body {
    background: linear-gradient(135deg, #1f3c88, #39a2db);
    background-attachment: fixed;
    font-family: 'Segoe UI', sans-serif;
    transition: background 0.4s ease;
}

body[data-bs-theme="dark"] {
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
}

.card {
    border-radius: 18px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.25);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    border-radius: 50px;
}