/**
 * Header theme toggle switch
 */
.theme-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    opacity: 0;
    pointer-events: none;
}

.theme-toggle__btn {
    position: relative;
    width: 21px;
    height: 21px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--muted-color);
}

.theme-toggle__btn svg {
    width: 18px;
    height: 18px;
}

.theme-toggle__knob {
    position: absolute;
    left: 2px;
    width: 21px;
    height: 21px;
    border-radius: 999px;
    background-color: var(--border-color);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
    pointer-events: none;
}

.theme-toggle--light .theme-toggle__knob {
    transform: translateX(0);
}

.theme-toggle--dark .theme-toggle__knob {
    transform: translateX(26px);
}

/* Icon visibility logic:
 * - Light theme: left side — circle (knob), right side — night icon
 * - Dark theme: left side — bright icon, right side — circle (knob)
 */
.theme-toggle--light .theme-toggle__btn--light svg {
    opacity: 0;
    transform: scale(0.8);
}

.theme-toggle--light .theme-toggle__btn--dark svg {
    opacity: 1;
    transform: scale(1);
}

.theme-toggle--dark .theme-toggle__btn--light svg {
    opacity: 1;
    transform: scale(1);
}

.theme-toggle--dark .theme-toggle__btn--dark svg {
    opacity: 0;
    transform: scale(0.8);
}

.theme-toggle:hover .theme-toggle__knob {
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
}

.theme-toggle--ready {
    opacity: 1;
    pointer-events: auto;
}

.theme-toggle--initialized .theme-toggle__btn svg {
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.theme-toggle--initialized .theme-toggle__knob {
    transition: transform 0.25s ease, background-color 0.25s ease, box-shadow 0.25s ease;
}