:root { 
            --primary-color:#5a4bda;
            --primary-hover:#4a3bc8;
            --primary-rgb:90 75 218;
            --primary-color-rgb:90, 75, 218;
            --secondary-color:#6d61e7;
            --accent-color:#f972b9;
            --text-primary:#333333;
            --text-secondary:#666666;
            --text-tertiary:#999999;
            --bg-primary:#ffffff; 
            --bg-secondary:#f5f7fa;
            --bg-tertiary:#eaedf3;
            --card-bg:#ffffff;
            --card-border:#eaedf3;
            --card-shadow:0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --card-shadow-hover:0 6px 16px rgba(90, 75, 218, 0.12), 0 3px 8px rgba(90, 75, 218, 0.08),
                    0 1px 4px rgba(90, 75, 218, 0.06);
            --skeleton-bg:#f0f0f0;
            --skeleton-shine:rgba(255, 255, 255, 0.8);
            --success-color:#10b981;
            --error-color:#ef4444;
            --warning-color:#f59e0b;
            --info-color:#3b82f6;
            --border-radius-sm:0.375rem;
            --border-radius:0.5rem;
            --border-radius-lg:0.75rem;
            --border-radius-xl:1rem;
            --spacing-xs:0.25rem;
            --spacing-sm:0.5rem;
            --spacing:1rem;
            --spacing-md:1.5rem;
            --spacing-lg:2rem;
            --spacing-xl:3rem;
            --transition-fast:150ms ease;
            --transition:300ms ease;
            --transition-slow:500ms ease;
            --container-width:1400px;
            --header-height:4rem;
            --footer-height:3rem;
            --box-shadow:0 8px 20px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.1), 0 2px 6px rgba(0, 0, 0, 0.08);

            /* Compatibility mappings */
            --bg-card: var(--card-bg);
            --border-color: var(--card-border);
            --shadow: var(--card-shadow);
            --accent-hover: var(--primary-hover);
            --subject-img-bg: var(--bg-primary);
        }
        
        body {
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
            min-height: 100vh;
            padding-top: var(--header-height);
            transition: background-color var(--transition), color var(--transition);
            
            /* Compatibility mappings to dynamically inherit from body's active theme variables */
            --bg-card: var(--card-bg);
            --border-color: var(--card-border);
            --shadow: var(--card-shadow);
            --accent-hover: var(--primary-hover);
            --subject-img-bg: var(--bg-primary);
        }

        body.light {
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        /* 10 Custom Themes Property Declarations */
        .dark-mode {
            --primary-color:#6d62ee;
            --primary-hover:#7c72f5;
            --primary-rgb:109 98 238;
            --primary-color-rgb:109, 98, 238;
            --secondary-color:#5a4fcd;
            --text-primary:#ffffff;
            --text-secondary:#d0d0d0;
            --text-tertiary:#a0a0a0;
            --bg-primary:#000000;
            --bg-secondary:#0a0a0a;
            --bg-tertiary:#141414;
            --card-bg:#0a0a0a;
            --card-border:#1a1a1a;
            --card-shadow:0 8px 32px rgba(0, 0, 0, 0.9), 0 4px 16px rgba(0, 0, 0, 0.8), 0 2px 8px rgba(0, 0, 0, 0.7),
                    0 0 0 1px rgba(109, 98, 238, 0.15);
            --card-shadow-hover:0 12px 48px rgba(109, 98, 238, 0.4), 0 8px 32px rgba(109, 98, 238, 0.3),
                    0 4px 16px rgba(109, 98, 238, 0.2), 0 0 0 2px rgba(109, 98, 238, 0.5);
            --skeleton-bg:#141414;
            --skeleton-shine:rgba(255, 255, 255, 0.03);
            --enhanced-shadow:0 0 0 1px rgba(109, 98, 238, 0.3), 0 4px 16px rgba(0, 0, 0, 0.8);
            --enhanced-shadow-hover:0 0 0 2px rgba(109, 98, 238, 0.6), 0 8px 32px rgba(0, 0, 0, 0.9);
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        .sandalwood-mode {
            --primary-color:#c18c5d;
            --primary-hover:#a67347;
            --primary-rgb:193 140 93;
            --primary-color-rgb:193, 140, 93;
            --secondary-color:#dcb68a;
            --accent-color:#e6c8a4;
            --text-primary:#3e2723;
            --text-secondary:#5d4037;
            --text-tertiary:#8d6e63;
            --bg-primary:#f7f2ea;
            --bg-secondary:#efe7d8;
            --bg-tertiary:#e5d9c2;
            --card-bg:#ffffff;
            --card-border:#e2d8c3;
            --card-shadow:0 4px 12px rgba(193, 140, 93, 0.12), 0 2px 6px rgba(193, 140, 93, 0.08);
            --card-shadow-hover:0 6px 16px rgba(193, 140, 93, 0.2), 0 3px 8px rgba(193, 140, 93, 0.15);
            --skeleton-bg:#efe7d8;
            --skeleton-shine:rgba(255, 255, 255, 0.5);
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        .forest-emerald {
            --primary-color:#1b4d3e;
            --primary-hover:#12352a;
            --primary-rgb:27 77 62;
            --primary-color-rgb:27, 77, 62;
            --secondary-color:#52b788;
            --accent-color:#74c69d;
            --text-primary:#122822;
            --text-secondary:#2d5a4c;
            --text-tertiary:#5c8d7e;
            --bg-primary:#f0f7f4;
            --bg-secondary:#e1efe8;
            --bg-tertiary:#cedfd6;
            --card-bg:#ffffff;
            --card-border:#cadcd2;
            --card-shadow:0 4px 12px rgba(27, 77, 62, 0.08), 0 2px 6px rgba(27, 77, 62, 0.05);
            --card-shadow-hover:0 6px 16px rgba(27, 77, 62, 0.15), 0 3px 8px rgba(27, 77, 62, 0.1);
            --skeleton-bg:#e1efe8;
            --skeleton-shine:rgba(255, 255, 255, 0.5);
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        .ocean-deep {
            --primary-color:#00adb5;
            --primary-hover:#00828a;
            --primary-rgb:0 173 181;
            --primary-color-rgb:0, 173, 181;
            --secondary-color:#393e46;
            --accent-color:#00f5ff;
            --text-primary:#ffffff;
            --text-secondary:#d0d5dd;
            --text-tertiary:#98a2b3;
            --bg-primary:#0a0e17;
            --bg-secondary:#101623;
            --bg-tertiary:#172032;
            --card-bg:#101623;
            --card-border:#1d293d;
            --card-shadow:0 8px 32px rgba(0, 173, 181, 0.08), 0 4px 16px rgba(0, 0, 0, 0.8);
            --card-shadow-hover:0 12px 48px rgba(0, 173, 181, 0.3), 0 8px 32px rgba(0, 173, 181, 0.2),
                    0 0 0 2px rgba(0, 173, 181, 0.4);
            --skeleton-bg:#172032;
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        .sakura-blossom {
            --primary-color:#d85a7f;
            --primary-hover:#c04568;
            --primary-rgb:216 90 127;
            --primary-color-rgb:216, 90, 127;
            --secondary-color:#fbc3d1;
            --accent-color:#ffdee6;
            --text-primary:#4a1c27;
            --text-secondary:#7c3d4b;
            --text-tertiary:#a67580;
            --bg-primary:#fff6f8;
            --bg-secondary:#fae5ea;
            --bg-tertiary:#f5d5dd;
            --card-bg:#ffffff;
            --card-border:#f7d8df;
            --card-shadow:0 4px 12px rgba(216, 90, 127, 0.08), 0 2px 6px rgba(216, 90, 127, 0.05);
            --card-shadow-hover:0 6px 16px rgba(216, 90, 127, 0.15), 0 3px 8px rgba(216, 90, 127, 0.1);
            --skeleton-bg:#fae5ea;
            --skeleton-shine:rgba(255, 255, 255, 0.5);
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        .dracula-midnight {
            --primary-color:#bd93f9;
            --primary-hover:#a878e6;
            --primary-rgb:189 147 249;
            --primary-color-rgb:189, 147, 249;
            --secondary-color:#282a36;
            --accent-color:#ff79c6;
            --text-primary:#f8f8f2;
            --text-secondary:#b3b3b3;
            --text-tertiary:#808080;
            --bg-primary:#18181f;
            --bg-secondary:#21212a;
            --bg-tertiary:#2a2b36;
            --card-bg:#21212a;
            --card-border:#323342;
            --card-shadow:0 8px 32px rgba(189, 147, 249, 0.08), 0 4px 16px rgba(0, 0, 0, 0.8);
            --card-shadow-hover:0 12px 48px rgba(189, 147, 249, 0.35), 0 8px 32px rgba(189, 147, 249, 0.25),
                    0 0 0 2px rgba(189, 147, 249, 0.5);
            --skeleton-bg:#2a2b36;
            --skeleton-shine:rgba(255, 255, 255, 0.03);
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        .lavender-mist {
            --primary-color:#8b5cf6;
            --primary-hover:#7c3aed;
            --primary-rgb:139 92 246;
            --primary-color-rgb:139, 92, 246;
            --secondary-color:#ddd6fe;
            --accent-color:#ede9fe;
            --text-primary:#1e1b4b;
            --text-secondary:#4c1d95;
            --text-tertiary:#6d28d9;
            --bg-primary:#f5f3ff;
            --bg-secondary:#ede9fe;
            --bg-tertiary:#ddd6fe;
            --card-bg:#ffffff;
            --card-border:#ddd6fe;
            --card-shadow:0 4px 12px rgba(139, 92, 246, 0.08), 0 2px 6px rgba(139, 92, 246, 0.05);
            --card-shadow-hover:0 4px 12px rgba(139, 92, 246, 0.08), 0 2px 6px rgba(139, 92, 246, 0.05);
            --skeleton-bg:#ede9fe;
            --skeleton-shine:rgba(255, 255, 255, 0.5);
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        .cyberpunk-neon {
            --primary-color:#00ffff;
            --primary-hover:#00cccc;
            --primary-rgb:0 255 255;
            --primary-color-rgb:0, 255, 255;
            --secondary-color:#0d0e15;
            --accent-color:#ff0055;
            --text-primary:#ffffff;
            --text-secondary:#00ffff;
            --text-tertiary:#ff0055;
            --bg-primary:#050508;
            --bg-secondary:#0d0e15;
            --bg-tertiary:#161722;
            --card-bg:#0d0e15;
            --card-border:#161722;
            --card-shadow:0 8px 32px rgba(0, 255, 255, 0.08), 0 4px 16px rgba(0, 0, 0, 0.8);
            --card-shadow-hover:0 8px 32px rgba(0, 255, 255, 0.08), 0 4px 16px rgba(0, 0, 0, 0.8);
            --skeleton-bg:#161722;
            --skeleton-shine:rgba(255, 255, 255, 0.03);
            background-color: var(--bg-primary) !important;
            color: var(--text-primary) !important;
        }

        /* Dark mode overrides for background cards & borders */
        body:not(.light) .bg-card-bg { background-color: var(--bg-card) !important; }
        body:not(.light) .border-border-gray { border-color: var(--border-color) !important; }

        /* Header - Full Width */
        #appHeader {
            height: var(--header-height);
            background-color: var(--bg-card);
            border-bottom: 1px solid var(--border-color);
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
        }

        .header-left {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .header-logo {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        
        .header-logo-img {
            width: 40px;
            height: 40px;
            object-fit: contain;
            border-radius: 8px;
        }
        
        .header-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
            letter-spacing: -0.4px;
            line-height: 1;
        }

        .header-controls {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .header-btn {
            width: 36px;
            height: 36px;
            border: 1px solid rgba(var(--primary-color-rgb), 0.15) !important;
            border-radius: 50%;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
            box-shadow: 0 6px 18px rgba(var(--primary-color-rgb), 0.35) !important;
        }

        .header-btn:hover {
            border-color: var(--primary-color) !important;
            border-width: 1.5px !important;
            background-color: var(--border-color);
            color: var(--primary-color) !important;
            transform: translateY(-2px) scale(1.05);
            box-shadow: 0 8px 24px rgba(var(--primary-color-rgb), 0.5) !important;
        }

        @media (max-width: 768px) {
            .header-btn {
                width: 32px;
                height: 32px;
            }
        }

        /* Logo static rounded design with permanent glow shadow and theme-color border */
        .header-logo-img {
            border-radius: 50%;
            border: 2px solid var(--primary-color) !important;
            box-shadow: 0 0 16px rgba(var(--primary-color-rgb), 0.5) !important;
        }

        #backBtn {
            background: var(--card-bg) !important;
            color: var(--primary-color) !important;
            border: 1px solid var(--card-border) !important;
        }

        #backBtn:hover {
            transform: none !important;
        }

        /* Main Content - Full Width */
        #mainContent {
            margin-left: 0;
            max-width: 100%;
            width: 100%;
            padding: 2rem;
        }

        @media (max-width: 768px) {
            #appHeader {
                padding: 0 16px;
            }

            #mainContent {
                padding: 0.75rem;
            }

            .header-btn {
                width: 32px;
                height: 32px;
            }

            #pageTitle {
                font-size: 16px;
            }
        }

        /* All existing styles */
        .card-hover {
            transition: all 0.3s ease;
            cursor: pointer;
            user-select: none;
        }
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(var(--primary-color-rgb), 0.3);
        }
        .card-hover:active {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(var(--primary-color-rgb), 0.2);
        }
        .cursor-pointer {
            cursor: pointer !important;
        }
        .tab-active {
            background-color: var(--primary-color) !important;
            color: white !important;
        }
        .tab-inactive {
            background: var(--card-bg);
            color: var(--text-secondary);
            border: 1px solid var(--card-border);
        }
        .tab-inactive:hover {
            background: var(--bg-secondary);
            color: var(--text-primary);
        }

        /* Dark mode tab overrides */
        body:not(.light) .tab-inactive {
            background: var(--card-bg) !important;
            color: var(--text-secondary) !important;
            border-color: var(--card-border) !important;
        }
        body:not(.light) .tab-inactive:hover {
            background: var(--bg-secondary) !important;
            color: var(--text-primary) !important;
        }
        body:not(.light) .tab-active {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) !important;
            color: white !important;
            box-shadow: 0 4px 15px rgba(var(--primary-color-rgb), 0.3) !important;
            border: none !important;
        }
        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            line-clamp: 2;
            overflow: hidden;
        }
        .search-container {
            position: relative;
        }
        .search-results {
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 0.5rem;
            max-height: 400px;
            overflow-y: auto;
            z-index: 50;
            display: none;
            scrollbar-width: thin;
            scrollbar-color: var(--primary-color) var(--bg-tertiary);
        }
        .search-results::-webkit-scrollbar {
            width: 6px;
        }
        .search-results::-webkit-scrollbar-track {
            background: #2a2a2a;
            border-radius: 3px;
        }
        .search-results::-webkit-scrollbar-thumb {
            background: var(--primary-color);
            border-radius: 3px;
        }
        .search-results::-webkit-scrollbar-thumb:hover {
            background: var(--secondary-color);
        }
        
        @keyframes pageFadeIn {
            0% { opacity: 0; transform: translateY(12px); }
            100% { opacity: 1; transform: translateY(0); }
        }
        .page-animate-in {
            animation: pageFadeIn 0.35s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
        }

        @keyframes dropdownFadeIn {
            0% { opacity: 0; transform: translateY(-8px) scale(0.98); }
            100% { opacity: 1; transform: translateY(0) scale(1); }
        }
        .search-results-wrapper {
            display: none;
            background: #1a1a1a;
        }
        .search-results-wrapper.show-anim,
        .search-results.show-anim {
            display: block !important;
            animation: dropdownFadeIn 0.25s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
            transform-origin: top center;
        }
        
        /* Test Series Sub-Tabs */
        .test-sub-tab {
            padding: 8px 20px;
            border-radius: 8px;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
            border: 1px solid transparent;
        }
        .test-sub-tab.active {
            background: var(--primary-color);
            color: white;
            box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.3);
        }
        .test-sub-tab:not(.active) {
            background: var(--bg-secondary);
            color: var(--text-secondary);
            border-color: var(--border-color);
        }
        .test-sub-tab:not(.active):hover {
            background: var(--border-color);
            color: var(--text-primary);
        }

        .search-result-item {
            padding: 0.75rem;
            border-bottom: 1px solid var(--card-border);
            cursor: pointer;
            transition: background-color 0.2s;
        }
        .search-result-item:hover {
            background-color: var(--bg-secondary);
        }
        .search-result-item:last-child {
            border-bottom: none;
        }
        .skeleton {
            background: linear-gradient(90deg, var(--card-border) 25%, var(--bg-tertiary) 50%, var(--card-border) 75%);
            background-size: 200% 100%;
            animation: skeleton-loading 1.5s infinite;
        }
        @keyframes skeleton-loading {
            0% { background-position: 200% 0; }
            100% { background-position: -200% 0; }
        }
        .skeleton-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 0.5rem;
            overflow: hidden;
        }
        .skeleton-image {
            width: 100%;
            height: 160px;
            background: var(--bg-secondary);
            border-radius: 0.375rem;
        }
        .skeleton-text {
            height: 16px;
            margin-bottom: 8px;
            border-radius: 0.25rem;
        }
        .skeleton-text.short {
            width: 60%;
        }
        .skeleton-text.medium {
            width: 80%;
        }
        .skeleton-text.long {
            width: 100%;
        }
        
        /* Progress bar styles */
        .progress-bar {
            width: 100%;
            height: 6px;
            background: #2a2a2a;
            border-radius: 3px;
            overflow: hidden;
        }
        
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            border-radius: 3px;
            transition: width 0.3s ease;
        }
        
        body.light .progress-bar {
            background: #e5e7eb;
        }
        .pw-progress-bar-bg {
            background-color: #2a2a2a;
        }
        body.light .pw-progress-bar-bg {
            background-color: #e5e7eb !important;
        }
        
        /* Enhanced skeleton for better loading experience */
        .skeleton-pulse {
            background: linear-gradient(90deg, #2a2a2a 25%, #3a3a3a 50%, #2a2a2a 75%);
            background-size: 200% 100%;
            animation: skeleton-pulse 1.5s ease-in-out infinite;
        }
        
        @keyframes skeleton-pulse {
            0% { background-position: 200% 0; opacity: 1; }
            50% { opacity: 0.7; }
            100% { background-position: -200% 0; opacity: 1; }
        }
        
        /* Tab swipe functionality */
        .tab-container {
            position: relative;
            overflow: hidden;
        }
        
        .tab-swipe-area {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 1;
        }
        
        /* Enhanced tab button styles */
        .tab-button {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            transform-origin: center;
        }
        
        .tab-button:hover {
            transform: translateY(-2px);
        }
        
        .tab-button:active {
            transform: scale(0.95);
        }
        
        /* Smooth content transitions */
        .content-area {
            transition: opacity 0.3s ease-in-out;
        }
        
        .content-area.hidden {
            opacity: 0;
            pointer-events: none;
        }
        
        /* Enhanced card hover effects */
        .topic-card {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        .topic-card:hover {
            transform: translateY(-8px) scale(1.02);
            box-shadow: 0 25px 50px rgba(90, 75, 218, 0.4);
        }
        
        /* Smooth progress bar animations */
        .progress-fill {
            transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        /* Enhanced search input */
        .search-input {
            transition: all 0.3s ease;
        }
        
        .search-input:focus {
            transform: scale(1.02);
            border-color: var(--primary-color) !important;
            box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb), 0.15) !important;
        }
        
        /* Smooth tab transitions */
        .tab-button {
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        /* Enhanced video card animations */
        .video-card {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        .video-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }
        
        /* Enhanced responsive design */
        .main-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        
        @media (min-width: 1024px) {
            .main-container {
                padding: 0 2rem;
            }
        }
        
        @media (max-width: 768px) {
            .topic-card {
                padding: 1rem;
            }
            
            .tab-button {
                padding: 0.5rem 1rem;
                font-size: 0.75rem;
            }
            
            .main-container {
                padding: 0 0.5rem;
            }
        }
        
        @media (max-width: 640px) {
            .grid-cols-1 {
                gap: 1rem;
            }
            
            .topic-card h3 {
                font-size: 1rem;
            }
            
            .progress-bar {
                height: 4px;
            }
        }
        
        /* Smooth scrolling */
        html {
            scroll-behavior: smooth;
        }
        
        /* Better touch targets */
        .tab-button {
            min-height: 44px;
            min-width: 44px;
        }
        
        .topic-card {
            min-height: 120px;
        }
        
        /* Light theme overrides */
        body.light { background: var(--bg-primary) !important; color: #1f2937 !important; }
        body.light .bg-card-bg { background-color: var(--bg-card) !important; }
        body.light .border-border-gray { border-color: var(--border-color) !important; }
        body.light .text-white { color: var(--text-primary) !important; }
        body.light .text-gray-300 { color: var(--text-secondary) !important; }
        body.light .text-gray-400 { color: #9ca3af !important; }
        body.light .text-gray-500 { color: #6b7280 !important; }
        body.light .placeholder-gray-400::placeholder { color: #9ca3af !important; }
        body.light .search-results { background: var(--bg-card) !important; border-color: var(--border-color) !important; }
        body.light #loadingOverlay { background-color: rgba(255,255,255,0.8) !important; }
        body.light #loadingOverlay span { color: #1f2937 !important; }
        body.light .skeleton-card { background: var(--bg-card) !important; border-color: var(--border-color) !important; }
        body.light .skeleton-image { background: #f3f4f6 !important; }
        body.light .tab-inactive { background: var(--bg-card) !important; color: var(--text-secondary) !important; border-color: var(--border-color) !important; }
        body.light .tab-inactive:hover { background: var(--bg-secondary) !important; color: var(--text-primary) !important; }
        body.light .tab-active { background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) !important; color: white !important; }
        body.light .btn-premium { background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%) !important; color: #111827 !important; }
        body.light .bg-gray-800 { background-color: var(--bg-card) !important; }
        body.light .hover\:bg-gray-700:hover { background-color: var(--bg-secondary) !important; }
        .bg-custom-purple { background-color: var(--primary-color) !important; }
        .hover\:bg-purple-600:hover { background-color: var(--primary-hover) !important; }
        .text-custom-purple { color: var(--primary-color) !important; }
        .hover\:text-purple-400:hover { color: var(--primary-hover) !important; }
        
        /* Dynamic Theme Breadcrumbs Hover & Active */
        .breadcrumb-item {
            color: var(--text-secondary) !important;
            background-color: transparent !important;
            transition: all 0.15s ease !important;
        }
        .breadcrumb-item:hover {
            color: var(--ac-color) !important;
            background-color: rgba(var(--ac-rgba), 0.10) !important;
        }
        .breadcrumb-item-active {
            color: var(--ac-color) !important;
            background-color: rgba(var(--ac-rgba), 0.10) !important;
        }
        
        /* Dynamic Theme Badges on Batch Details Hero Card */
        .hero-badge {
            background-color: rgba(var(--primary-color-rgb), 0.12) !important;
            color: var(--primary-color) !important;
        }
        
        /* Keep button text white in light mode */
        body.light .btn-pw-app { color: white !important; font-weight: bold !important; }
        body.light .btn-lets-study { color: white !important; font-weight: bold !important; }
        body.light .btn-download { color: white !important; font-weight: bold !important; }
        
        /* Ensure buttons are bold in both modes */
        .btn-pw-app, .btn-lets-study, .btn-download { font-weight: bold !important; }
        
        /* Faculty cards in light mode */
        body.light .faculty-card { background-color: #f8fafc !important; }
        
        /* Content tabs in dark mode */
        body.dark .content-tabs-card,
        body:not(.light) .content-tabs-card { background: var(--card-bg) !important; border-color: var(--card-border) !important; }
        
        /* Notes and DPP cards download button text color */
        body.light .notes-download-btn { color: white !important; }
        body.light .dpp-download-btn { color: white !important; }
        
        /* Theme-aware image placeholders */
        .img-placeholder { background-color: var(--bg-secondary) !important; }
        body.light .img-placeholder { background-color: #e5e7eb !important; }
        
        .no-img-bg { background-color: var(--bg-tertiary) !important; }
        body.light .no-img-bg { background-color: #f3f4f6 !important; }
        
        
        /* Announcement Card Styling */
        .announcement-card {
            box-shadow: 0 0 15px rgba(0, 0, 0, 0.15);
            border: none !important;
            transition: none !important;
        }
        .announcement-card:hover {
            box-shadow: 0 0 15px rgba(0, 0, 0, 0.15) !important;
            transform: none !important;
        }
        .announcement-card.is-mahapack {
            box-shadow: 0 0 15px rgba(255, 107, 53, 0.25) !important;
            border: 1px solid rgba(255, 107, 53, 0.2) !important;
        }
        body.dark .announcement-card,
        body:not(.light) .announcement-card {
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(var(--primary-color-rgb), 0.15) !important;
            background: var(--card-bg) !important;
        }
        body.dark .announcement-card.is-mahapack,
        body:not(.light) .announcement-card.is-mahapack {
            box-shadow: 0 0 15px rgba(255, 107, 53, 0.2) !important;
            border: 1px solid rgba(255, 107, 53, 0.25) !important;
        }
        /* Search Result Highlight */
        .batch-card-wrap.is-highlighted {
            border: 1px solid rgba(var(--primary-color-rgb), 0.6) !important;
            box-shadow: 0 0 0 1px rgba(var(--primary-color-rgb), 0.4), 0 15px 40px -10px rgba(var(--primary-color-rgb), 0.3) !important;
        }
        .batch-card-wrap.is-highlighted::after {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(var(--primary-color-rgb), 0.08);
            pointer-events: none;
            z-index: 50;
        }

        body.dark .batch-card-wrap.is-highlighted,
        body:not(.light) .batch-card-wrap.is-highlighted {
            border: 1px solid rgba(var(--primary-color-rgb), 0.8) !important;
            box-shadow: 0 0 0 1px rgba(var(--primary-color-rgb), 0.6), 0 12px 35px -5px rgba(var(--primary-color-rgb), 0.25) !important;
        }
        body.dark .batch-card-wrap.is-highlighted::after,
        body:not(.light) .batch-card-wrap.is-highlighted::after {
            background: rgba(var(--primary-color-rgb), 0.15);
        }
        
        /* Search input highlighting */
        .search-highlight {
            color: var(--primary-color) !important;
            font-weight: bold;
        }

        /* Premium button */
        .btn-premium { background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%); color: #111827; }
        .btn-premium:hover { filter: brightness(0.95); }

        /* Selected card styles */
        .selected-card {
            border-color: var(--primary-color) !important;
            box-shadow: 0 0 0 1px var(--primary-color) !important;
        }
        .selected-card .text-white {
            color: var(--primary-color) !important;
        }
        body.light .selected-card .text-white {
            color: var(--primary-color) !important;
        }

        .content-tabs-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 0.75rem;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        
        /* Content tabs spacing */
        .content-tabs-card .flex {
            gap: 0.75rem;
        }
        
        .content-tabs-card .grid {
            gap: 0.5rem;
        }
        
        .content-tabs-card .tab-button {
            padding: 0.75rem 1.5rem;
            margin: 0 0.25rem;
        }
        
        /* Mobile tabs - ensure proper sizing */
        @media (max-width: 768px) {
            .content-tabs-card .tab-button {
                padding: 0.5rem 0.75rem;
                font-size: 0.75rem;
                min-height: 2.5rem;
            }
        }

        /* Batch details tabs */
        .tab-item {
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .tab-item:hover .tab-text {
            color: var(--primary-color) !important;
        }

        .tab-text {
            font-size: 0.875rem;
            font-weight: 500;
            transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .tab-underline {
            transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* Tab content */
        .tab-content {
            transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .tab-content.hidden {
            display: none;
        }

        /* Batch description text - ensure visibility in both themes */
        .batch-description-text {
            color: #d1d5db;
            line-height: 1.6;
        }

        body.light .batch-description-text {
            color: #374151;
        }

        /* Announcement attachment image */
        .announcement-attachment {
            aspect-ratio: 16/9;
            object-fit: cover;
            border-radius: 0.5rem;
            width: 100%;
            height: auto;
        }

        /* Image popup modal */
        #imagePopup {
            backdrop-filter: blur(4px);
        }

        #imagePopup img {
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
        }

        /* Video card styles */
        .video-image {
            transition: opacity 0.3s ease;
        }

        .video-menu-popup {
            min-width: 180px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
        }

        .video-menu-popup button {
            border-radius: 0.375rem;
        }

        .video-menu-popup button:first-child {
            border-top-left-radius: 0.5rem;
            border-top-right-radius: 0.5rem;
        }

        .video-menu-popup button:last-child {
            border-bottom-left-radius: 0.5rem;
            border-bottom-right-radius: 0.5rem;
        }

        /* Ensure cross icon is always white */
        #closeImagePopup svg {
            stroke: white !important;
        }

        #closeImagePopup:hover svg {
            stroke: #d1d5db !important;
        }

        /* Ensure URLs don't overflow in announcement cards and have theme-aware high contrast colors */
        .announcement-card a {
            word-break: break-all;
            overflow-wrap: break-word;
            max-width: 100%;
            color: var(--primary-color) !important;
            text-decoration: underline;
            font-weight: 600;
            transition: color var(--transition-fast);
        }
        .announcement-card a:hover {
            color: var(--primary-hover) !important;
        }

        /* Card text overflow prevention */
        .announcement-text {
            word-wrap: break-word;
            overflow-wrap: break-word;
            hyphens: auto;
        }
        
        

        /* LIGHT MODE — Details Box */
        /* LIGHT MODE — Details Box */
        .test-info-grid {
            background: linear-gradient(
                180deg,
                #FFFFFF 0%,
                #FAFBFF 100%
            );
            border: 1px solid #E6EAF2;
            box-shadow: 6px 6px 14px -4px rgba(0, 0, 0, 0.22);
            transition: all 0.3s ease;
        }

        /* Divider */
        .test-info-divider {
            border-top: 1px solid #E6EAF2;
        }

        /* LIGHT MODE — Fix Text Colors inside details box */
        body.light .test-info-grid span:first-child {
            color: #6B7280 !important;   /* label text: Questions, Duration */
        }

        body.light .test-info-grid span:last-child {
            color: #111827 !important;   /* value text: 90, 180m */
            font-weight: 700 !important;
        }

        /* LIGHT MODE — Mark Done Button */
        body.light #test-grid .bg-white {
            background: #FFFFFF !important;
            border: none !important;
            color: #1F2937 !important;
            box-shadow: 0 4px 10px rgba(0,0,0,0.03);
        }

        /* START NOW button — old original premium purple */
        .test-primary-btn {
            background: linear-gradient(
                135deg,
                var(--primary-color) 0%,
                var(--primary-color) 100%
            ) !important;
            border: none !important;
            box-shadow: 0 8px 20px rgba(var(--primary-color-rgb), 0.18);
        }

        .test-primary-btn:hover {
            background: linear-gradient(
                135deg,
                var(--primary-hover) 0%,
                var(--primary-hover) 100%
            ) !important;
            transform: translateY(-1px);
            box-shadow: 0 10px 24px rgba(var(--primary-color-rgb), 0.24);
        }

        /* DARK MODE keep same */
        body.dark .test-info-grid,
        body:not(.light) .test-info-grid {
            background: #060608 !important;
            border: 1px solid rgba(255, 255, 255, 0.08) !important;
            box-shadow: 0 8px 24px rgba(0,0,0,0.25) !important;
        }

        body.dark .test-info-divider,
        body:not(.light) .test-info-divider {
            border-top: 1px solid rgba(255, 255, 255, 0.08) !important;
        }

        /* Top Action / Generic Button styles */
        .btn-top-action {
            background-color: #ffffff !important;
            color: #1f2937 !important;
            border-color: #e5e7eb !important;
            transition: all 0.3s ease !important;
        }
        .btn-top-action:hover {
            color: var(--primary-color) !important;
            border-color: var(--primary-color) !important;
            background-color: #f9fafb !important;
        }
        
        body:not(.light) .btn-top-action,
        body.dark .btn-top-action {
            background-color: #09090b !important;
            color: #a1a1aa !important;
            border: 1px solid rgba(255, 255, 255, 0.15) !important;
        }
        body:not(.light) .btn-top-action:hover,
        body.dark .btn-top-action:hover {
            color: #ffffff !important;
            background-color: #121216 !important;
            border-color: rgba(var(--primary-color-rgb), 0.65) !important;
        }

        /* Content Card Dark overrides */
        body:not(.light) .ss-content-card,
        body.dark .ss-content-card {
            background-color: var(--bg-card) !important;
            border: 1px solid rgba(255, 255, 255, 0.08) !important;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4) !important;
        }
        body:not(.light) .ss-content-card:hover,
        body.dark .ss-content-card:hover {
            border-color: rgba(90, 75, 218, 0.45) !important;
            box-shadow: 0 8px 30px rgba(90, 75, 218, 0.2) !important;
        }
        
                /* Button hover effects */
        .btn-lets-study:hover,
        .btn-download:hover {
            color: var(--primary-color) !important;
        }
        
        /* PW APP button - no color change on hover */
        .btn-pw-app:hover {
            color: white !important;
        }
        
        /* Let's Study button - always white text */
        .btn-lets-study,
        .btn-lets-study:hover {
            color: white !important;
        }
        
        /* Top action buttons hover effects - Others and Telegram */
        .bg-gray-800:hover {
            color: var(--primary-color) !important;
        }
        
        /* Light mode button colors and hover effects */
        body.light .bg-white {
            background-color: white !important;
            color: #1f2937 !important;
            border: 1px solid #e5e7eb !important;
        }
        
        body.light .bg-white:hover {
            color: var(--primary-color) !important;
            border-color: var(--primary-color) !important;
        }
        
        /* Dark mode hover effects */
        body.dark .bg-gray-800:hover {
            color: var(--primary-color) !important;
        }
        
        /* View PDF button hover effect */
        .bg-gray-600:hover {
            color: var(--primary-color) !important;
        }
        
        /* Download button - no color change on hover */
        .btn-download:hover {
            color: white !important;
        }
        
        /* View PDF button styling */
        .view-pdf-btn {
            background-color: #4b5563 !important;
            color: white !important;
        }
        
        .view-pdf-btn:hover {
            background-color: #374151 !important;
            color: var(--primary-color) !important;
        }
        
        /* Light mode View PDF button */
        body.light .view-pdf-btn {
            background-color: white !important;
            color: #1f2937 !important;
            border: 1px solid #e5e7eb !important;
        }
        
        body.light .view-pdf-btn:hover {
            color: var(--primary-color) !important;
            border-color: var(--primary-color) !important;
        }
        
        /* Mobile dark theme buttons - Others and Telegram */
        @media (max-width: 768px) {
            .bg-white {
                background-color: #000000 !important;
                color: #d1d5db !important;
            }
            
            .bg-white:hover {
                color: var(--primary-color) !important;
            }
        }
        
        /* Light mode mobile buttons */
        body.light .bg-white {
            background-color: white !important;
            color: #1f2937 !important;
        }
        
        /* Video card image hover effects */
        .aspect-video img {
            transition: transform 0.3s ease !important;
        }
        .aspect-video:hover img {
            transform: scale(1.05) !important;
        }
 
        /* Dark mode custom overrides for premium pitch dark style */
        body:not(.light) .search-results {
            background: var(--card-bg) !important;
            border-color: var(--card-border) !important;
            scrollbar-color: var(--primary-color) var(--bg-primary) !important;
        }
        body:not(.light) .search-results::-webkit-scrollbar-track {
            background: var(--card-bg) !important;
        }
        body:not(.light) .search-results-wrapper {
            background: var(--card-bg) !important;
        }
        body:not(.light) .search-result-item {
            border-bottom-color: var(--card-border) !important;
        }
        body:not(.light) .search-result-item:hover {
            background-color: var(--bg-secondary) !important;
        }
        body:not(.light) .skeleton {
            background: linear-gradient(90deg, var(--card-bg) 25%, var(--bg-secondary) 50%, var(--card-bg) 75%) !important;
        }
        body:not(.light) .skeleton-card {
            background: var(--card-bg) !important;
            border-color: var(--card-border) !important;
        }
        body:not(.light) .skeleton-image {
            background: var(--bg-secondary) !important;
        }
        body:not(.light) .skeleton-pulse {
            background: linear-gradient(90deg, var(--card-bg) 25%, var(--bg-secondary) 50%, var(--card-bg) 75%) !important;
        }
        body:not(.light) .content-tabs-card {
            background: var(--card-bg) !important;
            border-color: var(--card-border) !important;
        }
        body:not(.light) #recentlyWatchedSection {
            background: var(--card-bg) !important;
            border-color: var(--card-border) !important;
        }

        /* Additional elements compatibility classes */
        .app-header {
            background-color: var(--card-bg) !important;
            border-bottom: 1px solid var(--card-border) !important;
            transition: background-color var(--transition), border-color var(--transition);
        }
        .logo {
            transition: transform var(--transition-fast);
        }
        .logo:hover {
            transform: scale(1.05);
        }
        .icon-btn {
            background-color: var(--bg-secondary) !important;
            color: var(--text-primary) !important;
            transition: all var(--transition-fast) !important;
        }
        .icon-btn:hover {
            background-color: var(--bg-tertiary) !important;
            color: var(--primary-color) !important;
            transform: translateY(-1px);
        }
        .app-footer {
            color: var(--text-tertiary) !important;
            border-top: 1px solid var(--card-border) !important;
            transition: all var(--transition);
        }

        /* Dynamic Theme Specific Layout Overrides */
        .cyberpunk-neon #appHeader {
            border-bottom: 2px solid var(--primary-color) !important;
            box-shadow: 0 0 15px rgba(0, 255, 255, 0.2) !important;
        }
        .cyberpunk-neon .theme-modal-container {
            border: 2px solid var(--primary-color) !important;
            box-shadow: 0 0 25px rgba(0, 255, 255, 0.15) !important;
        }
        .dracula-midnight #appHeader {
            border-bottom: 1px solid rgba(189, 147, 249, 0.3) !important;
        }
        .sakura-blossom #appHeader {
            background-color: var(--bg-secondary) !important;
            border-bottom: 1px solid var(--card-border) !important;
        }
        .sandalwood-mode #appHeader {
            background-color: var(--bg-secondary) !important;
            border-bottom: 1px solid var(--card-border) !important;
        }
        .forest-emerald #appHeader {
            background-color: var(--bg-secondary) !important;
            border-bottom: 1px solid var(--card-border) !important;
        }
        .ocean-deep #appHeader {
            border-bottom: 1px solid rgba(0, 173, 181, 0.3) !important;
        }

        /* Theme Selector Modal Styles */
        .theme-modal-overlay {
            position: fixed;
            inset: 0;
            background-color: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 100;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        .theme-modal-overlay.active {
            opacity: 1;
            pointer-events: auto;
        }
        .theme-modal-container {
            background-color: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--border-radius-xl, 1rem);
            box-shadow: var(--box-shadow);
            width: 90%;
            max-width: 580px;
            max-height: 85vh;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            transform: scale(0.95);
            transition: transform 0.3s ease;
        }
        .theme-modal-overlay.active .theme-modal-container {
            transform: scale(1);
        }
        .theme-modal-header {
            padding: 1.25rem 1.5rem;
            border-bottom: 1px solid var(--card-border);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .theme-modal-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
        }
        .theme-modal-close {
            background: none;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
            padding: 0.25rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background-color var(--transition-fast), color var(--transition-fast);
        }
        .theme-modal-close:hover {
            background-color: var(--bg-secondary);
            color: var(--text-primary);
        }
        .theme-modal-body {
            padding: 1.5rem;
            overflow-y: auto;
            flex: 1;
            scrollbar-width: thin;
        }
        .theme-modal-body::-webkit-scrollbar {
            width: 6px;
        }
        .theme-modal-body::-webkit-scrollbar-track {
            background: transparent;
        }
        .theme-modal-body::-webkit-scrollbar-thumb {
            background-color: var(--card-border);
            border-radius: 3px;
        }
        .theme-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
        }
        @media (max-width: 480px) {
            .theme-grid {
                grid-template-columns: 1fr;
            }
        }
        .theme-card {
            background-color: var(--bg-secondary);
            border: 2px solid transparent;
            border-radius: var(--border-radius-lg, 0.75rem);
            padding: 1rem;
            cursor: pointer;
            position: relative;
            display: flex;
            align-items: center;
            gap: 1rem;
            transition: all var(--transition-fast);
        }
        .theme-card:hover {
            background-color: var(--bg-tertiary);
            transform: translateY(-2px);
        }
        .theme-card.active {
            border-color: var(--primary-color);
            background-color: rgba(var(--primary-color-rgb), 0.08);
        }
        .theme-card-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: var(--card-bg);
            color: var(--primary-color);
            flex-shrink: 0;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .theme-card-info {
            flex: 1;
            min-width: 0;
        }
        .theme-card-name {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0;
        }
        .theme-card-desc {
            font-size: 0.75rem;
            color: var(--text-tertiary);
            margin: 0;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .theme-card-badge {
            position: absolute;
            top: 0.5rem;
            right: 0.5rem;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transform: scale(0.8);
            transition: all var(--transition-fast);
        }
        .theme-card.active .theme-card-badge {
            opacity: 1;
            transform: scale(1);
        }
        
        /* Batches Cards Action Bar Modification */
        .batch-action-bar {
            position: absolute !important;
            bottom: 12px !important;
            left: 12px !important;
            right: 12px !important;
            display: flex !important;
            align-items: center !important;
            justify-content: space-between !important;
            background: rgba(var(--primary-color-rgb), 0.12) !important;
            border: 1px solid rgba(var(--primary-color-rgb), 0.08) !important;
            padding: 2px 2px 2px 12px !important;
            border-radius: 10px !important;
            box-sizing: border-box !important;
            transition: all 0.2s ease !important;
            z-index: 10 !important;
        }
        body.dark .batch-action-bar,
        body:not(.light) .batch-action-bar {
            background: rgba(var(--primary-color-rgb), 0.15) !important;
            border: 1px solid rgba(255, 255, 255, 0.03) !important;
        }
        .batch-date-wrap {
            display: flex !important;
            align-items: center !important;
            gap: 6px !important;
            color: var(--text-primary) !important;
            font-weight: 600 !important;
            font-size: 12.5px !important;
        }
        .batch-calendar-icon {
            width: 15px !important;
            height: 15px !important;
            color: var(--primary-color) !important;
            flex-shrink: 0 !important;
            opacity: 0.85 !important;
        }
        .btn-lets-study {
            background: var(--primary-color) !important;
            color: white !important;
            border: none !important;
            padding: 9px 18px !important;
            border-radius: 8px !important;
            font-weight: 700 !important;
            font-size: 12px !important;
            display: flex !important;
            align-items: center !important;
            gap: 6px !important;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
            cursor: pointer !important;
            box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.45) !important;
        }
        .btn-lets-study:hover {
            transform: translateY(-1px) !important;
            box-shadow: 0 6px 18px rgba(var(--primary-color-rgb), 0.6) !important;
            filter: brightness(1.1) !important;
            color: white !important;
        }
        .btn-lets-study:active {
            transform: translateY(1px) !important;
        }