/* ============================================
   PowerFlow Paper Solutions - CD Control System
   Professional Documentation Stylesheet
   ============================================ */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@400;500&family=Archivo:wght@400;500;600;700;800&display=swap');

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
    /* Primary Brand Colors - Industrial Blue */
    --color-primary: #0D47A1;
    --color-primary-dark: #002171;
    --color-primary-light: #5472D3;
    --color-primary-surface: #E3F2FD;

    /* Accent - Industrial Orange */
    --color-accent: #E65100;
    --color-accent-light: #FF833A;

    /* Semantic Colors */
    --color-success: #1B5E20;
    --color-success-bg: #E8F5E9;
    --color-warning: #E65100;
    --color-warning-bg: #FFF3E0;
    --color-error: #B71C1C;
    --color-error-bg: #FFEBEE;
    --color-info: #01579B;
    --color-info-bg: #E1F5FE;

    /* Neutral Palette - Warm Industrial */
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #EEEEEE;
    --color-gray-300: #E0E0E0;
    --color-gray-400: #BDBDBD;
    --color-gray-500: #9E9E9E;
    --color-gray-600: #757575;
    --color-gray-700: #616161;
    --color-gray-800: #424242;
    --color-gray-900: #212121;

    /* Background & Surface */
    --bg-page: #FAFAFA;
    --bg-surface: #FFFFFF;
    --bg-sidebar: #F8F9FA;
    --bg-code: #263238;

    /* Text Colors */
    --text-primary: #1A1A1A;
    --text-secondary: #5A5A5A;
    --text-muted: #8A8A8A;
    --text-inverse: #FFFFFF;
    --text-link: #0D47A1;
    --text-link-hover: #002171;

    /* Typography */
    --font-display: 'Archivo', 'Segoe UI', sans-serif;
    --font-body: 'IBM Plex Sans', 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', 'Consolas', monospace;

    /* Font Sizes - Modular Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Layout */
    --sidebar-width: 280px;
    --header-height: 64px;
    --content-max-width: 900px;
    --border-radius: 6px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-page);
    min-height: 100vh;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-primary);
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
}

h1 {
    font-size: var(--text-4xl);
    font-weight: 800;
    letter-spacing: -0.02em;
    border-bottom: 3px solid var(--color-primary);
    padding-bottom: var(--space-4);
    margin-top: 0;
}

h2 {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary-dark);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--color-gray-200);
}

h3 {
    font-size: var(--text-xl);
    font-weight: 600;
}

h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-secondary);
}

p {
    margin-bottom: var(--space-4);
    max-width: 75ch;
}

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

a:hover {
    color: var(--text-link-hover);
    text-decoration: underline;
}

strong {
    font-weight: 600;
}

/* ============================================
   Site Header
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

/* Header Brand Link - Clickable Home */
.header-brand-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: opacity var(--transition-fast);
}

.header-brand-link:hover {
    opacity: 0.9;
    text-decoration: none;
}

.header-brand-link:hover .header-brand {
    transform: translateY(-1px);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    transition: transform var(--transition-fast);
}

.header-logo {
    height: 40px;
    width: auto;
}

.header-title {
    display: flex;
    flex-direction: column;
}

.header-company {
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.header-product {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text-inverse);
    letter-spacing: -0.01em;
}

.header-search {
    position: relative;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius);
    padding: var(--space-2) var(--space-4);
    transition: background var(--transition-base);
}

.header-search:focus-within {
    background: rgba(255, 255, 255, 0.25);
}

.header-search input {
    background: transparent;
    border: none;
    color: var(--text-inverse);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    width: 220px;
    outline: none;
}

.header-search input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.header-search-icon {
    width: 18px;
    height: 18px;
    margin-right: var(--space-2);
    opacity: 0.7;
}

.header-nav {
    display: flex;
    gap: var(--space-6);
}

.header-nav a {
    color: rgba(255, 255, 255, 0.85);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.header-nav a:hover {
    color: var(--text-inverse);
    text-decoration: none;
}

/* Product Home link styling */
.header-nav a.nav-home-link {
    background: rgba(255, 255, 255, 0.15);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--border-radius);
    font-weight: 600;
}

.header-nav a.nav-home-link:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* ============================================
   Layout Container
   ============================================ */
.main-container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* ============================================
   Sidebar Navigation
   ============================================ */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--bg-sidebar);
    border-right: 1px solid var(--color-gray-200);
    overflow-y: auto;
    padding: var(--space-6) 0;
    z-index: 100;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

.nav-section {
    margin-bottom: var(--space-2);
}

.nav-section-header {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-6);
    cursor: pointer;
    transition: background var(--transition-fast);
    user-select: none;
}

.nav-section-header:hover {
    background: var(--color-gray-100);
}

.nav-section-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: var(--text-inverse);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 700;
    border-radius: 4px;
    margin-right: var(--space-3);
    flex-shrink: 0;
}

.nav-section-title {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.nav-section-arrow {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-base);
    opacity: 0.5;
}

.nav-section.expanded .nav-section-arrow {
    transform: rotate(90deg);
}

.nav-items {
    list-style: none;
    padding: 0;
    margin: 0;
    display: none;
    background: var(--bg-surface);
    border-top: 1px solid var(--color-gray-100);
    border-bottom: 1px solid var(--color-gray-100);
}

.nav-section.expanded .nav-items {
    display: block;
}

.nav-items li {
    border-bottom: 1px solid var(--color-gray-100);
}

.nav-items li:last-child {
    border-bottom: none;
}

.nav-items a {
    display: block;
    padding: var(--space-3) var(--space-6);
    padding-left: calc(var(--space-6) + 24px + var(--space-3));
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.nav-items a:hover {
    background: var(--color-primary-surface);
    color: var(--color-primary);
    text-decoration: none;
}

.nav-items a.active {
    background: var(--color-primary-surface);
    color: var(--color-primary);
    font-weight: 500;
    border-left: 3px solid var(--color-primary);
}

/* ============================================
   Main Content Area
   ============================================ */
.content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: var(--space-8) var(--space-10);
    max-width: calc(var(--content-max-width) + var(--space-20));
}

/* Breadcrumb Navigation */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: var(--space-6);
}

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

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

.breadcrumb-separator {
    color: var(--color-gray-400);
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 500;
}

/* Page Title */
.page-title {
    margin-bottom: var(--space-8);
}

/* Table of Contents */
.toc {
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
}

.toc h3 {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin: 0 0 var(--space-4) 0;
}

.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-2);
}

.toc li a {
    display: block;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.toc li a:hover {
    background: var(--color-primary-surface);
    color: var(--color-primary);
    text-decoration: none;
}

/* ============================================
   Content Elements
   ============================================ */

/* Lists */
ul, ol {
    margin-bottom: var(--space-4);
    padding-left: var(--space-6);
}

li {
    margin-bottom: var(--space-2);
}

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

/* Tables */
.table-wrapper {
    overflow-x: auto;
    margin: var(--space-6) 0;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
    background: var(--bg-surface);
}

thead {
    background: var(--color-primary);
    color: var(--text-inverse);
}

th {
    font-family: var(--font-display);
    font-weight: 600;
    text-align: left;
    padding: var(--space-4) var(--space-5);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: var(--text-xs);
}

td {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-gray-100);
    vertical-align: top;
}

tbody tr:hover {
    background: var(--color-gray-50);
}

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

/* Code Blocks */
pre {
    background: var(--bg-code);
    color: #39FF14;
    padding: var(--space-6);
    border-radius: var(--border-radius-lg);
    overflow-x: auto;
    margin: var(--space-6) 0;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.6;
    box-shadow: var(--shadow-md);
}

pre code {
    background: none;
    padding: 0;
    font-size: inherit;
    color: #39FF14;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-gray-100);
    color: var(--color-primary-dark);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

/* Syntax Highlighting */
.code-keyword { color: #82B1FF; }
.code-string { color: #C3E88D; }
.code-number { color: #F78C6C; }
.code-comment { color: #546E7A; font-style: italic; }
.code-function { color: #82AAFF; }
.code-variable { color: #FFCB6B; }

/* ============================================
   Callout Boxes
   ============================================ */
.callout {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-5);
    margin: var(--space-6) 0;
    border-radius: var(--border-radius-lg);
    border-left: 4px solid;
}

.callout-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

.callout-content {
    flex: 1;
}

.callout-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: var(--space-2);
}

.callout p:last-child {
    margin-bottom: 0;
}

/* Note - Blue */
.callout-note {
    background: var(--color-info-bg);
    border-color: var(--color-info);
}
.callout-note .callout-title { color: var(--color-info); }
.callout-note .callout-icon { color: var(--color-info); }

/* Tip - Green */
.callout-tip {
    background: var(--color-success-bg);
    border-color: var(--color-success);
}
.callout-tip .callout-title { color: var(--color-success); }
.callout-tip .callout-icon { color: var(--color-success); }

/* Warning - Orange */
.callout-warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning);
}
.callout-warning .callout-title { color: var(--color-warning); }
.callout-warning .callout-icon { color: var(--color-warning); }

/* Danger/Caution - Red */
.callout-danger {
    background: var(--color-error-bg);
    border-color: var(--color-error);
}
.callout-danger .callout-title { color: var(--color-error); }
.callout-danger .callout-icon { color: var(--color-error); }

/* ============================================
   Step-by-Step Procedures
   ============================================ */
.procedure {
    list-style: none;
    padding: 0;
    counter-reset: step;
}

.procedure > li {
    counter-increment: step;
    position: relative;
    padding-left: 60px;
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--color-gray-100);
}

.procedure > li:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.procedure > li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: var(--text-inverse);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-lg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.procedure h4 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-3) 0;
}

/* ============================================
   Tabbed Content
   ============================================ */
.tabs {
    margin: var(--space-6) 0;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.tab-buttons {
    display: flex;
    background: var(--color-gray-100);
    border-bottom: 2px solid var(--color-gray-200);
}

.tab-btn {
    flex: 1;
    padding: var(--space-4) var(--space-6);
    background: transparent;
    border: none;
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.tab-btn:hover {
    background: var(--color-gray-200);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--bg-surface);
    color: var(--color-primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
}

.tab-content {
    display: none;
    padding: var(--space-6);
    background: var(--bg-surface);
}

.tab-content.active {
    display: block;
}

/* ============================================
   Figures & Images
   ============================================ */
figure {
    margin: var(--space-8) 0;
}

figure img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-gray-200);
}

figcaption {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    text-align: center;
    margin-top: var(--space-3);
    font-style: italic;
}

/* Image Placeholder */
.image-placeholder {
    background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-200) 100%);
    border: 2px dashed var(--color-gray-300);
    border-radius: var(--border-radius-lg);
    padding: var(--space-12) var(--space-8);
    text-align: center;
    margin: var(--space-6) 0;
}

.image-placeholder-icon {
    font-size: 48px;
    color: var(--color-gray-400);
    margin-bottom: var(--space-4);
}

.image-placeholder-text {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-weight: 500;
}

/* ============================================
   Page Navigation (Prev/Next)
   ============================================ */
.page-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--space-6);
    margin-top: var(--space-16);
    padding-top: var(--space-8);
    border-top: 2px solid var(--color-gray-200);
}

.page-nav-link {
    display: flex;
    flex-direction: column;
    padding: var(--space-5) var(--space-6);
    background: var(--bg-surface);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    transition: all var(--transition-base);
    min-width: 200px;
}

.page-nav-link:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.page-nav-link.prev {
    align-items: flex-start;
}

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

.page-nav-label {
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-1);
}

.page-nav-title {
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-primary);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    margin-left: var(--sidebar-width);
    background: var(--color-gray-900);
    color: var(--text-inverse);
    padding: var(--space-8) var(--space-10);
    text-align: center;
}

.footer-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
}

.footer-brand {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.footer-version {
    font-size: var(--text-sm);
    color: var(--color-gray-400);
    margin-bottom: var(--space-4);
}

.footer-copyright {
    font-size: var(--text-xs);
    color: var(--color-gray-500);
}

/* ============================================
   Home Page Cards
   ============================================ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
    margin: var(--space-8) 0;
}

.card {
    background: var(--bg-surface);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    transition: all var(--transition-base);
    text-decoration: none;
    display: block;
}

.card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    text-decoration: none;
}

.card-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    color: var(--text-inverse);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 700;
    border-radius: 6px;
    margin-bottom: var(--space-4);
}

.card-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.card-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
}

/* ============================================
   Quick Start Steps
   ============================================ */
.quick-steps {
    display: flex;
    gap: var(--space-4);
    margin: var(--space-8) 0;
    flex-wrap: wrap;
}

.quick-step {
    flex: 1;
    min-width: 150px;
    text-align: center;
    padding: var(--space-6);
    background: var(--bg-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.quick-step::after {
    content: '';
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    border: 10px solid transparent;
    border-left-color: var(--color-primary);
}

.quick-step:last-child::after {
    display: none;
}

.quick-step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--text-inverse);
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: var(--space-4);
}

.quick-step-title {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
}

/* ============================================
   Keyboard Shortcuts
   ============================================ */
kbd {
    display: inline-block;
    padding: 0.15em 0.5em;
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: 4px;
    box-shadow: 0 2px 0 var(--color-gray-300);
}

/* ============================================
   Search Results
   ============================================ */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    margin-top: var(--space-2);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 1001;
}

.search-results.active {
    display: block;
}

.search-result {
    display: flex;
    flex-direction: column;
    padding: var(--space-3) var(--space-4);
    text-decoration: none;
    border-bottom: 1px solid var(--color-gray-100);
    transition: background var(--transition-fast);
}

.search-result:last-child {
    border-bottom: none;
}

.search-result:hover {
    background: var(--color-primary-surface);
    text-decoration: none;
}

.search-result-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.search-result-title mark {
    background: var(--color-warning-bg);
    color: var(--color-warning);
    padding: 0 2px;
    border-radius: 2px;
}

.search-result-section {
    font-size: var(--text-xs);
    color: var(--text-muted);
}

.search-no-results {
    padding: var(--space-4);
    text-align: center;
    color: var(--text-muted);
    font-size: var(--text-sm);
}

/* ============================================
   Mobile Overlay & Menu Button
   ============================================ */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-inverse);
    padding: var(--space-2);
    cursor: pointer;
}

.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: var(--text-inverse);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

/* ============================================
   Code Block Copy Button
   ============================================ */
.code-block {
    position: relative;
}

.code-copy-btn {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-inverse);
}

.code-copy-btn.copied {
    background: var(--color-success);
    border-color: var(--color-success);
    color: var(--text-inverse);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .mobile-menu-btn {
        display: block;
    }
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .content {
        margin-left: 0;
    }

    .site-footer {
        margin-left: 0;
    }

    .header-search {
        display: none;
    }
}

@media (max-width: 768px) {
    .page-nav {
        flex-direction: column;
    }

    .page-nav-link {
        width: 100%;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .quick-steps {
        flex-direction: column;
    }

    .quick-step::after {
        display: none;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .site-header,
    .sidebar,
    .header-search,
    .page-nav,
    .toc {
        display: none !important;
    }

    .content {
        margin-left: 0;
        max-width: 100%;
        padding: 0;
    }

    .site-footer {
        margin-left: 0;
    }

    body {
        font-size: 12pt;
        background: white;
    }

    h1, h2, h3 {
        page-break-after: avoid;
    }

    pre, table, figure {
        page-break-inside: avoid;
    }

    a {
        color: inherit;
        text-decoration: underline;
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}