size: 2rem;
    font-weight: bold;
    color: #fff;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.back-link {
    text-align: center;
    margin-bottom: 20px;
}

.back-link a {
    color: #fff;
    text-decoration: none;
    font-weight: 400;
    opacity: 0.8;
    transition: color 0.2s ease;
}

.back-link a:hover {
    color: #f8f9fa;
    opacity: 1;
}

footer {
    text-align: center;
    padding: 10px;
    background: rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: #eee;
    margin-top: auto;
}