/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Lexend Deca', sans-serif;
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 50%, #333333 100%);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Authentication Modal */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 1rem;
}

.auth-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: 0 32px 64px rgba(0, 0, 0, 0.3);
    max-width: 420px;
    width: 100%;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.auth-header h2 {
    color: #2c3e50;
    margin-bottom: 0.75rem;
    font-size: 1.75rem;
    font-weight: 600;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-header p {
    color: #64748b;
    margin-bottom: 2rem;
    font-size: 0.95rem;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    color: #374151;
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    width: 100%;
    padding: 1rem;
    border: 2px solid rgba(148, 163, 184, 0.3);
    border-radius: 12px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    font-family: 'Lexend Deca', sans-serif;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.95);
    transform: translateY(-1px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.15);
}

.form-group input::placeholder {
    color: #94a3b8;
}

#authForm button[type="submit"] {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 0.5rem;
    font-family: 'Lexend Deca', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#authForm button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

#authForm button[type="submit"]:active {
    transform: translateY(0);
}

.auth-error {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 8px;
    border-left: 4px solid #ef4444;
    display: none;
}

.auth-footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(148, 163, 184, 0.2);
}

.auth-footer p {
    margin-bottom: 1rem;
    color: #64748b;
    font-size: 0.85rem;
}

.auth-footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.auth-footer a:hover {
    color: #764ba2;
}

.auth-content button {
    width: 100%;
    background: #3498db;
    color: white;
    border: none;
    padding: 12px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
    margin-bottom: 1rem;
}

.auth-content button:hover {
    background: #2980b9;
}

.auth-error {
    color: #e74c3c;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.auth-footer {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #ecf0f1;
}

.auth-footer a {
    color: #3498db;
    text-decoration: none;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* Book Selection Modal */
.book-selection-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 1rem;
}

.book-selection-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: 0 32px 64px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 100%;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideIn 0.5s ease-out;
}

.book-selection-header h2 {
    font-family: 'Fredoka', cursive;
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.book-selection-header p {
    color: #666;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.book-carousel {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.book-option {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 16px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    flex: 1;
    min-width: 280px;
    max-width: 320px;
}

.book-option:hover {
    transform: translateY(-5px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

.book-cover {
    width: 120px;
    height: 150px;
    margin: 0 auto 1rem;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-info h3 {
    font-family: 'Fredoka', cursive;
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.book-info p {
    color: #666;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.select-book-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.select-book-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.3);
}

.book-selection-footer {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding-top: 1.5rem;
}

.book-selection-footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.book-selection-footer a:hover {
    color: #764ba2;
}

@media (max-width: 768px) {
    .book-carousel {
        flex-direction: column;
        align-items: center;
    }
    
    .book-option {
        max-width: 100%;
    }
}

/* Reader Container */
.reader-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 50%, #333333 100%);
    position: relative;
}

/* Header */
.reader-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    gap: 1rem;
    flex-wrap: wrap;
}

.page-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(102, 126, 234, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    backdrop-filter: blur(10px);
}

#book-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #374151;
    margin: 0;
    flex: 1;
    min-width: 0;
}

.book-title-section {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 0;
}

#book-switcher-btn {
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    color: #667eea;
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
}

#book-switcher-btn:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-1px);
}

.header-controls button {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    font-family: 'Lexend Deca', sans-serif;
}

.header-controls button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.page-controls button {
    background: rgba(102, 126, 234, 0.2);
    color: #374151;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.page-controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

#page-indicator {
    color: #374151;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0 0.5rem;
}

/* Book Display */
.book-display {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    min-height: calc(100vh - 140px);
}

/* Book Pages */
.book-page {
    display: none;
    max-width: 1200px;
    width: 100%;
    min-height: 75vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow: 0 32px 64px rgba(0, 0, 0, 0.15);
    transition: all 0.4s ease;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.3);
    overflow: hidden;
}

.book-page.active {
    display: flex;
    opacity: 1;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.book-page.page-exit {
    animation: fadeOut 0.3s ease-in forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* Cover Page */
.cover-page {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    position: relative;
}

.cover-page::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="0.5" fill="%23667eea" opacity="0.1"/><circle cx="75" cy="75" r="0.5" fill="%23764ba2" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.cover-content {
    position: relative;
    z-index: 2;
    padding: 2rem;
}

.cover-content img {
    max-width: 280px;
    max-height: 350px;
    border-radius: 16px;
    margin-bottom: 2rem;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.cover-content img:hover {
    transform: scale(1.02);
}

.cover-content h2 {
    font-size: 2.25rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
    color: #374151;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cover-content p {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    color: #64748b;
    font-weight: 500;
}

.carousel-hint {
    font-size: 0.9rem !important;
    color: #94a3b8 !important;
    margin-top: 1rem !important;
    margin-bottom: 0 !important;
    font-style: italic;
}

/* Reading Mode Cover */
.reading-mode {
    padding: 2rem;
}

.reading-cover-only {
    max-width: 500px !important;
    max-height: 70vh !important;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6) !important;
    border-radius: 12px !important;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.reading-cover-only:hover {
    transform: scale(1.02) rotateY(2deg);
}

#start-reading {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 12px 35px rgba(16, 185, 129, 0.3);
    font-family: 'Lexend Deca', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#start-reading:hover {
    background: linear-gradient(135deg, #059669, #047857);
    transform: translateY(-3px);
    box-shadow: 0 16px 45px rgba(16, 185, 129, 0.4);
}

/* Story Pages (Text + Image) */
.story-page {
    padding: 1rem;
    gap: 1rem;
}

.page-left {
    flex: 0 0 35%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
}

.page-right {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.25rem;
}

.text-content {
    font-size: 1.49rem;
    line-height: 1.5;
    color: #ffffff;
    font-weight: 500;
    font-family: 'Fredoka', 'Lexend Deca', sans-serif;
    max-width: 400px;
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    border-left: 4px solid #ffffff;
    backdrop-filter: blur(10px);
    letter-spacing: 0.3px;
}

.image-content {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    aspect-ratio: 1;
    max-height: 70vh;
}

.image-content img {
    width: 100%;
    height: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
    object-fit: cover;
}

.image-content img:hover {
    transform: scale(1.01);
}

/* Text-only pages */
.text-only-page {
    padding: 3rem;
    justify-content: center;
    align-items: center;
}

.full-width-text {
    max-width: 800px;
    width: 100%;
}

.full-width-text .text-content {
    font-size: 1.1rem;
    line-height: 1.7;
    text-align: left;
    max-width: none;
}

/* The End Page */
.end-page {
    background: rgba(255, 255, 255, 0.98) !important;
    justify-content: center;
    align-items: center;
    text-align: center;
    flex-direction: column;
}

.end-page.active {
    display: flex !important;
    background: rgba(255, 255, 255, 0.98) !important;
}

.end-content {
    padding: 3rem;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.end-content h1 {
    font-size: 4rem;
    font-family: 'Fredoka', 'Lexend Deca', sans-serif;
    font-weight: 600;
    color: #2c3e50;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    letter-spacing: 2px;
    margin: 0;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Footer Controls */
.reader-footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1rem;
    position: sticky;
    bottom: 0;
    z-index: 100;
}

.footer-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.footer-controls button {
    background: rgba(102, 126, 234, 0.1);
    color: #374151;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Lexend Deca', sans-serif;
}

.footer-controls button:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-1px);
}

#page-slider {
    width: 300px;
    height: 6px;
    border-radius: 3px;
    background: rgba(102, 126, 234, 0.2);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

#page-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

#page-slider::-moz-range-thumb {
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    cursor: pointer;
    border: none;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.text-content {
    font-size: 1.6rem;
    line-height: 1.8;
    color: #2c3e50;
    text-align: left;
}

/* Text-Only Pages (Discussion/Educational) */
.text-only-page {
    padding: 4rem;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
}

.full-width-text {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.text-only-page .text-content {
    font-size: 1.2rem;
    line-height: 1.7;
}

/* Fullscreen Mode */
.reader-container.fullscreen-mode {
    background: #000000;
    padding: 2rem;
}

.reader-container.fullscreen-mode .book-display {
    padding: 1rem;
    min-height: calc(100vh - 4rem);
    display: flex;
    justify-content: center;
    align-items: center;
}

.reader-container.fullscreen-mode .book-page {
    max-width: 95vw;
    max-height: 90vh;
    width: auto;
    min-height: auto;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.reader-container.fullscreen-mode .story-page {
    padding: 2rem;
    max-height: 85vh;
}

.reader-container.fullscreen-mode .image-content {
    aspect-ratio: 1;
    max-height: 75vh;
}

.reader-container.fullscreen-mode .image-content img {
    max-height: 75vh;
    width: auto;
    object-fit: contain;
    border-radius: 8px;
}

.reader-container.fullscreen-mode .text-content {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
}

.reader-container.fullscreen-mode .reading-cover-only {
    max-width: 60vh !important;
    max-height: 80vh !important;
    width: auto !important;
    height: auto !important;
}

.reader-container.fullscreen-mode .end-page {
    max-width: 95vw;
    max-height: 90vh;
    width: 100%;
    height: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.reader-container.fullscreen-mode .end-content {
    padding: 4rem 3rem;
    max-height: 85vh;
    overflow-y: auto;
}

/* Fullscreen Progress Indicator */
.reader-container.fullscreen-mode::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(to right, #ffffff, #ffffff);
    z-index: 1000;
    width: calc(var(--progress) * 1%);
    transition: width 0.3s ease;
    opacity: 0.7;
}

.reader-container.fullscreen-mode::after {
    content: attr(data-page-info);
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.reader-container.fullscreen-mode:hover::after {
    opacity: 1;
}

/* Mobile Responsiveness */

/* Mobile - up to 767px */
@media (max-width: 767px) {
    .auth-content {
        padding: 2rem 1.5rem;
        margin: 1rem;
    }
    
    .auth-header h2 {
        font-size: 1.5rem;
    }
    
    .header-controls {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    #book-title {
        text-align: center;
        font-size: 1.1rem;
    }
    
    .page-controls {
        justify-content: center;
        order: 2;
    }
    
    .header-controls button {
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
    }
    
    .book-display {
        padding: 0.5rem;
        min-height: calc(100vh - 200px);
    }
    
    .book-page {
        min-height: auto;
        border-radius: 16px;
    }
    
    .story-page {
        flex-direction: column;
        padding: 1.5rem;
        gap: 1.5rem;
    }
    
    .page-left, .page-right {
        flex: none;
        padding: 0;
    }
    
    .text-content {
        font-size: 1.28rem;
        line-height: 1.5;
        padding: 1.5rem;
        margin-bottom: 1rem;
        font-family: 'Fredoka', 'Lexend Deca', sans-serif;
        font-weight: 500;
    }
    
    .image-content img {
        max-height: 250px;
    }
    
    .cover-content img {
        max-width: 200px;
        max-height: 250px;
    }
    
    .cover-content h2 {
        font-size: 1.75rem;
    }
    
    .cover-content p {
        font-size: 1rem;
    }
    
    #start-reading {
        padding: 0.875rem 2rem;
        font-size: 1rem;
    }
    
    .end-content h1 {
        font-size: 2.5rem;
    }
    
    .footer-controls {
        flex-direction: column;
        gap: 1rem;
    }
    
    #page-slider {
        width: 100%;
        max-width: 250px;
    }
}

/* Tablet - 768px to 1023px */
@media (min-width: 768px) and (max-width: 1023px) {
    .header-controls {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    #book-title {
        flex: 100%;
        text-align: center;
        margin-bottom: 0.5rem;
    }
    
    .story-page {
        padding: 2rem;
    }
    
    .text-content {
        font-size: 1.36rem;
        padding: 1.75rem;
        font-family: 'Fredoka', 'Lexend Deca', sans-serif;
        font-weight: 500;
    }
    
    .end-content h1 {
        font-size: 3.5rem;
    }
    
    .footer-controls {
        gap: 1.5rem;
    }
    
    #page-slider {
        width: 250px;
    }
}

/* Large screens - 1024px and up */
@media (min-width: 1024px) {
    .book-page {
        max-width: 1200px;
    }
    
    .story-page {
        padding: 3rem;
    }
    
    .text-content {
        font-size: 1.62rem;
        padding: 2.5rem;
        font-family: 'Fredoka', 'Lexend Deca', sans-serif;
        font-weight: 500;
    }
    
    .cover-content img {
        max-width: 320px;
        max-height: 400px;
    }
    
    .cover-content h2 {
        font-size: 2.5rem;
    }
    
    .end-content h1 {
        font-size: 5rem;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .header-controls button, 
    .footer-controls button,
    #start-reading {
        min-height: 44px;
        min-width: 44px;
    }
    
    .page-controls button {
        padding: 0.75rem 1rem;
    }
    
    #page-slider {
        height: 8px;
    }
    
    #page-slider::-webkit-slider-thumb {
        height: 24px;
        width: 24px;
    }
    
    #page-slider::-moz-range-thumb {
        height: 24px;
        width: 24px;
    }
}

/* Landscape phone orientation */
@media (max-width: 767px) and (orientation: landscape) {
    .book-display {
        min-height: calc(100vh - 160px);
    }
    
    .story-page {
        flex-direction: row;
        gap: 1rem;
        padding: 1rem;
    }
    
    .text-content {
        font-size: 1rem;
        padding: 1rem;
    }
    
    .image-content img {
        max-height: 200px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .book-page {
        box-shadow: 0 32px 64px rgba(0, 0, 0, 0.12);
    }
    
    .header-controls button:hover,
    .footer-controls button:hover {
        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.25);
    }
}

#page-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #3498db;
    border-radius: 50%;
    cursor: pointer;
}

#page-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #3498db;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* Buttons */
button {
    background: #3498db;
    color: white;
    border: none;
    padding: 0.7rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
    font-weight: 500;
}

button:hover {
    background: #2980b9;
    transform: translateY(-1px);
}

button:disabled {
    background: #95a5a6;
    cursor: not-allowed;
    transform: none;
}

#logout-btn {
    background: #e74c3c;
}

#logout-btn:hover {
    background: #c0392b;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-controls {
        flex-direction: column;
        gap: 1rem;
    }
    
    .story-page {
        flex-direction: column;
        padding: 2rem;
    }
    
    .page-left {
        padding-right: 0;
        padding-bottom: 2rem;
        flex: none;
    }
    
    .page-right {
        flex: none;
    }
    
    .text-content {
        font-size: 1.2rem;
    }
    
    .footer-controls {
        flex-direction: column;
        gap: 1rem;
    }
    
    #page-slider {
        margin: 0;
        width: 100%;
    }
}

/* Discussion Mode Styles */
.discussion-mode .text-content {
    font-size: 1.8rem;
    line-height: 2;
}

.discussion-mode .page-right {
    opacity: 0.7;
}

/* Loading Animation */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.loading::after {
    content: "";
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Audio Controls */
.audio-controls {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
}

.audio-toggle {
    background-color: #28a745;
    color: #fff;
    border: none;
    padding: 12px 16px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

.audio-toggle:hover {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
}

.audio-toggle.active {
    background-color: #dc3545;
}

.audio-toggle.active:hover {
    background-color: #c82333;
}