/* Apple Minimalist Design System */
/* Pure White, Clean, Precise - Steve Jobs Inspired */

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

/* Minimalist Color System - Pure White Theme */
:root {
    /* Primary Colors - Apple Blue Only */
    --primary: #007AFF;
    --primary-hover: #0056CC;
    
    /* Pure White System */
    --white: #FFFFFF;
    --white-soft: #FAFAFA;
    --pale-blue: #F0F8FF;
    
    /* Text Hierarchy - Apple Precision */
    --text-primary: #1D1D1F;
    --text-secondary: #8E8E93;
    --text-tertiary: #C7C7CC;
    --text-inverse: #FFFFFF;
    
    /* Borders - Minimal */
    --border-light: #F2F2F7;
    --border-medium: #E5E5EA;
    
    /* Shadows - Subtle */
    --shadow-soft: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.08);
    
    /* Spacing - 8px Grid System */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    --space-8: 64px;
    --space-10: 80px;
    --space-12: 96px;
    
    /* Typography - Apple San Francisco */
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 15px;
    --font-size-lg: 17px;
    --font-size-xl: 19px;
    --font-size-2xl: 22px;
    --font-size-3xl: 28px;
    --font-size-4xl: 34px;
    --font-size-5xl: 48px;
    
    /* Border Radius - Minimal */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Transitions - Apple Smooth */
    --transition: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Base Typography */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    font-size: var(--font-size-base);
    line-height: 1.47;
    color: var(--text-primary);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.01em;
}

/* Typography Scale - Apple Precision */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin: 0;
}

h1 { font-size: var(--font-size-4xl); margin-bottom: var(--space-2); }
h2 { font-size: var(--font-size-3xl); margin-bottom: var(--space-2); }
h3 { font-size: var(--font-size-2xl); margin-bottom: var(--space-2); }
h4 { font-size: var(--font-size-xl); margin-bottom: var(--space-1); }
h5 { font-size: var(--font-size-lg); margin-bottom: var(--space-1); }
h6 { font-size: var(--font-size-base); margin-bottom: var(--space-1); }

p {
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0 0 var(--space-2);
}

/* Container System */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--space-3);
}

/* Layout System */
.section {
    padding: var(--space-10) 0;
}

.section-sm {
    padding: var(--space-8) 0;
}

.section-lg {
    padding: var(--space-12) 0;
}

/* Grid System with Equal Heights */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--space-1));
    align-items: stretch;
}

.col, .col-12, .col-md-6, .col-md-4, .col-lg-8, .col-lg-4, .col-lg-6 {
    padding: 0 var(--space-1);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.col-12 { flex: 0 0 100%; }
.col-md-6 { flex: 0 0 50%; }
.col-md-4 { flex: 0 0 33.333333%; }
.col-lg-8 { flex: 0 0 66.666667%; }
.col-lg-6 { flex: 0 0 50%; }
.col-lg-4 { flex: 0 0 33.333333%; }

/* Button System - Apple Minimal */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    -webkit-appearance: none;
    appearance: none;
    white-space: nowrap;
}

.btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--text-inverse);
    border: none;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 1px solid var(--border-medium);
}

.btn-outline:hover {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.btn-sm {
    padding: 6px var(--space-2);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-lg);
}

/* Card System - Clean Apple Style with Equal Heights */
.card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.card-body {
    padding: var(--space-3);
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-img-top {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

/* Navigation - Minimal White */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--space-2) 0;
}

.navbar-brand {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: var(--space-2);
    align-items: center;
    flex-wrap: nowrap;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 400;
    font-size: var(--font-size-base);
    transition: var(--transition);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

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

.nav-link i {
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

/* Navigation Dropdowns */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-medium);
    min-width: 200px;
    padding: var(--space-1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1001;
}

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

.nav-dropdown:hover .nav-link i {
    transform: rotate(180deg);
}

.dropdown-item {
    display: block;
    padding: var(--space-1) var(--space-2);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: var(--font-size-sm);
}

.dropdown-item:hover {
    background-color: var(--white-soft);
    color: var(--primary);
}

/* Hamburger Menu - Hidden on Desktop */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    position: relative;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
    transform-origin: 1px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Menu - Hidden by default on desktop */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%; /* Start from right side */
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--white);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    z-index: 9999;
    overflow-y: auto;
    padding-top: 80px;
    display: none; /* Hidden by default */
}

.mobile-menu.active {
    right: 0; /* Slide in from right */
    display: block;
}

.mobile-nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-nav-links li {
    margin-bottom: var(--space-1);
}

.mobile-nav-links a {
    display: block;
    padding: var(--space-2);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mobile-nav-links a:hover,
.mobile-nav-links a.active {
    background-color: var(--white-soft);
    color: var(--primary);
}

.mobile-language-switcher {
    margin-top: var(--space-6);
    padding-top: var(--space-3);
    border-top: 1px solid var(--border-light);
}

/* Hero Section - Apple Minimalist Style */
.hero {
    background: var(--pale-blue);
    color: var(--text-primary);
    padding: var(--space-12) 0 var(--space-10) 0;
    text-align: center;
    position: relative;
    border-bottom: 1px solid var(--border-light);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.hero-title {
    font-size: clamp(var(--font-size-4xl), 6vw, 72px);
    font-weight: 600;
    margin-bottom: var(--space-4);
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    font-weight: 400;
    letter-spacing: 0.2px;
    text-transform: uppercase;
}

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--space-8);
    line-height: 1.5;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

/* CTA Hero Section - Apple Minimalist */
.hero-cta {
    background: var(--pale-blue);
    color: var(--text-primary);
    padding: var(--space-10) 0 var(--space-8) 0;
    text-align: center;
    position: relative;
    border-top: 1px solid var(--border-light);
}

.hero-cta .hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero-cta h2 {
    font-size: clamp(var(--font-size-3xl), 5vw, 48px);
    font-weight: 600;
    margin-bottom: var(--space-3);
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.hero-cta .hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.5;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

/* Forms - Clean Minimal */
.form-group {
    margin-bottom: var(--space-3);
}

.form-label {
    display: block;
    margin-bottom: var(--space-1);
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.form-control {
    width: 100%;
    padding: var(--space-2);
    font-size: var(--font-size-base);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    background-color: var(--white);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* Alerts - Minimal */
.alert {
    padding: var(--space-3);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
    border: 1px solid var(--border-light);
}

.alert-success {
    background-color: rgba(52, 199, 89, 0.1);
    border-color: #34C759;
    color: #1D8348;
}

.alert-danger {
    background-color: rgba(255, 59, 48, 0.1);
    border-color: #FF3B30;
    color: #D70015;
}

/* Library Section */
.library-section {
    background-color: var(--white-soft);
}

/* Stats Section - Minimal Apple Style */
.stats {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--space-6);
}

.stat-item {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    text-align: center;
    min-width: 120px;
    transition: var(--transition);
}

.stat-item:hover {
    border-color: var(--border-medium);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    color: var(--primary);
    display: block;
    margin-bottom: var(--space-1);
    line-height: 1;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-3);
}

.book-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.book-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.book-icon-wrapper {
    position: relative;
    margin-bottom: var(--space-3);
}

.book-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 24px;
    transition: var(--transition);
}

.book-card:hover .book-icon {
    background-color: var(--primary);
    color: var(--white);
    transform: scale(1.1);
}

.book-badges {
    position: absolute;
    top: -8px;
    right: -8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.book-badges .badge {
    font-size: 10px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.book-badges .badge.featured {
    background-color: var(--warning);
    color: var(--white);
}

.book-badges .badge.availability.available {
    background-color: var(--success-light);
    color: var(--success);
}

.book-badges .badge.availability.borrowed {
    background-color: var(--warning-light);
    color: var(--warning);
}

.book-badges .badge.availability.unavailable {
    background-color: var(--gray-light);
    color: var(--gray);
}

.book-year {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-3);
}

.book-actions {
    display: flex;
    gap: var(--space-2);
    margin-top: auto;
}

.book-cover-wrapper {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    background-color: var(--white-soft);
}

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

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

.book-info {
    padding: var(--space-3);
}

.book-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    line-height: 1.3;
}

.book-author {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-2);
}

/* Journals Section */

.journals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-4);
}

.journal-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.journal-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

/* Journal Cover Styles - Proper Aspect Ratio */
.journal-cover-wrapper {
    width: 100%;
    aspect-ratio: 3/4;
    overflow: hidden;
    background-color: var(--white-soft);
    border-radius: var(--radius-md);
    position: relative;
}

.journal-cover-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.journal-card:hover .journal-cover-image {
    transform: scale(1.02);
}

.journal-content {
    padding: var(--space-3);
}

.journal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.journal-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.journal-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    transition: var(--transition);
}

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

/* Post Styles */
/* Hero Small - For sub-pages - Apple Minimalist */
.hero-sm {
    background: var(--pale-blue);
    color: var(--text-primary);
    padding: var(--space-8) 0 var(--space-6) 0;
    text-align: center;
    position: relative;
    border-bottom: 1px solid var(--border-light);
}

.hero-sm .hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.hero-sm .hero-title {
    font-size: clamp(var(--font-size-3xl), 5vw, 48px);
    font-weight: 600;
    margin-bottom: var(--space-3);
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.hero-sm .hero-text {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
    font-weight: 400;
}

.hero-sm .post-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    margin: var(--space-4) 0 0 0;
    font-size: var(--font-size-sm);
}

.hero-sm .post-meta span {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    color: var(--text-secondary);
    font-weight: 400;
    padding: var(--space-1) var(--space-2);
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
}

.blog-post-content {
    background: var(--white);
    padding: var(--space-6);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
}

.post-content {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--text-primary);
}

.post-content h2, .post-content h3 {
    margin-top: var(--space-5);
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.post-content p {
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--space-3) 0;
}

.post-tags {
    margin-top: var(--space-5);
    padding-top: var(--space-3);
    border-top: 1px solid var(--border-light);
}

.tag {
    display: inline-block;
    padding: 4px var(--space-1);
    margin: 0 4px 4px 0;
    background: var(--white-soft);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition: var(--transition);
}

.tag:hover {
    background: var(--primary);
    color: var(--text-inverse);
}

.post-share {
    margin-top: var(--space-5);
    padding-top: var(--space-3);
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-inverse);
    text-decoration: none;
    transition: var(--transition);
}

.share-btn.facebook { background: #1877F2; }
.share-btn.twitter { background: #1DA1F2; }
.share-btn.linkedin { background: #0077B5; }
.share-btn.pinterest { background: #BD081C; }

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

/* Post Attachments */
.post-attachments {
    background: var(--white-soft);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    margin-bottom: var(--space-6);
}

.post-attachments h5 {
    color: var(--primary);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-lg);
}

.attachment-list {
    display: flex;
        flex-direction: column;
    gap: var(--space-2);
}

.attachment-item {
    display: flex;
    align-items: center;
    padding: var(--space-2);
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.attachment-item:hover {
    border-color: var(--border-medium);
}

.attachment-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--space-2);
}

.attachment-icon i {
    font-size: var(--font-size-lg);
    color: var(--text-inverse);
}

.attachment-details {
    flex: 1;
    min-width: 0;
}

.attachment-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
    font-size: var(--font-size-base);
}

.attachment-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.4;
}

.attachment-actions {
    flex-shrink: 0;
    margin-left: var(--space-2);
}

/* Gallery Styles */
.post-gallery {
    margin: var(--space-6) 0;
    padding: var(--space-3);
    background: var(--white-soft);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
}

.gallery-title {
    color: var(--primary);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-lg);
}

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

.gallery-item {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.gallery-item:hover {
    transform: scale(1.02);
}

.gallery-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

/* Sidebar */
.sidebar {
    margin-bottom: var(--space-6);
}

.widget {
    margin-bottom: var(--space-6);
    padding: var(--space-3);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background-color: var(--white);
}

.widget-title {
    margin: 0 0 var(--space-3);
    padding-bottom: var(--space-1);
    border-bottom: 1px solid var(--border-light);
    font-size: var(--font-size-xl);
    color: var(--text-primary);
}

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

.category-list li {
    padding: var(--space-1) 0;
    border-bottom: 1px solid var(--border-light);
}

.category-list li:last-child {
    border-bottom: none;
}

.category-list li a {
    display: flex;
    justify-content: space-between;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.category-list li.active a,
.category-list li a:hover {
    color: var(--primary);
}

.recent-posts-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.recent-post-item {
    display: flex;
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--border-light);
}

.recent-post-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.post-thumbnail {
    width: 80px;
    height: 80px;
    margin-right: var(--space-3);
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
    background-color: var(--white-soft);
}

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

.post-info {
    flex: 1;
}

.post-title {
    margin: 0 0 2px;
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

.post-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.post-title a:hover {
    color: var(--primary);
}

.post-date {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-1);
    margin: var(--space-8) 0;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background-color: var(--white);
    color: var(--text-primary);
    text-decoration: none;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    font-weight: 500;
}

.page-link:hover,
.page-link.active {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

/* No Content States */
.no-books,
.no-journals {
    text-align: center;
    padding: var(--space-8) var(--space-3);
    color: var(--text-secondary);
}

.error-message {
    background-color: rgba(255, 59, 48, 0.1);
    border: 1px solid #FF3B30;
    color: #D70015;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    text-align: center;
    margin: var(--space-3) 0;
}

/* Feature Icons - Clean Apple Style */
.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--primary);
    font-size: var(--font-size-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin: 0 auto;
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-flex { display: flex; }
.d-block { display: block; }
.d-none { display: none; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.align-center { align-items: center; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }

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

.img-fluid {
    max-width: 100%;
    height: auto;
}

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }

/* Mobile Overlay */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 9998;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-2);
    }
    
    .navbar-nav {
        display: none;
    }
    
    /* Show hamburger menu on mobile */
    .hamburger {
        display: flex !important;
    }
    
    
    
    .no-scroll {
        overflow: hidden;
    }
    
    .hero-title {
        font-size: clamp(var(--font-size-3xl), 8vw, 48px);
        margin-bottom: var(--space-3);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-2);
    }
    
    .hero-description {
        font-size: var(--font-size-lg);
        margin-bottom: var(--space-6);
    }
    
    .hero-sm .hero-title {
        font-size: clamp(var(--font-size-2xl), 6vw, 36px);
        margin-bottom: var(--space-2);
    }
    
    .hero-sm .hero-text {
        font-size: var(--font-size-base);
    }
    
    .hero-sm .post-meta {
        gap: var(--space-2);
        font-size: var(--font-size-xs);
        margin-top: var(--space-3);
    }
    
    .hero-cta h2 {
        font-size: clamp(var(--font-size-2xl), 6vw, 36px);
        margin-bottom: var(--space-2);
    }
    
    .hero-cta .hero-description {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-4);
    }
    
    .books-grid,
    .journals-grid {
        grid-template-columns: 1fr;
    }
    
    .stats {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .attachment-item {
    flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .attachment-icon {
        margin-right: 0;
        margin-bottom: var(--space-1);
    }
    
    .attachment-actions {
        margin-left: 0;
        width: 100%;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--space-1);
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: var(--space-6);
        text-align: center;
    }

    .footer-links {
        display: flex;
        flex-direction: column;
        gap: var(--space-4);
        align-items: center;
    }

    .footer-column {
        min-width: auto;
        text-align: center;
    }

    .footer-links .connect-section {
        text-align: center;
    }

    
    .footer-brand {
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }

    .footer-legal {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--space-8) 0 var(--space-6) 0;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--space-2);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-sm);
        margin-bottom: var(--space-1);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-4);
    }
    
    .hero-sm {
        padding: var(--space-6) 0 var(--space-4) 0;
    }
    
    .hero-sm .hero-title {
        font-size: var(--font-size-xl);
        margin-bottom: var(--space-1);
    }
    
    .hero-sm .hero-text {
        font-size: var(--font-size-sm);
    }
    
    .hero-cta {
        padding: var(--space-6) 0 var(--space-4) 0;
    }
    
    .hero-cta h2 {
        font-size: var(--font-size-xl);
        margin-bottom: var(--space-1);
    }
    
    .hero-cta .hero-description {
        font-size: var(--font-size-sm);
        margin-bottom: var(--space-3);
    }
    
    .section {
        padding: var(--space-8) 0;
    }
    
    .blog-post-content {
        padding: var(--space-3);
    }
    
    .card-body {
        padding: var(--space-2);
    }
}

/* Video Thumbnail - Apple Style */
.video-wrapper {
    position: relative;
    width: 100%;
    height: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-color: var(--white-soft);
    border: 1px solid var(--border-light);
}

.video-thumbnail {
    position: relative;
    width: 100%;
    height: 100%;
    cursor: pointer;
    transition: var(--transition);
}

.video-thumbnail:hover {
    transform: scale(1.02);
}

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

.video-thumbnail:hover .video-thumbnail-img {
    filter: brightness(1.1);
}

.video-play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-xl);
    transition: var(--transition);
}

.video-thumbnail:hover .video-play-button {
    background-color: var(--primary-hover);
    transform: translate(-50%, -50%) scale(1.05);
}

.video-play-button i {
    margin-left: 4px;
}

/* Subjects Grid - Apple Style with Equal Heights */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.subject-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    text-align: center;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 280px;
}

.subject-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.subject-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(0, 122, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-3);
    color: var(--primary);
    font-size: var(--font-size-xl);
}

.subject-card h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.subject-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-base);
    margin: 0;
}

/* Responsive Design for Video and Subjects */
@media (max-width: 1024px) {
    .subjects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .video-wrapper {
        height: 250px;
    }
    
    .video-play-button {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-lg);
    }
    
    .subjects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }
    
    .subject-card {
        padding: var(--space-4);
        min-height: 260px;
    }
    
    .subject-icon {
        width: 60px;
        height: 60px;
        font-size: var(--font-size-xl);
    }
    
    .subject-card h4 {
        font-size: var(--font-size-lg);
    }
}

@media (max-width: 480px) {
    .video-wrapper {
        height: 200px;
    }
    
    .video-play-button {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-base);
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    
    .subject-card {
        padding: var(--space-3);
        min-height: 240px;
    }
    
    .subject-icon {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-lg);
    }
}

/* Footer - Apple Style */
.footer {
    background-color: var(--white);
    border-top: 1px solid var(--border-light);
    padding: var(--space-8) 0 var(--space-4) 0;
    margin-top: var(--space-12);
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--border-light);
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--space-6);
    align-items: start;
}

.footer-links .connect-section {
    grid-column: 1 / -1;
    text-align: center;
}

.footer-brand h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    letter-spacing: -0.02em;
}

.footer-brand p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
    max-width: 300px;
}

.footer-column {
    flex: 1;
    min-width: 200px;
}

.footer-column h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column li {
    margin-bottom: var(--space-2);
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
    display: block;
    padding: var(--space-1) 0;
}

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

.social-links {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--white-soft);
    border-radius: 50%;
    color: var(--text-secondary);
    transition: var(--transition);
    text-decoration: none;
}

.social-links a:hover {
    background-color: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.footer-email {
    margin: 0;
}

.footer-email a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-4);
}

.footer-copyright p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
}

.footer-legal {
    display: flex;
    gap: var(--space-4);
}

.footer-legal a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

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

/* News Page - Apple Minimalist Styles */
.blog-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
}

.blog-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.card-img-top-wrapper {
    height: 240px;
    overflow: hidden;
    background-color: var(--white-soft);
}

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

.blog-card:hover .card-img-top {
    transform: scale(1.01);
}

.card-body {
    padding: var(--space-4);
}

.category-badge {
    display: inline-block;
    padding: 6px var(--space-2);
    border-radius: var(--radius-sm);
    background-color: var(--primary);
    color: var(--text-inverse);
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-transform: uppercase;
    margin-bottom: var(--space-3);
    text-decoration: none;
    transition: var(--transition);
    letter-spacing: 0.5px;
}

.category-badge:hover {
    background-color: var(--primary-hover);
    color: var(--text-inverse);
    text-decoration: none;
}

.card-title {
    margin-bottom: var(--space-3);
}

.card-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.card-title a:hover {
    color: var(--primary);
    text-decoration: none;
}

.post-meta {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.post-meta span {
    margin-right: var(--space-2);
}

.btn-outline-primary {
    background-color: transparent;
    color: var(--primary);
    border: 1px solid var(--border-medium);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.btn-outline-primary:hover {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
    text-decoration: none;
    transform: translateY(-1px);
}

/* Pagination - Apple Style */
.pagination-container {
    margin-top: var(--space-8);
    display: flex;
    justify-content: center;
}

.pagination {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--space-1);
}

.page-item {
    margin: 0;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    min-width: 36px;
    padding: 0 var(--space-2);
    border-radius: var(--radius-sm);
    background-color: var(--white);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    text-decoration: none;
    font-weight: 500;
}

.page-item.active .page-link,
.page-link:hover {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}



/* News Page - True Apple Minimalism */
.categories-nav {
    display: flex;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--border-light);
}

.nav-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 400;
    padding: var(--space-1) 0;
    transition: var(--transition);
    position: relative;
}

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

.nav-item.active {
    color: var(--text-primary);
    font-weight: 500;
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: calc(-1 * var(--space-2) - 1px);
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--text-primary);
}

.news-main {
    width: 100%;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-12);
}

.post-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.post-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.post-image-wrapper {
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    background-color: var(--white-soft);
}

.post-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.post-card:hover .post-image {
    transform: scale(1.05);
}

.post-content {
    padding: var(--space-4);
}

.category-badge {
    display: inline-block;
    padding: 4px var(--space-2);
    background-color: var(--primary);
    color: var(--text-inverse);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-decoration: none;
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.post-title {
    margin-bottom: var(--space-3);
}

.post-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.3;
}

.post-title a:hover {
    color: var(--primary);
}

.post-meta {
    margin-bottom: var(--space-3);
}

.post-date {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.post-date i {
    color: var(--text-tertiary);
}

/* Responsive Design for News Page */
@media (max-width: 1024px) {
    .posts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }
    
    .categories-nav {
        gap: var(--space-6);
        margin-bottom: var(--space-10);
    }
}

@media (max-width: 768px) {
    .posts-grid {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    
    .categories-nav {
        flex-wrap: wrap;
        gap: var(--space-4);
        margin-bottom: var(--space-8);
    }
}

@media (max-width: 480px) {
    .categories-nav {
        gap: var(--space-3);
    }
    
    .nav-item {
        font-size: var(--font-size-sm);
    }
}

/* Library Page - Apple Minimalist Styles with Icons */
.featured-books {
    margin-bottom: var(--space-10);
}

.featured-books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-6);
}

.featured-book-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.featured-book-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.featured-book-card .book-icon-wrapper {
    height: 200px;
    background: linear-gradient(135deg, var(--white-soft) 0%, var(--white) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border-bottom: 1px solid var(--border-light);
}

.featured-book-card .book-icon {
    width: 80px;
    height: 80px;
    background-color: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-3xl);
    transition: var(--transition);
}

.featured-book-card:hover .book-icon {
    transform: scale(1.05);
    background-color: var(--primary-hover);
}

.featured-book-card .featured-badge {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    width: 32px;
    height: 32px;
    background-color: #FF9500;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-sm);
}

.featured-book-card .book-info {
    padding: var(--space-4);
}

.featured-book-card .book-title {
    margin-bottom: var(--space-2);
}

.featured-book-card .book-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.3;
}

.featured-book-card .book-title a:hover {
    color: var(--primary);
}

.featured-book-card .book-author {
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    font-size: var(--font-size-base);
}

.featured-book-card .subject-tag {
    display: inline-block;
    padding: 4px var(--space-2);
    background-color: var(--white-soft);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-3);
}

/* Filter Section */
.filter-section {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
}

.filter-form {
    width: 100%;
}

.filter-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: var(--space-3);
    align-items: end;
}

.filter-group {
    display: flex;
    flex-direction: column;
}

.filter-group .form-label {
    margin-bottom: var(--space-1);
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.search-input {
    display: flex;
    gap: var(--space-1);
}

.search-input .form-control {
    flex: 1;
}

.filter-actions {
    display: flex;
    gap: var(--space-2);
    align-items: center;
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.book-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.book-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.book-icon-wrapper {
    position: relative;
    height: 160px;
    background: linear-gradient(135deg, var(--white-soft) 0%, var(--white) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-light);
}

.book-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-2xl);
    transition: var(--transition);
}

.book-card:hover .book-icon {
    transform: scale(1.05);
    background-color: var(--primary-hover);
}

.book-badges {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.badge {
    padding: 4px var(--space-2);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 2px;
}

.badge.featured {
    background-color: var(--primary);
    color: var(--text-inverse);
}

.badge.availability.available {
    background-color: var(--primary);
    color: var(--text-inverse);
}

.badge.availability.borrowed {
    background-color: #FF9500;
    color: var(--text-inverse);
}

.badge.availability.maintenance {
    background-color: var(--text-tertiary);
    color: var(--text-inverse);
}

.book-info {
    padding: var(--space-3);
}

.book-title {
    margin-bottom: var(--space-2);
}

.book-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.3;
}

.book-title a:hover {
    color: var(--primary);
}

.book-author {
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
    font-size: var(--font-size-sm);
}

.book-year {
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
}

.book-subjects {
    margin-bottom: var(--space-3);
}

.subject-tag {
    display: inline-block;
    padding: 2px var(--space-1);
    background-color: var(--white-soft);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    margin-right: var(--space-1);
    margin-bottom: var(--space-1);
}

.book-actions {
    display: flex;
    gap: var(--space-2);
    align-items: center;
}

.book-actions .btn {
    flex: 1;
    text-align: center;
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .filter-row {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    
    .filter-actions {
        justify-content: stretch;
    }
    
    .filter-actions .btn {
        flex: 1;
    }
    
    .featured-books-grid {
        grid-template-columns: 1fr;
    }
    
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--space-3);
    }
    
    .book-card {
        padding: var(--space-3);
    }
    
    .book-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .book-actions {
        flex-direction: column;
    }
    
    .book-actions .btn {
        width: 100%;
    }
    
    .featured-book-card .book-icon-wrapper {
        height: 160px;
    }
    
    .featured-book-card .book-icon {
        width: 60px;
        height: 60px;
        font-size: var(--font-size-2xl);
    }
}

@media (max-width: 480px) {
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .book-card {
        padding: var(--space-3);
    }
    
    .book-icon {
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
    
    .book-actions {
        flex-direction: column;
        gap: var(--space-2);
    }
}

/* Book Detail Page - Apple Minimalist Styles */
.book-detail-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-8);
    margin-bottom: var(--space-10);
}

.book-icon-section {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    height: fit-content;
}

.book-icon-wrapper {
    position: relative;
    margin-bottom: var(--space-4);
}

.book-icon-section .book-icon {
    width: 120px;
    height: 120px;
    background-color: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-4xl);
    margin: 0 auto var(--space-3);
    transition: var(--transition);
}

.book-icon-section .book-icon:hover {
    transform: scale(1.05);
    background-color: var(--primary-hover);
}

.book-icon-section .book-badges {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    align-items: center;
}

.book-icon-section .badge {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: var(--space-1);
    width: fit-content;
}

.book-icon-section .badge.featured {
    background-color: var(--primary);
    color: var(--text-inverse);
}

.book-icon-section .badge.availability.available {
    background-color: var(--primary);
    color: var(--text-inverse);
}

.book-icon-section .badge.availability.borrowed {
    background-color: #FF9500;
    color: var(--text-inverse);
}

.book-icon-section .badge.format {
    background-color: var(--white-soft);
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.book-icon-section .book-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.book-icon-section .book-actions .btn {
    padding: var(--space-2) var(--space-4);
    font-weight: 500;
    border-radius: var(--radius-md);
}

.book-info-section {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
}

.book-metadata {
    margin-bottom: var(--space-6);
}

.metadata-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.metadata-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.metadata-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metadata-value {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: 400;
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.section-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-base);
}

.related-subjects {
    margin-bottom: var(--space-6);
}

.related-subjects .subject-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.related-subjects .subject-tag {
    padding: var(--space-1) var(--space-3);
    background-color: var(--white-soft);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 400;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.related-subjects .subject-tag:hover {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.book-description {
    margin-bottom: var(--space-6);
}

.description-content {
    color: var(--text-primary);
    line-height: 1.6;
    font-size: var(--font-size-base);
}

.book-keywords {
    margin-bottom: var(--space-6);
}

.keywords {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.keyword-tag {
    padding: var(--space-1) var(--space-2);
    background-color: var(--white-soft);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    border: 1px solid var(--border-light);
}

.related-books {
    margin-top: var(--space-10);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-light);
}

.related-books .section-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.related-books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
}

.related-book-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.related-book-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.related-book-card .book-icon-wrapper {
    height: 120px;
    background: linear-gradient(135deg, var(--white-soft) 0%, var(--white) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-light);
}

.related-book-card .book-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-xl);
    transition: var(--transition);
}

.related-book-card:hover .book-icon {
    transform: scale(1.05);
    background-color: var(--primary-hover);
}

.related-book-card .book-info {
    padding: var(--space-3);
}

.related-book-card .book-title {
    margin-bottom: var(--space-2);
}

.related-book-card .book-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.3;
}

.related-book-card .book-title a:hover {
    color: var(--primary);
}

.related-book-card .book-author {
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
}

.related-book-card .book-subjects {
    margin-bottom: var(--space-3);
}

.related-book-card .subject-tag {
    display: inline-block;
    padding: 2px var(--space-1);
    background-color: var(--white-soft);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
}

.related-book-card .book-actions {
    display: flex;
    gap: var(--space-2);
    align-items: center;
}

.related-book-card .book-actions .btn {
    flex: 1;
    text-align: center;
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Responsive Design for Book Detail */
@media (max-width: 768px) {
    .book-detail-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .book-icon-section {
        padding: var(--space-4);
    }
    
    .book-icon-section .book-icon {
        width: 80px;
        height: 80px;
        font-size: var(--font-size-2xl);
    }
    
    .book-info-section {
        padding: var(--space-4);
    }
    
    .metadata-grid {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    
    .related-books-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--space-3);
    }
    
    .related-book-card .book-icon-wrapper {
        height: 100px;
    }
    
    .related-book-card .book-icon {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-lg);
    }
}

@media (max-width: 480px) {
    .related-books-grid {
        grid-template-columns: 1fr;
    }
    
    .book-icon-section .book-icon {
        width: 60px;
        height: 60px;
        font-size: var(--font-size-xl);
    }
}

/* Post Page - Apple Minimalist Styles */
.post-main-full {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
}

.post-content-wrapper {
    max-width: none;
}

.featured-image {
    margin-bottom: var(--space-6);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.post-featured-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.post-featured-img:hover {
    transform: scale(1.01);
}

.post-content {
    margin-bottom: var(--space-8);
    line-height: 1.7;
    font-size: var(--font-size-base);
    color: var(--text-primary);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--space-3);
    margin-top: var(--space-6);
    letter-spacing: -0.01em;
}

.post-content h1 {
    font-size: var(--font-size-3xl);
}

.post-content h2 {
    font-size: var(--font-size-2xl);
}

.post-content h3 {
    font-size: var(--font-size-xl);
}

.post-content p {
    margin-bottom: var(--space-4);
    line-height: 1.7;
}

.post-content ul,
.post-content ol {
    margin-bottom: var(--space-4);
    padding-left: var(--space-6);
}

.post-content li {
    margin-bottom: var(--space-2);
}

.post-content blockquote {
    border-left: 4px solid var(--primary);
    padding-left: var(--space-4);
    margin: var(--space-6) 0;
    font-style: italic;
    color: var(--text-secondary);
    background-color: var(--white-soft);
    padding: var(--space-4);
    border-radius: var(--radius-md);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--space-4) 0;
}

.post-content pre {
    background-color: var(--white-soft);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--space-4) 0;
    border: 1px solid var(--border-light);
}

.post-content code {
    background-color: var(--white-soft);
    padding: 2px var(--space-1);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--primary);
}

.post-tags {
    margin-bottom: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-light);
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag {
    padding: 4px var(--space-2);
    background-color: var(--white-soft);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: var(--font-size-xs);
    font-weight: 400;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.tag:hover {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.post-share-minimal {
    margin-bottom: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-light);
}

.share-buttons-minimal {
    display: flex;
    gap: var(--space-2);
    justify-content: center;
}

.share-btn-minimal {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
    background-color: var(--white);
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.share-btn-minimal:hover {
    border-color: var(--border-medium);
    color: var(--text-secondary);
    transform: translateY(-1px);
}

.share-btn-minimal.facebook:hover {
    background-color: #1877F2;
    color: var(--text-inverse);
    border-color: #1877F2;
}

.share-btn-minimal.twitter:hover {
    background-color: #1DA1F2;
    color: var(--text-inverse);
    border-color: #1DA1F2;
}

.share-btn-minimal.linkedin:hover {
    background-color: #0077B5;
    color: var(--text-inverse);
    border-color: #0077B5;
}

.post-attachments-section {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-8);
}

.attachment-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-3);
}

.attachment-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background-color: var(--white-soft);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.attachment-item:hover {
    border-color: var(--border-medium);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.attachment-icon {
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.attachment-details {
    flex: 1;
    min-width: 0;
}

.attachment-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    font-size: var(--font-size-sm);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.attachment-description {
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-1);
}

.attachment-meta {
    display: flex;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.attachment-actions {
    flex-shrink: 0;
}

.attachment-actions .btn {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-sm);
}

.related-posts {
    margin-top: var(--space-10);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-light);
}

.related-posts .section-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-4);
}

.related-post-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.related-post-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.post-image-wrapper {
    height: 200px;
    overflow: hidden;
    background-color: var(--white-soft);
}

.post-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.related-post-card:hover .post-image {
    transform: scale(1.05);
}

.post-info {
    padding: var(--space-4);
}

.post-title {
    margin-bottom: var(--space-3);
}

.post-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.3;
}

.post-title a:hover {
    color: var(--primary);
}

.post-meta {
    margin-bottom: var(--space-3);
}

.post-date {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.post-date i {
    color: var(--text-tertiary);
}

/* Responsive Design for Post Page */
@media (max-width: 768px) {
    .post-main-full {
        padding: var(--space-4);
    }
    
    .post-attachments-section {
        padding: var(--space-3);
    }
    
    .attachment-item {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .attachment-details {
        margin-bottom: var(--space-2);
    }
    
    .related-posts-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--space-3);
    }
    
    .post-image-wrapper {
        height: 160px;
    }
}

@media (max-width: 480px) {
    .related-posts-grid {
        grid-template-columns: 1fr;
    }
    
    .share-buttons-minimal {
        justify-content: center;
    }
    
    .tags-list {
        justify-content: center;
    }
}

/* Accordion Styles */
.accordion-item {
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-2);
    overflow: hidden;
    background-color: var(--white);
    transition: var(--transition);
}

.accordion-item:hover {
    border-color: var(--primary-light);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.08);
}

/* Clickable Accordion Items */
.clickable-accordion-item {
    cursor: pointer;
    transition: all 0.3s ease;
}

.clickable-accordion-item:hover {
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.12);
    transform: translateY(-1px);
}

.clickable-accordion-item .accordion-button:focus {
    box-shadow: none;
}

/* Methodology Accordion */
.methodology-accordion .accordion-button {
    background-color: var(--white);
    border: none;
    padding: var(--space-4);
    font-weight: 500;
    color: var(--text-primary);
}

.methodology-accordion .accordion-button:not(.collapsed) {
    background-color: var(--white);
    color: var(--primary);
}

.methodology-accordion .accordion-button::after {
    display: none;
}

.methodology-toggle {
    margin-right: var(--space-3);
    color: var(--primary);
    transition: var(--transition);
}

.methodology-accordion .accordion-button:not(.collapsed) .methodology-toggle i {
    transform: rotate(45deg);
}

/* FAQ Accordion */
.faq-accordion .accordion-button {
    background-color: var(--white);
    border: none;
    padding: var(--space-4);
    font-weight: 500;
    color: var(--text-primary);
}

.faq-accordion .accordion-button:not(.collapsed) {
    background-color: var(--white);
    color: var(--primary);
}

.faq-accordion .accordion-button::after {
    display: none;
}

.faq-toggle {
    margin-right: var(--space-3);
    color: var(--primary);
    transition: var(--transition);
}

.faq-accordion .accordion-button:not(.collapsed) .faq-toggle i {
    transform: rotate(45deg);
}

/* Accordion Body */
.accordion-body {
    padding: var(--space-4);
    background-color: var(--white);
    border-top: 1px solid var(--border-light);
}

.methodology-content-text,
.faq-answer-text {
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Responsive Accordion */
@media (max-width: 768px) {
    .accordion-button {
        padding: var(--space-3);
        font-size: var(--font-size-sm);
    }
    
    .accordion-body {
        padding: var(--space-3);
    }
    
    .methodology-toggle,
    .faq-toggle {
        margin-right: var(--space-2);
    }
}

@media (max-width: 480px) {
    .accordion-button {
        padding: var(--space-2);
        font-size: var(--font-size-sm);
    }
    
    .accordion-body {
        padding: var(--space-2);
    }
}

/* Subject Badges - Apple Style */
.subject-badges {
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-4);
    flex-wrap: wrap;
}

.level-badge,
.subject-type-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.level-badge.undergraduate {
    background-color: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-light);
}

.level-badge.graduate {
    background-color: rgba(52, 199, 89, 0.1);
    color: #34C759;
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.level-badge.doctoral {
    background-color: rgba(175, 82, 222, 0.1);
    color: #AF52DE;
    border: 1px solid rgba(175, 82, 222, 0.2);
}

.subject-type-badge.mandatory {
    background-color: rgba(255, 149, 0, 0.1);
    color: #FF9500;
    border: 1px solid rgba(255, 149, 0, 0.2);
}

.subject-type-badge.elective {
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--primary);
    border: 1px solid rgba(0, 122, 255, 0.2);
}

/* Responsive Badge Styles */
@media (max-width: 768px) {
    .subject-badges {
        gap: var(--space-2);
        margin-top: var(--space-3);
    }
    
    .level-badge,
    .subject-type-badge {
        padding: var(--space-1) var(--space-3);
        font-size: var(--font-size-xs);
    }
}

@media (max-width: 480px) {
    .subject-badges {
        flex-direction: column;
        align-items: center;
        gap: var(--space-2);
    }
    
    .level-badge,
    .subject-type-badge {
        padding: var(--space-1) var(--space-4);
        font-size: var(--font-size-xs);
        min-width: 120px;
        justify-content: center;
    }
}

/* Topics Page - Apple Style */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.topic-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: var(--transition);
    height: 100%;
}

.topic-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.12);
    transform: translateY(-2px);
}

.topic-icon-wrapper {
    position: relative;
    margin-bottom: var(--space-3);
}

.topic-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 24px;
    transition: var(--transition);
}

.topic-card:hover .topic-icon {
    background-color: var(--primary);
    color: var(--white);
    transform: scale(1.1);
}

.topic-badges {
    position: absolute;
    top: -8px;
    right: -8px;
}

.topic-badges .badge {
    font-size: 10px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.topic-badges .badge.difficulty.beginner {
    background-color: rgba(52, 199, 89, 0.1);
    color: #34C759;
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.topic-badges .badge.difficulty.intermediate {
    background-color: rgba(255, 149, 0, 0.1);
    color: #FF9500;
    border: 1px solid rgba(255, 149, 0, 0.2);
}

.topic-badges .badge.difficulty.advanced {
    background-color: rgba(255, 59, 48, 0.1);
    color: #FF3B30;
    border: 1px solid rgba(255, 59, 48, 0.2);
}

.topic-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.topic-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.topic-title a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.topic-title a:hover {
    color: var(--primary);
}

.topic-description {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    margin-bottom: var(--space-3);
    flex: 1;
}

.topic-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.topic-meta .meta-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.topic-meta .meta-item i {
    color: var(--primary);
    width: 16px;
}

.topic-actions {
    margin-top: auto;
}

/* Responsive Topics */
@media (max-width: 768px) {
    .topics-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: var(--space-3);
    }
    
    .topic-card {
        padding: var(--space-3);
    }
    
    .topic-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .topics-grid {
        grid-template-columns: 1fr;
    }
    
    .topic-card {
        padding: var(--space-3);
    }
    
    .topic-icon {
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
    
    .topic-meta {
        gap: var(--space-1);
    }
}