/* ==========================================================================
   Knowledge Codex - Custom Styles
   A scholarly, warm aesthetic for personal learning
   ========================================================================== */

:root {
    /* Color palette - warm, scholarly tones */
    --color-bg: #faf8f5;
    --color-bg-secondary: #f5f2ed;
    --color-bg-card: #ffffff;
    --color-text: #2d2a26;
    --color-text-muted: #6b6560;
    --color-text-light: #8a847d;
    --color-primary: #b45309;
    --color-primary-hover: #92400e;
    --color-primary-light: #fef3c7;
    --color-accent: #0f766e;
    --color-border: #e7e4df;
    --color-border-light: #f0ede8;
    
    /* Typography */
    --font-display: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Crimson Pro', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(45, 42, 38, 0.04);
    --shadow-md: 0 4px 12px rgba(45, 42, 38, 0.08);
    --shadow-lg: 0 8px 24px rgba(45, 42, 38, 0.12);
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Dark theme */
[data-bs-theme="dark"] {
    --color-bg: #1a1917;
    --color-bg-secondary: #242220;
    --color-bg-card: #2d2a27;
    --color-text: #f5f2ed;
    --color-text-muted: #a8a29e;
    --color-text-light: #78716c;
    --color-primary: #f59e0b;
    --color-primary-hover: #fbbf24;
    --color-primary-light: #451a03;
    --color-accent: #2dd4bf;
    --color-border: #3d3a36;
    --color-border-light: #2d2a26;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* ==========================================================================
   Base styles
   ========================================================================== */

body {
    font-family: var(--font-body);
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

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

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

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-bg-secondary);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
}

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

.site-header {
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.navbar {
    padding: var(--space-md) 0;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text) !important;
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.1rem;
}

.nav-link {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted) !important;
    padding: var(--space-sm) var(--space-md) !important;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text) !important;
    background: var(--color-bg-secondary);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

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

/* ==========================================================================
   Main content
   ========================================================================== */

.main-content {
    flex: 1;
}

/* Hero section */
.hero-section {
    text-align: center;
    padding: var(--space-2xl) 0;
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.hero-section .lead {
    font-size: 1.25rem;
    color: var(--color-text-muted);
}

/* Breadcrumbs */
.breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 0;
    font-family: var(--font-display);
    font-size: 0.9rem;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "→";
    color: var(--color-text-light);
}

.breadcrumb-item a {
    color: var(--color-text-muted);
}

.breadcrumb-item.active {
    color: var(--color-text);
}

/* ==========================================================================
   Category cards
   ========================================================================== */

.category-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-normal);
}

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

.category-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.category-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.category-title a {
    color: var(--color-text);
}

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

.category-count {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.document-preview {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.95rem;
}

.document-preview li {
    padding: var(--space-xs) 0;
    border-top: 1px solid var(--color-border-light);
}

.document-preview li:first-child {
    border-top: none;
}

.document-preview a {
    color: var(--color-text-muted);
}

.document-preview a:hover {
    color: var(--color-primary);
}

.document-preview .more-docs {
    color: var(--color-text-light);
    font-style: italic;
}

/* ==========================================================================
   Document list
   ========================================================================== */

.category-header {
    margin-bottom: var(--space-xl);
}

.category-header h1 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

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

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

.document-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.document-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.document-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.document-item:hover .document-icon {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.document-info {
    flex: 1;
    min-width: 0;
}

.document-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 0;
}

.document-excerpt {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin: var(--space-xs) 0 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.document-meta {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-top: var(--space-xs);
    display: flex;
    gap: var(--space-md);
}

.document-meta i {
    margin-right: 0.25em;
}

.document-arrow {
    color: var(--color-text-light);
    transition: all var(--transition-fast);
}

.document-item:hover .document-arrow {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* ==========================================================================
   Document content (Markdown)
   ========================================================================== */

.document-content {
    max-width: 800px;
    margin: 0 auto;
}

.document-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.document-header h1 {
    font-size: 2.25rem;
    margin-bottom: 0;
}

.markdown-body {
    font-size: 1.125rem;
    line-height: 1.8;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
}

.markdown-body h1 { font-size: 1.875rem; }
.markdown-body h2 { font-size: 1.5rem; }
.markdown-body h3 { font-size: 1.25rem; }
.markdown-body h4 { font-size: 1.125rem; }

.markdown-body p {
    margin-bottom: var(--space-lg);
}

.markdown-body ul,
.markdown-body ol {
    margin-bottom: var(--space-lg);
    padding-left: var(--space-xl);
}

.markdown-body li {
    margin-bottom: var(--space-sm);
}

.markdown-body blockquote {
    margin: var(--space-xl) 0;
    padding: var(--space-lg) var(--space-xl);
    background: var(--color-bg-secondary);
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
}

.markdown-body blockquote p:last-child {
    margin-bottom: 0;
}

.markdown-body pre {
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    background: #282c34;
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.markdown-body pre code {
    background: transparent;
    padding: 0;
    font-size: 0.9rem;
    line-height: 1.6;
    color: #abb2bf;
}

.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--space-lg) 0;
}

.markdown-body table {
    width: 100%;
    margin: var(--space-xl) 0;
    border-collapse: collapse;
}

.markdown-body th,
.markdown-body td {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    text-align: left;
}

.markdown-body th {
    background: var(--color-bg-secondary);
    font-family: var(--font-display);
    font-weight: 600;
}

.markdown-body hr {
    margin: var(--space-2xl) 0;
    border: none;
    border-top: 1px solid var(--color-border);
}

.markdown-body a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.markdown-body a:hover {
    color: var(--color-primary-hover);
}

/* ==========================================================================
   Empty states
   ========================================================================== */

.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.empty-state p {
    margin-bottom: 0;
}

.error-state {
    text-align: center;
    padding: var(--space-2xl);
}

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

.site-footer {
    margin-top: auto;
    padding: var(--space-xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--color-text);
}

.footer-brand i {
    color: var(--color-primary);
}

.footer-meta {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.footer-meta .separator {
    margin: 0 var(--space-sm);
}

/* ==========================================================================
   Utility classes
   ========================================================================== */

.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    font-family: var(--font-display);
}

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

/* ==========================================================================
   Search
   ========================================================================== */

.search-form {
    flex: 1;
    max-width: 400px;
    margin: 0 var(--space-lg);
}

.search-input-group {
    display: flex;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.search-input-group:focus-within {
    border-color: var(--color-primary);
}

.search-input {
    flex: 1;
    border: none;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-display);
    font-size: 0.9rem;
    background: transparent;
    color: var(--color-text);
}

.search-input:focus {
    outline: none;
}

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

.search-button {
    border: none;
    background: transparent;
    padding: 0 var(--space-md);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.search-button:hover {
    color: var(--color-primary);
}

.search-results-header h1 {
    display: flex;
    align-items: center;
}

.search-results-count {
    font-family: var(--font-display);
    font-size: 0.9rem;
}

/* ==========================================================================
   Tags
   ========================================================================== */

.tag-cloud-section {
    padding: var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.tag-cloud-section h2 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.tag-badge:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

.tag-count {
    font-size: 0.75rem;
    color: var(--color-text-light);
    background: var(--color-bg);
    padding: 0.15em 0.5em;
    border-radius: 999px;
    min-width: 1.5em;
    text-align: center;
}

.tag-badge-small {
    display: inline-block;
    padding: 0.2em 0.7em;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: 999px;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    margin-right: var(--space-xs);
    transition: all var(--transition-fast);
}

.tag-badge-small:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.document-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
}

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

.tag-filter-header h1 {
    display: flex;
    align-items: center;
}

/* ==========================================================================
   Responsive adjustments
   ========================================================================== */

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .document-header h1 {
        font-size: 1.75rem;
    }
    
    .markdown-body {
        font-size: 1rem;
    }
    
    .category-card {
        padding: var(--space-lg);
    }
    
    .document-item {
        padding: var(--space-md);
    }
    
    .document-excerpt {
        display: none;
    }

    .search-form {
        max-width: 100%;
        margin: var(--space-md) 0;
        order: 3;
        width: 100%;
    }

    .navbar-collapse {
        padding-top: var(--space-md);
    }

    .tag-cloud-section {
        padding: var(--space-md);
    }
}