/* Variables */
:root {
    /* Colors */
    --brand-blue: #2563EB;
    --dark-blue: #1E40AF;
    --light-blue: #DBEAFE;
    --success-green: #10B981;
    --warning-orange: #F59E0B;
    --error-red: #EF4444;
    --neutral-gray: #6B7280;
    --white: #FFFFFF;
    --light-gray: #F9FAFB;
    --dark-gray: #111827;
    --border-gray: #E5E7EB;
    
    /* Typography */
    --font-heading: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-body: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-code: "Fira Code", "JetBrains Mono", Consolas, Monaco, monospace;
    --font-chinese: "PingFang SC", "Microsoft YaHei", sans-serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Container */
    --container-width: 1280px;
}

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

/* Base Styles */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
}

body:lang(zh) {
    font-family: var(--font-chinese), var(--font-body);
}

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-2xl);
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--brand-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Code Blocks */
code {
    font-family: var(--font-code);
    background-color: #f6f8fa;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

pre {
    background-color: #f6f8fa !important;
    padding: 16px !important;
    overflow-x: auto;
    border-radius: 8px;
    margin: 16px 0;
}

pre code {
    background-color: transparent !important;
    padding: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Syntax highlighting overrides */
.highlight {
    background-color: #f6f8fa !important;
    border-radius: 8px;
}

.highlight pre {
    background-color: #f6f8fa !important;
    margin: 0;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--brand-blue);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--dark-blue);
    color: var(--white);
}

.btn-secondary {
    background-color: transparent;
    color: var(--brand-blue);
    border: 2px solid var(--brand-blue);
}

.btn-secondary:hover {
    background-color: var(--light-blue);
}

.btn-tertiary {
    background-color: var(--dark-gray);
    color: var(--white);
}

.btn-tertiary:hover {
    background-color: #374151;
    color: var(--white);
}

/* Header */
.site-header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-gray);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.logo-img {
    height: 36px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--brand-blue);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    color: var(--neutral-gray);
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--brand-blue);
}

.github-star a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--light-gray);
    padding: 6px 12px;
    border-radius: 6px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--dark-gray);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--neutral-gray);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Features Section */
.features {
    padding: var(--spacing-3xl) 0;
    background-color: var(--white);
}

.features h2 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background-color: var(--light-gray);
    border: 1px solid var(--border-gray);
    border-radius: 12px;
    padding: var(--spacing-xl);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--neutral-gray);
    margin-bottom: 0;
}

/* Content Section (formerly Quick Start) */
.quickstart {
    padding: var(--spacing-3xl) 0;
    background-color: var(--white);
}

.quickstart h2 {
    margin-top: var(--spacing-3xl);
    margin-bottom: var(--spacing-lg);
    color: var(--dark-gray);
    font-size: 1.875rem;
    font-weight: 600;
}

.quickstart h2:first-of-type {
    margin-top: 0;
}

.quickstart h3 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
    font-size: 1.25rem;
    font-weight: 600;
}

.quickstart hr {
    border: none;
    border-top: 1px solid var(--border-gray);
    margin: var(--spacing-2xl) auto;
    max-width: 800px;
}

.quickstart strong {
    color: var(--dark-gray);
    font-weight: 600;
}

.docs-cta {
    text-align: center;
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--border-gray);
}

/* Content Lists - Better styling for bullet points */
.quickstart ul,
.page-content ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: var(--spacing-xl);
}

.quickstart ul li,
.page-content ul li {
    position: relative;
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.quickstart ul li::before,
.page-content ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-green);
    font-weight: bold;
    font-size: 1.2em;
}

.quickstart ul li strong {
    color: var(--brand-blue);
    font-weight: 600;
}

/* Quick Start content styling */
.quickstart > p {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    color: var(--neutral-gray);
    font-size: 1rem;
    line-height: 1.7;
}

.quickstart ul {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Architecture Section */
.architecture {
    padding: var(--spacing-3xl) 0;
    background-color: var(--white);
}

.architecture h2 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.architecture-diagram {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.diagram-ascii {
    background-color: #f6f8fa;
    padding: 16px;
    border-radius: 8px;
    font-size: 0.875rem;
    overflow-x: auto;
    display: inline-block;
    text-align: left;
}


/* Statistics Section */
.statistics {
    padding: var(--spacing-3xl) 0;
    background-color: var(--light-blue);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.stat-card {
    background-color: var(--white);
    border-radius: 12px;
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.stat-label {
    color: var(--neutral-gray);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    color: var(--brand-blue);
    font-size: 2rem;
    font-weight: 700;
}

/* Content Page */
.content-page {
    padding: var(--spacing-3xl) 0;
    min-height: 60vh;
}

.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    margin-bottom: var(--spacing-sm);
}

.page-header .description {
    color: var(--neutral-gray);
    font-size: 1.125rem;
}

.page-content {
    max-width: 900px;
    line-height: 1.8;
}

.page-content h2,
.page-content h3 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
}

.page-content p {
    margin-bottom: var(--spacing-lg);
    color: var(--dark-gray);
}

.page-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.page-content strong {
    color: var(--brand-blue);
    font-weight: 600;
}

.page-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
}

.page-content th,
.page-content td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-gray);
    text-align: left;
}

.page-content th {
    background-color: var(--light-gray);
    font-weight: 600;
}

.page-footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-gray);
    color: var(--neutral-gray);
    font-size: 0.875rem;
}

/* Page List */
.page-list {
    margin-top: var(--spacing-xl);
}

.page-item {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    transition: box-shadow 0.2s ease;
}

.page-item:hover {
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.page-item h2 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.page-item h2 a {
    color: var(--dark-gray);
}

.page-item h2 a:hover {
    color: var(--brand-blue);
}

.page-item time {
    color: var(--neutral-gray);
    font-size: 0.875rem;
}

/* Taxonomy List */
.taxonomy-list {
    margin-top: var(--spacing-xl);
}

.taxonomy-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--brand-blue);
    background-color: var(--light-gray);
}

.taxonomy-item h2 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

/* Footer */
.site-footer {
    background-color: var(--dark-gray);
    color: var(--light-gray);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--light-gray);
}

.footer-section a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #374151;
}

.footer-bottom p {
    margin-bottom: var(--spacing-sm);
    color: var(--neutral-gray);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .features-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    /* Tables on mobile */
    .page-content table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
    
    /* Code blocks on mobile */
    pre {
        font-size: 0.75rem;
        padding: var(--spacing-sm);
    }
    
    /* Lists on mobile */
    .quickstart ul li,
    .page-content ul li {
        padding-left: var(--spacing-lg);
        font-size: 0.95rem;
    }
    
    /* Why ElasticRelay section on mobile */
    .quickstart h3:first-of-type + ul {
        padding: var(--spacing-md);
    }
    
    /* Quick Start titles on mobile */
    .quickstart h2 {
        font-size: 1.5rem;
    }
    
    .quickstart h3 {
        font-size: 1.125rem;
    }
    
    /* Code blocks on mobile */
    pre {
        padding: 12px;
        font-size: 0.8rem;
    }
    
    /* Architecture diagram on mobile */
    .diagram-ascii {
        padding: 12px;
        font-size: 0.75rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Print styles */
@media print {
    .site-header,
    .site-footer,
    .hero-cta,
    .mobile-menu-toggle {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: black;
        background: white;
    }
    
    a {
        text-decoration: underline;
    }
    
    pre {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}