:root {
            --primary-dark: #0a2a4a;
            --primary-accent: #00a8ff;
            --secondary-accent: #ff6b6b;
            --light-bg: #f8f9fa;
            --dark-text: #2c3e50;
            --light-text: #ecf0f1;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--dark-text);
            background-color: var(--light-bg);
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }
        a {
            color: var(--primary-accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-accent);
            text-decoration: underline;
        }
        header {
            background: linear-gradient(135deg, var(--primary-dark), #1a4a7a);
            color: var(--light-text);
            padding: 1.5rem 0;
            border-bottom-left-radius: var(--border-radius);
            border-bottom-right-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(to right, #ffd700, var(--primary-accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            padding: 0.5rem;
            border-radius: var(--border-radius);
        }
        .my-logo:hover {
            transform: scale(1.05);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            padding: 10px;
        }
        .hamburger span {
            height: 3px;
            width: 25px;
            background: var(--light-text);
            margin: 4px 0;
            border-radius: 2px;
            transition: var(--transition);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
            flex-wrap: wrap;
        }
        nav a {
            color: var(--light-text);
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
        }
        nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            text-decoration: none;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: #bdc3c7;
            margin-top: 1rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        .breadcrumb a {
            color: #bdc3c7;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin-bottom: 3rem;
        }
        article {
            background-color: white;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-dark);
            margin-bottom: 1.5rem;
            border-bottom: 4px solid var(--primary-accent);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-dark);
            margin: 2.5rem 0 1.2rem;
            padding-left: 0.5rem;
            border-left: 5px solid var(--secondary-accent);
        }
        h3 {
            font-size: 1.6rem;
            color: #1a4a7a;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #2c3e50;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight {
            background-color: #fffacd;
            padding: 1.5rem;
            border-left: 5px solid #ffd700;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: 2rem auto;
            display: block;
        }
        .interactive-section {
            background-color: #e8f4fc;
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            border: 2px dashed var(--primary-accent);
        }
        .interactive-section h3 {
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #bdc3c7;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-family: inherit;
        }
        button {
            background: linear-gradient(to right, var(--primary-accent), #1a4a7a);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            transition: var(--transition);
            align-self: flex-start;
        }
        button:hover {
            background: linear-gradient(to right, #1a4a7a, var(--primary-accent));
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0, 168, 255, 0.3);
        }
        .last-updated {
            font-style: italic;
            color: #7f8c8d;
            text-align: right;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid #ecf0f1;
        }
        aside {
            background-color: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            height: fit-content;
            position: sticky;
            top: 140px;
        }
        .related-links ul {
            list-style: none;
            padding-left: 0;
        }
        .related-links li {
            margin-bottom: 1rem;
            padding: 0.8rem;
            border-radius: var(--border-radius);
            background-color: #f8f9fa;
            transition: var(--transition);
        }
        .related-links li:hover {
            background-color: #e8f4fc;
            transform: translateX(5px);
        }
        footer {
            background-color: var(--primary-dark);
            color: var(--light-text);
            padding: 3rem 0;
            border-top-left-radius: var(--border-radius);
            border-top-right-radius: var(--border-radius);
            text-align: center;
            margin-top: 4rem;
        }
        friend-link {
            display: block;
            margin-bottom: 2rem;
            font-size: 1.2rem;
        }
        friend-link a {
            color: #ffd700;
            font-weight: bold;
            padding: 0.8rem 1.5rem;
            border: 2px solid #ffd700;
            border-radius: var(--border-radius);
        }
        friend-link a:hover {
            background-color: #ffd700;
            color: var(--primary-dark);
            text-decoration: none;
        }
        .copyright {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            font-size: 0.9rem;
            color: #bdc3c7;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
            }
            aside {
                position: static;
                margin-top: 2rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .hamburger {
                display: flex;
                position: absolute;
                right: 20px;
                top: 30px;
            }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                margin-top: 1rem;
            }
            nav ul.active {
                display: flex;
            }
            h1 {
                font-size: 2.2rem;
            }
            article {
                padding: 1.5rem;
            }
        }