.theme-toggle {
    position: relative;
    width: 60px;
    height: 32px;
    border-radius: 16px;
    border: 1px solid var(--toggle-border);
    background: var(--toggle-bg);
    cursor: pointer;
    transition:
        background var(--ui-motion-duration, 250ms) var(--ui-motion-ease, cubic-bezier(0.4, 0, 0.2, 1)),
        border-color var(--ui-motion-duration, 250ms) var(--ui-motion-ease, cubic-bezier(0.4, 0, 0.2, 1));
    flex-shrink: 0;
    padding: 0;
}

.theme-toggle__thumb {
    position: absolute;
    top: 3px;
    right: 3px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary, var(--primary)));
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
    transition: transform var(--ui-motion-duration, 250ms) var(--ui-motion-ease, cubic-bezier(0.4, 0, 0.2, 1));
    will-change: transform;
}

.theme-toggle__thumb::before {
    content: '\f185';
    font-family: 'Line Awesome Free';
    font-weight: 900;
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.85rem;
}

[data-theme="light"] .theme-toggle__thumb {
    transform: translateX(-28px);
}

[data-theme="light"] .theme-toggle__thumb::before {
    content: '\f186';
}

.theme-toggle[data-theme-state="light"] .theme-toggle__thumb {
    transform: translateX(-28px);
}

.theme-toggle[data-theme-state="light"] .theme-toggle__thumb::before {
    content: '\f186';
}

.theme-toggle[data-theme-state="dark"] .theme-toggle__thumb {
    transform: translateX(0);
}

.theme-toggle[data-theme-state="dark"] .theme-toggle__thumb::before {
    content: '\f185';
}

.theme-toggle:hover {
    border-color: rgba(99, 102, 241, 0.35);
}

.theme-toggle:focus-visible {
    outline: 3px solid rgba(99, 102, 241, 0.35);
    outline-offset: 3px;
}

.theme-toggle__icon {
    display: none;
}

@media (prefers-reduced-motion: reduce) {
    .theme-toggle,
    .theme-toggle__thumb {
        transition: none;
    }
}

@media (max-width: 640px) {
    .theme-toggle {
        width: 52px;
        height: 28px;
        border-radius: 14px;
    }

    .theme-toggle__thumb {
        width: 22px;
        height: 22px;
        top: 2px;
        right: 2px;
    }

    [data-theme="light"] .theme-toggle__thumb,
    .theme-toggle[data-theme-state="light"] .theme-toggle__thumb {
        transform: translateX(-22px);
    }

    .theme-toggle__thumb::before {
        font-size: 0.75rem;
    }
}

@media (max-width: 420px) {
    .theme-toggle {
        width: 46px;
        height: 26px;
        border-radius: 13px;
    }

    .theme-toggle__thumb {
        width: 20px;
        height: 20px;
        top: 2px;
        right: 2px;
    }

    [data-theme="light"] .theme-toggle__thumb,
    .theme-toggle[data-theme-state="light"] .theme-toggle__thumb {
        transform: translateX(-18px);
    }

    .theme-toggle__thumb::before {
        font-size: 0.7rem;
    }
}