* {
    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: #333;
    background-color: #f5f5f5;
}

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

.sidebar {
    width: 280px;
    background-color: #2c3e50;
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar-header {
    padding: 30px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
    font-size: 24px;
    font-weight: 600;
}

.sidebar-nav ul {
    list-style: none;
    padding: 10px 0;
}

.sidebar-nav li {
    margin: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-item.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    border-left-color: #3498db;
}

.nav-item .icon {
    font-size: 20px;
    margin-right: 12px;
    width: 24px;
    text-align: center;
}

.nav-item .text {
    font-size: 15px;
}

.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 40px 60px;
    background-color: white;
}

#content-area {
    max-width: 900px;
}

.content-section {
    animation: fadeIn 0.3s ease-in;
}

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

h1 {
    font-size: 36px;
    color: #2c3e50;
    margin-bottom: 20px;
    font-weight: 700;
}

h2 {
    font-size: 28px;
    color: #34495e;
    margin-top: 40px;
    margin-bottom: 20px;
    font-weight: 600;
}

h3 {
    font-size: 22px;
    color: #34495e;
    margin-top: 30px;
    margin-bottom: 15px;
    font-weight: 600;
}

p {
    margin-bottom: 16px;
    color: #555;
    font-size: 16px;
}

ul, ol {
    margin-bottom: 20px;
    padding-left: 30px;
}

li {
    margin-bottom: 10px;
    color: #555;
    font-size: 16px;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

hr {
    border: none;
    border-top: 1px solid #e0e0e0;
    margin: 30px 0;
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
    }

    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 24px;
    }

    h3 {
        font-size: 20px;
    }
}