/* Base Styles & Variables */
:root {
    --primary: #6c5ce7;
    --primary-dark: #5649c0;
    --primary-light: #a29bfe;
    --secondary: #00cec9;
    --secondary-dark: #00a8a5;
    --secondary-light: #81ecec;
    --accent: #fd79a8;
    --accent-dark: #e84393;
    --accent-light: #ff9ff3;
    --success: #00b894;
    --success-dark: #008c6d;
    --warning: #fdcb6e;
    --warning-dark: #f39c12;
    --danger: #d63031;
    --danger-dark: #c0392b;
    --dark: #2d3436;
    --dark-light: #636e72;
    --light: #f5f6fa;
    --light-dark: #dfe6e9;
    --gray: #b2bec3;
    --gray-light: #ecf0f1;
    --white: #ffffff;
    --black: #000000;
}

.dark-mode {
    --bg-color: #1a1a2e;
    --bg-secondary: #16213e;
    --text-color: #f1f1f1;
    --text-secondary: #d1d1d1;
    --card-bg: #16213e;
    --card-hover: #1e2a5a;
    --border-color: #2a2a4a;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --overlay-color: rgba(0, 0, 0, 0.7);
    --input-bg: #0f1120;
    --input-border: #3a3a5a;
}

.light-mode {
    --bg-color: #f8f9fa;
    --bg-secondary: #ffffff;
    --text-color: #333333;
    --text-secondary: #666666;
    --card-bg: #ffffff;
    --card-hover: #f1f3f5;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --overlay-color: rgba(255, 255, 255, 0.7);
    --input-bg: #ffffff;
    --input-border: #d1d1d1;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background-color: transparent;
    border: none;
    outline: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 206, 201, 0.3);
}

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
    background-color: transparent;
}

.btn-outline:hover {
    background-color: var(--primary);
    color: var(--white);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Floating Navigation */
.floating-nav {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(var(--card-bg), 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 50px;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 90%;
    max-width: 1200px;
    z-index: 1000;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    height: 32px;
    width: auto;
}

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    font-weight: 500;
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: var(--white);
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--bg-secondary);
    z-index: 1100;
    padding: 20px;
    transition: right 0.3s ease;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.close-mobile-menu {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
}

.mobile-menu-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
    flex: 1;
}

.mobile-menu-link {
    padding: 12px 0;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.mobile-menu-link i {
    width: 20px;
    text-align: center;
}

.mobile-menu-link.active {
    color: var(--primary);
}

.mobile-menu-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 15px 0;
}

.mobile-menu-footer {
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

/* Main Content */
.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 20px 60px;
    min-height: 100vh;
}

/* Hero Section */
.hero-section {
    display: flex;
    align-items: center;
    min-height: calc(100vh - 160px);
    padding: 40px 0;
    position: relative;
}

.hero-content {
    flex: 1;
    padding-right: 40px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: 20px;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.floating-book {
    position: relative;
    width: 300px;
    height: 400px;
    perspective: 1000px;
}

.book-cover {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 5px 15px 15px 5px;
    transform-style: preserve-3d;
    transform: rotateY(-10deg);
    transition: transform 0.5s ease;
    box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 40px;
    color: white;
    z-index: 2;
}

.book-spine {
    position: absolute;
    left: 0;
    top: 10%;
    width: 15px;
    height: 80%;
    background: linear-gradient(90deg, var(--primary-dark), var(--primary));
    transform: rotateY(90deg) translateX(-15px);
}

.book-title {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 10px;
}

.book-author {
    font-size: 1rem;
    opacity: 0.8;
}

.book-pages {
    position: absolute;
    width: 95%;
    height: 98%;
    background-color: var(--light);
    border-radius: 5px 15px 15px 5px;
    transform: translateX(10px) rotateY(-20deg);
    box-shadow: 5px 5px 20px rgba(0, 0, 0, 0.1);
    z-index: 1;
}

/* Features Section */
.features-section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-secondary);
}

/* Testimonials Section */
.testimonials-section {
    padding: 80px 0;
}

.testimonials-slider {
    display: flex;
    gap: 30px;
    overflow-x: auto;
    padding: 20px 0;
    scroll-snap-type: x mandatory;
}

.testimonial-card {
    min-width: 350px;
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    border: 1px solid var(--border-color);
    scroll-snap-align: start;
}

.testimonial-content {
    font-size: 1.125rem;
    font-style: italic;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.testimonial-author img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-weight: 600;
}

.author-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* CTA Section */
.cta-section {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 20px;
    margin: 40px 0;
    color: white;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Footer */
.main-footer {
    background-color: var(--bg-secondary);
    padding: 60px 0 20px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer-brand .logo-icon {
    height: 40px;
}

.footer-brand p {
    color: var(--text-secondary);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
}

.link-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.link-group h4 {
    font-size: 1.125rem;
    margin-bottom: 10px;
    color: var(--primary);
}

.link-group a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.link-group a:hover {
    color: var(--primary);
}

.link-group a i {
    margin-right: 8px;
    width: 20px;
    text-align: center;
}

.footer-bottom {
    max-width: 1200px;
    margin: 40px auto 0;
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-bottom a {
    color: var(--primary);
}

/* Library Page Styles */
.library-wrapper {
    padding-top: 40px;
}

.library-header {
    margin-bottom: 40px;
}

.library-header h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.library-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.search-bar {
    position: relative;
    flex: 1;
    min-width: 250px;
    max-width: 400px;
}

.search-bar input {
    width: 100%;
    padding: 12px 20px 12px 45px;
    border-radius: 50px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.search-bar input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.2);
}

.search-bar i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.filter-controls {
    display: flex;
    gap: 15px;
}

.filter-controls select {
    padding: 12px 20px;
    border-radius: 50px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 15px;
    padding-right: 40px;
}

.filter-controls select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.2);
}

.book-grid-container {
    position: relative;
    min-height: 300px;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.book-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.book-cover-preview {
    height: 200px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    color: white;
    position: relative;
    overflow: hidden;
}

.book-cover-preview::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
}

.book-cover-preview h4 {
    font-size: 1.25rem;
    margin-bottom: 5px;
    z-index: 1;
    line-height: 1.3;
}

.book-cover-preview p {
    font-size: 0.875rem;
    opacity: 0.9;
    z-index: 1;
}

.book-info {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    flex: 1;
}

.category-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--primary-light);
    color: var(--primary-dark);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.progress-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 3px;
    transition: width 0.5s ease;
}

.progress-container span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    align-self: flex-end;
}

/* Loading Spinner */
.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-spinner p {
    color: var(--text-secondary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-color);
    backdrop-filter: blur(5px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 12px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow: auto;
    padding: 30px;
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.close-modal:hover {
    color: var(--primary);
}

/* Quick View Content */
.quick-view-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
}

.quick-view-cover {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 10px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    color: white;
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

.quick-view-cover::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
}

.quick-view-cover h3 {
    font-size: 1.75rem;
    margin-bottom: 10px;
    z-index: 1;
    line-height: 1.3;
}

.quick-view-cover p {
    font-size: 1rem;
    opacity: 0.9;
    z-index: 1;
}

.quick-view-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.quick-view-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 10px;
}

.quick-view-meta span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.quick-view-meta i {
    font-size: 0.75rem;
}

.quick-view-description {
    line-height: 1.7;
    color: var(--text-secondary);
}

.quick-view-actions {
    display: flex;
    gap: 15px;
    margin-top: auto;
}

/* User Dropdown */
.user-dropdown {
    position: relative;
}

.user-avatar {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 50px;
    transition: background-color 0.3s ease;
}

.user-avatar:hover {
    background-color: var(--border-color);
}

.user-avatar img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-avatar i {
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 10px 0;
    min-width: 200px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.dropdown-menu a:hover {
    background-color: var(--border-color);
    color: var(--primary);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 10px 0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.8rem;
    }
    
    .quick-view-content {
        grid-template-columns: 1fr;
    }
    
    .quick-view-cover {
        min-height: 300px;
    }
}

@media (max-width: 768px) {
    .floating-nav {
        padding: 10px 15px;
    }
    
    .nav-links, .nav-actions {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-section {
        flex-direction: column;
        text-align: center;
        padding-top: 80px;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: 40px;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .floating-book {
        width: 250px;
        height: 350px;
    }
    
    .library-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-bar {
        max-width: 100%;
    }
    
    .filter-controls {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: 15px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .modal-content {
        width: 95%;
        padding: 20px;
    }
    
    .quick-view-actions {
        flex-direction: column;
    }
    
    .quick-view-actions .btn {
        width: 100%;
    }
}