:root {
            --primary-blue: #2c3e50;
            --accent-gold: #f1c40f;
            --accent-red: #e74c3c;
            --light-bg: #ecf0f1;
            --dark-text: #2c3e50;
            --light-text: #f8f9fa;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --border-radius: 8px;
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark-text);
            background-color: var(--light-bg);
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-red);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--primary-blue);
            color: var(--light-text);
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-gold);
            text-transform: uppercase;
            letter-spacing: 1px;
            font-family: 'Trebuchet MS', sans-serif;
        }
        .my-logo:hover {
            transform: scale(1.03);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .nav-links a {
            color: var(--light-text);
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: var(--border-radius);
        }
        .nav-links a:hover,
        .nav-links a.active {
            background-color: var(--accent-gold);
            color: var(--primary-blue);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--light-text);
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #fff;
            border-bottom: 1px solid #ddd;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: #999;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .content-area {
            background: #fff;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: #fff;
            padding: 1.8rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        h1, h2, h3, h4 {
            color: var(--primary-blue);
            margin-top: 1.8em;
            margin-bottom: 0.8em;
            line-height: 1.3;
            font-weight: 700;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid var(--accent-gold);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--accent-red);
        }
        h3 {
            font-size: 1.8rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #555;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 600;
            color: #444;
            background-color: #f9f9f9;
            padding: 1.2rem;
            border-left: 4px solid var(--accent-gold);
            border-radius: var(--border-radius);
            margin-bottom: 2rem;
        }
        em, strong {
            color: var(--primary-blue);
        }
        .highlight {
            background-color: #fffacd;
            padding: 0.2rem 0.4rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .stats-box {
            background: linear-gradient(135deg, var(--primary-blue), #34495e);
            color: white;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .stats-box h3 {
            color: var(--accent-gold);
            margin-top: 0;
        }
        blockquote {
            font-style: italic;
            border-left: 5px solid var(--accent-red);
            padding-left: 1.5rem;
            margin: 2rem 0;
            color: #555;
            background-color: #f9f9f9;
            padding: 1.5rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2rem auto;
            display: block;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-image:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .float-right {
            float: right;
            margin: 1rem 0 1rem 2rem;
            max-width: 400px;
        }
        @media (max-width: 768px) {
            .float-right {
                float: none;
                margin: 1rem auto;
                display: block;
            }
        }
        .user-interaction {
            background-color: #f8f9fa;
            padding: 2rem;
            border-radius: var(--border-radius);
            border: 1px solid #dee2e6;
            margin: 3rem 0;
        }
        .user-interaction h3 {
            margin-top: 0;
            color: var(--primary-blue);
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        label {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #555;
        }
        input, textarea, select {
            padding: 0.8rem 1rem;
            border: 1px solid #ccc;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.2);
        }
        button, .btn {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 700;
            font-size: 1rem;
            transition: var(--transition);
            align-self: flex-start;
        }
        button:hover, .btn:hover {
            background-color: var(--accent-red);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            margin: 0.5rem 0;
        }
        .stars input {
            display: none;
        }
        .stars label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .stars label:hover,
        .stars label:hover ~ label,
        .stars input:checked ~ label {
            color: var(--accent-gold);
        }
        footer {
            background-color: var(--primary-blue);
            color: var(--light-text);
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h4 {
            color: var(--accent-gold);
            margin-top: 0;
            border-bottom: 2px solid var(--accent-gold);
            padding-bottom: 0.5rem;
            display: inline-block;
        }
        .footer-links {
            list-style: none;
            margin-top: 1rem;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #ddd;
        }
        .footer-links a:hover {
            color: var(--accent-gold);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.1);
            padding: 0.8rem;
            margin: 0.5rem 0;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: rgba(255,255,255,0.2);
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: var(--primary-blue);
                padding: 1rem 0;
                margin-top: 1rem;
                border-radius: var(--border-radius);
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                text-align: center;
                margin: 0.5rem 0;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .content-area, .sidebar {
                padding: 1.5rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .mb-3 {
            margin-bottom: 3rem;
        }
        .last-updated {
            font-style: italic;
            color: #777;
            font-size: 0.95rem;
            margin-bottom: 2rem;
            display: block;
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }