:root {
        --bg-color: #f5f7fa;
        --card-bg: #ffffff;
        --text-primary: #2d3748;
        --text-secondary: #4a5568;
        --accent-color: #4299e1;
        --accent-hover: #3182ce;
        --border-color: #e2e8f0;
        --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.1);
        --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
        --shadow-heavy: 0 10px 15px rgba(0, 0, 0, 0.1);
        --success-color: #48bb78;
        --error-color: #f56565;
        --warning-color: #ed8936;
        --info-color: #38b2ac;
        --german-text: #2b6cb0;
        --meaning-text: #553c9a;

        
        --masculine-color: #3182ce;
        --masculine-light: rgba(49, 130, 206, 0.1);
        --feminine-color: #e53e3e;
        --feminine-light: rgba(229, 62, 62, 0.1);
        --neuter-color: #38a169;
        --neuter-light: rgba(56, 161, 105, 0.1);
        --plural-color: #d69e2e;
        --plural-light: rgba(214, 158, 46, 0.1);

        
        --mastered-color: #38a169;
        --learning-color: #ed8936;
        --new-color: #718096;
      }

      [data-theme="dark"] {
        --bg-color: #1a202c;
        --card-bg: #2d3748;
        --text-primary: #f7fafc;
        --text-secondary: #e2e8f0;
        --accent-color: #63b3ed;
        --accent-hover: #4299e1;
        --border-color: #4a5568;
        --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.3);
        --shadow-heavy: 0 10px 15px rgba(0, 0, 0, 0.3);
        --german-text: #90cdf4;
        --meaning-text: #b794f6;

        
        --masculine-color: #63b3ed;
        --masculine-light: rgba(99, 179, 237, 0.2);
        --feminine-color: #fc8181;
        --feminine-light: rgba(252, 129, 129, 0.2);
        --neuter-color: #68d391;
        --neuter-light: rgba(104, 211, 145, 0.2);
        --plural-color: #f6e05e;
        --plural-light: rgba(246, 224, 94, 0.2);
      }
      [data-theme="dark"] .btn.secondary {
        color: var(--bg-color); 
        font-weight: 600; 
      }

      [data-theme="dark"] .btn.secondary:hover {
        color: var(--bg-color);
      }
      
      .gender-masculine {
        border-left: 4px solid var(--masculine-color);
        background: linear-gradient(
          135deg,
          var(--card-bg),
          var(--masculine-light)
        );
      }

      .gender-feminine {
        border-left: 4px solid var(--feminine-color);
        background: linear-gradient(
          135deg,
          var(--card-bg),
          var(--feminine-light)
        );
      }

      .gender-neuter {
        border-left: 4px solid var(--neuter-color);
        background: linear-gradient(
          135deg,
          var(--card-bg),
          var(--neuter-light)
        );
      }

      .gender-plural {
        border-left: 4px solid var(--plural-color);
        background: linear-gradient(
          135deg,
          var(--card-bg),
          var(--plural-light)
        );
      }

      
      .gender-indicator {
        position: absolute;
        top: 8px;
        right: 8px;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 12px;
        font-weight: bold;
        color: white;
        text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
      }

      .gender-indicator.masculine {
        background: var(--masculine-color);
      }

      .gender-indicator.feminine {
        background: var(--feminine-color);
      }

      .gender-indicator.neuter {
        background: var(--neuter-color);
      }

      .gender-indicator.plural {
        background: var(--plural-color);
      }

      
      .progress-indicator {
        position: absolute;
        top: 8px;
        left: 8px;
        width: 20px;
        height: 20px;
        border-radius: 50%;
        font-size: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
      }

      .progress-new {
        background: var(--new-color);
        color: white;
      }
      .progress-learning {
        background: var(--learning-color);
        color: white;
      }
      .progress-mastered {
        background: var(--mastered-color);
        color: white;
      }

      
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          sans-serif;
        background-color: var(--bg-color);
        color: var(--text-primary);
        line-height: 1.6;
        transition: all 0.3s ease;
        -webkit-tap-highlight-color: transparent;
      }

      .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 16px;
      }

      
      .header {
        background: var(--card-bg);
        border-radius: 16px;
        padding: 20px;
        margin-bottom: 20px;
        box-shadow: var(--shadow-medium);
        border: 1px solid var(--border-color);
      }

      .header h1 {
        font-size: 1.8rem;
        font-weight: 700;
        color: var(--accent-color);
        margin-bottom: 16px;
        text-align: center;
      }

      .controls {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
        align-items: center;
        margin-bottom: 16px;
      }

      .controls .btn {
        flex: 1;
        min-width: 140px;
        justify-content: center;
        white-space: nowrap;
        padding: 10px 12px;
      }

      #shuffleBtn {
        flex: 1;
        min-width: 140px;
        justify-content: center;
        white-space: nowrap;
        padding: 10px 12px;
      }

      .btn {
        background: var(--accent-color);
        color: white;
        border: none;
        padding: 10px 16px;
        border-radius: 8px;
        cursor: pointer;
        font-size: 13px;
        font-weight: 500;
        transition: all 0.2s ease;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 6px;
        min-height: 40px;
        touch-action: manipulation;
        white-space: nowrap;
      }

      .btn:hover {
        background: var(--accent-hover);
        transform: translateY(-1px);
      }

      .btn:active {
        transform: translateY(0);
      }

      .btn:focus {
        outline: 2px solid var(--accent-color);
        outline-offset: 2px;
      }

      .btn.active {
        background: var(--success-color);
      }

      .btn.secondary {
        background: var(--text-secondary);
      }

      .btn.secondary:hover {
        background: var(--text-primary);
      }

      .search-input {
        padding: 10px 14px;
        border: 2px solid var(--border-color);
        border-radius: 8px;
        font-size: 14px;
        background: var(--card-bg);
        color: var(--text-primary);
        min-width: 180px;
        min-height: 40px;
      }

      .search-input:focus {
        outline: none;
        border-color: var(--accent-color);
      }

      .theme-toggle {
        background: var(--card-bg);
        border: 2px solid var(--border-color);
        color: var(--text-primary);
        padding: 10px;
        border-radius: 8px;
        cursor: pointer;
        font-size: 16px;
        min-height: 40px;
        min-width: 40px;
      }

      
      .toggle-group {
        display: flex;
        background: var(--card-bg);
        border: 2px solid var(--border-color);
        border-radius: 8px;
        overflow: hidden;
      }

      .toggle-btn {
        background: transparent;
        border: none;
        padding: 8px 12px;
        font-size: 12px;
        color: var(--text-secondary);
        cursor: pointer;
        transition: all 0.2s ease;
        min-height: 36px;
        flex: 1;
        justify-content: center;
      }

      .toggle-btn.active {
        background: var(--accent-color);
        color: white;
      }

      
      .submenu {
        display: flex;
        gap: 8px;
        margin-top: 10px;
        flex-wrap: wrap;
        justify-content: center;
      }

      .submenu.hidden {
        display: none;
      }

      .submenu .btn {
        font-size: 12px;
        padding: 8px 12px;
        min-height: 36px;
        flex: 1;
        min-width: 140px;
        justify-content: center;
        white-space: nowrap;
      }

      
      .gender-legend {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        justify-content: center;
        align-items: center;
        font-size: 12px;
        color: var(--text-secondary);
      }

      .legend-item {
        display: flex;
        align-items: center;
        gap: 6px;
      }

      .legend-color {
        width: 16px;
        height: 16px;
        border-radius: 50%;
      }

      .legend-color.masculine {
        background: var(--masculine-color);
      }
      .legend-color.feminine {
        background: var(--feminine-color);
      }
      .legend-color.neuter {
        background: var(--neuter-color);
      }
      .legend-color.plural {
        background: var(--plural-color);
      }

      
      .flashcards-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 16px;
        margin-top: 20px;
      }

      .flashcard {
        position: relative;
        width: 100%;
        height: 180px;
        perspective: 1000px;
        cursor: pointer;
      }

      .flashcard-inner {
        position: relative;
        width: 100%;
        height: 100%;
        text-align: center;
        transition: transform 0.6s;
        transform-style: preserve-3d;
      }

      .flashcard.flipped .flashcard-inner {
        transform: rotateY(180deg);
      }

      .flashcard-front,
      .flashcard-back {
        position: absolute;
        width: 100%;
        height: 100%;
        backface-visibility: hidden;
        border-radius: 12px;
        box-shadow: var(--shadow-medium);
        border: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 20px;
        font-size: 1.1rem;
        font-weight: 600;
      }

      .flashcard-front {
        color: var(--german-text);
      }

      .flashcard-back {
        color: var(--meaning-text);
        transform: rotateY(180deg);
      }

      .flashcard:hover .flashcard-inner {
        transform: scale(1.02);
      }

      .flashcard.flipped:hover .flashcard-inner {
        transform: rotateY(180deg) scale(1.02);
      }

      .flashcard:focus {
        outline: 3px solid var(--accent-color);
        outline-offset: 2px;
      }

      
      .sentence-practice {
        background: var(--card-bg);
        border-radius: 12px;
        padding: 24px;
        margin-top: 20px;
        box-shadow: var(--shadow-medium);
        border: 1px solid var(--border-color);
      }

      .practice-word {
        background: linear-gradient(
          135deg,
          var(--accent-color),
          var(--accent-hover)
        );
        color: white;
        padding: 16px 24px;
        border-radius: 12px;
        text-align: center;
        margin-bottom: 20px;
        font-size: 1.3rem;
        font-weight: 600;
      }

      .scramble-container {
        display: grid;
        gap: 20px;
        margin-bottom: 20px;
      }

      .word-bank,
      .answer-area {
        min-height: 80px;
        padding: 16px;
        border: 2px dashed var(--border-color);
        border-radius: 12px;
        background: var(--bg-color);
        transition: all 0.3s ease;
      }

      .word-bank {
        background: rgba(66, 153, 225, 0.05);
      }

      .word-bank.drag-over {
        border-color: var(--accent-color);
        background: rgba(66, 153, 225, 0.1);
      }

      .answer-area {
        background: rgba(72, 187, 120, 0.05);
        border-style: solid;
        min-height: 100px;
      }

      .answer-area.drag-over {
        border-color: var(--success-color);
        background: rgba(72, 187, 120, 0.1);
      }

      .area-label {
        font-size: 14px;
        font-weight: 600;
        color: var(--text-secondary);
        margin-bottom: 12px;
        text-align: center;
      }

      .word-button {
        background: var(--card-bg);
        border: 2px solid var(--border-color);
        color: var(--text-primary);
        padding: 8px 16px;
        margin: 4px;
        border-radius: 8px;
        cursor: pointer;
        font-size: 14px;
        font-weight: 500;
        transition: all 0.2s ease;
        display: inline-block;
        user-select: none;
        touch-action: manipulation;
      }

      .word-button:hover {
        border-color: var(--accent-color);
        background: rgba(66, 153, 225, 0.1);
        transform: translateY(-1px);
      }

      .word-button:active {
        transform: translateY(0);
      }

      .word-button.dragging {
        opacity: 0.5;
        transform: rotate(5deg);
      }

      .practice-controls {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
        margin-bottom: 20px;
      }

      #prevSentenceBtn,
      #nextSentenceBtn,
      #prevClozeBtn,
      #nextClozeBtn {
        flex: 1;
        min-width: 120px;
        justify-content: center;
      }

      .feedback-section {
        margin-top: 20px;
        padding: 20px;
        border-radius: 12px;
        border: 2px solid var(--border-color);
      }

      .feedback-section.success {
        background: rgba(72, 187, 120, 0.1);
        border-color: var(--success-color);
      }

      .feedback-section.error {
        background: rgba(245, 101, 101, 0.1);
        border-color: var(--error-color);
      }

      .feedback-title {
        font-weight: 600;
        margin-bottom: 12px;
        display: flex;
        align-items: center;
        gap: 8px;
      }

      .explanation-box {
        background: rgba(56, 178, 172, 0.1);
        border: 1px solid var(--info-color);
        border-radius: 8px;
        padding: 16px;
        margin-top: 12px;
      }

      .explanation-box h4 {
        color: var(--info-color);
        margin-bottom: 8px;
        font-size: 14px;
      }

      
      .grammar-drill {
        background: var(--card-bg);
        border-radius: 12px;
        padding: 24px;
        margin-top: 20px;
        box-shadow: var(--shadow-medium);
        border: 1px solid var(--border-color);
      }

      .quiz-question {
        text-align: center;
        margin-bottom: 20px;
      }

      .quiz-question h3 {
        font-size: 1.4rem;
        margin-bottom: 16px;
        color: var(--accent-color);
      }

      .word-display {
        font-size: 1.8rem;
        font-weight: 700;
        color: var(--german-text);
        margin-bottom: 20px;
        padding: 20px;
        background: linear-gradient(
          135deg,
          rgba(66, 153, 225, 0.1),
          rgba(56, 178, 172, 0.1)
        );
        border-radius: 12px;
      }

      .article-options {
        display: flex;
        gap: 12px;
        justify-content: center;
        flex-wrap: wrap;
        margin-bottom: 20px;
      }

      .article-btn {
        background: var(--card-bg);
        border: 2px solid var(--border-color);
        color: var(--text-primary);
        padding: 12px 24px;
        border-radius: 8px;
        cursor: pointer;
        font-size: 16px;
        font-weight: 600;
        transition: all 0.2s ease;
        min-width: 80px;
      }

      .article-btn:hover {
        border-color: var(--accent-color);
        background: rgba(66, 153, 225, 0.1);
        transform: translateY(-2px);
      }

      .article-btn.correct {
        background: var(--success-color);
        border-color: var(--success-color);
        color: white;
      }

      .article-btn.incorrect {
        background: var(--error-color);
        border-color: var(--error-color);
        color: white;
      }

      .quiz-input {
        padding: 12px 16px;
        border: 2px solid var(--border-color);
        border-radius: 8px;
        font-size: 16px;
        background: var(--card-bg);
        color: var(--text-primary);
        width: 100%;
        max-width: 300px;
        margin: 8px;
      }

      .quiz-input:focus {
        outline: none;
        border-color: var(--accent-color);
      }

      .quiz-input.correct {
        border-color: var(--success-color);
        background: rgba(72, 187, 120, 0.1);
      }

      .quiz-input.incorrect {
        border-color: var(--error-color);
        background: rgba(245, 101, 101, 0.1);
      }

      .input-group {
        margin: 12px 0;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        flex-wrap: wrap;
      }

      .input-label {
        font-weight: 600;
        min-width: 80px;
        color: var(--text-primary);
      }

      .quiz-controls {
        display: flex;
        gap: 12px;
        justify-content: center;
        flex-wrap: wrap;
        margin-top: 20px;
      }

      .quiz-feedback {
        margin-top: 20px;
        padding: 16px;
        border-radius: 8px;
        text-align: center;
        font-weight: 600;
      }

      .quiz-feedback.correct {
        background: rgba(72, 187, 120, 0.1);
        border: 2px solid var(--success-color);
        color: var(--success-color);
      }

      .quiz-feedback.incorrect {
        background: rgba(245, 101, 101, 0.1);
        border: 2px solid var(--error-color);
        color: var(--error-color);
      }

      
      .pagination-controls {
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 8px;
        margin-top: 24px;
      }

      .page-btn {
        background: var(--card-bg);
        border: 2px solid var(--border-color);
        color: var(--text-primary);
        padding: 8px 14px;
        border-radius: 8px;
        cursor: pointer;
        font-size: 14px;
        font-weight: 500;
        transition: all 0.2s ease;
        min-width: 40px;
      }

      .page-btn:hover {
        border-color: var(--accent-color);
        color: var(--accent-color);
      }

      .page-btn.active {
        background: var(--accent-color);
        border-color: var(--accent-color);
        color: white;
        cursor: default;
      }

      
      .word-list {
        background: var(--card-bg);
        border-radius: 12px;
        box-shadow: var(--shadow-medium);
        border: 1px solid var(--border-color);
        overflow: hidden;
        margin-top: 20px;
      }

      .word-list table {
        width: 100%;
        border-collapse: collapse;
      }

      .word-list th,
      .word-list td {
        padding: 14px 16px;
        text-align: left;
        border-bottom: 1px solid var(--border-color);
      }

      .word-list th {
        background: var(--accent-color);
        color: white;
        font-weight: 600;
        position: sticky;
        top: 0;
        font-size: 14px;
      }

      .word-list tr:hover {
        background: rgba(66, 153, 225, 0.05);
      }

      .german-word {
        color: var(--german-text);
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 10px;
        position: relative;
      }

      .meaning-text {
        color: var(--meaning-text);
        font-weight: 500;
      }

      .speaker-btn {
        background: var(--accent-color);
        color: white;
        border: none;
        padding: 6px 8px;
        border-radius: 6px;
        cursor: pointer;
        font-size: 12px;
        transition: all 0.2s ease;
        min-width: 32px;
        min-height: 28px;
      }

      .speaker-btn:hover {
        background: var(--accent-hover);
        transform: scale(1.1);
      }

      .speaker-btn:focus {
        outline: 2px solid var(--accent-color);
        outline-offset: 1px;
      }

      
      .word-list tr.gender-masculine {
        border-left: 4px solid var(--masculine-color);
      }

      .word-list tr.gender-feminine {
        border-left: 4px solid var(--feminine-color);
      }

      .word-list tr.gender-neuter {
        border-left: 4px solid var(--neuter-color);
      }

      .word-list tr.gender-plural {
        border-left: 4px solid var(--plural-color);
      }

      
      .matching-game {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px;
        margin-top: 20px;
      }

      .matching-column {
        background: var(--card-bg);
        border-radius: 12px;
        padding: 16px;
        box-shadow: var(--shadow-medium);
        border: 1px solid var(--border-color);
      }

      .matching-column h3 {
        text-align: center;
        margin-bottom: 16px;
        color: var(--accent-color);
        font-size: 1.1rem;
      }

      .matching-item {
        padding: 14px 16px;
        margin-bottom: 10px;
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.2s ease;
        border: 2px solid var(--border-color);
        background: var(--card-bg);
        font-weight: 500;
        position: relative;
        min-height: 48px;
        display: flex;
        align-items: center;
      }

      .matching-item:hover {
        border-color: var(--accent-color);
        transform: translateY(-2px);
        box-shadow: var(--shadow-medium);
      }

      .matching-item.selected {
        border-color: var(--accent-color);
        background: rgba(66, 153, 225, 0.1);
      }

      .matching-item.matched {
        background: rgba(72, 187, 120, 0.1);
        border-color: var(--success-color);
        cursor: not-allowed;
        opacity: 0.7;
      }

      .matching-item.error {
        border-color: var(--error-color);
        background: rgba(245, 101, 101, 0.1);
        animation: shake 0.5s ease-in-out;
      }

      @keyframes shake {
        0%,
        20%,
        40%,
        60%,
        80% {
          transform: translateX(0);
        }
        10%,
        30%,
        50%,
        70% {
          transform: translateX(-3px);
        }
      }

      .german-text {
        color: var(--german-text);
      }

      .matching-lines {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        pointer-events: none;
        z-index: 10;
      }

      .connection-line {
        stroke: var(--success-color);
        stroke-width: 3;
        opacity: 0.8;
      }

      .congratulations {
        text-align: center;
        margin-top: 24px;
        padding: 20px;
        background: linear-gradient(135deg, var(--success-color), #38a169);
        color: white;
        border-radius: 12px;
        box-shadow: var(--shadow-medium);
      }

      .congratulations h2 {
        font-size: 1.6rem;
        margin-bottom: 10px;
      }

      
      .stats-panel {
        background: var(--card-bg);
        border-radius: 12px;
        padding: 16px;
        margin-bottom: 16px;
        box-shadow: var(--shadow-medium);
        border: 1px solid var(--border-color);
      }

      .stats-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 12px;
        text-align: center;
      }

      .stat-item {
        padding: 12px;
        border-radius: 8px;
        background: rgba(66, 153, 225, 0.05);
      }

      .stat-number {
        font-size: 1.4rem;
        font-weight: bold;
        color: var(--accent-color);
      }

      .stat-label {
        font-size: 0.8rem;
        color: var(--text-secondary);
        margin-top: 4px;
      }

      
      .streak-display {
        background: linear-gradient(135deg, var(--success-color), #38a169);
        color: white;
        padding: 12px 16px;
        border-radius: 8px;
        text-align: center;
        font-weight: bold;
        margin-bottom: 16px;
      }

      .streak-flame {
        font-size: 1.2rem;
        margin-right: 8px;
      }

      
      .rtl {
        direction: rtl;
        text-align: right;
      }
      

      
      .cloze-text-container {
        background: var(--bg-color);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        padding: 24px;
        font-size: 1.2rem;
        line-height: 2;
        color: var(--text-secondary);
      }

      .cloze-gap {
        display: inline-block;
        width: 150px;
        height: 45px;
        border: 2px dashed var(--border-color);
        border-radius: 8px;
        background-color: var(--card-bg);
        vertical-align: middle;
        margin: 0 4px;
        transition: border-color 0.3s ease;
        position: relative; 
      }

      .cloze-gap.drag-over {
        border-color: var(--accent-color);
      }

      .cloze-gap.correct {
        border-style: solid;
        border-color: var(--success-color);
        background-color: rgba(72, 187, 120, 0.1);
      }

      .cloze-gap.incorrect {
        border-style: solid;
        border-color: var(--error-color);
        background-color: rgba(245, 101, 101, 0.1);
      }

      .cloze-gap .word-button {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 4px;
        font-size: 1rem;
      }

      #clozeWordBank .word-button {
        cursor: grab;
      }

      #clozeWordBank .word-button:active {
        cursor: grabbing;
      }
      

      
      #audioQuizSpeaker {
        transition: transform 0.2s ease;
      }
      #audioQuizSpeaker:hover {
        transform: scale(1.1);
      }

      .speed-challenge-status {
        color: var(--text-secondary);
        font-weight: 600;
      }

      #speedChallengeOptions .article-btn {
        width: 80%;
        max-width: 400px;
        text-align: center;
        justify-content: center;
      }

      
      
      @media (max-width: 768px) {
        .container {
          padding: 12px;
        }
        .word-list th:nth-child(5),
        .word-list td:nth-child(5) {
          display: none;
        }
        .word-list th:first-child,
        .word-list td:first-child {
          width: 60px;
          text-align: center;
          padding-right: 0;
          padding-left: 0;
        }

        .word-checkbox {
          width: 18px;
          height: 18px;
          cursor: pointer;
        }

        .header {
          padding: 16px;
          margin-bottom: 16px;
        }

        .header h1 {
          font-size: 1.5rem;
        }

        .controls {
          flex-direction: column;
          align-items: stretch;
          gap: 8px;
        }

        .btn,
        .search-input {
          width: 100%;
          justify-content: center;
          font-size: 14px;
        }

        .toggle-group {
          width: 100%;
        }

        .toggle-btn {
          flex: 1;
        }

        .gender-legend {
          margin-top: 12px;
          font-size: 11px;
        }

        .flashcards-grid {
          grid-template-columns: 1fr;
          gap: 12px;
        }

        .flashcard {
          height: 160px;
        }

        .matching-game {
          grid-template-columns: 1fr;
          gap: 16px;
        }

        .word-list th,
        .word-list td {
          padding: 12px 12px;
          font-size: 13px;
        }

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

        .matching-column {
          padding: 12px;
        }

        .matching-item {
          padding: 12px 14px;
          font-size: 14px;
          min-height: 44px;
        }

        .sentence-practice {
          padding: 16px;
        }

        .practice-controls {
          flex-direction: column;
        }

        .practice-controls .btn {
          width: 100%;
        }

        .scramble-container {
          gap: 16px;
        }

        .word-bank,
        .answer-area {
          min-height: 70px;
          padding: 12px;
        }

        .article-options {
          flex-direction: column;
          align-items: center;
        }

        .article-btn {
          width: 200px;
        }

        .input-group {
          flex-direction: column;
          align-items: center;
        }

        .quiz-input {
          width: 250px;
        }
      }

      @media (max-width: 480px) {
        .container {
          padding: 8px;
        }

        .header {
          padding: 12px;
        }

        .header h1 {
          font-size: 1.3rem;
          margin-bottom: 12px;
        }

        .flashcard {
          height: 140px;
        }

        .flashcard-front,
        .flashcard-back {
          font-size: 1rem;
          padding: 16px;
        }

        .gender-legend {
          gap: 8px;
        }

        .legend-item {
          font-size: 10px;
        }

        .practice-word {
          font-size: 1.1rem;
          padding: 12px 16px;
        }

        .word-button {
          padding: 6px 12px;
          font-size: 13px;
          margin: 2px;
        }

        .word-display {
          font-size: 1.5rem;
        }

        .article-btn {
          padding: 10px 16px;
          width: 180px;
        }

        .pagination-controls {
          flex-wrap: wrap;
        }
      }

      
         .footer {
        text-align: center;
        padding: 24px 16px;
        margin-top: 24px;
        border-top: 1px solid var(--border-color);
      }

      .footer p {
        color: var(--text-secondary);
        font-size: 14px;
        opacity: 0.8;
      }
      .hidden {
        display: none !important;
      }

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

      .fade-in {
        animation: fadeIn 0.5s ease-in;
      }

      @keyframes fadeIn {
        from {
          opacity: 0;
          transform: translateY(20px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      
      @media (hover: none) and (pointer: coarse) {
        .btn:hover,
        .flashcard:hover .flashcard-inner,
        .matching-item:hover {
          transform: none;
        }

        .speaker-btn:hover {
          transform: none;
          background: var(--accent-color);
        }
      }

      
      .loading-spinner {
        display: inline-block;
        width: 16px;
        height: 16px;
        border: 2px solid var(--border-color);
        border-radius: 50%;
        border-top-color: var(--accent-color);
        animation: spin 1s ease-in-out infinite;
      }

      @keyframes spin {
        to {
          transform: rotate(360deg);
        }
      }

      
      .pulse {
        animation: pulse 2s infinite;
      }

      @keyframes pulse {
        0% {
          transform: scale(1);
        }
        50% {
          transform: scale(1.02);
        }
        100% {
          transform: scale(1);
        }
      }

      /* تنسيقات الترمومتر */
      .progress-container {
        margin: 16px 0;
        padding: 12px;
        background-color: var(--card-bg);
        border-radius: 8px;
        box-shadow: var(--shadow-light);
        border: 1px solid var(--border-color);
      }

      .progress-info {
        display: flex;
        justify-content: space-between;
        margin-bottom: 8px;
        font-size: 14px;
        color: var(--text-secondary);
      }

      .progress-bar {
        height: 12px;
        background-color: var(--border-color);
        border-radius: 6px;
        overflow: hidden;
      }

      .progress-fill {
        height: 100%;
        background: linear-gradient(90deg, var(--success-color), #38a169);
        border-radius: 6px;
        transition: width 0.5s ease;
        width: 0%;
      }