:root {
            --primary-color: #1a1a2e;
            --secondary-color: #16213e;
            --accent-color: #0f3460;
            --text-color: #333;
            --light-text: #f5f5f5;
            --border-color: #ddd;
            --highlight-bg: #f0f5ff;
            --warning-bg: #fff3cd;
            --warning-border: #ffeaa7;
            --success-bg: #d1ecf1;
            --success-border: #bee5eb;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f9f9f9;
            color: var(--text-color);
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: var(--light-text);
            padding: 2rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .logo-icon {
            font-size: 2.5rem;
            background: var(--accent-color);
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        
        .logo-text h1 {
            font-size: 1.8rem;
            margin-bottom: 5px;
        }
        
        .logo-text p {
            opacity: 0.8;
            font-size: 0.9rem;
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        
        nav a {
            color: var(--light-text);
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s;
        }
        
        nav a:hover {
            opacity: 0.8;
        }
        
        .content {
            background-color: white;
            padding: 3rem 2rem;
            margin: 2rem auto;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        h1, h2, h3 {
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        h1 {
            font-size: 2.2rem;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 10px;
            margin-bottom: 2rem;
        }
        
        h2 {
            font-size: 1.6rem;
            margin-top: 2rem;
            padding-left: 15px;
            border-left: 4px solid var(--accent-color);
        }
        
        h3 {
            font-size: 1.3rem;
            margin-top: 1.5rem;
        }
        
        p {
            margin-bottom: 1.2rem;
        }
        
        ul, ol {
            margin-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        
        li {
            margin-bottom: 0.5rem;
        }