/**
 * Core Styles - Shared across all sections
 * Typography, Layout, Tables, Responsive Design
 */

/* Core Variables */
:root {
    --sidebar-width: 260px;
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-teal: #14b8a6;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --bg-main: #ffffff;
    --bg-gradient: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    --bg-sidebar: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    --border: #e2e8f0;
    --border-light: #f1f5f9;

    /* Color bars for tables */
    --color-blue: #3b82f6;
    --color-orange: #f97316;
    --color-purple: #a855f7;
    --color-cyan: #06b6d4;
    --color-yellow: #eab308;
    --color-green: #22c55e;
    --color-red: #ef4444;
    --color-gray: #6b7280;
}

/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Base Typography */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    color: var(--text-primary);
    background: var(--bg-gradient);
    line-height: 1.6;
    font-feature-settings: 'cv01', 'cv02', 'cv03', 'cv04';
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Mode-specific font scaling */
body.slides-mode {
    font-size: 24px;
}

/* Layout */
.layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    padding: 2rem 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    box-shadow: 1px 0 10px rgba(0, 0, 0, 0.05);
}

.sidebar h2 {
    padding: 0 1.5rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-nav {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 1.5rem auto 1.5rem auto;
    display: block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.nav-section {
    margin-bottom: 2rem;
}

.nav-section h3 {
    padding: 0 1.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.nav-link {
    display: block;
    padding: 0.5rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.nav-link:hover {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1) 0%, transparent 100%);
    color: var(--primary);
    padding-left: 1.75rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link.active {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.15) 0%, transparent 100%);
    color: var(--primary);
    border-left: 3px solid var(--primary);
    font-weight: 600;
}

/* Main Content */
.main {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 2rem 3rem;
    max-width: 1200px;
    width: 100%;
    transition: margin-left 0.3s ease;
}

body.slides-mode .sidebar {
    display: none;
}

body.slides-mode .main {
    margin-left: 0;
    padding: 3rem 4rem;
    max-width: none;
}

/* Footer Navigation (Option B: Modern Minimalist) */
.footer-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 5rem;
    padding-top: 3rem;
    border-top: 2px solid var(--primary);
    /* Thicker, colored rule */
    gap: 2rem;
    position: relative;
    width: 100%;
    box-sizing: border-box;
}

.footer-nav::before {
    content: "CONTINUE LEARNING";
    position: absolute;
    top: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    padding: 0 1.5rem;
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 0.15em;
}

.nav-btn {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    background: transparent;
    /* Ghost button */
    border: 1px solid transparent;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    max-width: 48%;
    position: relative;
}

.nav-btn:hover {
    background: rgba(37, 99, 235, 0.05);
    /* Soft tint on hover */
    border-color: rgba(37, 99, 235, 0.1);
    transform: translateY(-4px);
}

.nav-btn-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: gap 0.3s ease;
}

.nav-btn.prev .nav-btn-label::before {
    content: "←";
    font-size: 1.2rem;
    font-weight: 400;
}

.nav-btn.next .nav-btn-label::after {
    content: "→";
    font-size: 1.2rem;
    font-weight: 400;
}

.nav-btn:hover .nav-btn-label {
    color: var(--primary);
    gap: 0.8rem;
}

.nav-btn-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 0.25rem;
    position: relative;
    display: inline-block;
}

/* Underline transition */
.nav-btn-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-btn:hover .nav-btn-title::after {
    width: 100%;
}

.nav-btn.next {
    text-align: right;
    align-items: flex-end;
}

@media (max-width: 640px) {
    .footer-nav {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
        margin-top: 3rem;
        padding-top: 2rem;
    }

    .footer-nav::before {
        font-size: 0.6rem;
        padding: 0 1rem;
    }

    .nav-btn {
        max-width: 100%;
        text-align: center;
        align-items: center;
        padding: 0.75rem 1rem;
    }

    .nav-btn-label {
        font-size: 0.7rem;
    }

    .nav-btn-title {
        font-size: 0.95rem;
    }
}

/* Mobile Responsiveness */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 2000;
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        width: 280px;
    }

    .sidebar.active {
        transform: translateX(0);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.2);
    }

    .main {
        margin-left: 0;
        padding: 4rem 1.5rem 1.5rem 1.5rem;
        /* Increased top padding for top bar */
    }

    /* Mobile Header/Toggle */
    .mobile-nav-toggle {
        display: flex !important;
        position: fixed;
        top: 0;
        left: 0;
        width: 56px;
        height: 56px;
        background: transparent;
        color: var(--primary);
        border-radius: 0;
        align-items: center;
        justify-content: center;
        box-shadow: none;
        z-index: 2100;
        border: none;
        cursor: pointer;
        font-size: 1.5rem;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 1999;
        backdrop-filter: blur(2px);
    }

    .sidebar-overlay.active {
        display: block;
    }

    /* Stacking for Side-by-Side */
    .side-by-side,
    .side-by-side.cols-3,
    .side-by-side.cols-4 {
        grid-template-columns: 1fr !important;
        gap: 2rem;
    }

    .side-by-side>div {
        width: 100% !important;
    }

    /* Typography adjustments */
    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    /* Ensure elements don't overflow */
    pre,
    table {
        max-width: 100% !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
    }

    /* Fixed Top Bar on Mobile */
    .mode-toggle {
        top: 0 !important;
        right: 0 !important;
        left: 0 !important;
        width: 100% !important;
        border-radius: 0 !important;
        padding: 0.5rem !important;
        background: rgba(255, 255, 255, 0.95) !important;
        backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--border) !important;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05) !important;
        display: flex !important;
        justify-content: flex-end;
        /* Push buttons to right */
        align-items: center;
        height: 56px;
    }

    .mobile-breadcrumb {
        display: none !important;
    }

    .mobile-breadcrumb {
        display: none !important;
    }

    /* Compact Buttons on Mobile */
    .mode-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }

    @media (max-width: 480px) {
        .mode-btn span {
            display: none;
            /* Hide text on very small screens */
        }

        .mode-btn::before {
            font-size: 1.1rem;
        }

        .mode-btn[data-mode="docs"]::before {
            content: "📄";
        }

        .mode-btn[data-mode="slides"]::before {
            content: "📽️";
        }

        .mobile-breadcrumb {
            max-width: 50%;
        }
    }
}

/* Hide breadcrumb on desktop */
.mobile-breadcrumb {
    display: none;
}

/* Hide mobile toggle by default */
.mobile-nav-toggle {
    display: none;
}

/* Mode Toggle */
.mode-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    gap: 0;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    padding: 4px;
    border-radius: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1),
        0 0 1px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.mode-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mode-btn:hover {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

/* Typography */
h1 {
    font-size: 2.5rem;
    margin-top: 0;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    letter-spacing: -0.03em;
    position: relative;
}

.main h1:first-of-type,
.main .mode-toggle+h1 {
    margin-top: 0 !important;
}

h1::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent-purple) 100%);
    border-radius: 2px;
}

body.slides-mode h1 {
    font-size: 52px;
    margin-bottom: 3rem;
    text-align: left;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h2 {
    font-size: 1.75rem;
    margin: 2.5rem 0 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
    padding: 0;
    position: relative;
    padding-left: 1rem;
}

h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 1.5em;
    background: linear-gradient(180deg, var(--accent-teal) 0%, var(--primary) 100%);
    border-radius: 2px;
}

body.slides-mode h2 {
    font-size: 44px;
    margin: 0 0 2rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
    margin: 1.5rem 0 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

body.slides-mode h3 {
    font-size: 34px;
    margin: 1.5rem 0 1rem;
    font-weight: 500;
}

/* Content Sections */
p {
    margin-bottom: 1.25rem;
    line-height: 1.75;
    max-width: 900px;
    color: var(--text-primary);
}

/* Style for standalone strong/em text (like subheadings) - disabled to prevent blue text in lists
p:has(> strong:only-child),
p:has(> em:only-child) {
    margin: 1.5rem 0 1rem;
    font-size: 1.2em;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: -0.01em;
} */

ul,
ol {
    margin: 1rem 0 1.5rem;
    padding-left: 1.5rem;
    max-width: 900px;
}

li::marker {
    color: var(--text-primary);
}

body.slides-mode p {
    font-size: 28px;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    max-width: 100%;
}

body.slides-mode ul,
body.slides-mode ol {
    font-size: 28px;
    line-height: 1.8;
    margin: 1.5rem 0 2rem;
    padding-left: 2rem;
    max-width: 100%;
}

/* Special styling for emphasized paragraphs - disabled to keep text black
p strong:first-child {
    color: var(--primary);
    font-size: 1.1em;
} */

/* Horizontal rules */
hr {
    margin: 2.5rem 0;
    border: none;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--border), transparent);
}

/* Tables - Enhanced style */
table {
    width: auto;
    border-collapse: collapse;
    margin: 1.5rem auto;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    font-size: 14px;
    max-width: 850px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04),
        0 0 1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

table:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08),
        0 0 1px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

th {
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 0.6rem 0.9rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

td {
    padding: 0.5rem 0.9rem;
    border-bottom: 1px solid var(--border-light);
    font-size: 14px;
    white-space: nowrap;
    color: var(--text-primary);
}

tbody tr:nth-child(even) td {
    background: rgba(248, 250, 252, 0.5);
}

/* Better sizing in slides mode */
body.slides-mode table {
    font-size: 18px;
    max-width: 80%;
    margin: 2rem auto;
}

body.slides-mode th {
    padding: 0.75rem 1rem;
    font-size: 16px;
    background: #f8f9fa;
}

body.slides-mode td {
    padding: 0.5rem 1rem;
    font-size: 18px;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:hover td:not(.color-bar):not(.annotation) {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    transition: background 0.2s ease;
}

/* Side-by-side layout for tables and content */
.side-by-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 2rem auto;
    max-width: 100%;
    align-items: start;
}

.side-by-side>div {
    min-width: 0;
    /* Prevent overflow */
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Ensure tables in side-by-side fit properly - extra compact */
.side-by-side table {
    margin: 0 auto;
    max-width: 100%;
    font-size: 0.75rem;
}

.side-by-side th {
    padding: 0.25rem 0.4rem;
    font-size: 0.65rem;
}

.side-by-side td {
    padding: 0.2rem 0.35rem;
    font-size: 0.75rem;
}

/* Ensure code blocks in side-by-side fit properly */
.side-by-side pre {
    margin: 0;
}

/* Align SQL blocks at top when paired with debug tables */
.side-by-side.align-top>div {
    align-items: flex-start;
}

/* For slides mode - maintain side-by-side but adjust sizing */
.slides-mode .side-by-side {
    max-width: 95%;
    gap: 1rem;
}

.slides-mode .side-by-side table {
    font-size: 0.8rem;
    max-width: 100%;
}

.slides-mode .side-by-side th {
    padding: 0.25rem 0.35rem;
    font-size: 0.7rem;
}

.slides-mode .side-by-side td {
    padding: 0.2rem 0.3rem;
    font-size: 0.8rem;
}

/* Responsive: Stack on smaller screens */
@media (max-width: 1200px) {
    body:not(.slides-mode) .side-by-side {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* For 3+ column layouts */
.side-by-side.cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.side-by-side.cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Responsive for multi-column */
@media (max-width: 1400px) {

    body:not(.slides-mode) .side-by-side.cols-3,
    body:not(.slides-mode) .side-by-side.cols-4 {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 900px) {

    body:not(.slides-mode) .side-by-side.cols-3,
    body:not(.slides-mode) .side-by-side.cols-4 {
        grid-template-columns: 1fr;
    }
}

/* Annotation columns - visually different */
th.annotation {
    background: #fef3c7;
    font-style: italic;
    text-transform: none;
    color: #92400e;
    border-left: 2px dotted #f59e0b;
}

td.annotation {
    background: #fffbeb;
    font-style: italic;
    color: #78716c;
    font-size: 0.8rem;
    border-left: 2px dotted #fbbf24;
}

body.slides-mode td.annotation {
    font-size: 0.85rem;
}

/* Color bars - EXACT 3px width */
.color-bar {
    width: 3px !important;
    max-width: 3px !important;
    padding: 0 !important;
    border: none;
}

/* Override for side-by-side layouts */
.side-by-side td.color-bar,
.side-by-side th.color-bar {
    min-width: 3px !important;
    width: 3px !important;
    max-width: 3px !important;
    padding: 0 !important;
}

/* Force color bars to be visible in wide tables */
.side-by-side table td.color-bar,
.side-by-side table th.color-bar {
    min-width: 3px !important;
    width: 3px !important;
    max-width: 3px !important;
    padding: 0 !important;
}

/* Override for slides mode side-by-side */
.slides-mode .side-by-side td.color-bar,
.slides-mode .side-by-side th.color-bar {
    width: 3px !important;
    max-width: 3px !important;
    padding: 0 !important;
}

/* Color bar specific colors */
.color-bar.blue {
    background: var(--color-blue) !important;
}

.color-bar.orange {
    background: var(--color-orange) !important;
}

.color-bar.purple {
    background: var(--color-purple) !important;
}

.color-bar.cyan {
    background: var(--color-cyan) !important;
}

.color-bar.green {
    background: var(--color-green) !important;
}

.color-bar.yellow {
    background: var(--color-yellow) !important;
}

.color-bar.red {
    background: var(--color-red) !important;
}

.color-bar.gray {
    background: var(--color-gray) !important;
}

/* NULL values styling */
.null-value {
    background: #e5e7eb;
    color: #6b7280;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Code Blocks - General */
pre {
    margin: 1.5rem 0;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.5;
    position: relative;
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 14px;
}

/* List items */
li {
    margin-bottom: 0.5rem;
    color: var(--text-primary) !important;
}

body.slides-mode li {
    margin-bottom: 0.75rem;
    color: var(--text-primary) !important;
}

/* Ensure list text is black, not blue */
ul li,
ol li {
    color: var(--text-primary) !important;
}

/* Keep strong text black in lists */
li strong {
    color: inherit;
    font-weight: 600;
}

/* Ensure paragraphs inside list items are black, not blue */
li p {
    color: var(--text-primary) !important;
}

/* Override any inherited blue styling for list content */
ol li p,
ul li p {
    color: var(--text-primary) !important;
}

/* Ensure all text in lists stays black */
li,
li * {
    color: var(--text-primary) !important;
}

/* Lightweight in-page TOC, reuses .nav-link styles */
.toc-nav {
    background: var(--bg-sidebar);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    z-index: 50;
}

/* Enhanced nav-section styling for TOC - more compact */
.toc-nav .nav-section {
    margin-bottom: 1.5rem;
}

.toc-nav .nav-section h3 {
    padding: 0 1.5rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.25rem;
}

.toc-nav .nav-section ul {
    padding-left: 0;
}

.toc-nav .nav-section li {
    margin-bottom: 0.1rem;
}

/* More compact nav-link styling */
.toc-nav .nav-link {
    padding: 0.4rem 1.5rem;
    font-size: 0.9rem;
    line-height: 1.3;
}

/* Sub-links with proper indentation - more compact */
.toc-nav .sub {
    margin-left: 0.5rem;
    font-size: 0.8rem;
    opacity: 0.9;
    position: relative;
}

.toc-nav .sub.nav-link {
    padding: 0.3rem 0.6rem 0.3rem 1.2rem;
    border-left: 2px solid transparent;
    transition: all 0.2s ease;
    font-size: 0.8rem;
}

.toc-nav .sub.nav-link:hover {
    border-left-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.toc-nav .sub.nav-link.active {
    border-left-color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
}

/* When combined with .sidebar, override some positioning - more compact */
.sidebar.toc-nav {
    padding: 1.5rem 0;
    border-radius: 0;
    box-shadow: 1px 0 10px rgba(0, 0, 0, 0.05);
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    overflow-y: auto;
}

/* Positioning (desktop fixed; mobile drawer) */
@media (min-width: 1024px) {
    body.has-sidenav {
        padding-left: 300px;
    }

    .toc-nav {
        position: fixed;
        left: 16px;
        top: 100px;
        width: 220px;
        max-height: calc(100vh - 120px);
        overflow: auto;
    }

    .sidebar.toc-nav {
        left: 0;
        top: 0;
        width: var(--sidebar-width);
        height: 100vh;
        max-height: none;
    }
}

@media (max-width: 1023px) {
    .toc-nav {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 75%;
        max-width: 300px;
        transform: translateX(-100%);
        transition: transform .3s cubic-bezier(.4, 0, .2, 1);
        border-radius: 0 12px 12px 0;
    }

    body.sidenav-open .toc-nav {
        transform: translateX(0);
    }
}

/* Minimal callouts to replace inline styles */
.callout {
    border-radius: 12px;
    padding: 1.25rem;
    margin: 1.5rem 0;
    border: 1px solid var(--border);
    background: #fff;
}

.callout.success {
    background: #f0fdf4;
    border-color: #86efac;
}

.callout.info {
    background: #eff6ff;
    border-color: #3b82f6;
}

.callout.warning {
    background: #fef3c7;
    border-color: #fbbf24;
}

.callout.danger {
    background: #fee2e2;
    border-color: #ef4444;
}

/* Simple top navigation */
.top-nav {
    display: flex;
    gap: 1rem;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-sidebar);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
}

.top-nav a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    transition: all .2s;
}

.top-nav a:hover {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
}

.top-nav a.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

/* =====================================================
   SQL CODE BLOCKS - SHARED ACROSS ALL SECTIONS  
   ===================================================== */

/* General Pre Tag Defaults - Light theme base */
pre {
    padding: 1.5rem 1.75rem;
    border-radius: 12px;
    margin: 1.5rem auto;
    overflow-x: auto;
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Menlo', monospace;
    font-size: 14px;
    line-height: 1.7;
    max-width: 1100px;
    position: relative;
    transition: all 0.3s ease;
    background: #f8fafc;
    color: #334155;
    border: 1px solid #e2e8f0;
}

/* SQL Code Blocks - Dark theme with professional styling */
.codehilite pre,
pre.language-sql,
pre.language-python,
pre.language-js,
pre.language-javascript {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%) !important;
    color: #e6edf3 !important;
    border: 1px solid rgba(56, 139, 253, 0.15) !important;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1),
        0 0 40px rgba(37, 99, 235, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.05) !important;
}

/* Auto-detect SQL blocks by presence of SQL syntax highlighting spans */
pre:has(.sql-keyword),
pre:has(.sql-comment),
pre:has(.sql-table),
pre:has(.sql-function),
pre:has(code.language-sql),
pre:has(code.language-python),
pre:has(code.language-js),
pre:has(code.language-javascript) {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%) !important;
    color: #e6edf3 !important;
    border: 1px solid rgba(56, 139, 253, 0.15) !important;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1),
        0 0 40px rgba(37, 99, 235, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.05) !important;
}

/* JavaScript fallback for SQL detection */
pre.sql-detected {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%) !important;
    color: #e6edf3 !important;
    border: 1px solid rgba(56, 139, 253, 0.15) !important;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1),
        0 0 40px rgba(37, 99, 235, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.05) !important;
}

/* Light Display Theme for sequences, algorithms, etc. */
pre.light-display {
    background: rgba(255, 255, 255, 0.95);
    color: #1e293b;
    border: 1px solid #cbd5e1;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

pre:hover {
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15),
        0 0 60px rgba(37, 99, 235, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    border-color: rgba(56, 139, 253, 0.3);
}

/* SQL label in top-right corner */
pre::before {
    content: 'SQL';
    position: absolute;
    top: 0.75rem;
    right: 1rem;
    font-size: 10px;
    color: #7ee787;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    font-family: 'Inter', -apple-system, sans-serif;
    padding: 2px 8px;
    background: rgba(126, 231, 135, 0.1);
    border: 1px solid rgba(126, 231, 135, 0.2);
    border-radius: 4px;
}

/* SQL Syntax Highlighting - High contrast dark theme */
.sql-keyword {
    color: #79c0ff;
    font-weight: 600;
}

.sql-string {
    color: #a5d6ff;
}

.sql-number {
    color: #ff7b72;
}

.sql-operator {
    color: #c9d1d9;
}

.sql-comment {
    color: #f0ad4e;
    /* Warm orange - pleasant and visible */
    font-weight: normal;
    /* Regular weight, not bold */
    opacity: 1.0;
    /* Full visibility for presentations */
    background: rgba(240, 173, 78, 0.08);
    /* Very subtle orange background */
    padding: 1px 4px;
    border-radius: 3px;
    text-shadow: 0 0 1px rgba(240, 173, 78, 0.2);
    /* Subtle glow */
}

.sql-function {
    color: #d2a8ff;
    font-weight: 500;
}

.sql-table {
    color: #7ee787;
    font-weight: 600;
}

/* Ensure inline code doesn't interfere with SQL blocks */
code {
    background: #f1f5f9;
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    font-family: 'Fira Code', 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 0.9em;
}

pre code {
    background: transparent;
    padding: 0;
}

/* Enhanced styling for slides mode */
body.slides-mode pre {
    font-size: 20px;
    padding: 2rem 2.5rem;
    max-width: 90%;
    margin: 2rem auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3),
        0 0 80px rgba(37, 99, 235, 0.15);
}

/* --------------------------------------
   Case Study Specialized Styles 
   -------------------------------------- */

/* Pull case study titles to the very top */
body.case-study-page .main {
    padding-top: 1rem;
    color: #334155;
    font-size: 1.125rem;
    line-height: 1.8;
}

body.case-study-page .main h1 {
    font-size: 2.75rem;
    line-height: 1.2;
    margin-bottom: 2.5rem;
    color: #1e293b;
    text-align: center;
}

body.case-study-page .main h1::after {
    left: 50%;
    transform: translateX(-50%);
}

.main h1:first-of-type {
    margin-top: 0;
}

body.case-study-page .main h2 {
    font-size: 1.75rem;
    margin-top: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary);
    border-bottom: 2px solid var(--border-light);
    padding-bottom: 0.5rem;
    padding-left: 0;
}

body.case-study-page .main h2::before {
    display: none;
}

body.case-study-page .main p {
    margin-bottom: 1.5rem;
}

.case-study-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
    justify-content: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.case-study-meta .tag {
    background: #eff6ff;
    color: #2563eb;
    padding: 2px 10px;
    border-radius: 100px;
    font-weight: 600;
}

.follow-on-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 3rem 0;
}

.follow-on-article {
    background: white;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.follow-on-article:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.1);
}

.follow-on-article h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1.1rem;
    color: var(--primary);
}

.follow-on-article p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

/* Hide mode toggle for Case Studies as they are Docs-only */
body.case-study-page .mode-toggle {
    display: none !important;
}

@media (max-width: 768px) {
    .case-study-container {
        margin: 1.5rem auto;
        font-size: 1.05rem;
    }

    .case-study-container h1 {
        font-size: 2rem;
    }
}
/* Index-style Badges for Navbars */
.quiz-badge { background: #d1fae5; color: #047857; width: 18px; height: 18px; font-size: 0.55rem; padding: 0; display: inline-flex; justify-content: center; align-items: center; border-radius: 4px; font-weight: 700; flex-shrink: 0; }
.case-badge { background: #ede9fe; color: #6d28d9; width: 18px; height: 18px; font-size: 0.55rem; padding: 0; display: inline-flex; justify-content: center; align-items: center; border-radius: 4px; font-weight: 700; flex-shrink: 0; }

/* Standard Module Badge */
.module-badge {
    background: #2563eb;
    color: #ffffff;
    padding: 0.1rem 0.35rem;
    border-radius: 6px;
    font-size: 0.75em;
    font-weight: 800;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border: 1px solid #1d4ed8;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    letter-spacing: 0.05em;
    vertical-align: middle;
}