/* Base Styles */
:root {
    /* Light Theme */
    --light-bg: #f8fafc;
    --light-surface: #ffffff;
    --light-text: #0f172a;
    --light-text-secondary: #475569;
    --light-border: #e2e8f0;
    --light-card: #ffffff;
    --light-hover: #f1f5f9;
    
    /* Dark Theme */
    --dark-bg: #0f172a;
    --dark-surface: #1e293b;
    --dark-text: #f1f5f9;
    --dark-text-secondary: #cbd5e1;
    --dark-border: #334155;
    --dark-card: #1e293b;
    --dark-hover: #2d3a4f;
    
    /* Common Colors */
    --primary: #8b5cf6;
    --primary-light: #a78bfa;
    --primary-dark: #7c3aed;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #8b5cf6, #a78bfa);
    --gradient-success: linear-gradient(135deg, #10b981, #34d399);
    --gradient-danger: linear-gradient(135deg, #ef4444, #f87171);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    
    /* Glass Effect */
    --glass-light: rgba(255, 255, 255, 0.25);
    --glass-dark: rgba(15, 23, 42, 0.7);
    --glass-border: rgba(255, 255, 255, 0.18);
    
    /* Animations */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Theme Variables */
.light-mode {
    --bg-color: var(--light-bg);
    --surface-color: var(--light-surface);
    --text-color: var(--light-text);
    --text-secondary: var(--light-text-secondary);
    --border-color: var(--light-border);
    --card-bg: var(--light-card);
    --hover-color: var(--light-hover);
    --glass-bg: var(--glass-light);
    --shadow-color: rgba(0, 0, 0, 0.1);
}

.dark-mode {
    --bg-color: var(--dark-bg);
    --surface-color: var(--dark-surface);
    --text-color: var(--dark-text);
    --text-secondary: var(--dark-text-secondary);
    --border-color: var(--dark-border);
    --card-bg: var(--dark-card);
    --hover-color: var(--dark-hover);
    --glass-bg: var(--glass-dark);
    --shadow-color: rgba(0, 0, 0, 0.3);
}

/* Global Styles */
* {
    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 var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Loading Animation */
.loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loader-wrapper.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.circle {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    animation: bounce 0.5s alternate infinite;
}

.circle:nth-child(2) {
    animation-delay: 0.1s;
    background: var(--primary-light);
}

.circle:nth-child(3) {
    animation-delay: 0.2s;
    background: var(--primary-dark);
}

@keyframes bounce {
    to {
        transform: translateY(-20px);
    }
}

.loading-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.logo i {
    color: var(--primary);
    font-size: 2rem;
    animation: float 3s infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.highlight {
    color: var(--primary);
}

/* Navigation */
.nav-menu {
    flex: 1;
    display: flex;
    justify-content: center;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

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

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

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

/* Nav Right */
.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-btn,
.menu-toggle {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: none;
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.theme-btn:hover,
.menu-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--primary);
    color: white;
}

.menu-toggle {
    display: none;
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    gap: 0.5rem;
}

.btn-login,
.btn-register {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.btn-login {
    color: var(--text-color);
    background: var(--surface-color);
    border: 1px solid var(--border-color);
}

.btn-login:hover {
    background: var(--hover-color);
}

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

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(139, 92, 246, 0.4);
}

/* User Menu */
.user-menu {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.user-menu:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.user-name {
    font-weight: 500;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    width: 150px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 100;
    overflow: hidden;
}

.user-menu:hover .user-dropdown {
    display: block;
    animation: slideDown var(--transition-normal);
}

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

.user-dropdown a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-color);
    transition: background var(--transition-fast);
}

.user-dropdown a:hover {
    background: var(--hover-color);
    color: var(--danger);
}

.user-dropdown a i {
    width: 16px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 2rem;
    background: radial-gradient(circle at top right, var(--primary-light), transparent);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, var(--primary-light), transparent);
    opacity: 0.3;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeIn 1s;
}

.hero-subtitle {
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
    display: block;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn-primary,
.btn-outline {
    padding: 1rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(139, 92, 246, 0.4);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.hero-image {
    position: relative;
    animation: slideIn 1s;
}

.floating-books {
    position: relative;
    height: 400px;
}

.floating-books i {
    position: absolute;
    font-size: 6rem;
    color: var(--primary);
    opacity: 0.3;
}

.book-1 {
    top: 0;
    left: 0;
    animation: float 6s infinite;
}

.book-2 {
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    animation: float 8s infinite reverse;
}

.book-3 {
    bottom: 0;
    left: 30%;
    animation: float 7s infinite 1s;
}

/* Section Styles */
section {
    padding: 80px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-subtitle {
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
    display: block;
}

.section-title {
    font-size: 2.5rem;
    color: var(--text-color);
}

/* Add Book Container */
.add-book-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 2rem;
}

.add-book-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 10px;
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

.add-book-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(139, 92, 246, 0.4);
}

/* Books Controls */
.books-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 300px;
    position: relative;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--surface-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.genre-filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.genre-filter {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 5px;
    background: var(--surface-color);
    color: var(--text-color);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.genre-filter:hover,
.genre-filter.active {
    background: var(--primary);
    color: white;
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

/* Book Card */
.book-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
    animation: fadeIn 0.5s;
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.book-card-image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.book-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.book-card:hover .book-card-image img {
    transform: scale(1.1);
}

.book-card-badges {
    position: absolute;
    top: 1rem;
    left: 1rem;
    right: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.book-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    color: white;
}

.book-badge.read {
    background: var(--gradient-success);
}

.book-badge.favorite {
    background: var(--gradient-danger);
}

.book-card-content {
    padding: 1.5rem;
}

.book-card-header {
    margin-bottom: 0.5rem;
}

.book-card-header h3 {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.book-author {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.book-genre {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    background: var(--primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.book-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.stars {
    display: flex;
    gap: 0.25rem;
    color: var(--warning);
}

.stars i {
    font-size: 0.9rem;
}

.rating-count {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.book-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.book-actions {
    display: flex;
    gap: 0.5rem;
}

.book-action-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.book-action-btn:hover {
    transform: scale(1.1);
}

.book-action-btn.read {
    color: var(--success);
}

.book-action-btn.read.active {
    background: var(--success);
    color: white;
}

.book-action-btn.favorite {
    color: var(--danger);
}

.book-action-btn.favorite.active {
    background: var(--danger);
    color: white;
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.stat-card {
    padding: 2rem;
    border-radius: 15px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.stat-card i {
    font-size: 3rem;
    color: var(--primary);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.most-read {
    margin-top: 4rem;
}

.most-read h3 {
    text-align: center;
    margin-bottom: 2rem;
}

/* Modal Styles */
.book-modal,
.book-form-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.book-modal.active,
.book-form-modal.active {
    display: flex;
    animation: fadeIn var(--transition-normal);
}

.modal-content {
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
    border-radius: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: slideUp var(--transition-normal);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background: var(--danger);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: transform var(--transition-fast);
    z-index: 1;
}

.modal-close:hover {
    transform: scale(1.1);
}

/* Book Details in Modal */
.book-detail {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.book-detail-image {
    width: 100%;
    max-height: 300px;
    object-fit: contain;
    border-radius: 10px;
}

.book-detail-header {
    text-align: center;
}

.book-detail-header h2 {
    margin-bottom: 0.5rem;
}

.book-detail-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    color: var(--text-secondary);
}

.book-detail-description {
    line-height: 1.8;
    color: var(--text-secondary);
}

.book-detail-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.book-detail-rating {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.rating-stars {
    display: flex;
    gap: 0.5rem;
}

.rating-stars i {
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.rating-stars i:hover,
.rating-stars i.active {
    color: var(--warning);
    transform: scale(1.2);
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group label i {
    margin-right: 0.5rem;
    color: var(--primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--surface-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.image-preview {
    margin-top: 1rem;
    max-width: 200px;
    border-radius: 10px;
    overflow: hidden;
}

.image-preview img {
    width: 100%;
    height: auto;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.save-btn,
.cancel-btn {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

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

.save-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(139, 92, 246, 0.4);
}

.cancel-btn {
    background: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.cancel-btn:hover {
    background: var(--hover-color);
}

/* Auth Pages */
.auth-page {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.auth-page .navbar {
    background: transparent;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.auth-page .logo,
.auth-page .theme-btn {
    color: white;
}

.auth-page .theme-btn {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.auth-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    margin-top: 60px;
}

.auth-card {
    max-width: 450px;
    width: 100%;
    padding: 2.5rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header i {
    font-size: 3rem;
    color: white;
    margin-bottom: 1rem;
}

.auth-header h2 {
    color: white;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: rgba(255, 255, 255, 0.8);
}

.auth-page .form-group label {
    color: rgba(255, 255, 255, 0.9);
}

.auth-page .form-group input {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    color: white;
}

.auth-page .form-group input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.auth-page .form-group input:focus {
    border-color: white;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.auth-submit {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    background: white;
    color: var(--primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

.auth-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255, 255, 255, 0.4);
}

.auth-redirect {
    text-align: center;
    margin-top: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
}

.auth-redirect a {
    color: white;
    font-weight: 600;
    text-decoration: none;
}

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

/* Footer */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    margin-top: 1rem;
    color: var(--text-secondary);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1.5rem;
}

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

.footer-column ul li {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-column ul li a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-column ul li a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Glass Effect */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

/* Notification */
.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: 10px;
    background: var(--surface-color);
    color: var(--text-color);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary);
    z-index: 2000;
    animation: slideIn var(--transition-normal);
    display: none;
}

.notification.show {
    display: block;
}

.notification.success {
    border-left-color: var(--success);
}

.notification.error {
    border-left-color: var(--danger);
}

.notification.warning {
    border-left-color: var(--warning);
}

/* No Results */
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s;
}

.slide-in {
    animation: slideIn 1s;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-container {
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background: var(--surface-color);
        padding: 2rem;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-links {
        flex-direction: column;
        align-items: center;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero {
        padding-top: 120px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .books-controls {
        flex-direction: column;
    }
    
    .search-box {
        width: 100%;
    }
    
    .genre-filters {
        justify-content: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }
    
    .logo span:not(.highlight) {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .auth-buttons {
        display: none;
    }
    
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 1.5rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .book-detail-meta {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }
}