body {
    min-height: 100svh;
    background:
        radial-gradient(1200px 600px at 100% -10%, rgba(111, 66, 193, 0.12), transparent 60%),
        radial-gradient(1200px 600px at -10% 110%, rgba(13, 110, 253, 0.12), transparent 60%),
        var(--bs-body-bg);
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    left: 1rem;
    z-index: 1000;
    background: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: background .3s, transform .2s;
}

.theme-toggle:hover {
    transform: rotate(10deg);
}