.flashcard-header {
            text-align: center;
            margin-bottom: 40px;
        }


        .flashcard-title {
            font-size: 28px;
            font-weight: 600;
            color: #2e3856;
            margin-bottom: 8px;
        }


        .counter {
            font-size: 16px;
            color: #7c8db5;
        }


        .flashcard-container {
            height: 400px;
            perspective: 1000px;
            margin-bottom: 30px;
        }


        .flashcard {
            width: 100%;
            height: 100%;
            position: relative;
            transform-style: preserve-3d;
            transition: transform 0.4s ease;
            cursor: pointer;
        }


        .flashcard.flipped {
            transform: rotateX(180deg);
        }


        .flashcard-container.fade-out {
            animation: fadeOut 0.2s forwards;
        }


        .flashcard-container.fade-in {
            animation: fadeIn 0.2s forwards;
        }


        @keyframes fadeOut {
            from { opacity: 1; }
            to { opacity: 0; }
        }


        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }


        .card-face {
            position: absolute;
            width: 100%;
            height: 100%;
            backface-visibility: hidden;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 40px;
            background: white;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            border: 1px solid #e1e8ed;
        }


        .card-back {
            transform: rotateX(180deg);
            background: #5B21B6; /* darker purple - similar weight to #4257b2 */
            color: white;
            border: 1px solid #4C1D95; /* even deeper purple - like #3b4fa0 */
        }


        .card-text {
            font-size: 20px;
            font-weight: 500;
            line-height: 1.5;
            max-width: 100%;
            word-wrap: break-word;
        }


        .card-back .card-text {
            color: white;
        }


        .controls {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }


        .flashcard-btn {
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }


        .flashcard-btn-primary {
            background: #7C3AED;
            color: white;
        }


        .flashcard-btn-primary:hover {
            background: #6D28D9;
            transform: translateY(-1px);
        }


        .flashcard-btn-secondary {
            background: white;
            color: #7C3AED;
            border: 1px solid #e1e8ed;
        }


        .flashcard-btn-secondary:hover {
            background: #f7f8fc;
            color: #6D28D9;
        }


        .flashcard-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }




        .flashcard-icon {
            width: 16px;
            height: 16px;
            display: inline-block;
        }


        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
        }


        .modal-content {
            background: white;
            margin: 5% auto;
            width: 90%;
            max-width: 500px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
        }


        .modal-header {
            background: #5B21B6;
            color: white;
            padding: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }


        .modal-header h2 {
            font-size: 20px;
            font-weight: 600;
        }






        .modal-body {
            padding: 24px;
        }


        .form-group {
            margin-bottom: 20px;
        }


        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: #2e3856;
        }


        .form-group textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #e1e8ed;
            border-radius: 8px;
            font-size: 14px;
            font-family: inherit;
            resize: vertical;
            transition: border-color 0.2s ease;
        }


        .form-group textarea:focus {
            outline: none;
            border-color: #4257b2;
        }


        .modal-actions {
            display: flex;
            justify-content: flex-end;
            gap: 12px;
            margin-top: 24px;
        }


        @media (prefers-color-scheme: dark) {



            .flashcard-title {
                color: #E0E7FF;
            }


            .counter {
                color: #94A3B8;
            }


            .flashcard-container {
                background: transparent;
            }


            .card-face {
                background: #1E293B;
                color: #E0E7FF;
                border-color: #334155;
            }


            .card-back {
                background: #4C1D95;
                border-color: #5B21B6;
                color: #F8FAFC;
            }


            .card-text {
                color: #E0E7FF;
            }


            .flashcard-btn-primary {
                background: linear-gradient(135deg, #6366F1, #8B5CF6);
                color: white;
            }


            .flashcard-btn-primary:hover {
                background: linear-gradient(135deg, #4F46E5, #7C3AED);
                box-shadow: 0 0 15px rgba(139, 92, 246, 0.3);
            }


            .flashcard-btn-secondary {
                background: #1E293B;
                color: #C4B5FD;
                border-color: #334155;
            }


            .flashcard-btn-secondary:hover {
                background: #334155;
                color: #C4B5FD;
            }


            .modal-content {
                background: #1E293B;
                color: #F8FAFC;
                border: 1px solid #334155;
            }


            .modal-header {
                background: #4C1D95;
                color: white;
            }


            .form-group label {
                color: #CBD5E1;
            }


            .form-group textarea {
                background: #0F172A;
                border-color: #334155;
                color: #F8FAFC;
            }


            .form-group textarea:focus {
                border-color: #7C3AED;
            }


            .hint-display {
                background: #3F3F46;
                border-color: #A78BFA;
            }


            .hint-display .text-sm {
                color: #D8B4FE;
            }


            .flashcard-icon {
                color: #C4B5FD;
            }
        }