/* @import Google Fonts for crisp, premium typography */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: #334155; /* slate-700 for smooth, highly readable text */
    background-color: #ffffff;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Headings with premium geometric Plus Jakarta Sans font and tight letter spacing */
h1, h2, h3, h4, h5, h6 {
    font-family: "Plus Jakarta Sans", sans-serif;
    color: #0f172a; /* slate-900 */
    font-weight: 600;
    letter-spacing: -0.025em;
    margin-top: 2rem;
    margin-bottom: 0.9rem;
}

h1 {
    font-weight: 700;
    font-size: 2.4rem;
    letter-spacing: -0.03em;
    border-bottom: none;
    margin-top: 1rem;
    margin-bottom: 1.8rem;
    background: linear-gradient(135deg, #0f172a 30%, #475569 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 1.2rem;
    font-weight: 500;
    letter-spacing: -0.015em;
}

/* Paragraph spacing */
p {
    margin-bottom: 1.25rem;
}

/* Minimalist premium Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #f1f5f9 !important;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.02) !important;
    padding: 0.85rem 2rem;
}

.navbar-brand {
    font-family: "Plus Jakarta Sans", sans-serif;
    font-weight: 700 !important;
    font-size: 1.05rem !important;
    color: #0f172a !important;
    letter-spacing: -0.02em;
}

.navbar-nav .nav-link {
    color: #64748b !important; /* slate-500 */
    font-size: 0.9rem !important;
    font-weight: 500 !important;
    padding: 0.25rem 0.8rem !important;
    transition: color 0.15s ease-in-out;
}

.navbar-nav .nav-link:hover, 
.navbar-nav .nav-link.active {
    color: #4f46e5 !important; /* Premium Indigo accent */
}

/* Sidebar Styling */
.sidebar {
    background-color: #ffffff !important;
    border-right: 1px solid #f1f5f9 !important;
    padding-top: 2rem;
}

.sidebar-title {
    font-family: "Plus Jakarta Sans", sans-serif;
    font-weight: 700 !important;
    color: #475569 !important; /* slate-600 */
    font-size: 0.75rem !important;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
}

.sidebar-link {
    color: #64748b !important;
    font-size: 0.875rem !important;
    font-weight: 500 !important;
    padding: 6px 14px !important;
    border-radius: 6px;
    margin-bottom: 2px;
    transition: all 0.15s ease;
}

.sidebar-link:hover {
    color: #4f46e5 !important;
    background-color: #f8fafc !important;
}

.sidebar-link.active {
    color: #4f46e5 !important;
    background-color: #e0e7ff !important; /* Soft Indigo background for active item */
    font-weight: 600 !important;
}

/* Callout Blocks (Alerts) */
.callout {
    border-left: 3px solid #4f46e5 !important;
    background-color: #f8fafc !important;
    border-radius: 0 8px 8px 0 !important;
    border-top: none !important;
    border-right: none !important;
    border-bottom: none !important;
    padding: 1.25rem 1.5rem !important;
    margin: 1.75rem 0 !important;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.01) !important;
}

.callout-title {
    font-family: "Plus Jakarta Sans", sans-serif;
    font-weight: 600 !important;
    color: #0f172a !important;
    font-size: 0.95rem !important;
    margin-bottom: 0.4rem;
}

/* Code block formatting with JetBrains Mono */
pre, code {
    font-family: "JetBrains Mono", SFMono-Regular, Consolas, Menlo, monospace !important;
    font-size: 0.85rem !important;
    background-color: #f8fafc !important;
    border: 1px solid #e2e8f0 !important;
    border-radius: 6px !important;
}

code {
    padding: 2px 6px !important;
    color: #0f172a;
    font-weight: 500;
}

/* Inline code in regular text should not have heavy borders */
p code {
    background-color: #f1f5f9 !important;
    border: none !important;
    border-radius: 4px !important;
    padding: 2px 4px !important;
}

/* Premium Quarto Code Collapse Toggle Button */
.quarto-code-collapse-toggle {
    font-family: "Plus Jakarta Sans", sans-serif;
    font-size: 0.75rem !important;
    font-weight: 600 !important;
    color: #475569 !important;
    background: #f1f5f9 !important;
    border: 1px solid #e2e8f0 !important;
    border-radius: 6px !important;
    padding: 4px 10px !important;
    transition: all 0.15s ease;
}

.quarto-code-collapse-toggle:hover {
    color: #ffffff !important;
    background: #4f46e5 !important;
    border-color: #4f46e5 !important;
}

/* TOC (Table of Contents) Styling */
#TOC {
    border-left: 1px solid #f1f5f9;
    padding-left: 1rem;
}

#TOC li a {
    color: #64748b;
    font-size: 0.85rem;
    transition: color 0.15s ease;
}

#TOC li a:hover, #TOC li a.active {
    color: #4f46e5;
}

/* Mermaid graph styling refinements */
.mermaid {
    background: #ffffff;
    padding: 1.5rem;
    border: 1px solid #f1f5f9;
    border-radius: 8px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.02);
}