/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: #1d1d1f;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 32px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.2);
    letter-spacing: -0.02em;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* Setup Panel */
.setup-panel {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 40px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
}

.setup-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6), transparent);
}

.setup-form h2 {
    text-align: center;
    margin-bottom: 32px;
    color: #1d1d1f;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #1d1d1f;
    font-size: 0.95rem;
}

.form-group select,
.form-group input {
    width: 100%;
    padding: 16px 20px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 16px;
    font-size: 16px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: #007AFF;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 
        0 0 0 4px rgba(0, 122, 255, 0.1),
        0 4px 12px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    transform: translateY(-1px);
}

.verse-range-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.verse-range-container input {
    flex: 1;
}

.verse-range-container span {
    font-weight: 500;
    color: #718096;
}

.help-text {
    color: #718096;
    font-size: 0.9rem;
    margin-top: 5px;
}

/* Buttons */
.btn {
    padding: 16px 24px;
    border: none;
    border-radius: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-block;
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.btn-primary {
    background: rgba(0, 122, 255, 0.9);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 4px 20px rgba(0, 122, 255, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
    background: rgba(0, 122, 255, 1);
    transform: translateY(-2px);
    box-shadow: 
        0 8px 25px rgba(0, 122, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 
        0 2px 10px rgba(0, 122, 255, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.7);
    color: #1d1d1f;
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.btn-success {
    background: #48bb78;
    color: white;
}

.btn-success:hover {
    background: #38a169;
    transform: translateY(-1px);
}

.btn-warning {
    background: #ed8936;
    color: white;
}

.btn-warning:hover {
    background: #dd6b20;
    transform: translateY(-1px);
}

.btn-danger {
    background: #f56565;
    color: white;
}

.btn-danger:hover {
    background: #e53e3e;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.5);
}

#startStudyBtn {
    width: 100%;
    padding: 16px;
    font-size: 18px;
    margin-top: 20px;
}

/* Flashcard Container */
.flashcard-container {
    max-width: 800px;
    margin: 0 auto;
}

/* Keyboard Guide */
.keyboard-guide {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 20px;
    margin-bottom: 20px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.guide-toggle {
    padding: 16px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
}

.guide-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.toggle-icon {
    transition: transform 0.3s ease;
    font-size: 0.8rem;
}

.keyboard-guide.expanded .toggle-icon {
    transform: rotate(180deg);
}

.guide-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: rgba(255,255,255,0.05);
}

.keyboard-guide.expanded .guide-content {
    max-height: 200px;
}

.guide-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    color: white;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.guide-item:last-child {
    border-bottom: none;
}

.guide-item span:last-child {
    font-size: 0.9rem;
    opacity: 0.9;
}

kbd {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 6px 10px;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    color: white;
    margin: 0 3px;
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    display: inline-block;
    min-width: 28px;
    text-align: center;
}

/* Progress Bar */
.progress-bar {
    background: rgba(255,255,255,0.2);
    border-radius: 25px;
    padding: 4px;
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
}

.progress-fill {
    background: linear-gradient(90deg, #48bb78, #38a169);
    height: 20px;
    border-radius: 20px;
    transition: width 0.5s ease;
    width: 0%;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: 600;
    font-size: 14px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

/* Flashcard */
.flashcard {
    perspective: 1000px;
    margin-bottom: 30px;
    position: relative;
    min-height: 400px;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    min-height: 400px;
    height: auto;
    text-align: center;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

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

.flashcard-front,
.flashcard-back {
    width: 100%;
    min-height: 400px;
    height: auto;
    backface-visibility: hidden;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    display: flex;
    flex-direction: column;
    padding: 32px;
    position: relative;
    overflow: hidden;
}

.flashcard-front::before,
.flashcard-back::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6), transparent);
}

.flashcard-back {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotateY(180deg);
}

.flashcard.flipped .flashcard-front {
    visibility: hidden;
}

.flashcard:not(.flipped) .flashcard-back {
    visibility: hidden;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f7fafc;
    flex-shrink: 0;
}

.verse-location {
    font-weight: 600;
    color: #667eea;
    font-size: 1.1rem;
}

.card-type {
    background: #667eea;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.card-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px 0;
    min-height: 200px;
}

.question-text {
    font-size: clamp(1.2rem, 4vw, 1.8rem);
    line-height: 1.6;
    color: #2d3748;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
    max-width: 100%;
}

.question-text.arabic {
    font-family: 'Amiri', serif;
    font-size: clamp(1.4rem, 5vw, 2.2rem);
    line-height: 1.8;
    direction: rtl;
    text-align: center;
}

.answer-section {
    width: 100%;
    max-width: 100%;
}

.arabic-text {
    font-family: 'Amiri', serif;
    font-size: clamp(1.4rem, 5vw, 2.2rem);
    line-height: 1.8;
    color: #2d3748;
    margin-bottom: 20px;
    direction: rtl;
    text-align: center;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

.translation-text {
    font-size: clamp(1rem, 3vw, 1.4rem);
    line-height: 1.6;
    color: #4a5568;
    font-style: italic;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
    max-width: 100%;
}

.reveal-btn {
    margin-top: 20px;
    align-self: center;
    min-width: 150px;
    flex-shrink: 0;
}

.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.action-buttons .btn {
    flex: 1;
    max-width: 120px;
    min-width: 100px;
}

/* Study Controls */
.study-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.study-controls .btn {
    min-width: 120px;
}

/* Results Panel */
.results-panel {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.results-panel h2 {
    color: #4a5568;
    margin-bottom: 30px;
    font-size: 2rem;
}

.results-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 30px;
    gap: 20px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 1.1rem;
    color: #718096;
    font-weight: 500;
}

.results-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.results-actions .btn {
    min-width: 180px;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    font-size: 1.2rem;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .setup-panel {
        padding: 25px;
    }
    
    /* Hide keyboard guide on mobile */
    .keyboard-guide {
        display: none;
    }
    
    .flashcard {
        min-height: 350px;
    }
    
    .flashcard-inner {
        min-height: 350px;
    }
    
    .flashcard-front,
    .flashcard-back {
        padding: 20px;
        min-height: 350px;
    }
    
    .card-content {
        min-height: 180px;
        padding: 15px 0;
    }
    
    .arabic-text {
        font-size: clamp(1.2rem, 6vw, 1.8rem);
    }
    
    .translation-text {
        font-size: clamp(0.9rem, 4vw, 1.2rem);
    }
    
    .question-text {
        font-size: clamp(1rem, 5vw, 1.5rem);
    }
    
    .verse-range-container {
        flex-direction: column;
        gap: 10px;
    }
    
    .verse-range-container span {
        order: -1;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        max-width: none;
    }
    
    .study-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .study-controls .btn {
        width: 100%;
        max-width: 200px;
    }
    
    .results-stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .results-actions {
        flex-direction: column;
    }
    
    .results-actions .btn {
        width: 100%;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .setup-panel {
        padding: 20px;
    }
    
    /* Ensure keyboard guide stays hidden on small mobile */
    .keyboard-guide {
        display: none;
    }
    
    .flashcard {
        min-height: 300px;
    }
    
    .flashcard-inner {
        min-height: 300px;
    }
    
    .flashcard-front,
    .flashcard-back {
        min-height: 300px;
    }
    
    .card-content {
        min-height: 150px;
        padding: 10px 0;
    }
    
    .arabic-text {
        font-size: clamp(1.1rem, 7vw, 1.6rem);
    }
    
    .translation-text {
        font-size: clamp(0.85rem, 5vw, 1.1rem);
    }
    
    .question-text {
        font-size: clamp(0.95rem, 6vw, 1.3rem);
    }
}

/* Animation for card transitions */
.flashcard-inner {
    animation: slideIn 0.5s ease-out;
}

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

/* Hover effects */
.flashcard:hover .flashcard-inner {
    box-shadow: 0 25px 50px rgba(0,0,0,0.15);
}

/* Focus styles for accessibility */
.btn:focus,
select:focus,
input:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn-primary {
        background: #000;
        border: 2px solid #fff;
    }
    
    .card-type {
        background: #000;
        border: 1px solid #fff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .flashcard-inner {
        transition: none;
    }
    
    .btn {
        transition: none;
    }
    
    .loading-spinner {
        animation: none;
    }
}