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

:root {
    --header-bg: #2F5D7E;
    --header-text: #FFFFFF;
    --accent-orange: #FF6B35;
    --accent-orange-light: #FF8C5A;
    --heading-color: #4A5568;
    --heading-color-dark: #2D3748;
    --text-color: #2D3748;
    --text-color-light: #718096;
    --bg-white: #FFFFFF;
    --bg-light: #F7FAFC;
    --border-color: #E2E8F0;
    --code-bg: #1A202C;
    --code-text: #E2E8F0;
    --link-color: #2F5D7E;
    --link-hover: #FF6B35;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-white);
}

/* Header Styles */
.site-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-container {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.site-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
}

.site-tagline {
    font-size: 0.875rem;
    margin: 0;
    opacity: 1;
    color: rgba(255, 255, 255, 0.95);
}

.header-nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--header-text);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.2s;
}

.nav-link:hover {
    opacity: 0.8;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--header-text);
    font-size: 1.5rem;
    cursor: pointer;
}

.header-separator {
    height: 3px;
    background-color: var(--accent-orange);
    width: 100%;
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.content-section {
    margin-bottom: 4rem;
    scroll-margin-top: 100px;
}

.section-icon {
    font-size: 2rem;
    margin-right: 0.5rem;
    display: inline-block;
    vertical-align: middle;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--heading-color-dark);
    margin-bottom: 1.5rem;
    line-height: 1.2;
    display: flex;
    align-items: center;
}

.lead-text {
    font-size: 1.25rem;
    color: var(--text-color);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--accent-orange);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-orange-light);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #3D6B8F;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--header-bg);
    border-color: var(--header-bg);
}

.btn-outline:hover {
    background-color: var(--header-bg);
    color: white;
}

/* Content Grids */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.content-card {
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    border-left: 4px solid var(--accent-orange);
}

.content-card h3 {
    color: var(--heading-color-dark);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.content-card p {
    color: var(--text-color-light);
}

/* Feature Lists */
.feature-list {
    list-style: none;
    padding-left: 0;
}

.feature-list li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-color);
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-orange);
    font-weight: bold;
}

/* Principles Grid */
.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.principle-item {
    padding: 1.25rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    border-top: 3px solid var(--accent-orange);
}

.principle-item strong {
    color: var(--heading-color-dark);
    display: block;
    margin-bottom: 0.5rem;
}

/* Code Blocks */
.code-block {
    background-color: var(--code-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
}

.code-block.small {
    padding: 1rem;
}

.code-block pre {
    margin: 0;
    color: var(--code-text);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.code-block code {
    color: var(--code-text);
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.spec-table thead {
    background-color: var(--header-bg);
    color: var(--header-text);
}

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

.spec-table tbody tr:hover {
    background-color: var(--bg-light);
}

.spec-table code {
    background-color: var(--bg-light);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    color: var(--accent-orange);
}

/* Message Types */
.message-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.message-type-card {
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    border-top: 4px solid var(--accent-orange);
}

.message-type-card h4 {
    color: var(--heading-color-dark);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.message-type-card .examples {
    margin-top: 0.75rem;
    font-size: 0.9rem;
}

.message-type-card code {
    background-color: var(--bg-white);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    color: var(--accent-orange);
}

/* Plugins Grid */
.plugins-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.plugin-card {
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    border-left: 4px solid var(--accent-orange);
}

.plugin-card h4 {
    color: var(--heading-color-dark);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.plugin-card p {
    color: var(--text-color-light);
    font-size: 0.95rem;
}

.plugin-card code {
    background-color: var(--bg-white);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    color: var(--accent-orange);
}

/* Highlight Section */
.highlight-section {
    background: linear-gradient(135deg, var(--bg-light) 0%, #E8F4F8 100%);
    padding: 3rem;
    border-radius: 12px;
    border-left: 6px solid var(--accent-orange);
}

.origin-quote {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.origin-quote p {
    margin-bottom: 1rem;
}

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

/* Docs Grid */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.doc-card {
    padding: 2rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    border-top: 4px solid var(--accent-orange);
    transition: transform 0.2s, box-shadow 0.2s;
}

.doc-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.doc-card h3 {
    color: var(--heading-color-dark);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.doc-card p {
    color: var(--text-color-light);
    margin-bottom: 1rem;
}

.doc-link {
    color: var(--accent-orange);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    margin-top: 0.5rem;
}

.doc-link:hover {
    text-decoration: underline;
}

/* Footer */
.site-footer {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--header-text);
    text-decoration: none;
    opacity: 0.9;
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .site-title {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .lead-text {
        font-size: 1.1rem;
    }

    .main-content {
        padding: 2rem 1rem;
    }

    .content-grid,
    .principles-grid,
    .message-types,
    .plugins-grid,
    .docs-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .highlight-section {
        padding: 2rem 1.5rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Link Styles */
a {
    color: var(--link-color);
    transition: color 0.2s;
}

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

/* Headings */
h3 {
    color: var(--heading-color-dark);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

h4 {
    color: var(--heading-color);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-color);
}