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

html {
    height: 100%;
    width: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    color: #2c3e50;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo i {
    color: #8e44ad;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #8e44ad;
}

.reading-list-btn {
    background: #8e44ad;
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: background 0.3s ease;
}

.reading-list-btn:hover {
    background: #7d3c98;
}

.login-btn {
    background: #3498db;
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: background 0.3s ease;
}

.login-btn:hover {
    background: #2980b9;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-container {
    display: flex;
    max-width: 500px;
    margin: 0 auto 2rem;
    background: white;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.search-container input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    font-size: 1rem;
    outline: none;
    color: #333;
}

.search-container button {
    background: #8e44ad;
    color: white;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.search-container button:hover {
    background: #7d3c98;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.cta-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
}

.cta-btn.secondary {
    background: transparent;
    border: 2px solid white;
}

.cta-btn.secondary:hover {
    background: white;
    color: #8e44ad;
}

/* Featured Books */
.featured-books {
    padding: 80px 0;
    background: #f8f9fa;
}

.featured-books h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.books-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.book-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    display: flex;
    padding: 1.5rem;
    gap: 1rem;
}

.book-card:hover {
    transform: translateY(-5px);
}

.book-card img {
    width: 80px;
    height: 120px;
    object-fit: cover;
    border-radius: 8px;
    flex-shrink: 0;
}

.book-info {
    flex: 1;
}

.book-info h3 {
    font-size: 1.2rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.book-info .author {
    color: #8e44ad;
    font-weight: 500;
    margin-bottom: 0.3rem;
}

.book-info .genre {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.rating {
    color: #f39c12;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.read-btn {
    background: #27ae60;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.3s ease;
}

.read-btn:hover {
    background: #229954;
}

/* Library Section */
.library {
    padding: 80px 0;
    background: white;
}

.library h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.library-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.library-filters select,
.library-filters input {
    padding: 0.7rem 1rem;
    border: 2px solid #ddd;
    border-radius: 25px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.library-filters select:focus,
.library-filters input:focus {
    border-color: #8e44ad;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 2rem;
}

.book-card.grid-item {
    flex-direction: column;
    text-align: center;
    padding: 1rem;
}

.book-card.grid-item img {
    width: 100%;
    height: 250px;
    margin-bottom: 1rem;
}

/* Categories Section */
.categories {
    padding: 80px 0;
    background: #f8f9fa;
}

.categories h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.category-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-5px);
}

.category-card i {
    font-size: 3rem;
    color: #8e44ad;
    margin-bottom: 1rem;
}

.category-card h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.category-card p {
    color: #666;
    font-size: 1.1rem;
}

/* About Section */
.about {
    padding: 80px 0;
    background: white;
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #666;
}

.platform-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.feature h4 {
    color: #8e44ad;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feature i {
    color: #8e44ad;
}

.feature p {
    color: #666;
    margin-bottom: 0;
}

.about-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 15px;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background: #f8f9fa;
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

.contact-item {
    margin-bottom: 1.5rem;
}

.contact-item h4 {
    color: #8e44ad;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-item p {
    color: #666;
}

.contact-form h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

.contact-form input,
.contact-form textarea,
.contact-form select {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
    border-color: #8e44ad;
}

.contact-form button {
    background: #8e44ad;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background 0.3s ease;
}

.contact-form button:hover {
    background: #7d3c98;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 30px;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 20px;
    top: 15px;
}

.close:hover {
    color: #333;
}

/* Reading List Modal */
.reading-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #eee;
    background: #f8f9fa;
    margin-bottom: 0.5rem;
    border-radius: 8px;
}

.reading-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

.reading-actions button {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

#clear-list {
    background: #e74c3c;
    color: white;
}

#clear-list:hover {
    background: #c0392b;
}

#start-reading {
    background: #27ae60;
    color: white;
}

#start-reading:hover {
    background: #229954;
}

/* Login Modal */
.auth-tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 2px solid #eee;
}

.tab-btn {
    flex: 1;
    padding: 1rem;
    border: none;
    background: none;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tab-btn.active {
    color: #8e44ad;
    border-bottom: 2px solid #8e44ad;
}

.auth-tab {
    display: none;
}

.auth-tab.active {
    display: block;
}

.auth-tab input {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.auth-tab input:focus {
    border-color: #8e44ad;
}

.auth-tab button[type="submit"] {
    width: 100%;
    background: #8e44ad;
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: background 0.3s ease;
}

.auth-tab button[type="submit"]:hover {
    background: #7d3c98;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.social-login {
    margin-top: 1rem;
}

.social-btn {
    width: 100%;
    padding: 1rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    background: white;
    cursor: pointer;
    margin-bottom: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.social-btn:hover {
    border-color: #8e44ad;
}

.social-btn.google:hover {
    background: #f8f9fa;
}

.social-btn.facebook:hover {
    background: #f0f2f5;
}

/* E-book Reader Modal */
.reader-modal .modal-content {
    width: 95%;
    max-width: 1000px;
    height: 90vh;
    max-height: none;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.reader-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.reader-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: #f8f9fa;
    border-bottom: 1px solid #ddd;
}

.reader-controls {
    display: flex;
    gap: 0.5rem;
}

.reader-controls button {
    padding: 0.5rem;
    border: none;
    background: #8e44ad;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.reader-controls button:hover {
    background: #7d3c98;
}

.reader-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    font-size: 1.1rem;
    line-height: 1.8;
    background: white;
}

.reader-footer {
    padding: 1rem 2rem;
    background: #f8f9fa;
    border-top: 1px solid #ddd;
}

.reading-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: #ddd;
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: #8e44ad;
    transition: width 0.3s ease;
}

/* Reviews Section */
.reviews {
    padding: 80px 0;
    background: white;
}

.reviews h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.review {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.stars {
    color: #f39c12;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.review p {
    font-style: italic;
    margin-bottom: 1rem;
    color: #666;
    font-size: 1.1rem;
}

.review span {
    font-weight: 600;
    color: #2c3e50;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #34495e;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.social-links a:hover {
    background: #8e44ad;
}

.newsletter {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.newsletter input {
    flex: 1;
    padding: 0.8rem;
    border: none;
    border-radius: 5px;
}

.newsletter button {
    background: #8e44ad;
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s ease;
}

.newsletter button:hover {
    background: #7d3c98;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .search-container {
        flex-direction: column;
        border-radius: 15px;
    }
    
    .search-container button {
        border-radius: 0 0 15px 15px;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .newsletter {
        flex-direction: column;
    }
    
    .library-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .books-slider {
        grid-template-columns: 1fr;
    }
    
    .book-card {
        flex-direction: column;
        text-align: center;
    }
    
    .book-card img {
        width: 120px;
        height: 180px;
        margin: 0 auto 1rem;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
    
    .reader-modal .modal-content {
        height: 95vh;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
}

/* Dark theme for reader */
.reader-content.dark {
    background: #2c3e50;
    color: #ecf0f1;
}

.reader-content.dark .reader-header,
.reader-content.dark .reader-footer {
    background: #34495e;
    color: #ecf0f1;
}