.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
}

.theme-switch input {
    display: none;
}

.slider {
    position: relative;
    background: var(--card-bg);
    border-radius: 30px;
    width: 100%;
    height: 100%;
    box-shadow: var(--shadow);
    transition: background 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    box-sizing: border-box;
}

.slider .icon {
    font-size: 14px;
    z-index: 1;
    pointer-events: none;
    transition: opacity 0.3s ease;
    color: var(--text-sub);
}

.slider .sun {
    opacity: 1;
}

.thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    background-color: var(--thumb-color);
    border-radius: 50%;
    z-index: 2;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

input:checked + .slider .thumb {
    transform: translateX(30px);
}

input:checked + .slider .moon {
    opacity: 1;
}

input:checked + .slider {
    background: var(--promo-bg);
}