@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600&display=swap');

:root {
    /* Fonts */
    --font-mono: 'Fira Code', 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Light Theme Colors (Clean Off-White & Soft Indigo/Teal Accent) */
    --bg-primary: #fcfcfd;
    --bg-secondary: #f8fafc;
    --bg-sidebar: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-rgb: 79, 70, 229;
    --border-color: #e2e8f0;
    
    /* Callout & Theorem Box Colors */
    --callout-note-bg: rgba(59, 130, 246, 0.07);
    --callout-note-border: #3b82f6;
    --callout-warning-bg: rgba(245, 158, 11, 0.07);
    --callout-warning-border: #f59e0b;
    --callout-important-bg: rgba(239, 68, 68, 0.07);
    --callout-important-border: #ef4444;
    --callout-tip-bg: rgba(16, 185, 129, 0.07);
    --callout-tip-border: #10b981;
    --callout-caution-bg: rgba(139, 92, 246, 0.07);
    --callout-caution-border: #8b5cf6;

    /* Shadows & Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.05), 0 2px 6px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.06), 0 4px 12px -2px rgba(0, 0, 0, 0.03);

    /* Cozy Slate Light Code Blocks (Light Mode) */
    --code-bg: #f8fafc;
    --code-text: #1e293b;
    --code-line-hover: rgba(79, 70, 229, 0.06);
}

/* Dark Theme Adjustments if the document uses quarto-dark mode */
body.quarto-dark {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-sidebar: #0b0f19;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --accent: #818cf8;
    --accent-hover: #6366f1;
    --accent-rgb: 129, 140, 248;
    --border-color: #334155;
    
    --callout-note-bg: rgba(59, 130, 246, 0.15);
    --callout-warning-bg: rgba(245, 158, 11, 0.15);
    --callout-important-bg: rgba(239, 68, 68, 0.15);
    --callout-tip-bg: rgba(16, 185, 129, 0.15);
    --callout-caution-bg: rgba(139, 92, 246, 0.15);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.4), 0 2px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.5), 0 4px 12px -2px rgba(0, 0, 0, 0.4);

    /* Premium Dark Code Blocks (Dark Mode) */
    --code-bg: #0d1117;
    --code-text: #c9d1d9;
    --code-line-hover: rgba(99, 102, 241, 0.15);
}

/* ==========================================================================
   Typography Resets & Base Styles
   ========================================================================== */

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.75;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-top: 1.8em;
    margin-bottom: 0.6em;
}

h1.title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-top: 1rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    padding-bottom: 10px;
}

/* ==========================================================================
   Callouts & Custom Message Boxes
   ========================================================================== */
.tcolorbox, .block {
    border: none;
    border-left: 4px solid #d97706;
    background-color: var(--callout-warning-bg);
    box-shadow: var(--shadow-sm);
    border-radius: 10px;
    padding: 18px;
    margin: 24px 0;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.theorem,
.definition,
.example,
.note,
.tsidebar,
.tcallout,
.tannotation {
    border: none;
    border-left: 4px solid var(--accent);
    background-color: var(--callout-note-bg);
    box-shadow: var(--shadow-sm);
    border-radius: 10px;
    padding: 18px;
    margin: 24px 0;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.theorem:hover,
.definition:hover,
.example:hover,
.note:hover,
.tcolorbox:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Native Quarto Callouts (Note, Warning, Caution, Tip, Important) */
.callout.callout-style-default {
    border: none !important;
    border-radius: 10px !important;
    box-shadow: var(--shadow-sm) !important;
    padding: 18px !important;
    margin: 28px 0 !important;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.callout.callout-style-default:hover {
    box-shadow: var(--shadow-md) !important;
}

.callout-note.callout-style-default {
    border-left: 4px solid var(--callout-note-border) !important;
    background-color: var(--callout-note-bg) !important;
}

.callout-warning.callout-style-default {
    border-left: 4px solid var(--callout-warning-border) !important;
    background-color: var(--callout-warning-bg) !important;
}

.callout-important.callout-style-default {
    border-left: 4px solid var(--callout-important-border) !important;
    background-color: var(--callout-important-bg) !important;
}

.callout-tip.callout-style-default {
    border-left: 4px solid var(--callout-tip-border) !important;
    background-color: var(--callout-tip-bg) !important;
}

.callout-caution.callout-style-default {
    border-left: 4px solid var(--callout-caution-border) !important;
    background-color: var(--callout-caution-bg) !important;
}

.callout-header {
    margin-bottom: 8px;
    font-weight: 600 !important;
    color: var(--text-primary) !important;
}

.callout-title {
    font-weight: 600 !important;
    font-size: 0.95rem;
}

.callout-icon-container {
    margin-right: 10px;
}

/* ==========================================================================
   Code Blocks & Syntax Highlighting
   ========================================================================== */
div.sourceCode {
    background-color: var(--code-bg) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 12px !important;
    box-shadow: var(--shadow-md) !important;
    margin: 28px 0 !important;
    padding: 0 !important;
    overflow: hidden !important;
}

pre.sourceCode {
    background-color: transparent !important;
    border: none !important;
    box-shadow: none !important;
    margin: 0 !important;
    padding: 18px !important;
    overflow-x: auto !important;
}

pre.sourceCode code {
    font-family: var(--font-mono) !important;
    font-size: 0.9rem !important;
    color: var(--code-text) !important;
    background: transparent !important;
    padding: 0 !important;
}

pre.sourceCode code>span {
    display: inline-block;
    width: 100%;
    padding: 0 4px;
    transition: background-color 0.15s ease;
}

/* Soft hover line highlight instead of bright yellow */
pre>code.sourceCode>span:hover {
    background-color: var(--code-line-hover) !important;
    border-radius: 4px;
}

/* Inline code tags */
code:not(pre code) {
    background-color: var(--bg-secondary) !important;
    color: #db2777; /* Soft violet/pink for accent inline code */
    font-family: var(--font-mono) !important;
    font-size: 0.85em !important;
    padding: 3px 7px !important;
    border-radius: 6px !important;
    border: 1px solid var(--border-color) !important;
    white-space: nowrap;
}

body.quarto-dark code:not(pre code) {
    color: #f472b6;
    background-color: var(--bg-secondary) !important;
}

pre.text {
    background: var(--bg-secondary) !important;
    border-left: 3px solid var(--accent) !important;
    border-radius: 0 8px 8px 0 !important;
    padding: 14px 18px !important;
    font-family: var(--font-mono) !important;
    color: var(--text-primary) !important;
    border-top: none;
    border-right: none;
    border-bottom: none;
}

/* ==========================================================================
   Sidebar, Navigation & Table of Contents (TOC)
   ========================================================================== */
.sidebar nav[role="doc-toc"] ul>li>a,
.sidebar-navigation a {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 2px solid transparent;
    padding: 6px 12px !important;
    color: var(--text-secondary);
}

/* TOC levels styling */
.sidebar nav[role="doc-toc"] ul>li>a {
    color: var(--text-primary);
    font-weight: 500;
}

.sidebar nav[role="doc-toc"] ul>li>ul>li>a {
    color: var(--text-secondary);
    font-size: 0.9em;
}

.sidebar nav[role="doc-toc"] ul>li>ul>li>ul>li>a {
    color: var(--text-secondary);
    opacity: 0.7;
    font-size: 0.85em;
}

/* Active Indicator with soft background and left line */
.sidebar nav[role="doc-toc"] ul li a.active,
.sidebar-navigation .active,
.sidebar-item-container a.active {
    color: var(--accent) !important;
    background-color: rgba(var(--accent-rgb), 0.05) !important;
    border-left: 2px solid var(--accent) !important;
    font-weight: 600;
    border-radius: 0 6px 6px 0;
}

/* Hover effects */
.sidebar nav[role="doc-toc"] ul li a:hover,
.sidebar-navigation a:hover,
.sidebar-item-container a:hover {
    color: var(--text-primary) !important;
    background-color: rgba(var(--accent-rgb), 0.03);
    border-left: 2px solid rgba(var(--accent-rgb), 0.3) !important;
    text-decoration: none;
}

/* Fade unselected items slightly when one item is active */
.sidebar nav[role="doc-toc"] ul li a:not(.active) {
    opacity: 0.8;
}

.sidebar nav[role="doc-toc"] ul li a:hover:not(.active) {
    opacity: 1;
}

/* Case transforms from user original */
div.sidebar-menu-container span.menu-text {
    text-transform: uppercase;
}

div.sidebar-menu-container span.chapter-title {
    text-transform: lowercase;
}

/* ==========================================================================
   Tables
   ========================================================================== */
table {
    width: 100% !important;
    border-collapse: collapse !important;
    margin: 36px 0 !important;
    border-radius: 12px !important;
    overflow: hidden !important;
    box-shadow: var(--shadow-md) !important;
    border: 1px solid var(--border-color) !important;
}

th, td {
    padding: 14px 20px !important;
    text-align: left !important;
    border: none !important;
    border-bottom: 1px solid var(--border-color) !important;
}

th {
    background-color: var(--bg-secondary) !important;
    color: var(--text-primary) !important;
    font-weight: 600 !important;
    text-transform: uppercase !important;
    font-size: 0.75rem !important;
    letter-spacing: 0.06em !important;
}

tbody tr {
    transition: background-color 0.2s ease !important;
}

tbody tr:nth-child(odd) {
    background-color: var(--bg-primary) !important;
}

tbody tr:nth-child(even) {
    background-color: rgba(var(--accent-rgb), 0.01) !important;
}

tbody tr:hover {
    background-color: rgba(var(--accent-rgb), 0.04) !important;
    cursor: pointer !important;
}

/* ==========================================================================
   Images, Figures & Figures Hover Zoom
   ========================================================================== */
img {
    max-width: 100%;
    height: auto;
    border-radius: 12px !important;
    border: 1px solid var(--border-color) !important;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
    margin-left: auto;
    margin-right: auto;
}

img:hover {
    transform: scale(1.015);
    box-shadow: var(--shadow-lg);
    border-color: rgba(var(--accent-rgb), 0.3) !important;
}

figure {
    text-align: center;
    margin: 36px 0;
}

figure>figcaption {
    text-align: center !important;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 14px;
    font-weight: 500;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.edit-btn {
    background-color: var(--accent) !important;
    color: white !important;
    border: none !important;
    padding: 10px 18px !important;
    border-radius: 8px !important;
    font-weight: 600 !important;
    box-shadow: var(--shadow-sm) !important;
    transition: all 0.2s ease !important;
}

.edit-btn:hover {
    background-color: var(--accent-hover) !important;
    box-shadow: var(--shadow-md) !important;
}