/* Web4 Whitepaper Styles */
:root {
    --primary-color: #374151;
    --secondary-color: #64748b;
    --background: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --code-bg: #f8fafc;
    --sidebar-width: 280px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--background);
}

/* Layout */
.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    width: var(--sidebar-width);
    background: #f8fafc;
    border-right: 1px solid var(--border-color);
    padding: 2rem 1rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

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

.nav-list li {
    margin-bottom: 0.5rem;
}

.nav-list a {
    color: var(--text-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    display: block;
    border-radius: 4px;
    transition: all 0.2s;
}

.nav-list a:hover {
    background: white;
    color: var(--primary-color);
}

.nav-list a.active {
    background: var(--primary-color);
    color: white;
}

/* Expandable Navigation */
.expandable {
    position: relative;
}

.expand-icon {
    display: inline-block;
    transition: transform 0.3s ease;
    margin-left: 0.5rem;
    font-size: 0.8rem;
    float: right;
    margin-top: 0.2rem;
}

.expandable.expanded .expand-icon {
    transform: rotate(90deg);
}

.sub-nav {
    list-style: none;
    padding: 0;
    margin: 0 0 0 1.5rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.sub-nav-link {
    font-size: 0.9rem !important;
    padding: 0.4rem 0.75rem !important;
    opacity: 0.9;
}

.sub-nav-link:hover {
    opacity: 1;
    background: white !important;
}

.sub-nav-link.active {
    background: var(--secondary-color) !important;
    color: white !important;
    opacity: 1;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 3rem;
    max-width: 900px;
}

/* Section Pages */
.section {
    display: none;
    animation: fadeIn 0.3s;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Typography */
h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 2rem;
    margin: 2rem 0 1rem;
    color: var(--text-color);
}

h3 {
    font-size: 1.5rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-color);
}

h4 {
    font-size: 1.25rem;
    margin: 1rem 0 0.5rem;
    color: var(--text-color);
}

p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* Lists */
ul, ol {
    margin: 1rem 0 1rem 2rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Code */
code {
    background: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

pre {
    background: var(--code-bg);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
}

pre code {
    background: none;
    padding: 0;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border: 1px solid var(--border-color);
}

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

/* Blockquotes */
blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--secondary-color);
    font-style: italic;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .main-content {
        margin-left: 0;
        padding: 2rem 1rem;
    }
    
    .container {
        flex-direction: column;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #0f172a;
        --text-color: #e2e8f0;
        --border-color: #334155;
        --code-bg: #1e293b;
    }
    
    .sidebar {
        background: #1e293b;
    }
    
    .nav-list a:hover {
        background: #334155;
    }
    
    th {
        background: #1e293b;
    }
}

/* Table of Contents within sections */
.section-toc {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin: 1rem 0 2rem 0;
}

.section-toc h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1rem;
    color: var(--primary-color);
}

.section-toc ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.section-toc li {
    margin: 0.25rem 0;
}

.section-toc a {
    color: var(--secondary-color);
    text-decoration: none;
    display: block;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    transition: all 0.2s;
}

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

/* Print Styles */
@media print {
    .sidebar {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
        max-width: 100%;
    }
    
    .section {
        display: block !important;
        page-break-after: always;
    }
    
    .section-toc {
        display: none;
    }
}