/* ============================================
   Richards Systems Wiki - Main Stylesheet
   ============================================ */

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

:root {
    --color-bg: #fafbfc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-accent: #0369a1;
    --color-accent-light: #e0f2fe;
    --color-accent-hover: #0284c7;
    --color-socialize: #22c55e;
    --color-decode: #f97316;
    --color-consult: #a855f7;
    --color-sidebar-bg: #f8fafc;
    --color-sidebar-hover: #f1f5f9;
    --color-sidebar-active: #e0f2fe;
    --sidebar-width: 300px;
    --header-height: 64px;
    --footer-height: auto;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.2s ease;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

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

/* ============================================
   Layout Structure
   ============================================ */

.site-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-body {
    display: flex;
    flex: 1;
    margin-top: var(--header-height);
}

/* ============================================
   Header
   ============================================ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: white;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 1.5rem;
    max-width: 100%;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.sidebar-toggle:hover {
    background: rgba(255,255,255,0.1);
}

.sidebar-toggle svg {
    width: 24px;
    height: 24px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: white;
}

.site-logo:hover {
    text-decoration: none;
    color: white;
}

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.logo-image {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.site-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: #38bdf8;
    letter-spacing: -0.02em;
}

.site-subtitle {
    font-size: 0.75rem;
    color: var(--color-text-light);
    font-weight: 400;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.header-nav {
    display: flex;
    gap: 0.5rem;
}

.header-nav-link {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.header-nav-link:hover {
    text-decoration: none;
}

.header-nav-link.socialize:hover {
    background: rgba(34, 197, 94, 0.15);
    color: var(--color-socialize);
}

.header-nav-link.decode:hover {
    background: rgba(249, 115, 22, 0.15);
    color: var(--color-decode);
}

.header-nav-link.consult:hover {
    background: rgba(168, 85, 247, 0.15);
    color: var(--color-consult);
}

/* ============================================
   Sidebar Navigation
   ============================================ */

.site-sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--color-sidebar-bg);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 900;
    transition: transform 0.3s ease;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.site-sidebar::-webkit-scrollbar {
    width: 5px;
}

.site-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.site-sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.sidebar-content {
    padding: 1rem 0;
}

/* Sidebar Search */
.sidebar-search {
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    background: var(--color-sidebar-bg);
    z-index: 10;
    border-bottom: 1px solid var(--color-border-light);
}

.search-input-wrapper {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-family: var(--font-sans);
    background: var(--color-surface);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(3, 105, 161, 0.1);
}

.search-input::placeholder {
    color: var(--color-text-light);
}

.search-icon {
    position: absolute;
    left: 0.65rem;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    color: var(--color-text-light);
    pointer-events: none;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 320px;
    overflow-y: auto;
    display: none;
    z-index: 100;
}

.search-results.active {
    display: block;
}

.search-result-item {
    display: block;
    padding: 0.6rem 0.85rem;
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.82rem;
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition);
}

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

.search-result-item:hover {
    background: var(--color-accent-light);
    text-decoration: none;
    color: var(--color-accent);
}

.search-result-item .result-title {
    font-weight: 500;
    margin-bottom: 0.15rem;
}

.search-result-item .result-path {
    font-size: 0.72rem;
    color: var(--color-text-light);
}

.search-no-results {
    padding: 0.75rem 0.85rem;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    text-align: center;
}

.sidebar-section {
    margin-bottom: 0.5rem;
}

.sidebar-section-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding: 0.5rem 1.25rem;
    margin-top: 0.5rem;
}

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

.nav-tree .nav-tree {
    padding-left: 0.75rem;
    border-left: 1px solid var(--color-border-light);
    margin-left: 1.25rem;
    display: none;
}

.nav-tree .nav-tree.expanded {
    display: block;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1.25rem;
    font-size: 0.85rem;
    color: var(--color-text);
    text-decoration: none;
    border-radius: 0;
    transition: all var(--transition);
    line-height: 1.4;
    word-break: break-word;
}

.nav-link:hover {
    background: var(--color-sidebar-hover);
    color: var(--color-accent);
    text-decoration: none;
}

.nav-link.active {
    background: var(--color-sidebar-active);
    color: var(--color-accent);
    font-weight: 500;
}

.nav-link .external-icon {
    width: 12px;
    height: 12px;
    opacity: 0.5;
    flex-shrink: 0;
}

/* Popular page indicators in sidebar */
.nav-link.popular {
    font-weight: 500;
}

.nav-link.popular::after {
    content: '';
    width: 6px;
    height: 6px;
    background: #f59e0b;
    border-radius: 50%;
    margin-left: auto;
    flex-shrink: 0;
    box-shadow: 0 0 4px rgba(245, 158, 11, 0.4);
}

.nav-link.popular span {
    color: #92400e;
}

.nav-link.popular:hover span {
    color: var(--color-accent);
}

/* Popular link items on folder pages */
.link-item-popular {
    border-color: #fde68a;
    background: #fffbeb;
    font-weight: 600;
}

.link-item-popular .link-dot {
    background: #f59e0b;
    width: 10px;
    height: 10px;
    box-shadow: 0 0 5px rgba(245, 158, 11, 0.4);
}

.link-item-popular:hover {
    border-color: #f59e0b;
    background: #fef3c7;
}

/* Popular pages grid (homepage bottom) */
.popular-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.popular-card {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, #fffbeb 0%, #ffffff 100%);
    border: 1px solid #fde68a;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.2s ease;
}

.popular-card:hover {
    border-color: #f59e0b;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.15);
    transform: translateY(-2px);
    text-decoration: none;
}

.popular-views {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #b45309;
    background: #fef3c7;
    padding: 0.15rem 0.45rem;
    border-radius: 3px;
    width: fit-content;
}

.popular-title {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.3;
}

.popular-card:hover .popular-title {
    color: #92400e;
}

.nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--color-text-muted);
    border-radius: 3px;
    transition: all var(--transition);
    flex-shrink: 0;
}

.nav-toggle:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.nav-toggle svg {
    width: 14px;
    height: 14px;
    transition: transform 0.2s ease;
}

.nav-toggle.expanded svg {
    transform: rotate(90deg);
}

/* ============================================
   Main Content Area
   ============================================ */

.site-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.content-wrapper {
    flex: 1;
    max-width: 860px;
    margin: 0 auto;
    padding: 2.5rem 3rem;
    width: 100%;
}

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 1.5rem;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    flex-wrap: wrap;
}

.breadcrumbs a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

.breadcrumbs a:hover {
    color: var(--color-accent);
}

.breadcrumbs .separator {
    color: var(--color-text-light);
    font-size: 0.75rem;
}

/* Page Title */
.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.03em;
    line-height: 1.3;
    margin-bottom: 0.5rem;
}

.page-meta {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border-light);
}

/* Article Content */
.article-content {
    font-size: 1rem;
    line-height: 1.8;
    color: #334155;
}

.article-content h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2.5rem 0 1rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.article-content h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 2rem 0 0.75rem;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.article-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 1.5rem 0 0.5rem;
    color: var(--color-text);
}

.article-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 1.25rem 0 0.5rem;
    color: var(--color-text);
}

.article-content p {
    margin-bottom: 1rem;
}

.article-content ul, .article-content ol {
    margin: 0.75rem 0 1rem 1.5rem;
}

.article-content li {
    margin-bottom: 0.4rem;
}

.article-content blockquote {
    border-left: 3px solid var(--color-accent);
    padding: 0.75rem 1.25rem;
    margin: 1.5rem 0;
    background: var(--color-accent-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: #0c4a6e;
    font-style: italic;
}

.article-content img {
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
}

.article-content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    margin: 1.5rem 0;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--color-border-light);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    color: #be185d;
}

.article-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.9rem;
}

.article-content th, .article-content td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    text-align: left;
}

.article-content th {
    background: var(--color-border-light);
    font-weight: 600;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2rem 0;
}

/* Video embeds */
.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    box-shadow: var(--shadow-md);
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* PDF embed */
.pdf-embed {
    width: 100%;
    height: 80vh;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

/* External link card */
.external-link-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin: 1.5rem 0;
    transition: all var(--transition);
    text-decoration: none;
    color: var(--color-text);
}

.external-link-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    transform: translateY(-1px);
}

.external-link-card .link-icon {
    width: 40px;
    height: 40px;
    background: var(--color-accent-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.external-link-card .link-icon svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

.external-link-card .link-text {
    flex: 1;
}

.external-link-card .link-title {
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.external-link-card .link-url {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* ============================================
   Homepage Specific
   ============================================ */

.home-hero {
    text-align: center;
    padding: 3rem 0 2rem;
    border-bottom: 1px solid var(--color-border-light);
    margin-bottom: 2.5rem;
}

.home-logo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-md);
    border: 3px solid var(--color-border-light);
}

.home-hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-hero .subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto 1rem;
    line-height: 1.6;
}

.home-hero .subtitle .hero-link {
    color: var(--color-accent);
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.home-hero .contact-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1.25rem;
    font-size: 0.9rem;
}

.home-hero .contact-info a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--color-accent-light);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    font-weight: 500;
    transition: all var(--transition);
}

.home-hero .contact-info a:hover {
    background: var(--color-accent);
    color: white;
    text-decoration: none;
}

/* Homepage search bar */
.home-search {
    max-width: 420px;
    margin: 1.5rem auto 0;
}

.home-search .search-input-wrapper {
    position: relative;
}

.home-search .search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.75rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    font-family: var(--font-sans);
    background: var(--color-surface);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    box-shadow: var(--shadow-sm);
}

.home-search .search-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 4px rgba(3, 105, 161, 0.1), var(--shadow-md);
}

.home-search .search-icon {
    left: 0.9rem;
    width: 18px;
    height: 18px;
}

.home-search .search-results {
    border-radius: var(--radius-lg);
    margin-top: 6px;
    text-align: left;
}

/* Topic grid */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0 2.5rem;
}

.topic-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--transition);
}

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

.topic-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.topic-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.topic-card li {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: 0.2rem 0;
}

/* Section cards on homepage */
.home-section {
    margin-bottom: 2.5rem;
}

.section-heading {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-accent-light);
}

/* ============================================
   Featured Books Section
   ============================================ */

.books-feature {
    margin: 2.5rem -1rem;
    padding: 2rem;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-radius: var(--radius-lg);
    color: white;
}

.books-feature-inner {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.books-image-link {
    flex-shrink: 0;
}

.books-image {
    width: 200px;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    transition: transform 0.3s ease;
}

.books-image-link:hover .books-image {
    transform: scale(1.03);
}

.books-content {
    flex: 1;
}

.books-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #fbbf24;
}

.books-tagline {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.books-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.book-item {
    padding: 0.75rem 1rem;
    background: rgba(255,255,255,0.05);
    border-left: 3px solid #fbbf24;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.book-item strong {
    display: block;
    font-size: 0.88rem;
    color: #fde68a;
    margin-bottom: 0.25rem;
}

.book-item p {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.5;
    margin: 0;
}

.books-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    background: #fbbf24;
    color: #1e293b;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.2s ease;
}

.books-cta:hover {
    background: #f59e0b;
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(251, 191, 36, 0.3);
}

@media (max-width: 768px) {
    .books-feature {
        margin: 2rem -0.5rem;
        padding: 1.5rem;
    }
    
    .books-feature-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .books-image {
        width: 160px;
    }
    
    .book-item {
        text-align: left;
    }
    
    .books-cta {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   Video Feature Section
   ============================================ */

.video-feature {
    margin: 2.5rem 0;
    text-align: center;
}

.video-feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.video-feature-player {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

.video-feature-player video {
    width: 100%;
    height: auto;
    display: block;
    background: #000;
}

/* PDF Feature Section */
.pdf-feature {
    margin: 2.5rem 0;
    text-align: center;
}

.pdf-feature-player {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

.pdf-feature-player iframe {
    width: 100%;
    height: 70vh;
    border: none;
    display: block;
}

.pdf-download {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 0.75rem;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    background: var(--color-accent-light);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition);
}

.pdf-download:hover {
    background: var(--color-accent);
    color: white;
    text-decoration: none;
}

/* ============================================
   Table of Contents
   ============================================ */

/* Table of Contents */
.toc {
    margin: 2.5rem 0;
}

.toc-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--color-text);
}

.toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1rem;
}

.toc-card {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.25s ease;
    align-items: flex-start;
}

.toc-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
}

.toc-icon {
    font-size: 1.8rem;
    line-height: 1;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-light);
    border-radius: var(--radius-md);
}

.toc-card-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    color: var(--color-text);
}

.toc-card-content p {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: 0.4rem;
}

.toc-count {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-accent);
    background: var(--color-accent-light);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

/* Featured TOC card (Allegories) */
.toc-card-featured {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 50%, #fff7ed 100%);
    border: 2px solid #f59e0b;
    grid-column: 1 / -1;
    position: relative;
    overflow: hidden;
}

.toc-card-featured::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.toc-card-featured .toc-icon {
    background: #fef3c7;
    font-size: 2.2rem;
    width: 52px;
    height: 52px;
}

.toc-card-featured .toc-card-content h3 {
    font-size: 1.15rem;
    color: #92400e;
}

.toc-card-featured .toc-count {
    background: #fde68a;
    color: #92400e;
}

.toc-card-featured:hover {
    border-color: #d97706;
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.2);
}

/* Featured links (replacing the plain link-item) */
.featured-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.featured-link {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.85rem 1.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

.featured-link:hover {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
    color: var(--color-accent);
    text-decoration: none;
    transform: translateX(4px);
}

.featured-emoji {
    font-size: 1.3rem;
    line-height: 1;
    flex-shrink: 0;
}

.featured-text {
    font-weight: 500;
}

/* Links grid (used on sub-pages for child page listings) */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0.75rem;
    margin: 1rem 0 2rem;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition);
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 500;
}

.link-item:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
    text-decoration: none;
    color: var(--color-accent);
    transform: translateX(3px);
}

.link-item .link-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    flex-shrink: 0;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: rgba(255,255,255,0.85);
    margin-left: 0;
    padding: 2.5rem 3rem 1.5rem;
    padding-left: calc(var(--sidebar-width) + 3rem);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 860px;
    margin: 0 auto;
}

.footer-section h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #38bdf8;
}

.footer-section p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.footer-links a {
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color var(--transition);
}

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

.footer-bottom {
    max-width: 860px;
    margin: 2rem auto 0;
    padding-top: 1.25rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.4);
}

.footer-social {
    display: flex;
    gap: 0.75rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    color: rgba(255,255,255,0.5);
}

.social-link:hover {
    color: white;
    background: rgba(255,255,255,0.1);
}

.social-link svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* ============================================
   Mobile Bottom Navigation Bar
   ============================================ */

.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    z-index: 1000;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}

.mobile-bottom-nav .bottom-nav-items {
    display: flex;
    align-items: center;
    justify-content: space-around;
    height: 100%;
    padding: 0;
    margin: 0;
    list-style: none;
}

.mobile-bottom-nav .bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 12px;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.65rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.mobile-bottom-nav .bottom-nav-item:hover,
.mobile-bottom-nav .bottom-nav-item:active {
    color: var(--color-accent);
    text-decoration: none;
}

.mobile-bottom-nav .bottom-nav-item svg {
    width: 22px;
    height: 22px;
    stroke-width: 1.75;
}

.mobile-bottom-nav .bottom-nav-item.socialize:active { color: var(--color-socialize); }
.mobile-bottom-nav .bottom-nav-item.decode:active { color: var(--color-decode); }
.mobile-bottom-nav .bottom-nav-item.consult:active { color: var(--color-consult); }

/* ============================================
   Table scroll wrapper (for mobile)
   ============================================ */

.table-scroll-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 1.5rem -1rem;
    padding: 0 1rem;
}

.table-scroll-wrapper table {
    margin: 0;
    min-width: 500px;
}

/* ============================================
   Responsive — Tablet (≤1024px)
   ============================================ */

@media (max-width: 1024px) {
    .site-sidebar {
        transform: translateX(-100%);
    }
    
    .site-sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    
    .sidebar-toggle {
        display: flex;
    }
    
    .site-main {
        margin-left: 0;
    }
    
    .site-footer {
        padding-left: 1.5rem;
    }
    
    .content-wrapper {
        padding: 2rem 1.5rem;
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.4);
        z-index: 899;
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
    }
    
    .sidebar-overlay.active {
        display: block;
    }
    
    /* Larger touch targets for nav links on tablet */
    .nav-link {
        padding: 0.6rem 1.25rem;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .nav-toggle {
        width: 28px;
        height: 28px;
    }
}

/* ============================================
   Responsive — Mobile (≤768px)
   ============================================ */

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }
    
    /* Show mobile bottom nav */
    .mobile-bottom-nav {
        display: block;
    }
    
    /* Hide desktop header nav links (they're in bottom nav now) */
    .header-nav {
        display: none;
    }
    
    /* Add bottom padding for fixed bottom nav */
    .site-main {
        padding-bottom: 56px;
    }
    
    /* Sidebar takes full width on small mobile */
    .site-sidebar {
        width: 85vw;
        max-width: 320px;
    }
    
    /* Bigger touch targets in sidebar */
    .nav-link {
        padding: 0.7rem 1.25rem;
        font-size: 0.9rem;
        min-height: 48px;
    }
    
    /* Content adjustments */
    .content-wrapper {
        padding: 1.5rem 1.25rem;
    }
    
    .page-title {
        font-size: 1.5rem;
        line-height: 1.35;
    }
    
    .home-hero {
        padding: 2rem 0 1.5rem;
    }
    
    .home-hero h1 {
        font-size: 1.7rem;
    }
    
    .home-hero .subtitle {
        font-size: 0.95rem;
    }
    
    .home-hero .contact-info {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .home-hero .contact-info a {
        width: 100%;
        justify-content: center;
        padding: 0.75rem 1rem;
    }
    
    /* Grids go single column */
    .topic-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .toc-grid {
        grid-template-columns: 1fr;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    /* Link items need bigger touch targets */
    .link-item {
        padding: 1rem 1.25rem;
        min-height: 48px;
    }
    
    /* Section headings */
    .section-heading {
        font-size: 1.15rem;
    }
    
    /* Article content */
    .article-content {
        font-size: 0.95rem;
        line-height: 1.75;
    }
    
    .article-content h1 {
        font-size: 1.4rem;
    }
    
    .article-content h2 {
        font-size: 1.2rem;
    }
    
    .article-content h3 {
        font-size: 1.05rem;
    }
    
    .article-content ul, .article-content ol {
        margin-left: 1rem;
    }
    
    /* Tables scroll horizontally */
    .article-content table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
        font-size: 0.82rem;
    }
    
    .article-content th, .article-content td {
        padding: 0.6rem 0.75rem;
    }
    
    /* External link cards stack better */
    .external-link-card {
        padding: 1rem 1.25rem;
    }
    
    .external-link-card .link-url {
        word-break: break-all;
        font-size: 0.75rem;
    }
    
    /* PDF embed shorter on mobile */
    .pdf-embed {
        height: 60vh;
    }
    
    /* Footer */
    .site-footer {
        padding: 2rem 1.25rem 1.5rem;
        padding-bottom: calc(1.5rem + 56px); /* Account for bottom nav */
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    /* Breadcrumbs: scrollable on mobile */
    .breadcrumbs {
        overflow-x: auto;
        flex-wrap: nowrap;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 0.5rem;
        margin-bottom: 1rem;
        scrollbar-width: none;
    }
    
    .breadcrumbs::-webkit-scrollbar {
        display: none;
    }
}

/* ============================================
   Responsive — Small Mobile (≤480px)
   ============================================ */

@media (max-width: 480px) {
    .content-wrapper {
        padding: 1.25rem 1rem;
    }
    
    .page-title {
        font-size: 1.35rem;
    }
    
    .home-hero h1 {
        font-size: 1.5rem;
    }
    
    .topic-card {
        padding: 1.25rem;
    }
    
    .link-item {
        font-size: 0.85rem;
    }
    
    /* Even the logo scales down */
    .site-title {
        font-size: 1rem;
    }
    
    .site-subtitle {
        display: none;
    }
    
    .logo-image {
        width: 30px;
        height: 30px;
    }
    
    .home-logo {
        width: 90px;
        height: 90px;
    }
}

/* ============================================
   Touch & Accessibility
   ============================================ */

@media (hover: none) and (pointer: coarse) {
    /* Remove hover transforms on touch devices (prevents sticky states) */
    .topic-card:hover {
        transform: none;
    }
    
    .link-item:hover {
        transform: none;
    }
    
    .external-link-card:hover {
        transform: none;
    }
    
    /* Active states instead of hover */
    .topic-card:active {
        border-color: var(--color-accent);
        box-shadow: var(--shadow-sm);
    }
    
    .link-item:active {
        border-color: var(--color-accent);
        background: var(--color-accent-light);
    }
    
    .nav-link:active {
        background: var(--color-sidebar-active);
    }
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}