:root {
    --primary-color: #FF4B4B;
    --background-color: #FFFFFF;
    --secondary-background-color: #FAFAFA;
    --text-color: #262730;
    --muted-text-color: #808495;
    --border-color: #E6E9EF;
    --hover-color: #F0F2F6;
    --code-background: #F8F9FA;
    --sidebar-width: 280px;
}

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

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

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

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--secondary-background-color);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    margin-bottom: 2rem;
}

.sidebar-header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-header .logo {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary-color), #FF6B6B);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1rem;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--muted-text-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.nav-link {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 6px;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

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

.nav-link.active {
    background-color: #FFE8E8;
    color: var(--primary-color);
    font-weight: 500;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2rem 3rem;
    max-width: 1200px;
}

.page-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.page-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--muted-text-color);
    font-size: 1rem;
}

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

.document-item {
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.document-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(255, 75, 75, 0.1);
}

.document-item a {
    text-decoration: none;
    color: inherit;
}

.document-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.document-title::before {
    content: "📄";
    font-size: 1.2rem;
}

.document-meta {
    font-size: 0.85rem;
    color: var(--muted-text-color);
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.document-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.document-description {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--muted-text-color);
}

.document-content {
    background-color: var(--background-color);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.document-content h1 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.document-content h2 {
    font-size: 1.4rem;
    margin: 2rem 0 1rem;
    color: var(--text-color);
}

.document-content h3 {
    font-size: 1.1rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-color);
}

.document-content p {
    margin-bottom: 1rem;
    text-align: justify;
}

.document-content ul,
.document-content ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.document-content li {
    margin-bottom: 0.5rem;
}

.document-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.document-content a:hover {
    text-decoration: underline;
}

.document-content code {
    background-color: var(--code-background);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9em;
}

.document-content pre {
    background-color: var(--code-background);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.document-content pre code {
    padding: 0;
    background: none;
}

.document-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--muted-text-color);
    font-style: italic;
}

.document-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

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

.document-content th {
    background-color: var(--secondary-background-color);
    font-weight: 600;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted-text-color);
    text-decoration: none;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary-color);
}

.footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.85rem;
    color: var(--muted-text-color);
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-new {
    background-color: #E8F5E9;
    color: #2E7D32;
}

.badge-updated {
    background-color: #E3F2FD;
    color: #1976D2;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }

    .main-content {
        margin-left: 0;
        padding: 1.5rem;
    }
}