:root {
            --primary-red: #D32F2F;
            --primary-red-dark: #B71C1C;
            --light-gray: #f8f9fa;
            --medium-gray: #dee2e6;
            --dark-gray: #495057;
            --text-color: #212529;
            --white: #ffffff;
            --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }

/* Lightbox */
        .mcqblust-lightbox {
            position: fixed;
            inset: 0;
            z-index: 2147483647;
            /* highest possible z-index */
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(5px);
        }

        #mcqblust-container {
            background-color: white;
            border-radius: 0.5rem;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
            width: 91.666667%;
            max-width: 42rem;
            max-height: 90vh;
            overflow-y: auto;
            padding: 2rem;
            position: relative;
            transform: scale(0.95);
            opacity: 0;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }

 #mcqblust-close-btn {
    position: fixed;   /* instead of absolute */
    top: 15px;
    left: 15px;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #e60000;
    transition: background-color 0.2s ease, transform 0.2s ease;
    z-index: 2147483648;  /* keeps it on top of everything */
}


        #mcqblust-close-btn:hover {
            background-color: rgba(255, 255, 255, 1);
            transform: scale(1.1);
        }
 /* Challenge Info Screen */
        .challenge-info-card {
            background-color: #f9fafb;
            border: 1px solid #e5e7eb;
            border-radius: 0.5rem;
            padding: 1.5rem;
            text-align: center;
        }
        .challenge-info-card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .challenge-info-card p {
            color: #4b5563;
            margin-bottom: 1.5rem;
        }
        .challenge-stats {
            display: flex;
            justify-content: space-around;
            margin-bottom: 2rem;
        }
        .stat-item {
            text-align: center;
        }
        .stat-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: #e55146;
        }
        .stat-label {
            font-size: 0.875rem;
            color: #c6cad1;
        }
        /* Common button style */
        .mcqblust-back-btn,
        .mcqblust-lang-btn,
        .mode-btn {
            background-color: #e60000;
            /* Red background */
            color: #ffffff;
            /* White text */
            border: none;
            /* No border */
            border-radius: 8px;
            /* Rounded corners */
            padding: 10px 20px;
            /* Padding */
            font-size: 16px;
            /* Font size */
            font-weight: 600;
            /* Slightly bold */
            cursor: pointer;
            /* Pointer on hover */
            transition: background-color 0.3s, transform 0.2s;
            /* Smooth hover effect */
            display: inline-flex;
            /* Align icon and text nicely */
            align-items: center;
            gap: 8px;
            /* Space between icon and text */
        }

        /* Hover effect */
        .mcqblust-back-btn:hover,
        .mcqblust-lang-btn:hover,
        .mode-btn:hover {
            background-color: #ffffff;
            /* White on hover */
            color: #e60000;
            transform: translateY(-2px);
            /* Slight lift effect */
        }

        /* Optional: Active/click effect */
        .mcqblust-back-btn:active,
        .mcqblust-lang-btn:active,
        .mode-btn:active {
            background-color: #cc0000;
            /* Darker red when clicked */
            color: #ffffff;
            transform: translateY(0);
        }



        /* General Screen & Button Styles */
        .screen-title {
            font-size: 1.5rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 1.5rem;
        }

        .btn-primary {
            background-color: #e60000;
            color: white;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }

        .btn-primary:hover {
            background-color: #ffffff;
            color: #e60000;
        }

        .btn-primary:disabled {
            background-color: #f5c6c6;
            color: #a50000;
            cursor: not-allowed;
        }

        .btn-secondary {
            background-color: #b30000;
            color: white;
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }

        .btn-secondary:hover {
            background-color: #ffffff;
            color: #b30000;
        }

        /* Language & Mode Screens */
        .flex-center-gap {
            display: flex;
            justify-content: center;
            gap: 1rem;
        }

        .mcqblust-lang-btn {
            width: 8rem;
            height: 8rem;
            font-size: 1.25rem;
            font-weight: 600;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.3), 0 2px 4px -2px rgba(230, 0, 0, 0.2);
            transition: box-shadow 0.3s ease;
        }

        .mcqblust-lang-btn:hover {
            box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.3), 0 4px 6px -4px rgba(230, 0, 0, 0.2);
        }

        .mode-btn {
            padding: 1.5rem;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.3), 0 2px 4px -2px rgba(230, 0, 0, 0.2);
            transition: box-shadow 0.3s ease;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .mode-btn:hover {
            box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.3), 0 4px 6px -4px rgba(230, 0, 0, 0.2);
        }

        /* Forms */
        .form-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1rem;
        }

        .form-input,
        .form-select {
            width: 100%;
            padding: 0.75rem;
            border-radius: 0.375rem;
            background-color: #f8fafc;
            border: 1px solid #cbd5e1;
        }

        .form-space-y>*+* {
            margin-top: 1rem;
        }

        .form-actions {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 1rem;
        }

        /* Lobby & Join Game */
        .invite-link-container {
            background-color: #f1f5f9;
            padding: 0.75rem;
            border-radius: 0.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        #mcqblust-invite-link {
            background: transparent;
            border: none;
            width: 100%;
            color: #374151;
        }

        #mcqblust-copy-link-btn {
            margin-left: 1rem;
            padding: 0.5rem;
            background-color: #e60000;
            color: white;
            border-radius: 0.375rem;
        }

        #mcqblust-copy-link-btn:hover {
            background-color: #b30000;
        }

        #mcqblust-copy-feedback {
            color: #cc0000;
            height: 1rem;
            margin-top: 0.5rem;
        }

        #mcqblust-player-list {
            list-style: disc;
            list-style-position: inside;
            text-align: left;
            max-width: 24rem;
            margin: 0 auto;
        }

        #mcqblust-start-game-feedback {
            color: #6b7280;
            font-size: 0.875rem;
            margin-top: 0.5rem;
            height: 1rem;
        }

        /* Loading Spinner */
        .spinner {
            animation: spin 1s linear infinite;
            border-radius: 50%;
            width: 4rem;
            height: 4rem;
            border-bottom: 4px solid #e60000;
            margin: 0 auto;
        }

        @keyframes spin {
            from {
                transform: rotate(0deg);
            }

            to {
                transform: rotate(360deg);
            }
        }

        /* Game Screen */
        .game-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }

        #mcqblust-game-timer {
            font-size: 1.25rem;
            font-weight: 700;
            color: #e60000;
        }

        .question-counter {
            font-size: 1rem;
            font-weight: 600;
            color: #b30000;
        }

        #mcqblust-question-text {
            background-color: #f9fafb;
            padding: 1.5rem;
            border-radius: 0.5rem;
            box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
            margin-bottom: 1.5rem;
            font-size: 1.25rem;
            font-weight: 500;
            color: #1f2937;
        }

        .options-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1rem;
        }

        .option-btn {
            padding: 1rem;
            border-radius: 0.5rem;
            text-align: left;
            border: 2px solid #e60000;
            transition: all 0.2s ease-in-out;
        }

        .option-btn.selected {
            background-color: #e60000;
            border-color: #b30000;
            color: white;
        }

        .game-nav {
            display: flex;
            justify-content: space-between;
            margin-top: 2rem;
        }

        #mcqblust-btn-skip {
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            color: #b30000;
            font-weight: 600;
        }

        #mcqblust-btn-skip:hover {
            background-color: #f5c6c6;
        }

        #mcqblust-btn-submit {
            background-color: #e60000;
        }

        #mcqblust-btn-submit:hover {
            background-color: #b30000;
        }

        /* Results Screen */
        .results-header {
            text-align: center;
            font-size: 1.125rem;
            font-weight: 500;
            margin-bottom: 1.5rem;
        }

        .results-summary-container {
            max-height: 60vh;
            overflow-y: auto;
            padding-right: 0.5rem;
        }

.result-card {
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid;
    margin-bottom: 1rem;
}

        .result-card-correct {
            border-color: #a7f3d0;
            background-color: #d1fae5;
        }

        .result-card-incorrect {
            border-color: #fecaca;
            background-color: #fee2e2;
        }

        .result-option {
            padding: 0.5rem;
            margin: 0.25rem 0;
            border-radius: 0.25rem;
        }

        .result-option-correct {
            background-color: #a7f3d0;
        }

        .result-option-incorrect {
            background-color: #fecaca;
        }

        .explanation {
            margin-top: 0.5rem;
            font-size: 0.875rem;
            color: #4b5563;
            background-color: #f3f4f6;
            padding: 0.5rem;
            border-radius: 0.25rem;
        }

        /* Responsive Design */
        @media (min-width: 768px) {
            #mcqblust-container {
                width: 66.666667%;
            }

            .form-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .options-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        [data-theme="dark"] .mcqblust-lightbox {
            background-color: rgba(30, 30, 30, 0.85) !important;
            backdrop-filter: blur(6px) !important;
        }

        [data-theme="dark"] #mcqblust-container {
            background-color: #1e1e1e !important;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8) !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] #mcqblust-close-btn {
            background-color: rgba(30, 30, 30, 0.9) !important;
            color: #e60000 !important;
        }

        [data-theme="dark"] #mcqblust-close-btn:hover {
            background-color: rgba(50, 50, 50, 1) !important;
        }

        [data-theme="dark"] .mcqblust-back-btn,
        [data-theme="dark"] .mcqblust-lang-btn,
        [data-theme="dark"] .mode-btn {
            background-color: #e60000 !important;
            color: #f5f5f5 !important;
            border: none !important;
        }

        [data-theme="dark"] .mcqblust-back-btn:hover,
        [data-theme="dark"] .mcqblust-lang-btn:hover,
        [data-theme="dark"] .mode-btn:hover {
            background-color: #330000 !important;
            color: #e60000 !important;
            transform: translateY(-2px);
        }

        [data-theme="dark"] .mcqblust-back-btn:active,
        [data-theme="dark"] .mcqblust-lang-btn:active,
        [data-theme="dark"] .mode-btn:active {
            background-color: #660000 !important;
            color: #f5f5f5 !important;
            transform: translateY(0);
        }

        [data-theme="dark"] .screen-title {
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .btn-primary {
            background-color: #e60000 !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .btn-primary:hover {
            background-color: #330000 !important;
            color: #e60000 !important;
        }

        [data-theme="dark"] .btn-primary:disabled {
            background-color: #4a1a1a !important;
            color: #660000 !important;
            cursor: not-allowed;
        }

        [data-theme="dark"] .btn-secondary {
            background-color: #440000 !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .btn-secondary:hover {
            background-color: #660000 !important;
            color: #e60000 !important;
        }

        [data-theme="dark"] .mcqblust-lang-btn {
            box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.6), 0 2px 4px -2px rgba(230, 0, 0, 0.4) !important;
            background-color: #2a2a2a !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .mcqblust-lang-btn:hover {
            box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.8), 0 4px 6px -4px rgba(230, 0, 0, 0.6) !important;
            background-color: #3d3d3d !important;
        }

        [data-theme="dark"] .mode-btn {
            box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.6), 0 2px 4px -2px rgba(230, 0, 0, 0.4) !important;
            background-color: #2a2a2a !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .mode-btn:hover {
            box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.8), 0 4px 6px -4px rgba(230, 0, 0, 0.6) !important;
            background-color: #3d3d3d !important;
        }

        [data-theme="dark"] .form-input,
        [data-theme="dark"] .form-select {
            background-color: #2a2a2a !important;
            border: 1px solid #444 !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .form-input::placeholder,
        [data-theme="dark"] .form-select::placeholder {
            color: #999 !important;
        }

        [data-theme="dark"] .invite-link-container {
            background-color: #2a2a2a !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] #mcqblust-invite-link {
            color: #ddd !important;
        }

        [data-theme="dark"] #mcqblust-copy-link-btn {
            background-color: #e60000 !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] #mcqblust-copy-link-btn:hover {
            background-color: #b30000 !important;
        }

        [data-theme="dark"] #mcqblust-copy-feedback {
            color: #cc4444 !important;
        }

        [data-theme="dark"] #mcqblust-player-list {
            color: #ddd !important;
        }

        [data-theme="dark"] #mcqblust-start-game-feedback {
            color: #999 !important;
        }

        [data-theme="dark"] .spinner {
            border-bottom-color: #e60000 !important;
        }

        [data-theme="dark"] #mcqblust-game-timer {
            color: #e60000 !important;
        }

        [data-theme="dark"] .question-counter {
            color: #b30000 !important;
        }

        [data-theme="dark"] #mcqblust-question-text {
            background-color: #2a2a2a !important;
            color: #f5f5f5 !important;
            box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.8) !important;
        }

        [data-theme="dark"] .option-btn {
            border: 2px solid #e60000 !important;
            background-color: transparent !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .option-btn.selected {
            background-color: #e60000 !important;
            border-color: #b30000 !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] #mcqblust-btn-skip {
            color: #b30000 !important;
        }

        [data-theme="dark"] #mcqblust-btn-skip:hover {
            background-color: #4a1a1a !important;
        }

        [data-theme="dark"] #mcqblust-btn-submit {
            background-color: #e60000 !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] #mcqblust-btn-submit:hover {
            background-color: #b30000 !important;
        }

        [data-theme="dark"] .result-card {
            border-color: #333 !important;
            background-color: #2a2a2a !important;
            color: #f5f5f5 !important;
        }

        [data-theme="dark"] .result-card-correct {
            border-color: #1f4d3d !important;
            background-color: #264d3d !important;
            color: #a7f3d0 !important;
        }

        [data-theme="dark"] .result-card-incorrect {
            border-color: #661111 !important;
            background-color: #4d1f1f !important;
            color: #fecaca !important;
        }

        [data-theme="dark"] .result-option-correct {
            background-color: #1f4d3d !important;
            color: #a7f3d0 !important;
        }

        [data-theme="dark"] .result-option-incorrect {
            background-color: #661111 !important;
            color: #fecaca !important;
        }

        [data-theme="dark"] .explanation {
            background-color: #333 !important;
            color: #ccc !important;
        }        /* Lightbox */
.mcqblust-lightbox {
    position: fixed;
    inset: 0;
    z-index: 2147483647; /* highest possible z-index */
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
}
        #mcqblust-container {
            background-color: white;
            border-radius: 0.5rem;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
            width: 91.666667%;
            max-width: 42rem;
            max-height: 90vh;
            overflow-y: auto;
            padding: 2rem;
            position: relative;
            transform: scale(0.95);
            opacity: 0;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }
 
#mcqblust-close-btn {
    position: absolute;
    top: 15px;
    left: 15px;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #e60000;
    transition: background-color 0.2s ease, transform 0.2s ease;
    z-index: 2147483648; /* above the lightbox */
}

#mcqblust-close-btn:hover {
    background-color: rgba(255, 255, 255, 1);
    transform: scale(1.1);
}

/* Common button style */
.mcqblust-back-btn,
.mcqblust-lang-btn,
.mode-btn {
    background-color: #e60000;   /* Red background */
    color: #ffffff;              /* White text */
    border: none;                /* No border */
    border-radius: 8px;          /* Rounded corners */
    padding: 10px 20px;          /* Padding */
    font-size: 16px;             /* Font size */
    font-weight: 600;            /* Slightly bold */
    cursor: pointer;             /* Pointer on hover */
    transition: background-color 0.3s, transform 0.2s; /* Smooth hover effect */
    display: inline-flex;        /* Align icon and text nicely */
    align-items: center;
    gap: 8px;                    /* Space between icon and text */
}

/* Hover effect */
.mcqblust-back-btn:hover,
.mcqblust-lang-btn:hover,
.mode-btn:hover {
    background-color: #ffffff;  /* White on hover */
    color: #e60000;
    transform: translateY(-2px); /* Slight lift effect */
}

/* Optional: Active/click effect */
.mcqblust-back-btn:active,
.mcqblust-lang-btn:active,
.mode-btn:active {
    background-color: #cc0000;  /* Darker red when clicked */
    color: #ffffff;
    transform: translateY(0);
}



        /* General Screen & Button Styles */
        .screen-title {
            font-size: 1.5rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 1.5rem;
        }
        .btn-primary {
            background-color: #e60000;
            color: white;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #ffffff;
            color: #e60000;
        }
        .btn-primary:disabled {
            background-color: #f5c6c6;
            color: #a50000;
            cursor: not-allowed;
        }
        .btn-secondary {
            background-color: #b30000;
            color: white;
            padding: 0.5rem 1.25rem;
            border-radius: 0.5rem;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }
        .btn-secondary:hover {
            background-color: #ffffff;
            color: #b30000;
        }

        /* Language & Mode Screens */
        .flex-center-gap {
            display: flex;
            justify-content: center;
            gap: 1rem;
        }
        .mcqblust-lang-btn {
            width: 8rem;
            height: 8rem;
            font-size: 1.25rem;
            font-weight: 600;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.3), 0 2px 4px -2px rgba(230, 0, 0, 0.2);
            transition: box-shadow 0.3s ease;
        }
        .mcqblust-lang-btn:hover {
            box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.3), 0 4px 6px -4px rgba(230, 0, 0, 0.2);
        }
        .mode-btn {
            padding: 1.5rem;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.3), 0 2px 4px -2px rgba(230, 0, 0, 0.2);
            transition: box-shadow 0.3s ease;
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .mode-btn:hover {
            box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.3), 0 4px 6px -4px rgba(230, 0, 0, 0.2);
        }

        /* Forms */
        .form-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1rem;
        }
        .form-input, .form-select {
            width: 100%;
            padding: 0.75rem;
            border-radius: 0.375rem;
            background-color: #f8fafc;
            border: 1px solid #cbd5e1;
        }
        .form-space-y > * + * { margin-top: 1rem; }
        .form-actions {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 1rem;
        }

        /* Lobby & Join Game */
        .invite-link-container {
            background-color: #f1f5f9;
            padding: 0.75rem;
            border-radius: 0.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        #mcqblust-invite-link {
            background: transparent;
            border: none;
            width: 100%;
            color: #374151;
        }
        #mcqblust-copy-link-btn {
            margin-left: 1rem;
            padding: 0.5rem;
            background-color: #e60000;
            color: white;
            border-radius: 0.375rem;
        }
        #mcqblust-copy-link-btn:hover { background-color: #b30000; }
        #mcqblust-copy-feedback { color: #cc0000; height: 1rem; margin-top: 0.5rem; }
        #mcqblust-player-list { list-style: disc; list-style-position: inside; text-align: left; max-width: 24rem; margin: 0 auto; }
        #mcqblust-start-game-feedback { color: #6b7280; font-size: 0.875rem; margin-top: 0.5rem; height: 1rem; }

        /* Loading Spinner */
        .spinner {
            animation: spin 1s linear infinite;
            border-radius: 50%;
            width: 4rem;
            height: 4rem;
            border-bottom: 4px solid #e60000;
            margin: 0 auto;
        }
        @keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
        
        /* Game Screen */
        .game-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }
        #mcqblust-game-timer { font-size: 1.25rem; font-weight: 700; color: #e60000; }
        .question-counter { font-size: 1rem; font-weight: 600; color: #b30000; }
        #mcqblust-question-text {
            background-color: #f9fafb;
            padding: 1.5rem;
            border-radius: 0.5rem;
            box-shadow: inset 0 2px 4px 0 rgba(0,0,0,0.05);
            margin-bottom: 1.5rem;
            font-size: 1.25rem;
            font-weight: 500;
            color: #1f2937;
        }
        .options-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1rem;
        }
        .option-btn {
            padding: 1rem;
            border-radius: 0.5rem;
            text-align: left;
            border: 2px solid #e60000;
            transition: all 0.2s ease-in-out;
        }
        .option-btn.selected { background-color: #e60000; border-color: #b30000; color: white; }
        .game-nav { display: flex; justify-content: space-between; margin-top: 2rem; }
        #mcqblust-btn-skip { padding: 0.5rem 1.25rem; border-radius: 0.5rem; color: #b30000; font-weight: 600; }
        #mcqblust-btn-skip:hover { background-color: #f5c6c6; }
        #mcqblust-btn-submit { background-color: #e60000; }
        #mcqblust-btn-submit:hover { background-color: #b30000; }

        /* Results Screen */
        .results-header { text-align: center; font-size: 1.125rem; font-weight: 500; margin-bottom: 1.5rem; }
        .results-summary-container { max-height: 60vh; overflow-y: auto; padding-right: 0.5rem; }
        .result-card {
            padding: 1rem;
            border-radius: 0.5rem;
            border: 1px solid;
        }
        .result-card-correct { border-color: #a7f3d0; background-color: #d1fae5; }
        .result-card-incorrect { border-color: #fecaca; background-color: #fee2e2; }
        .result-option { padding: 0.5rem; margin: 0.25rem 0; border-radius: 0.25rem; }
        .result-option-correct { background-color: #a7f3d0; }
        .result-option-incorrect { background-color: #fecaca; }
        .explanation { margin-top: 0.5rem; font-size: 0.875rem; color: #4b5563; background-color: #f3f4f6; padding: 0.5rem; border-radius: 0.25rem; }

        /* Responsive Design */
        @media (min-width: 768px) {
            #mcqblust-container { width: 66.666667%; }
            .form-grid { grid-template-columns: repeat(2, 1fr); }
            .options-grid { grid-template-columns: repeat(2, 1fr); }
        }

[data-theme="dark"] .mcqblust-lightbox {
    background-color: rgba(30, 30, 30, 0.85) !important;
    backdrop-filter: blur(6px) !important;
}

[data-theme="dark"] #mcqblust-container {
    background-color: #1e1e1e !important;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8) !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] #mcqblust-close-btn {
    background-color: rgba(30, 30, 30, 0.9) !important;
    color: #e60000 !important;
}

[data-theme="dark"] #mcqblust-close-btn:hover {
    background-color: rgba(50, 50, 50, 1) !important;
}

[data-theme="dark"] .mcqblust-back-btn,
[data-theme="dark"] .mcqblust-lang-btn,
[data-theme="dark"] .mode-btn {
    background-color: #e60000 !important;
    color: #f5f5f5 !important;
    border: none !important;
}

[data-theme="dark"] .mcqblust-back-btn:hover,
[data-theme="dark"] .mcqblust-lang-btn:hover,
[data-theme="dark"] .mode-btn:hover {
    background-color: #330000 !important;
    color: #e60000 !important;
    transform: translateY(-2px);
}

[data-theme="dark"] .mcqblust-back-btn:active,
[data-theme="dark"] .mcqblust-lang-btn:active,
[data-theme="dark"] .mode-btn:active {
    background-color: #660000 !important;
    color: #f5f5f5 !important;
    transform: translateY(0);
}

[data-theme="dark"] .screen-title {
    color: #f5f5f5 !important;
}

[data-theme="dark"] .btn-primary {
    background-color: #e60000 !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] .btn-primary:hover {
    background-color: #330000 !important;
    color: #e60000 !important;
}

[data-theme="dark"] .btn-primary:disabled {
    background-color: #4a1a1a !important;
    color: #660000 !important;
    cursor: not-allowed;
}

[data-theme="dark"] .btn-secondary {
    background-color: #440000 !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] .btn-secondary:hover {
    background-color: #660000 !important;
    color: #e60000 !important;
}

[data-theme="dark"] .mcqblust-lang-btn {
    box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.6), 0 2px 4px -2px rgba(230, 0, 0, 0.4) !important;
    background-color: #2a2a2a !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] .mcqblust-lang-btn:hover {
    box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.8), 0 4px 6px -4px rgba(230, 0, 0, 0.6) !important;
    background-color: #3d3d3d !important;
}

[data-theme="dark"] .mode-btn {
    box-shadow: 0 4px 6px -1px rgba(230, 0, 0, 0.6), 0 2px 4px -2px rgba(230, 0, 0, 0.4) !important;
    background-color: #2a2a2a !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] .mode-btn:hover {
    box-shadow: 0 10px 15px -3px rgba(230, 0, 0, 0.8), 0 4px 6px -4px rgba(230, 0, 0, 0.6) !important;
    background-color: #3d3d3d !important;
}

[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select {
    background-color: #2a2a2a !important;
    border: 1px solid #444 !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] .form-input::placeholder,
[data-theme="dark"] .form-select::placeholder {
    color: #999 !important;
}

[data-theme="dark"] .invite-link-container {
    background-color: #2a2a2a !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] #mcqblust-invite-link {
    color: #ddd !important;
}

[data-theme="dark"] #mcqblust-copy-link-btn {
    background-color: #e60000 !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] #mcqblust-copy-link-btn:hover {
    background-color: #b30000 !important;
}

[data-theme="dark"] #mcqblust-copy-feedback {
    color: #cc4444 !important;
}

[data-theme="dark"] #mcqblust-player-list {
    color: #ddd !important;
}

[data-theme="dark"] #mcqblust-start-game-feedback {
    color: #999 !important;
}

[data-theme="dark"] .spinner {
    border-bottom-color: #e60000 !important;
}

[data-theme="dark"] #mcqblust-game-timer {
    color: #e60000 !important;
}

[data-theme="dark"] .question-counter {
    color: #b30000 !important;
}

[data-theme="dark"] #mcqblust-question-text {
    background-color: #2a2a2a !important;
    color: #f5f5f5 !important;
    box-shadow: inset 0 2px 4px 0 rgba(0,0,0,0.8) !important;
}

[data-theme="dark"] .option-btn {
    border: 2px solid #e60000 !important;
    background-color: transparent !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] .option-btn.selected {
    background-color: #e60000 !important;
    border-color: #b30000 !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] #mcqblust-btn-skip {
    color: #b30000 !important;
}

[data-theme="dark"] #mcqblust-btn-skip:hover {
    background-color: #4a1a1a !important;
}

[data-theme="dark"] #mcqblust-btn-submit {
    background-color: #e60000 !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] #mcqblust-btn-submit:hover {
    background-color: #b30000 !important;
}

[data-theme="dark"] .result-card {
    border-color: #333 !important;
    background-color: #2a2a2a !important;
    color: #f5f5f5 !important;
}

[data-theme="dark"] .result-card-correct {
    border-color: #1f4d3d !important;
    background-color: #264d3d !important;
    color: #a7f3d0 !important;
}

[data-theme="dark"] .result-card-incorrect {
    border-color: #661111 !important;
    background-color: #4d1f1f !important;
    color: #fecaca !important;
}

[data-theme="dark"] .result-option-correct {
    background-color: #1f4d3d !important;
    color: #a7f3d0 !important;
}

[data-theme="dark"] .result-option-incorrect {
    background-color: #661111 !important;
    color: #fecaca !important;
}

[data-theme="dark"] .explanation {
    background-color: #333 !important;
    color: #ccc !important;
}

/* Dark mode - Challenge Info Screen */
[data-theme="dark"] .challenge-info-card {
    background-color: #1e1e1e;  /* dark card background */
    border: 1px solid #333333;  /* dark border */
    color: #e0e0e0;             /* default text color */
}

[data-theme="dark"] .challenge-info-card h3 {
    color: #ffffff;             /* heading white */
}

[data-theme="dark"] .challenge-info-card p {
    color: #bbbbbb;             /* lighter text for paragraph */
}

[data-theme="dark"] .challenge-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 2rem;
}

[data-theme="dark"] .stat-item {
    text-align: center;
}

[data-theme="dark"] .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ff4d4d;             /* bright red for stats */
}

[data-theme="dark"] .stat-label {
    font-size: 0.875rem;
    color: #9e9e9e;             /* muted text in dark mode */
}