/* Theme Toggle Component Styles */

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Accessibility enhancements */
.theme-toggle[role="switch"],
.mobile-header-theme-btn[role="switch"],
.mobile-theme-toggle[role="switch"] {
    /* Ensure proper focus management */
    outline: none;
}

.theme-toggle[role="switch"]:focus,
.mobile-header-theme-btn[role="switch"]:focus,
.mobile-theme-toggle[role="switch"]:focus {
    outline: 2px solid var(--theme-focus-ring, rgba(59, 130, 246, 0.5));
    outline-offset: 2px;
}

/* High contrast mode support for accessibility */
@media (prefers-contrast: high) {
    .theme-toggle[role="switch"]:focus,
    .mobile-header-theme-btn[role="switch"]:focus,
    .mobile-theme-toggle[role="switch"]:focus {
        outline: 3px solid currentColor;
        outline-offset: 3px;
    }
}

/* JavaScript-controlled reduced motion support */
.prefers-reduced-motion .theme-toggle-track,
.prefers-reduced-motion .theme-toggle-thumb,
.prefers-reduced-motion .theme-icon,
.prefers-reduced-motion .mobile-theme-toggle,
.prefers-reduced-motion .mobile-theme-toggle-track,
.prefers-reduced-motion .mobile-theme-toggle-thumb,
.prefers-reduced-motion .mobile-header-theme-btn,
.prefers-reduced-motion .mobile-header-theme-btn .theme-icon {
    transition: none !important;
    animation: none !important;
}

/* Enhanced focus indicators for reduced motion users */
.prefers-reduced-motion .theme-toggle:focus,
.prefers-reduced-motion .mobile-theme-toggle:focus,
.prefers-reduced-motion .mobile-header-theme-btn:focus {
    outline: 3px solid var(--theme-focus-ring, rgba(59, 130, 246, 0.8)) !important;
    outline-offset: 3px !important;
    background-color: var(--theme-focus-bg, rgba(59, 130, 246, 0.1)) !important;
}

/* Alternative visual feedback for reduced motion users */
.prefers-reduced-motion [data-reduced-motion="true"].success {
    background-color: var(--theme-success-bg, rgba(34, 197, 94, 0.2)) !important;
    border-color: var(--theme-success-border, rgba(34, 197, 94, 0.5)) !important;
}

.prefers-reduced-motion [data-reduced-motion="true"].error {
    background-color: var(--theme-error-bg, rgba(239, 68, 68, 0.2)) !important;
    border-color: var(--theme-error-border, rgba(239, 68, 68, 0.5)) !important;
}

/* Desktop Theme Toggle */
.theme-toggle-wrapper {
    display: flex;
    align-items: center;
    margin-right: 1rem;
    /* Performance optimization: contain layout and style changes */
    contain: layout style;
}

.theme-toggle {
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    outline: none;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 26px;
    -webkit-tap-highlight-color: transparent;
    /* Performance optimizations */
    contain: layout style;
    will-change: transform;
    /* Use transform instead of other properties for better performance */
    transform: translateZ(0); /* Force hardware acceleration */
}

.theme-toggle:focus {
    outline: 2px solid var(--theme-focus-ring, rgba(59, 130, 246, 0.5));
    outline-offset: 2px;
}

.theme-toggle-track {
    width: 52px;
    height: 28px;
    background: var(--theme-toggle-track-bg, rgba(0, 0, 0, 0.1));
    border-radius: 14px;
    position: relative;
    /* Optimize transitions for performance */
    transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--theme-toggle-border, rgba(0, 0, 0, 0.1));
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    /* Performance optimizations */
    contain: layout style;
    will-change: background-color, border-color;
    /* Use transform3d to enable hardware acceleration */
    transform: translate3d(0, 0, 0);
}

.theme-toggle-thumb {
    width: 24px;
    height: 24px;
    background: var(--theme-toggle-thumb-bg, #ffffff);
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    /* Optimize transitions - use transform for better performance */
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--theme-toggle-thumb-border, rgba(0, 0, 0, 0.05));
    /* Performance optimizations */
    contain: layout style;
    will-change: transform, background-color, border-color;
    /* Enable hardware acceleration */
    transform: translate3d(0, 0, 0);
}

/* Theme Icons */
.theme-icon {
    position: absolute;
    /* Optimize icon transitions for performance */
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--theme-icon-color, #64748b);
    /* Performance optimizations */
    contain: layout style;
    will-change: opacity, transform, color;
    /* Enable hardware acceleration */
    transform: translate3d(0, 0, 0);
}

.theme-icon-sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.theme-icon-moon {
    opacity: 0;
    transform: rotate(180deg) scale(0.5);
}

/* Dark theme state */
[data-theme="dark"] .theme-toggle-track {
    background: var(--theme-toggle-track-bg-dark, rgba(59, 130, 246, 0.2));
    border-color: var(--theme-toggle-border-dark, rgba(59, 130, 246, 0.3));
}

[data-theme="dark"] .theme-toggle-thumb {
    /* Use translate3d for hardware acceleration */
    transform: translate3d(24px, 0, 0);
    background: var(--theme-toggle-thumb-bg-dark, #1e293b);
    border-color: var(--theme-toggle-thumb-border-dark, rgba(59, 130, 246, 0.2));
}

[data-theme="dark"] .theme-icon-sun {
    opacity: 0;
    transform: rotate(-180deg) scale(0.5);
}

[data-theme="dark"] .theme-icon-moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: var(--theme-icon-color-dark, #60a5fa);
}

/* Hover effects for desktop - optimized for performance */
@media (hover: hover) and (pointer: fine) {
    .theme-toggle:hover .theme-toggle-track {
        background: var(--theme-toggle-track-hover, rgba(0, 0, 0, 0.15));
        box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15), 0 0 0 4px rgba(59, 130, 246, 0.1);
    }
    
    .theme-toggle:hover .theme-toggle-thumb {
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        /* Use transform3d for hardware acceleration */
        transform: translate3d(0, 0, 0) scale(1.05);
    }
    
    [data-theme="dark"] .theme-toggle:hover .theme-toggle-track {
        background: var(--theme-toggle-track-hover-dark, rgba(59, 130, 246, 0.3));
    }
    
    [data-theme="dark"] .theme-toggle:hover .theme-toggle-thumb {
        /* Use transform3d for hardware acceleration */
        transform: translate3d(24px, 0, 0) scale(1.05);
    }
}

/* Active state - optimized for performance */
.theme-toggle:active .theme-toggle-thumb {
    /* Use transform3d for hardware acceleration */
    transform: translate3d(0, 0, 0) scale(0.95);
}

[data-theme="dark"] .theme-toggle:active .theme-toggle-thumb {
    /* Use transform3d for hardware acceleration */
    transform: translate3d(24px, 0, 0) scale(0.95);
}

/* Mobile Settings Section */
.mobile-settings-section {
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--theme-mobile-section-bg, rgba(0, 123, 255, 0.02));
    border-radius: 12px;
    border: 1px solid var(--theme-mobile-section-border, rgba(0, 123, 255, 0.1));
    /* Optimize for mobile scrolling */
    -webkit-overflow-scrolling: touch;
    /* Prevent zoom on double tap */
    touch-action: manipulation;
}

.mobile-settings-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--theme-border-muted);
    font-size: 1rem;
    font-weight: 600;
    color: var(--theme-text-primary);
}

.mobile-settings-header svg {
    color: var(--theme-brand-primary);
    flex-shrink: 0;
}

.mobile-setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
}

.mobile-setting-info {
    flex: 1;
    min-width: 0;
}

.mobile-setting-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--theme-text-primary);
    margin-bottom: 0.25rem;
}

.mobile-setting-description {
    font-size: 0.8rem;
    color: var(--theme-text-secondary);
    opacity: 0.8;
}

/* Legacy mobile theme section styles for backward compatibility */
.mobile-theme-section {
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--theme-mobile-section-bg, rgba(0, 123, 255, 0.02));
    border-radius: 12px;
    border: 1px solid var(--theme-mobile-section-border, rgba(0, 123, 255, 0.1));
    /* Optimize for mobile scrolling */
    -webkit-overflow-scrolling: touch;
    /* Prevent zoom on double tap */
    touch-action: manipulation;
}

.mobile-theme-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--theme-mobile-label-color, var(--gray-700));
    margin-bottom: 1rem;
    text-align: center;
    opacity: 0.8;
}

.mobile-theme-toggle-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.mobile-theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--theme-mobile-toggle-bg, transparent);
    border: none;
    border-radius: 12px;
    padding: 0.5rem;
    cursor: pointer;
    /* Optimize transitions for mobile performance */
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
    min-height: 44px; /* Minimum touch target size */
    min-width: 44px; /* Ensure square touch target minimum */
    -webkit-tap-highlight-color: transparent;
    /* Mobile optimizations */
    touch-action: manipulation;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    /* Improve touch responsiveness */
    -webkit-touch-callout: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    flex-shrink: 0;
    /* Performance optimizations */
    contain: layout style;
    will-change: transform, background-color, border-color;
    /* Enable hardware acceleration */
    transform: translate3d(0, 0, 0);
}

/* Legacy full-width mobile theme toggle for backward compatibility */
.mobile-theme-toggle-wrapper .mobile-theme-toggle {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--theme-mobile-toggle-bg, white);
    border: 2px solid var(--theme-mobile-toggle-border, rgba(0, 123, 255, 0.2));
    border-radius: 16px;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--theme-mobile-toggle-color, var(--gray-700));
    width: 100%;
    justify-content: center;
}

.mobile-theme-toggle:focus {
    outline: 2px solid var(--theme-focus-ring, rgba(59, 130, 246, 0.5));
    outline-offset: 2px;
}

.mobile-theme-toggle-track {
    width: 48px;
    height: 26px;
    background: var(--theme-mobile-track-bg, rgba(0, 0, 0, 0.1));
    border-radius: 13px;
    position: relative;
    /* Optimize transitions for mobile performance */
    transition: background-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--theme-mobile-track-border, rgba(0, 0, 0, 0.1));
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
    /* Performance optimizations */
    contain: layout style;
    will-change: background-color, border-color;
    /* Enable hardware acceleration */
    transform: translate3d(0, 0, 0);
}

.mobile-theme-toggle-thumb {
    width: 22px;
    height: 22px;
    background: var(--theme-mobile-thumb-bg, #ffffff);
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    /* Optimize transitions for mobile performance */
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--theme-mobile-thumb-border, rgba(0, 0, 0, 0.05));
    /* Performance optimizations */
    contain: layout style;
    will-change: transform, background-color, border-color;
    /* Enable hardware acceleration */
    transform: translate3d(0, 0, 0);
}

/* Legacy larger track for full-width toggle */
.mobile-theme-toggle-wrapper .mobile-theme-toggle-track {
    width: 60px;
    height: 32px;
    border-radius: 16px;
}

.mobile-theme-toggle-wrapper .mobile-theme-toggle-thumb {
    width: 28px;
    height: 28px;
}

.mobile-theme-label-text {
    font-weight: 600;
    transition: color 0.2s ease;
}

/* Mobile dark theme state */
[data-theme="dark"] .mobile-theme-section {
    background: var(--theme-mobile-section-bg-dark, rgba(59, 130, 246, 0.1));
    border-color: var(--theme-mobile-section-border-dark, rgba(59, 130, 246, 0.2));
}

[data-theme="dark"] .mobile-theme-toggle {
    background: var(--theme-mobile-toggle-bg-dark, #1e293b);
    border-color: var(--theme-mobile-toggle-border-dark, rgba(59, 130, 246, 0.3));
    color: var(--theme-mobile-toggle-color-dark, #e2e8f0);
}

[data-theme="dark"] .mobile-theme-toggle-track {
    background: var(--theme-mobile-track-bg-dark, rgba(59, 130, 246, 0.2));
    border-color: var(--theme-mobile-track-border-dark, rgba(59, 130, 246, 0.3));
}

[data-theme="dark"] .mobile-theme-toggle-thumb {
    /* Use translate3d for hardware acceleration */
    transform: translate3d(22px, 0, 0);
    background: var(--theme-mobile-thumb-bg-dark, #334155);
    border-color: var(--theme-mobile-thumb-border-dark, rgba(59, 130, 246, 0.2));
}

/* Legacy larger thumb translation for full-width toggle */
[data-theme="dark"] .mobile-theme-toggle-wrapper .mobile-theme-toggle-thumb {
    transform: translateX(28px);
}

/* Mobile hover effects - only for devices that support hover */
@media (hover: hover) and (pointer: fine) {
    .mobile-theme-toggle:hover {
        background: var(--theme-mobile-toggle-hover, rgba(0, 123, 255, 0.05));
        border-color: var(--theme-mobile-toggle-border-hover, rgba(0, 123, 255, 0.3));
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(0, 123, 255, 0.15);
    }
    
    [data-theme="dark"] .mobile-theme-toggle:hover {
        background: var(--theme-mobile-toggle-hover-dark, #334155);
        border-color: var(--theme-mobile-toggle-border-hover-dark, rgba(59, 130, 246, 0.4));
    }
}

/* Touch-specific feedback for mobile devices */
@media (hover: none) or (pointer: coarse) {
    .mobile-theme-toggle:active {
        background: var(--theme-mobile-toggle-active, rgba(0, 123, 255, 0.1));
        border-color: var(--theme-mobile-toggle-border-active, rgba(0, 123, 255, 0.4));
        transform: scale(0.98);
        transition-duration: 0.1s;
    }
    
    [data-theme="dark"] .mobile-theme-toggle:active {
        background: var(--theme-mobile-toggle-active-dark, #475569);
        border-color: var(--theme-mobile-toggle-border-active-dark, rgba(59, 130, 246, 0.5));
    }
    
    /* Enhanced visual feedback for touch */
    .mobile-theme-toggle:active .mobile-theme-toggle-track {
        box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2);
    }
    
    .mobile-theme-toggle:active .mobile-theme-toggle-thumb {
        /* Use transform3d for hardware acceleration */
        transform: translate3d(0, 0, 0) scale(0.95);
    }
    
    [data-theme="dark"] .mobile-theme-toggle:active .mobile-theme-toggle-thumb {
        /* Use transform3d for hardware acceleration */
        transform: translate3d(22px, 0, 0) scale(0.95);
    }
}

/* Touch device optimizations */
@media (hover: none) or (pointer: coarse) {
    /* Ensure minimum touch target size (44px) */
    .theme-toggle {
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 6px;
    }
    
    .mobile-theme-toggle {
        min-width: 44px;
        min-height: 44px;
        padding: 1rem 1.5rem;
    }
    
    /* Optimized touch feedback */
    .theme-toggle:active,
    .mobile-theme-toggle:active {
        transform: scale(0.95);
        transition-duration: 0.1s;
    }
    
    /* Faster animations for mobile performance */
    .theme-toggle-track,
    .theme-toggle-thumb,
    .mobile-theme-toggle-track,
    .mobile-theme-toggle-thumb {
        transition-duration: 0.2s;
        transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    /* Enhanced visual feedback for touch */
    .theme-toggle:active .theme-toggle-track,
    .mobile-theme-toggle:active .mobile-theme-toggle-track {
        box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2);
    }
    
    /* Prevent text selection on touch */
    .theme-toggle,
    .mobile-theme-toggle,
    .mobile-theme-label-text {
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        -webkit-touch-callout: none;
    }
}

/* Reduced motion support - comprehensive accessibility implementation */
@media (prefers-reduced-motion: reduce) {
    /* Disable all animations and transitions for users with motion sensitivity */
    .theme-toggle-track,
    .theme-toggle-thumb,
    .theme-icon,
    .mobile-theme-toggle,
    .mobile-theme-toggle-track,
    .mobile-theme-toggle-thumb,
    .mobile-header-theme-btn,
    .mobile-header-theme-btn .theme-icon {
        transition: none !important;
        animation: none !important;
    }
    
    /* Remove hover transforms that could cause motion */
    .theme-toggle:hover .theme-toggle-thumb,
    .mobile-theme-toggle:hover,
    .mobile-header-theme-btn:hover {
        transform: none !important;
    }
    
    /* Ensure theme state changes are still visible without motion */
    [data-theme="dark"] .theme-toggle-thumb {
        /* Instant position change without animation */
        transform: translate3d(24px, 0, 0) !important;
        transition: none !important;
    }
    
    [data-theme="dark"] .mobile-theme-toggle-thumb {
        /* Instant position change without animation */
        transform: translate3d(22px, 0, 0) !important;
        transition: none !important;
    }
    
    /* Icon changes should be instant */
    .theme-icon-sun,
    .theme-icon-moon {
        transition: none !important;
    }
    
    [data-theme="dark"] .theme-icon-sun {
        opacity: 0 !important;
        transform: none !important;
    }
    
    [data-theme="dark"] .theme-icon-moon {
        opacity: 1 !important;
        transform: none !important;
    }
    
    /* Remove loading and success animations */
    .theme-toggle.loading .theme-toggle-thumb,
    .mobile-theme-toggle.loading .mobile-theme-toggle-thumb {
        animation: none !important;
    }
    
    .theme-toggle.success .theme-toggle-thumb,
    .mobile-theme-toggle.success .mobile-theme-toggle-thumb {
        animation: none !important;
    }
    
    /* Provide alternative visual feedback without motion */
    .theme-toggle:focus,
    .mobile-theme-toggle:focus,
    .mobile-header-theme-btn:focus {
        /* Enhanced focus ring for reduced motion users */
        outline: 3px solid var(--theme-focus-ring, rgba(59, 130, 246, 0.8)) !important;
        outline-offset: 3px !important;
    }
    
    /* Alternative feedback for theme changes without animation */
    .theme-toggle.success,
    .mobile-theme-toggle.success {
        /* Brief color change instead of animation */
        background-color: var(--theme-success-bg, rgba(34, 197, 94, 0.1)) !important;
    }
    
    .theme-toggle.error,
    .mobile-theme-toggle.error {
        /* Brief color change instead of animation */
        background-color: var(--theme-error-bg, rgba(239, 68, 68, 0.1)) !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .theme-toggle-track,
    .mobile-theme-toggle-track {
        border-width: 2px;
        border-color: currentColor;
    }
    
    .theme-toggle-thumb,
    .mobile-theme-toggle-thumb {
        border-width: 2px;
        border-color: currentColor;
    }
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .theme-toggle-wrapper {
        display: none; /* Hide desktop toggle on mobile */
    }
    
    /* Mobile-specific optimizations */
    .mobile-settings-section,
    .mobile-theme-section {
        margin: 1.5rem 0;
        padding: 1rem;
    }
    
    .mobile-setting-item {
        padding: 0.75rem 0;
    }
    
    .mobile-setting-title {
        font-size: 0.9rem;
    }
    
    .mobile-setting-description {
        font-size: 0.75rem;
    }
    
    /* Legacy full-width toggle adjustments */
    .mobile-theme-toggle-wrapper .mobile-theme-toggle {
        padding: 0.875rem 1.25rem;
        font-size: 0.95rem;
        gap: 0.875rem;
    }
    
    .mobile-theme-toggle-wrapper .mobile-theme-toggle-track {
        width: 56px;
        height: 30px;
    }
    
    .mobile-theme-toggle-wrapper .mobile-theme-toggle-thumb {
        width: 26px;
        height: 26px;
    }
    
    [data-theme="dark"] .mobile-theme-toggle-wrapper .mobile-theme-toggle-thumb {
        transform: translateX(26px);
    }
    
    [data-theme="dark"] .mobile-theme-toggle-wrapper .mobile-theme-toggle:active .mobile-theme-toggle-thumb {
        transform: translateX(26px) scale(0.95);
    }
}

@media (min-width: 901px) {
    .mobile-theme-section {
        display: none; /* Hide mobile toggle on desktop */
    }
}

/* Landscape mobile optimizations */
@media (max-width: 900px) and (orientation: landscape) {
    .mobile-theme-section {
        margin: 1rem 0;
        padding: 0.75rem 1rem;
    }
    
    .mobile-theme-label {
        font-size: 0.8rem;
        margin-bottom: 0.75rem;
    }
    
    .mobile-theme-toggle {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        min-height: 40px;
    }
}

/* Mobile Header Theme Toggle - Compact Version */
.mobile-header-theme-toggle {
    display: none;
}

@media (max-width: 900px) {
    .mobile-header-theme-toggle {
        display: flex;
        align-items: center;
        margin-right: 0.75rem;
    }
    
    .mobile-header-theme-btn {
        position: relative;
        background: var(--theme-bg-elevated);
        border: 1px solid var(--theme-border-primary);
        border-radius: 10px;
        cursor: pointer;
        padding: 0.625rem;
        /* Optimize transitions for mobile performance */
        transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
                    background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
                    border-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        backdrop-filter: blur(10px);
        outline: none;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        /* Performance optimizations */
        contain: layout style;
        will-change: transform, background-color, border-color;
        /* Enable hardware acceleration */
        transform: translate3d(0, 0, 0);
    }
    
    .mobile-header-theme-btn:focus {
        outline: 2px solid var(--theme-focus-ring, rgba(59, 130, 246, 0.5));
        outline-offset: 2px;
    }
    
    .mobile-header-theme-btn .theme-icon {
        position: absolute;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        color: var(--theme-text-secondary);
    }
    
    .mobile-header-theme-btn .theme-icon-sun {
        opacity: 1;
        transform: rotate(0deg) scale(1);
    }
    
    .mobile-header-theme-btn .theme-icon-moon {
        opacity: 0;
        transform: rotate(180deg) scale(0.5);
    }
    
    /* Dark theme state for mobile header toggle */
    [data-theme="dark"] .mobile-header-theme-btn {
        background: var(--theme-bg-elevated);
        border-color: var(--theme-border-focus);
    }
    
    [data-theme="dark"] .mobile-header-theme-btn .theme-icon-sun {
        opacity: 0;
        transform: rotate(-180deg) scale(0.5);
    }
    
    [data-theme="dark"] .mobile-header-theme-btn .theme-icon-moon {
        opacity: 1;
        transform: rotate(0deg) scale(1);
        color: var(--theme-brand-primary);
    }
    
    /* Touch feedback for mobile header toggle */
    .mobile-header-theme-btn:active {
        background: var(--theme-hover-bg);
        border-color: var(--theme-border-focus);
        transform: scale(0.95);
        transition-duration: 0.1s;
    }
    
    [data-theme="dark"] .mobile-header-theme-btn:active {
        background: var(--theme-selected-bg);
        border-color: var(--theme-brand-primary);
    }
}

/* Small mobile devices */
@media (max-width: 480px) {
    .mobile-settings-section,
    .mobile-theme-section {
        margin: 1rem 0;
        padding: 0.875rem;
        border-radius: 10px;
    }
    
    .mobile-settings-header {
        font-size: 0.9rem;
        margin-bottom: 1rem;
        padding-bottom: 0.75rem;
    }
    
    .mobile-setting-item {
        padding: 0.625rem 0;
    }
    
    .mobile-setting-title {
        font-size: 0.85rem;
    }
    
    .mobile-setting-description {
        font-size: 0.7rem;
    }
    
    .mobile-theme-toggle-track {
        width: 44px;
        height: 24px;
        border-radius: 12px;
    }
    
    .mobile-theme-toggle-thumb {
        width: 20px;
        height: 20px;
    }
    
    [data-theme="dark"] .mobile-theme-toggle-thumb {
        transform: translateX(20px);
    }
    
    [data-theme="dark"] .mobile-theme-toggle:active .mobile-theme-toggle-thumb {
        transform: translateX(20px) scale(0.95);
    }
    
    /* Legacy full-width toggle for small screens */
    .mobile-theme-toggle-wrapper .mobile-theme-toggle {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        gap: 0.75rem;
        border-radius: 12px;
    }
    
    .mobile-theme-label {
        font-size: 0.8rem;
        margin-bottom: 0.75rem;
    }
    
    .mobile-theme-toggle-wrapper .mobile-theme-toggle-track {
        width: 52px;
        height: 28px;
    }
    
    .mobile-theme-toggle-wrapper .mobile-theme-toggle-thumb {
        width: 24px;
        height: 24px;
    }
    
    [data-theme="dark"] .mobile-theme-toggle-wrapper .mobile-theme-toggle-thumb {
        transform: translateX(24px);
    }
    
    [data-theme="dark"] .mobile-theme-toggle-wrapper .mobile-theme-toggle:active .mobile-theme-toggle-thumb {
        transform: translateX(24px) scale(0.95);
    }
    
    /* Compact mobile header toggle for small screens */
    .mobile-header-theme-btn {
        padding: 0.5rem;
        min-width: 40px;
        min-height: 40px;
    }
}

/* Loading state */
.theme-toggle.loading,
.mobile-theme-toggle.loading {
    pointer-events: none;
    opacity: 0.7;
}

.theme-toggle.loading .theme-toggle-thumb,
.mobile-theme-toggle.loading .mobile-theme-toggle-thumb {
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Error state */
.theme-toggle.error .theme-toggle-track,
.mobile-theme-toggle.error .mobile-theme-toggle-track {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

/* Success animation */
.theme-toggle.success .theme-toggle-thumb,
.mobile-theme-toggle.success .mobile-theme-toggle-thumb {
    animation: success-bounce 0.4s ease-out;
}

@keyframes success-bounce {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

[data-theme="dark"] .theme-toggle.success .theme-toggle-thumb {
    animation: success-bounce-dark 0.4s ease-out;
}

@keyframes success-bounce-dark {
    0% { transform: translateX(24px) scale(1); }
    50% { transform: translateX(24px) scale(1.1); }
    100% { transform: translateX(24px) scale(1); }
}

[data-theme="dark"] .mobile-theme-toggle.success .mobile-theme-toggle-thumb {
    animation: success-bounce-mobile-dark 0.4s ease-out;
}

@keyframes success-bounce-mobile-dark {
    0% { transform: translateX(28px) scale(1); }
    50% { transform: translateX(28px) scale(1.1); }
    100% { transform: translateX(28px) scale(1); }
}