/* QuickRef - Enhanced Dark/Light Theme with Improved Readability */

/* Light Theme (Default) */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-code: #f8f9fa;
    --bg-code-dark: #1e1e1e;
    --bg-nav: #212529;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f9fa;
    --bg-accent: #e3f2fd;
    --bg-warning: #fff3cd;
    --bg-success: #d4edda;
    --bg-danger: #f8d7da;
    
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #868e96;
    --text-inverse: #ffffff;
    --text-code: #d73a49;
    --text-link: #0d6efd;
    --text-heading: #1a1a1a;
    
    --border-primary: #dee2e6;
    --border-secondary: #e9ecef;
    --border-accent: #0d6efd;
    --border-light: #f1f3f4;
    
    --accent-primary: #0d6efd;
    --accent-secondary: #6f42c1;
    --accent-success: #198754;
    --accent-warning: #fd7e14;
    --accent-danger: #dc3545;
    --accent-info: #0dcaf0;
    
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    
    --radius-xs: 0.125rem;
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'SF Pro Display', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

/* Enhanced Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0a0c10;
    --bg-secondary: #111419;
    --bg-tertiary: #1a1f26;
    --bg-code: #161b22;
    --bg-code-dark: #0d1117;
    --bg-nav: #000408;
    --bg-card: #111419;
    --bg-card-hover: #1a1f26;
    --bg-accent: #0f1419;
    --bg-warning: #2d1b05;
    --bg-success: #0f1b0f;
    --bg-danger: #2b0e0e;
    
    --text-primary: #f0f6fc;
    --text-secondary: #8d96a0;
    --text-muted: #656d76;
    --text-inverse: #0a0c10;
    --text-code: #ff7b72;
    --text-link: #58a6ff;
    --text-heading: #ffffff;
    
    --border-primary: #21262d;
    --border-secondary: #30363d;
    --border-accent: #1f6feb;
    --border-light: #262c36;
    
    --accent-primary: #1f6feb;
    --accent-secondary: #a855f7;
    --accent-success: #238636;
    --accent-warning: #d29922;
    --accent-danger: #f85149;
    --accent-info: #58a6ff;
    
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4), 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5), 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6), 0 10px 10px rgba(0, 0, 0, 0.4);
}

/* Base Styles with Enhanced Typography */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    font-feature-settings: 'kern' 1, 'liga' 1, 'frac' 1, 'case' 1;
    overflow-x: hidden;
}

/* Enhanced Navigation */
.navbar {
    background: linear-gradient(135deg, var(--bg-nav) 0%, rgba(0, 0, 0, 0.8) 100%) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-primary);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-inverse) !important;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #58a6ff, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all var(--transition-normal);
}

.navbar-brand:hover {
    transform: translateY(-1px);
    filter: brightness(1.1);
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: all var(--transition-normal);
    border-radius: var(--radius-md);
    position: relative;
}

.nav-link:hover {
    color: var(--text-inverse) !important;
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

/* Enhanced Theme Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    padding: 0.5rem 0.875rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.theme-toggle::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.theme-toggle:hover::before {
    left: 100%;
}

.theme-toggle:hover {
    background: var(--accent-primary);
    color: var(--text-inverse);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

/* Enhanced Header Section */
.header-section {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-primary);
    padding: 3rem 0;
    position: relative;
    overflow: hidden;
}

.header-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--accent-primary)10, transparent 50%);
    animation: float 6s ease-in-out infinite;
    opacity: 0.1;
}

@keyframes float {
    0%, 100% { transform: translate(-50%, -50%) rotate(0deg); }
    50% { transform: translate(-50%, -50%) rotate(180deg); }
}

.header-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.header-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.5;
    font-weight: 400;
    opacity: 0.9;
}

/* Enhanced Search with Floating Effect */
.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: 1rem 1.25rem;
    padding-right: 3.5rem;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(31, 111, 235, 0.15), var(--shadow-md);
    transform: translateY(-2px);
}

.search-input::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.search-btn {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--accent-primary);
    border: none;
    color: var(--text-inverse);
    padding: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.search-btn:hover {
    background: var(--accent-secondary);
    transform: translateY(-50%) scale(1.05);
    box-shadow: var(--shadow-md);
}

/* Enhanced Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 1rem;
}

/* Masonry Grid Layout */
.category-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
    align-items: start;
}

/* Mobile - keep simple grid */
@media (max-width: 767px) {
    .category-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 2rem;
        position: static !important;
        height: auto !important;
    }
    
    .category-section {
        position: static !important;
        width: auto !important;
        left: auto !important;
        top: auto !important;
    }
}

/* Tablet and Desktop - use JavaScript masonry */
@media (min-width: 768px) {
    .category-grid {
        position: relative;
        /* Grid properties will be overridden by JavaScript */
    }
}

.category-section {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    height: fit-content;
    align-self: start;
}


.category-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.category-section:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-accent);
}

.category-section:hover::before {
    transform: scaleX(1);
}

.category-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-secondary);
}

.category-icon {
    width: 2.5rem;
    height: 2.5rem;
    margin-right: 1rem;
    color: var(--accent-primary);
    filter: drop-shadow(0 2px 4px rgba(31, 111, 235, 0.3));
    transition: all var(--transition-normal);
}

.category-section:hover .category-icon {
    transform: scale(1.1) rotate(5deg);
    filter: drop-shadow(0 4px 8px rgba(31, 111, 235, 0.4));
}

.category-title {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-heading);
    margin: 0;
    letter-spacing: -0.01em;
}

.category-count {
    margin-left: auto;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-inverse);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-xs);
    min-width: 2rem;
    text-align: center;
}

/* Enhanced Cards Grid with Dynamic Sizing */
.cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-top: 1.5rem;
    align-items: start;
}

/* Small categories (1-4 items) - single column on mobile, adaptive on larger screens */
.category-section[data-item-count="1"] .cards-grid,
.category-section[data-item-count="2"] .cards-grid,
.category-section[data-item-count="3"] .cards-grid,
.category-section[data-item-count="4"] .cards-grid {
    grid-template-columns: 1fr;
}

/* Medium categories (5-8 items) */
.category-section[data-item-count="5"] .cards-grid,
.category-section[data-item-count="6"] .cards-grid,
.category-section[data-item-count="7"] .cards-grid,
.category-section[data-item-count="8"] .cards-grid {
    grid-template-columns: 1fr;
}

/* Large categories (9+ items) */
.category-section[data-item-count="9"] .cards-grid,
.category-section[data-item-count="10"] .cards-grid,
.category-section[data-item-count="11"] .cards-grid,
.category-section[data-item-count="12"] .cards-grid,
.category-section[data-item-count="13"] .cards-grid,
.category-section[data-item-count="14"] .cards-grid,
.category-section[data-item-count="15"] .cards-grid {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    /* Medium categories get 2 columns on tablet+ */
    .category-section[data-item-count="5"] .cards-grid,
    .category-section[data-item-count="6"] .cards-grid,
    .category-section[data-item-count="7"] .cards-grid,
    .category-section[data-item-count="8"] .cards-grid,
    .category-section[data-item-count="9"] .cards-grid,
    .category-section[data-item-count="10"] .cards-grid,
    .category-section[data-item-count="11"] .cards-grid,
    .category-section[data-item-count="12"] .cards-grid,
    .category-section[data-item-count="13"] .cards-grid,
    .category-section[data-item-count="14"] .cards-grid,
    .category-section[data-item-count="15"] .cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }
}

@media (min-width: 1200px) {
    /* Large categories get 3 columns on desktop */
    .category-section[data-item-count="9"] .cards-grid,
    .category-section[data-item-count="10"] .cards-grid,
    .category-section[data-item-count="11"] .cards-grid,
    .category-section[data-item-count="12"] .cards-grid,
    .category-section[data-item-count="13"] .cards-grid,
    .category-section[data-item-count="14"] .cards-grid,
    .category-section[data-item-count="15"] .cards-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
}

.quickref-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xs);
}

.quickref-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-info));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.quickref-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-accent);
    text-decoration: none;
    color: inherit;
}

.quickref-card:hover::before {
    transform: scaleX(1);
}

.quickref-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.quickref-card-icon {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.5rem;
    color: var(--accent-primary);
    flex-shrink: 0;
    transition: all var(--transition-normal);
}

.quickref-card:hover .quickref-card-icon {
    transform: scale(1.1);
    filter: drop-shadow(0 2px 4px rgba(31, 111, 235, 0.3));
}

.quickref-card-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.quickref-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.quickref-tag {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    line-height: 1.2;
    border: 1px solid var(--border-secondary);
}

.quickref-card:hover .quickref-tag {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-inverse);
    transform: translateY(-1px);
    box-shadow: var(--shadow-xs);
}

/* Enhanced Reference Page Styles */
.ref-page {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem;
}

.ref-header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: 3rem;
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.ref-header::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    z-index: -1;
    border-radius: var(--radius-2xl);
}

.ref-title {
    color: var(--text-heading);
    font-weight: 800;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.ref-description {
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
    font-weight: 400;
}

.ref-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.ref-tag {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-inverse);
    padding: 0.375rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

/* Enhanced Content Styling */
.ref-content {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: 3rem;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.ref-content h2 {
    color: var(--text-heading);
    font-weight: 700;
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    margin-top: 3rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--accent-primary);
    letter-spacing: -0.01em;
    position: relative;
}

.ref-content h2:first-child {
    margin-top: 0;
}

.ref-content h2::before {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-secondary), var(--accent-primary));
    border-radius: var(--radius-sm);
}

.ref-content h3 {
    color: var(--text-heading);
    font-weight: 700;
    font-size: 1.375rem;
    margin-bottom: 1.25rem;
    margin-top: 2rem;
    border-left: 4px solid var(--accent-primary);
    padding-left: 1.25rem;
    position: relative;
}

.ref-content h3::before {
    content: '';
    position: absolute;
    left: -4px;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.ref-content h4 {
    color: var(--text-heading);
    font-weight: 650;
    font-size: 1.125rem;
    margin-bottom: 1rem;
    margin-top: 1.5rem;
    position: relative;
    padding-left: 0.75rem;
}

.ref-content h4::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-size: 0.75rem;
    top: 0.2rem;
}

.ref-content h5 {
    color: var(--text-heading);
    font-weight: 650;
    font-size: 1rem;
    margin-bottom: 0.75rem;
    margin-top: 1.25rem;
}

/* Enhanced Code Blocks */
.ref-content pre {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%);
    color: #f0f6fc;
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    margin: 2rem 0;
    overflow-x: auto;
    position: relative;
    border: 1px solid var(--border-secondary);
    box-shadow: var(--shadow-lg);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
    font-weight: 400;
    backdrop-filter: blur(10px);
}

.ref-content pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
}

.ref-content pre code {
    background: none;
    color: inherit;
    padding: 0;
    border: none;
    font-size: inherit;
    font-family: inherit;
    white-space: pre;
    word-spacing: normal;
    word-break: normal;
    word-wrap: normal;
}

/* Enhanced Inline Code */
.ref-content code {
    background: linear-gradient(135deg, var(--bg-code), var(--bg-tertiary));
    color: var(--text-code);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    border: 1px solid var(--border-secondary);
    font-weight: 600;
    box-shadow: var(--shadow-xs);
}

[data-theme="dark"] .ref-content code {
    background: linear-gradient(135deg, var(--bg-tertiary), #1a1f26);
    color: #ff7b72;
    border-color: var(--border-primary);
}

/* Enhanced Math and Special Content */
.ref-content .math-block {
    background: linear-gradient(135deg, var(--bg-accent), var(--bg-secondary));
    border: 1px solid var(--border-secondary);
    border-left: 4px solid var(--accent-success);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: var(--radius-xl);
    font-family: var(--font-mono);
    text-align: center;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.ref-content .math-block::before {
    content: '∫';
    position: absolute;
    top: 0.5rem;
    right: 1rem;
    font-size: 1.5rem;
    color: var(--accent-success);
    opacity: 0.3;
}

/* Enhanced Tables */
.ref-content table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 2rem 0;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.ref-content table th,
.ref-content table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-secondary);
}

.ref-content table th {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    font-weight: 700;
    color: var(--text-heading);
    position: relative;
}

.ref-content table td {
    background: var(--bg-card);
    color: var(--text-secondary);
    transition: background-color var(--transition-normal);
}

.ref-content table tr:hover td {
    background: var(--bg-card-hover);
}

.ref-content table th:first-child {
    border-top-left-radius: var(--radius-xl);
}

.ref-content table th:last-child {
    border-top-right-radius: var(--radius-xl);
}

/* Enhanced Lists */
.ref-content ul,
.ref-content ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.ref-content li {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.ref-content li::marker {
    color: var(--accent-primary);
}

.ref-content li strong {
    color: var(--text-heading);
    font-weight: 650;
}

/* Enhanced Blockquotes */
.ref-content blockquote {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-accent));
    border: 1px solid var(--border-primary);
    border-left: 4px solid var(--accent-primary);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.ref-content blockquote::before {
    content: '"';
    position: absolute;
    top: -0.5rem;
    left: 1rem;
    font-size: 3rem;
    color: var(--accent-primary);
    opacity: 0.3;
    line-height: 1;
}

.ref-content blockquote p {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 1.05rem;
    line-height: 1.7;
}

/* Enhanced Special Boxes */
.ref-content .warning {
    background: linear-gradient(135deg, var(--bg-danger), rgba(248, 81, 73, 0.05));
    border: 1px solid var(--accent-danger);
    border-left: 4px solid var(--accent-danger);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.ref-content .warning::before {
    content: "⚠️ ";
    font-size: 1.25rem;
    margin-right: 0.5rem;
}

.ref-content .correct {
    background: linear-gradient(135deg, var(--bg-success), rgba(35, 134, 54, 0.05));
    border: 1px solid var(--accent-success);
    border-left: 4px solid var(--accent-success);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.ref-content .correct::before {
    content: "✅ ";
    font-size: 1.25rem;
    margin-right: 0.5rem;
}

/* Enhanced Back Link */
.back-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-accent);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-xs);
}

.back-link:hover {
    background: var(--accent-primary);
    color: var(--text-inverse);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.back-link i {
    margin-right: 0.5rem;
    transition: transform var(--transition-normal);
}

.back-link:hover i {
    transform: translateX(-2px);
}

/* Copy Code Button */
.copy-code-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    cursor: pointer;
    opacity: 0.7;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

.copy-code-btn:hover {
    background: var(--accent-primary);
    color: var(--text-inverse);
    opacity: 1;
    transform: translateY(-1px);
}

/* Enhanced Footer */
footer {
    background: linear-gradient(135deg, var(--bg-nav) 0%, rgba(0, 0, 0, 0.9) 100%);
    color: var(--text-secondary);
    text-align: center;
    padding: 3rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-primary);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

/* Enhanced Typography */
.ref-content p {
    margin-bottom: 1.25rem;
    line-height: 1.75;
    color: var(--text-secondary);
    font-size: 1rem;
}

.ref-content strong {
    color: var(--text-heading);
    font-weight: 650;
}

.ref-content em {
    font-style: italic;
    color: var(--text-secondary);
}

.ref-content a {
    color: var(--text-link);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-normal);
    border-bottom: 1px solid transparent;
}

.ref-content a:hover {
    color: var(--accent-secondary);
    border-bottom-color: var(--accent-secondary);
    text-decoration: none;
}

/* Enhanced Focus States */
.ref-content a:focus,
.back-link:focus,
.quickref-card:focus,
.theme-toggle:focus,
.search-input:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: var(--radius-md);
}

/* Enhanced Responsive Design */
@media (max-width: 480px) {
    .main-content {
        padding: 1.5rem 0.75rem;
    }
    
    .category-section {
        padding: 1.25rem;
    }
    
    .category-grid {
        gap: 1.5rem;
    }
    
    .quickref-card {
        padding: 0.875rem;
    }
    
    .ref-header {
        padding: 1.5rem;
    }
    
    .ref-content {
        padding: 1.5rem;
    }
    
    .search-input {
        padding: 0.875rem 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 768px) {
    .header-section {
        padding: 2rem 0;
    }
    
    .header-title {
        font-size: clamp(1.75rem, 6vw, 2.25rem);
    }
    
    .header-subtitle {
        font-size: 1.125rem;
    }
    
    .main-content {
        padding: 2rem 1rem;
    }
    
    .category-section {
        padding: 1.5rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    /* Override all grid layouts to single column on mobile */
    .cards-grid,
    .category-section[data-item-count] .cards-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem;
    }
    
    /* Ensure categories use normal flow on mobile */
    .category-section {
        position: static !important;
        width: auto !important;
        left: auto !important;
        top: auto !important;
    }
    
    .quickref-card {
        padding: 1rem;
    }
    
    .ref-header {
        padding: 2rem;
    }
    
    .ref-content {
        padding: 2rem;
    }
    
    .ref-content pre {
        padding: 1rem;
        font-size: 0.875rem;
        border-radius: var(--radius-lg);
        margin: 1.5rem -0.5rem;
    }
    
    .navbar-nav {
        flex-direction: column;
        gap: 0.5rem;
        margin-top: 1rem;
    }
    
    .theme-toggle {
        margin-top: 1rem;
        align-self: flex-start;
    }
}

/* Tablet specific optimizations */
@media (min-width: 769px) and (max-width: 1199px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .main-content {
        padding: 2.5rem 1.5rem;
    }
    
    /* Optimize for tablet - ensure larger categories use available space */
    .category-section[data-item-count="7"] .cards-grid,
    .category-section[data-item-count="8"] .cards-grid,
    .category-section[data-item-count="9"] .cards-grid,
    .category-section[data-item-count="10"] .cards-grid,
    .category-section[data-item-count="11"] .cards-grid,
    .category-section[data-item-count="12"] .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


/* Print Styles */
@media print {
    .navbar,
    .theme-toggle,
    .search-container,
    .back-link,
    .copy-code-btn,
    footer {
        display: none;
    }
    
    .ref-page {
        max-width: none;
        padding: 0;
    }
    
    .ref-header,
    .ref-content {
        border: none;
        box-shadow: none;
        background: white !important;
    }
    
    .ref-content pre {
        border: 1px solid #ccc;
        background: #f8f9fa !important;
        color: #212529 !important;
    }
    
    .ref-content code {
        background: #f8f9fa !important;
        color: #212529 !important;
    }
    
    .ref-content h2,
    .ref-content h3,
    .ref-content h4,
    .ref-content h5 {
        color: #212529 !important;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-primary: #000000;
        --border-secondary: #333333;
        --text-primary: #000000;
        --text-secondary: #333333;
    }
    
    [data-theme="dark"] {
        --border-primary: #ffffff;
        --border-secondary: #cccccc;
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
    }
}

/* Smooth scrolling for better UX */
html {
    scroll-padding-top: 100px;
}

.ref-content h2[id],
.ref-content h3[id],
.ref-content h4[id] {
    scroll-margin-top: 100px;
}

/* Enhanced YouTube iframe styling */
.ref-content iframe {
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    margin: 2rem 0;
    max-width: 100%;
    height: auto;
    aspect-ratio: 16/9;
}

/* Loading states */
.loading {
    opacity: 0.7;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

/* Selection styling */
::selection {
    background: rgba(31, 111, 235, 0.3);
    color: var(--text-primary);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: var(--radius-lg);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}