:root {
    /* Color Palette - Modern & Clean */
    --gb-primary: #3b82f6;       /* Blue 500 */
    --gb-primary-dark: #2563eb;  /* Blue 600 */
    --gb-secondary: #10b981;     /* Emerald 500 */
    --gb-accent: #f59e0b;        /* Amber 500 */

    --gb-bg: #0f172a;           /* Slate 900 */
    --gb-surface: #1e293b;      /* Slate 800 */
    --gb-surface-hover: #334155; /* Slate 700 */
    --gb-border: #334155;       /* Slate 700 */
    
    --gb-text-primary: #f8fafc;   /* Slate 50 */
    --gb-text-secondary: #94a3b8; /* Slate 400 */
    --gb-text-muted: #64748b;     /* Slate 500 */

    --gb-success: #22c55e;
    --gb-warning: #eab308;
    --gb-error: #ef4444;

    /* Spacing & Layout */
    --header-height: 64px;
    --sidebar-width: 280px;
    --toc-width: 240px;
    --content-max-width: 900px;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--gb-bg);
    color: var(--gb-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    
    /* Grid Pattern Background */
    background-image: 
        linear-gradient(rgba(51, 65, 85, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(51, 65, 85, 0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: center top;
}

a {
    color: var(--gb-primary);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Layout Grid */
.gb-layout {
    display: grid;
    grid-template-areas: 
        "header header header"
        "sidebar main toc"
        "footer footer footer";
    grid-template-columns: var(--sidebar-width) 1fr var(--toc-width);
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
}

/* Header */
.gb-header {
    grid-area: header;
    height: var(--header-height);
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gb-border);
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    justify-content: space-between;
}

.gb-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--gb-text-primary);
}

.gb-brand img {
    height: 32px;
    width: auto;
}

.gb-nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

/* Search Bar */
.gb-search {
    position: relative;
    margin-right: auto;
    margin-left: 2rem;
    width: 100%;
    max-width: 400px;
}

.gb-search input {
    width: 100%;
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--gb-border);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    color: var(--gb-text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.gb-search input:focus {
    outline: none;
    border-color: var(--gb-primary);
    background: rgba(30, 41, 59, 0.8);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.gb-search i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gb-text-muted);
    pointer-events: none;
}

.gb-nav-link {
    color: var(--gb-text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

.gb-nav-link:hover, .gb-nav-link.active {
    color: var(--gb-primary);
}

/* Development / Version Banner */
.gb-dev-banner {
    width: 100%;
}

.gb-dev-banner-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.35rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
}

.gb-dev-banner-label {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.75rem;
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.25);
}

.gb-dev-banner-text {
    opacity: 0.95;
}

/* Sidebar */
.gb-sidebar {
    grid-area: sidebar;
    background-color: rgba(15, 23, 42, 0.5);
    border-right: 1px solid var(--gb-border);
    height: calc(100vh - var(--header-height));
    position: sticky;
    top: var(--header-height);
    overflow-y: auto;
    padding: 1.5rem;
    scrollbar-width: thin;
    scrollbar-color: var(--gb-border) transparent;
}

.gb-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.gb-sidebar-section {
    margin-bottom: 1.5rem;
}

.gb-sidebar-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gb-text-muted);
    font-weight: 700;
    margin-bottom: 0.75rem;
    padding-left: 0.75rem;
}

.gb-sidebar-link {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    color: var(--gb-text-secondary);
    font-size: 0.9rem;
    transition: background-color 0.1s;
}

.gb-sidebar-link:hover {
    background-color: var(--gb-surface);
    color: var(--gb-text-primary);
}

.gb-sidebar-link.active {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--gb-primary);
    font-weight: 500;
    border-left: 2px solid var(--gb-primary);
    padding-left: calc(0.75rem - 2px);
}

/* Main Content */
.gb-main {
    grid-area: main;
    padding: 2rem 3rem;
    max-width: var(--content-max-width);
    margin: 0 auto;
    width: 100%;
}

.gb-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #f8fafc, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.gb-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--gb-border);
    color: var(--gb-text-primary);
}

.gb-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--gb-text-primary);
}

.gb-content p {
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
    color: var(--gb-text-secondary);
}

.gb-content ul, .gb-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    color: var(--gb-text-secondary);
}

.gb-content li {
    margin-bottom: 0.5rem;
}

.gb-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: rgba(30, 41, 59, 0.5);
    padding: 0.2em 0.4em;
    border-radius: 0.25em;
    color: var(--gb-primary);
    border: 1px solid rgba(51, 65, 85, 0.5);
}

.gb-content pre,
.gb-content .highlight {
    background-color: #0d1117; /* Matches Github Dark */
    padding: 1.25rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
    border: 1px solid var(--gb-border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Reset inner pre when inside highlight (Hugo line numbers) */
.gb-content .highlight pre {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    margin-bottom: 0;
    border: none;
    box-shadow: none;
    overflow: visible;
}

.gb-content .lntable {
    width: 100%;
    border-spacing: 0;
}

.gb-content pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
    font-size: 0.9rem;
    border: none;
}

/* Table of Contents */
.gb-toc {
    grid-area: toc;
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    padding: 2rem 1.5rem;
    border-left: 1px solid var(--gb-border);
    overflow-y: auto;
    background-color: rgba(15, 23, 42, 0.3);
}

.gb-toc-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--gb-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.gb-toc nav ul {
    list-style: none;
    padding: 0;
}

.gb-toc nav ul ul {
    padding-left: 1rem;
    margin-bottom: 0;
}

.gb-toc nav a {
    display: block;
    padding: 0.25rem 0;
    font-size: 0.85rem;
    color: var(--gb-text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.gb-toc nav a:hover {
    color: var(--gb-primary);
}

/* Footer */
.gb-footer {
    grid-area: footer;
    border-top: 1px solid var(--gb-border);
    padding: 2rem;
    text-align: center;
    color: var(--gb-text-muted);
    font-size: 0.9rem;
    background-color: var(--gb-bg);
}

/* Home Page Component Styles - Glassmorphism & Glows */
.gb-feature-card, .gb-version-card, .gb-content-card {
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(51, 65, 85, 0.5);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.gb-feature-card:hover, .gb-version-card:hover, .gb-content-card:hover {
    border-color: var(--gb-primary);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
    background: rgba(30, 41, 59, 0.6);
}

/* Responsive */
@media (max-width: 1024px) {
    .gb-layout {
        grid-template-areas: 
            "header header"
            "sidebar main"
            "footer footer";
        grid-template-columns: var(--sidebar-width) 1fr;
    }

    .gb-toc {
        display: none;
    }
}

@media (max-width: 768px) {
    .gb-layout {
        grid-template-areas: 
            "header"
            "main"
            "footer";
        grid-template-columns: 1fr;
    }

    .gb-sidebar {
        display: none;
    }

    .gb-main {
        padding: 1.5rem;
    }
}