:root {
    --primary-color: #1a73e8;
    --primary-light: #e8f0fe;
    --primary-dark: #0d47a1;
    --secondary-color: #34a853;
    --accent-color: #fbbc04;
    --danger-color: #ea4335;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-tertiary: #80868b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --border-color: #dadce0;
    --sidebar-width: 280px;
    --header-height: 64px;
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-md: 0 2px 6px 2px rgba(60, 64, 67, 0.15), 0 1px 2px 0 rgba(60, 64, 67, 0.3);
    --border-radius: 8px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

html {
    scroll-behavior: smooth;
}

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: transform 0.3s ease;
    z-index: 1000;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.brand-name {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.5rem;
}

.brand-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

.sidebar-nav {
    padding: 16px 0;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: 2px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 0 50px 50px 0;
    transition: all 0.2s ease;
}

.nav-link i {
    margin-right: 12px;
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--primary-light);
}

.nav-link.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
    font-weight: 500;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    transition: margin 0.3s ease;
}

.header-bar {
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 900;
    box-shadow: var(--shadow-sm);
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    margin-right: 16px;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.content-container {
    padding: 24px 32px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Sections */
.section {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    overflow: hidden;
}

.section-header {
    padding: 16px 24px;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.section-title i {
    margin-right: 12px;
}

.section-toggle {
    color: var(--text-tertiary);
    transform: rotate(0);
    transition: transform 0.3s ease;
    cursor: pointer;
}

.section.collapsed .section-toggle {
    transform: rotate(180deg);
}

.section-content {
    max-height: 99999px;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out, opacity 0.3s ease;
    opacity: 1;
    padding: 20px 24px;
}

.section.collapsed .section-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
}

/* Ensure anchored headings don't hide under sticky header */
.section-title[id] {
    scroll-margin-top: calc(var(--header-height) + 12px);
}

/* Highlight effect when navigating to section */
.section:target {
    animation: highlight 1.5s ease-out;
}

@keyframes highlight {
    0% { background-color: rgba(25, 118, 210, 0.1); }
    100% { background-color: transparent; }
}

/* Typography */
h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--primary-dark);
}

h3 {
    font-size: 1.25rem;
    margin: 24px 0 16px;
    color: var(--text-primary);
}

p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

strong, b {
    font-weight: 600;
    color: var(--text-primary);
}

/* Lists */
ul, ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

li {
    margin-bottom: 8px;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
    background-color: var(--bg-tertiary);
}

tr:hover {
    background-color: var(--bg-secondary);
}

/* Code blocks */
pre, code {
    font-family: 'Courier New', Courier, monospace;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
}

code {
    padding: 2px 6px;
    font-size: 0.9em;
}

pre {
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 16px;
}

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

/* Cards and Widgets */
.card {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 16px;
    margin-bottom: 16px;
}

.card-header {
    margin-bottom: 12px;
    font-weight: 600;
}

/* Badges and Tags */
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background-color: var(--secondary-color);
    color: white;
}

.badge-warning {
    background-color: var(--accent-color);
    color: white;
}

.badge-danger {
    background-color: var(--danger-color);
    color: white;
}

.badge-info {
    background-color: var(--primary-color);
    color: white;
}

/* Responsive */
@media (max-width: 991px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-md);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .app-container.sidebar-open .sidebar {
        transform: translateX(0);
    }
    
    .content-container {
        padding: 16px;
    }
}

/* Specific Styles */
.highlight {
    background-color: #fff8e1;
    border-left: 4px solid var(--accent-color);
    padding: 12px 16px;
    margin-bottom: 16px;
}

.code-example {
    background-color: #f5f7f9;
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 16px;
    font-family: 'Courier New', Courier, monospace;
}

.steps-list {
    counter-reset: steps-counter;
    list-style-type: none;
    padding-left: 0;
}

.steps-list li {
    position: relative;
    padding-left: 36px;
    margin-bottom: 16px;
}

.steps-list li::before {
    content: counter(steps-counter);
    counter-increment: steps-counter;
    position: absolute;
    left: 0;
    top: 0;
    width: 24px;
    height: 24px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    background-color: var(--bg-tertiary);
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #1558c0;
    border-color: #1558c0;
}

.btn-secondary {
    background-color: var(--bg-secondary);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.header-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.doc-meta {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

/* Table of Contents */
.toc {
    list-style: none;
    padding-left: 0;
    margin: 8px 0 0;
    display: grid;
    gap: 6px;
}

.toc a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 8px;
    border-radius: 6px;
    display: inline-block;
}

.toc a:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.toc a.active {
    color: var(--primary-color);
    background: var(--primary-light);
    font-weight: 500;
}

/* Print styles */
@media print {
    :root {
        --bg-secondary: #ffffff;
    }

    /* Hide interactive chrome */
    .header-bar,
    .btn,
    .btn-icon,
    .section-toggle { display: none !important; }

    /* Remove shadows and borders for clean print */
    .section,
    .card { box-shadow: none !important; border: 1px solid #ddd; }

    /* Expand all sections for print */
    .section .section-content { max-height: none !important; opacity: 1 !important; overflow: visible !important; }
    .section { break-inside: avoid; page-break-inside: avoid; }

    /* Improve typography on paper */
    body { background: #fff; }
    a[href]::after { content: " (" attr(href) ")"; font-size: 0.85em; color: #666; }
    .content-container { padding: 0; max-width: 100%; }
}