/* Mobile responsive styles */
@media (max-width: 768px) {
    .flashcard-container { 
        padding: 30px 20px; 
        margin: 15px 10px;
        max-width: 95%;
    }
    
    .header h1 {
        font-size: 24px;
        padding-left: 50px;
    }
    
    .japanese-word { 
        font-size: 36px; 
    }
    
    .quiz-question {
        font-size: 28px;
    }
    
    .quiz-question.kanji-focus {
        font-size: 56px;
    }
    
    .quiz-question.speed-challenge {
        font-size: 42px;
    }
    
    .quiz-question.listening-mode {
        font-size: 18px;
    }

    .learning-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .quiz-mode-selector {
        gap: 6px;
    }

    .quiz-mode-btn, .reading-toggle-btn, .info-btn {
        font-size: 11px;
        padding: 6px 12px;
    }
    
    .tab-button {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .controls { 
        flex-direction: column; 
        align-items: center; 
        gap: 10px;
    }
    
    .btn { 
        width: 100%; 
        max-width: 250px; 
    }
    
    .footer-actions {
        flex-direction: column;
        gap: 10px;
    }
    
    .footer-btn {
        width: 100%;
        max-width: 250px;
    }
}

@media (max-width: 480px) {
    .flashcard-container { 
        padding: 20px 15px; 
        margin: 10px 5px;
    }
    
    .header h1 {
        font-size: 20px;
        padding-left: 45px;
        margin-bottom: 15px;
    }
    
    .japanese-word { 
        font-size: 28px; 
    }
    
    .quiz-question {
        font-size: 24px;
    }
    
    .quiz-question.kanji-focus {
        font-size: 48px;
    }
    
    .quiz-question.speed-challenge {
        font-size: 36px;
    }
    
    .quiz-question.listening-mode {
        font-size: 16px;
    }
    
    .meaning {
        font-size: 20px;
    }
    
    .reading {
        font-size: 16px;
    }
    
    .flashcard {
        min-height: 180px;
        padding: 30px 15px;
    }
    
    .quiz-container {
        padding: 20px 15px;
    }
    
    .quiz-options {
        gap: 12px;
    }
    
    .quiz-option {
        padding: 12px 15px;
        font-size: 14px;
    }
    
    .quiz-mode-btn, .reading-toggle-btn, .info-btn {
        font-size: 10px;
        padding: 5px 10px;
    }
    
    .hamburger-menu {
        width: 35px;
        height: 35px;
    }
    
    .audio-button {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .quiz-audio-button {
        width: 60px;
        height: 60px;
        font-size: 20px;
    }
    
    .modal-content {
        padding: 20px;
        margin: 20px;
        max-width: calc(100vw - 40px);
    }
    
    .btn {
        font-size: 14px;
        padding: 10px 20px;
    }
    
    .stats {
        padding: 15px;
    }
    
    .learning-overview {
        padding: 10px;
        gap: 8px;
    }
    
    .learning-stat {
        padding: 8px;
    }
    
    .learning-stat-number {
        font-size: 20px;
    }
    
    .card-info {
        font-size: 12px;
    }
    
    .speed-timer {
        top: 5px;
        right: 5px;
        padding: 3px 10px;
        font-size: 12px;
    }
}

/* Landscape orientation adjustments */
@media (max-height: 600px) and (orientation: landscape) {
    .flashcard-container {
        max-height: 90vh;
        overflow-y: auto;
        margin: 5vh auto;
    }
    
    .flashcard {
        min-height: 150px;
        padding: 20px 15px;
    }
    
    .japanese-word {
        font-size: 32px;
    }
    
    .quiz-question {
        font-size: 24px;
        margin-bottom: 15px;
    }
    
    .header h1 {
        font-size: 22px;
        margin-bottom: 15px;
    }
}

/* High DPI / Retina display optimizations */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .japanese-word, .quiz-question {
        text-rendering: optimizeLegibility;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    
    .hamburger-icon span, 
    .toggle-slider:before,
    .learning-state-indicator {
        -webkit-backface-visibility: hidden;
        backface-visibility: hidden;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .pulse, .spin {
        animation: none !important;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .modal-content,
    .dropdown-menu,
    .quiz-option,
    .stats,
    .learning-overview {
        background: #2d2d2d;
        color: #e0e0e0;
        border-color: #555;
    }
    
    .form-input,
    .form-textarea {
        background: #333;
        color: #e0e0e0;
        border-color: rgba(56, 142, 60, 0.4);
    }
    
    .quiz-option:hover:not(.disabled) {
        background: #3d3d3d;
        border-color: #388e3c;
    }
}

/* Print styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .flashcard-container {
        box-shadow: none;
        border: 1px solid #ccc;
        background: white;
    }
    
    .audio-button,
    .hamburger-menu,
    .controls,
    .footer-actions {
        display: none;
    }
    
    .quiz-options {
        page-break-inside: avoid;
    }
}