* {
    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: #404040;
}

/* Main Container */
.container {
    display: flex;
    margin-top: 50px;
    min-height: calc(100vh - 50px);
}

/* Sidebar */
.sidebar {
    width: 300px;
    background: #f9f9f9;
    border-right: 1px solid #e1e4e5;
    position: fixed;
    left: 0;
    top: 50px;
    bottom: 0;
    overflow-y: auto;
    padding: 20px 0;
}

.sidebar-content {
    padding: 0 20px;
}

.sidebar h3 {
    color: #2980b9;
    font-size: 16px;
    margin: 20px 0 10px 0;
    font-weight: 600;
}

.sidebar h3::before,
.sidebar h3::after {
    content: none !important;
}

.sidebar ul {
    list-style: none;
    margin: 0 0 15px 0;
}

.sidebar li {
    margin: 5px 0;
}

.sidebar a {
    color: #404040;
    text-decoration: none;
    display: block;
    padding: 5px 10px;
    border-radius: 3px;
    font-size: 14px;
    transition: background 0.2s;
    cursor: pointer;
}

.sidebar a:hover,
.sidebar a.active {
    background: #e1e4e5;
    color: #2980b9;
}

/* Main Content */
.main-content {
    margin-left: 300px;
    padding: 40px 60px;
    max-width: 1000px;
    flex: 1;
}

.main-content h1 {
    color: #2c3e50;
    font-size: 2.5em;
    margin-bottom: 20px;
    font-weight: 600;
}

.main-content h2 {
    color: #2c3e50;
    font-size: 1.8em;
    margin: 40px 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid #e1e4e5;
    font-weight: 600;
}

.main-content h3 {
    color: #2c3e50;
    font-size: 1.3em;
    margin: 30px 0 15px 0;
    font-weight: 600;
}

.main-content h3::after {
    content: none !important;
}

.main-content p {
    margin-bottom: 15px;
    line-height: 1.7;
}

.main-content ul {
    margin: 15px 0 15px 30px;
}

.main-content li {
    margin: 8px 0;
}

.main-content code {
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: #e74c3c;
}

.main-content pre {
    background: #f8f8f8;
    border: 1px solid #e1e4e5;
    border-left: 3px solid #2980b9;
    padding: 15px;
    border-radius: 3px;
    overflow-x: auto;
    margin: 20px 0;
}

.main-content pre code {
    background: none;
    padding: 0;
    color: #333;
}

.note {
    background: #e7f2fa;
    border-left: 4px solid #2980b9;
    padding: 15px;
    margin: 20px 0;
    border-radius: 3px;
}

.note-title {
    font-weight: 600;
    color: #2980b9;
    margin-bottom: 8px;
}

hr {
    border: none;
    border-top: 1px solid #e1e4e5;
    margin: 30px 0;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #666;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    .main-content {
        margin-left: 0;
        padding: 20px;
    }
}