body {
    margin: 0;
    padding: 0;
    background: radial-gradient(circle at center, #0b1221, #010409);
    color: #e0e6ff;
    font-family: "Segoe UI", sans-serif;
    text-align: center;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.logo img {
    width: 120px;
    margin-bottom: 1rem;
    animation: pulse 3s infinite;
}

h1 {
    font-size: 2.8rem;
    margin: 0;
    color: #33aaff;
}

.tagline {
    margin: 0.5rem 0 2rem;
    font-size: 1.1rem;
    color: #9cb3d8;
}

.btn {
    background: #007aff;
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 0 10px #007aff80;
    transition: all 0.2s ease;
}
.btn:hover {
    background: #33aaff;
    box-shadow: 0 0 15px #33aaffcc;
}

footer {
    position: absolute;
    bottom: 10px;
    width: 100%;
    color: #4e5d73;
    font-size: 0.85rem;
}

@keyframes pulse {
    0%, 100% { filter: drop-shadow(0 0 5px #33aaff); }
    50% { filter: drop-shadow(0 0 15px #33aaff); }
}