/* ============================================
   E-Libraro - Modern E-Library CSS
   Mobile-First Responsive Design
   ============================================ */

/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Primary Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;

    /* Accent Colors */
    --accent-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-color: #43e97b;
    --warning-color: #ffa726;
    --error-color: #f5576c;
    --info-color: #4facfe;

    /* Neutral Colors */
    --bg-color: #f8f9fa;
    --bg-alt: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-muted: #a0aec0;
    --border-color: #e2e8f0;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Bottom Nav Height */
    --bottom-nav-height: 64px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    padding-bottom: var(--bottom-nav-height);
}

@media (min-width: 768px) {
    body {
        padding-bottom: 0;
    }
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 0.75rem;
    /* Reduced for mobile */
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ============================================
   Top Navigation Bar
   ============================================ */
.top-bar {
    background: var(--bg-alt);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0.75rem 0;
    /* Optimized for mobile */
}

@media (min-width: 768px) {
    .top-bar {
        padding: var(--spacing-sm) 0;
    }
}

.top-bar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    font-size: 1.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Search */
.desktop-search {
    display: none;
}

@media (min-width: 768px) {
    .desktop-search {
        display: block;
        flex: 1;
        max-width: 500px;
    }
}

.search-form {
    display: flex;
    gap: 0.5rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-btn {
    padding: 0.75rem 1.5rem;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mobile-search-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--bg-color);
    color: var(--text-secondary);
}

@media (min-width: 768px) {
    .mobile-search-icon {
        display: none;
    }
}

/* Top Bar Actions */
.top-bar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-login {
    padding: 0.5rem 1.25rem;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.9rem;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-color);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

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

.user-menu-btn i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.username {
    display: none;
}

@media (min-width: 768px) {
    .username {
        display: inline;
    }
}

.user-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-fast);
}

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

.user-dropdown a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

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

.user-dropdown a i {
    width: 20px;
    color: var(--text-secondary);
}

/* ============================================
   Bottom Navigation Bar (Mobile)
   ============================================ */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--bg-alt);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 0.5rem;
    z-index: 1000;
    border-top: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .bottom-nav {
        display: none;
    }
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    transition: var(--transition-fast);
    border-radius: var(--radius-md);
    min-width: 60px;
    position: relative;
}

.nav-item i {
    font-size: 1.5rem;
    transition: var(--transition-fast);
}

.nav-item span {
    font-size: 0.7rem;
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item.active i {
    transform: scale(1.1);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

/* Upload Button (Center) */
.nav-item:nth-child(2) {
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-full);
    padding: 0.75rem 1.25rem;
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.nav-item:nth-child(2)::before {
    display: none;
}

.nav-item:nth-child(2) i {
    font-size: 1.75rem;
}

.nav-item:nth-child(2):active {
    transform: translateY(-6px) scale(0.95);
}

/* ============================================
   Flash Messages
   ============================================ */
.flash-message {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flash-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.flash-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.flash-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.flash-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.flash-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
}

.flash-close:hover {
    opacity: 1;
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    background: var(--primary-gradient);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.hero-content h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

@media (min-width: 768px) {
    .hero-content h1 {
        font-size: 3rem;
    }
}

.hero-content p {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: var(--spacing-lg);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.stat-item i {
    font-size: 2rem;
    opacity: 0.9;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.85;
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-lg) 0;
}

.section-alt {
    background: var(--bg-alt);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header i {
    color: var(--primary-color);
}

.view-all {
    color: var(--primary-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.view-all:hover {
    gap: 0.75rem;
}

/* ============================================
   Books Grid
   ============================================ */
.books-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .books-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .books-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-lg);
    }
}

@media (min-width: 1280px) {
    .books-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* ============================================
   Book Card
   ============================================ */
.book-card {
    background: var(--bg-alt);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.book-cover {
    position: relative;
    aspect-ratio: 2/3;
    overflow: hidden;
    background: var(--bg-color);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.book-card:hover .book-cover img {
    transform: scale(1.05);
}

.book-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--primary-gradient);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    z-index: 10;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Mobile Search & Notification Icons */
.mobile-search-icon,
.mobile-notification-icon {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    font-size: 1.25rem;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
    position: relative;
    text-decoration: none;
}

.mobile-search-icon:hover,
.mobile-notification-icon:hover {
    background: var(--bg-hover);
    color: var(--primary-color);
}

.mobile-notification-icon span {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--error-color);
    color: white;
    font-size: 10px;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid white;
}

@media (max-width: 768px) {

    .mobile-search-icon,
    .mobile-notification-icon {
        display: flex;
    }
}

.book-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, transparent 60%);
    opacity: 0;
    transition: var(--transition-normal);
    display: flex;
    align-items: flex-end;
    padding: 0.75rem;
}

.book-card:hover .book-overlay {
    opacity: 1;
}

.book-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    width: 100%;
}

.btn-action {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    height: 38px;
    /* Fixed height for consistency */
    padding: 0 0.5rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 600;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-action:hover {
    transform: translateY(-2px);
}

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

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

.btn-download {
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

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

.book-info {
    padding: var(--spacing-sm);
}

.book-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-author {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.book-author i {
    font-size: 0.75rem;
}

.book-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.book-stats {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.book-stats i {
    font-size: 0.6rem;
    /* Smaller icon size */
    opacity: 0.7;
}

.book-category {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
}

.book-stats {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
}

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-block {
    width: 100%;
}

/* ============================================
   Form Elements
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition-fast);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-hint {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
}

.password-input {
    position: relative;
    display: flex;
}

.password-input input {
    flex: 1;
    padding-right: 3rem;
}

.toggle-password {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
}

.toggle-password:hover {
    color: var(--primary-color);
}

/* File Upload */
.file-upload-wrapper {
    position: relative;
}

.file-input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.file-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: var(--spacing-lg);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
}

.file-label:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.file-label i {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.file-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-color);
    border-radius: var(--radius-md);
}

.file-info i {
    font-size: 2rem;
    color: var(--error-color);
}

/* ============================================
   Authentication Pages
   ============================================ */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    padding: var(--spacing-md);
}

.auth-container {
    width: 100%;
    max-width: 450px;
}

.auth-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.auth-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.auth-header p {
    color: var(--text-secondary);
}

.auth-form {
    margin-bottom: var(--spacing-md);
}

.auth-footer {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 600;
}

.forgot-password {
    font-size: 0.9rem;
    color: var(--primary-color);
}

.verification-result {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.success-icon,
.error-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.success-icon i {
    color: var(--success-color);
}

.error-icon i {
    color: var(--error-color);
}

/* ============================================
   Alerts
   ============================================ */
.alert {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.alert ul {
    list-style: none;
    margin: 0;
}

.alert li {
    margin-bottom: 0.25rem;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* ============================================
   Dashboard & Profile
   ============================================ */
.page-header {
    margin-bottom: var(--spacing-lg);
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-header h1 i {
    color: var(--primary-color);
}

.page-header p {
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: white;
}

.stat-details h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

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

.quick-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.action-btn {
    flex: 1;
    min-width: 200px;
    padding: var(--spacing-md);
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    transition: var(--transition-fast);
}

.action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.dashboard-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
}

/* Tables */
.books-table {
    overflow-x: auto;
}

.books-table table {
    width: 100%;
    border-collapse: collapse;
}

.books-table th,
.books-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.books-table th {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
}

.books-table tr:hover {
    background: var(--bg-color);
}

.table-cover {
    width: 50px;
    height: 70px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

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

.btn-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--bg-color);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.btn-danger:hover {
    background: var(--error-color);
    color: white;
}

/* Live Search Styles */
.live-search-wrapper {
    width: 100%;
}

.live-search-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border-radius: 0 0 12px 12px;
    z-index: 1000;
    margin-top: 5px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
    animation: fadeIn 0.2s ease-out;
}

.search-loading,
.search-no-results,
.search-error {
    padding: 15px;
    text-align: center;
    color: #64748b;
    font-size: 0.9rem;
}

.search-results-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.search-result-item {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    text-decoration: none;
    border-bottom: 1px solid #f1f5f9;
    transition: background 0.2s;
}

.search-result-item:hover {
    background: #f8fafc;
}

.result-cover {
    width: 40px;
    height: 60px;
    object-fit: cover;
    border-radius: 4px;
    margin-right: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.result-info {
    flex: 1;
}

.result-title {
    color: #1e293b;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 2px;
    line-height: 1.3;
}

.result-author {
    color: #64748b;
    font-size: 0.85rem;
}

.view-all-results {
    display: block;
    text-align: center;
    padding: 12px;
    background: #f8fafc;
    color: #4f46e5;
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    transition: background 0.2s;
}

.view-all-results:hover {
    background: #eef2ff;
}

/* Profile Grid */
.profile-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .profile-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.profile-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.profile-card h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ============================================
   Categories Page
   ============================================ */
.categories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.category-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition-fast);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.category-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
}

.category-info {
    flex: 1;
}

.category-info h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.category-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.category-count {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.category-arrow {
    color: var(--text-muted);
    font-size: 1.25rem;
}

/* ============================================
   Search & Filters
   ============================================ */
.search-filters {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
}

.search-filter-form {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

@media (min-width: 768px) {
    .search-filter-form {
        grid-template-columns: 2fr 1fr auto auto;
    }
}

.filter-group {
    display: flex;
}

.search-results-count {
    color: var(--text-secondary);
}

/* ============================================
   PDF Reader
   ============================================ */
.reader-page {
    padding-bottom: 0;
}

.reader-header {
    background: white;
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md) 0;
    margin-bottom: 0;
}

.reader-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

@media (min-width: 768px) {
    .reader-info {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.book-details h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.book-meta-info {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.book-meta-info span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

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

.reader-container {
    height: calc(100vh - 200px);
    background: var(--bg-color);
}

.pdf-viewer {
    width: 100%;
    height: 100%;
}

.pdf-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: var(--spacing-md);
}

.book-description-section {
    background: white;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-lg);
}

/* ============================================
   Upload Page
   ============================================ */
.upload-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    max-width: 800px;
    margin: 0 auto;
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.upload-progress {
    margin-top: var(--spacing-md);
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ============================================
   Pagination
   ============================================ */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.page-link {
    padding: 0.5rem 1rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    transition: var(--transition-fast);
}

.page-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-link.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
}

.page-numbers {
    display: flex;
    gap: 0.5rem;
}

/* ============================================
   Empty States
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-lg);
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-sm);
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   Responsive Utilities
   ============================================ */
@media (max-width: 767px) {
    .hide-mobile {
        display: none !important;
    }
}

@media (min-width: 768px) {
    .hide-desktop {
        display: none !important;
    }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-normal);
}

.slide-up {
    animation: slideUp var(--transition-normal);
}

/* ============================================
   Print Styles
   ============================================ */
@media print {

    .top-bar,
    .bottom-nav,
    .footer,
    .btn,
    .book-overlay {
        display: none !important;
    }
}

.btn-google {
    display: flex;
    align-items: center;
    width: 100%;
    background: #4285F4;
    color: white;
    border: none;
    border-radius: 4px;
    /* Standard rounded edges */
    padding: 1px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    margin-bottom: 1.5rem;
}

.btn-google .google-icon-wrapper {
    background: white;
    padding: 10px;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1px;
}

.btn-google .btn-text {
    flex: 1;
    text-align: center;
    font-size: 14px;
    font-family: 'Roboto', sans-serif;
    padding-right: 12px;
    /* Balance the visual weight */
}

.btn-google:hover {
    background: #357ae8;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.25);
    color: white;
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    color: #888;
    margin: 1.5rem 0;
    font-size: 0.9rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid #eee;
}

.divider span {
    padding: 0 10px;
    font-weight: 500;
}


/* ============================================
   Auth Modal Styles (Login/Signup Popup)
   ============================================ */
.auth-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.auth-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.auth-modal {
    background: white;
    width: 90%;
    max-width: 400px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    overflow: hidden;
}

.auth-modal-overlay.active .auth-modal {
    transform: translateY(0);
}

.auth-modal-header {
    padding: var(--spacing-lg);
    text-align: center;
    background: var(--bg-color);
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.auth-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

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

.auth-modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.auth-modal-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    padding: 1rem;
    border: none;
    background: none;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.auth-tab.active {
    color: var(--primary-color);
    background: white;
}

.auth-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.auth-modal-body {
    padding: var(--spacing-lg);
}

.auth-tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

/* Reference Style Form Elements */
.auth-form-group {
    margin-bottom: 1rem;
}

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

.auth-form-input {
    width: 100%;
    padding: 0.8rem 1rem;
    background: #f0f2f5;
    /* Light grey background from reference */
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    font-family: inherit;
}

.auth-form-input:focus {
    background: white;
    border-color: var(--border-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.auth-submit-btn {
    width: 100%;
    padding: 0.8rem;
    background: #FFCA28;
    /* Yellow/Gold from reference */
    color: #333;
    font-weight: 600;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.auth-submit-btn:hover {
    background: #FFD54F;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.auth-form-extras {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.auth-checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.auth-checkbox {
    accent-color: var(--primary-color);
}

.auth-forgot-link {
    color: var(--primary-color);
    font-weight: 500;
}

.auth-footer-text {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 1.5rem;
}

.password-input-wrapper {
    position: relative;
    display: flex;
}

.password-toggle {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 5px;
}

.password-toggle:hover {
    color: var(--text-primary);
}

/* Notification Popup Styles */
.notification-popup {
    position: absolute;
    top: 50px;
    right: -10px;
    /* Align with the right edge of the icons */
    width: 300px;
    /* Fixed width for better layout */
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    z-index: 1100;
    /* Ensure it's above everything else */
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.95);
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transform-origin: top right;
}

.notification-popup.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* Arrow for the popup */
.notification-popup::before {
    content: '';
    position: absolute;
    top: -6px;
    right: 20px;
    width: 12px;
    height: 12px;
    background: white;
    transform: rotate(45deg);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    border-left: 1px solid rgba(0, 0, 0, 0.05);
}

.notification-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fafafa;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.notification-header h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-primary);
}

.notification-mark-read {
    font-size: 0.8rem;
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: none;
    font-weight: 600;
}

.notification-list {
    max-height: 350px;
    overflow-y: auto;
    padding: 0;
}

.notification-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
    transition: var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
    align-items: flex-start;
}

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

.notification-item:hover {
    background: var(--bg-color);
}

.notification-item.unread {
    background: #f0f7ff;
}

.notification-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
    font-size: 0.9rem;
    margin-top: 2px;
}

.notification-content {
    flex: 1;
}

.notification-content p {
    font-size: 0.85rem;
    margin: 0 0 4px 0;
    color: var(--text-primary);
    line-height: 1.4;
}

.notification-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: block;
}

.notification-empty {
    padding: 40px 20px;
    text-align: center;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.notification-empty i {
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--text-muted);
    opacity: 0.5;
}

.notification-empty p {
    font-size: 0.9rem;
    margin: 0;
}


/* Force notification icon visibility on desktop */
.mobile-notification-icon {
    display: flex !important;
}

/* Ensure search icon remains hidden on desktop */
@media (min-width: 769px) {
    .mobile-search-icon {
        display: none !important;
    }
}