:root {
            --primary: #0a2463;
            --secondary: #ff6b6b;
            --accent: #3a86ff;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --border-radius: 12px;
            --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);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary) 0%, #1e3c8c 100%);
            color: white;
            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 a {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .my-logo i {
            color: var(--secondary);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e0e0e0;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0.3rem;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: white;
            border-bottom-color: var(--secondary);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #f1f5fd;
            padding: 1rem 0;
            font-size: 0.95rem;
            margin-bottom: 2rem;
        }
        .breadcrumb .container {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb span {
            color: var(--dark);
        }
        .breadcrumb i {
            margin: 0 0.5rem;
            color: #aaa;
        }
        .search-section {
            background: linear-gradient(to right, #f8f9fa, #e9ecef);
            padding: 3rem 0;
            text-align: center;
            margin-bottom: 3rem;
        }
        .search-box {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            box-shadow: var(--shadow);
            border-radius: 50px;
            overflow: hidden;
        }
        .search-box input {
            flex: 1;
            padding: 1.2rem 1.5rem;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        .search-box button {
            background: var(--accent);
            color: white;
            border: none;
            padding: 0 2rem;
            cursor: pointer;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: var(--primary);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0 4rem;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            color: var(--primary);
            border-left: 4px solid var(--secondary);
            padding-left: 10px;
            margin-bottom: 1.5rem;
        }
        .sidebar ul {
            list-style: none;
            margin-bottom: 2rem;
        }
        .sidebar li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed #ddd;
        }
        .sidebar a {
            color: var(--dark);
            display: block;
        }
        .sidebar a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary);
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }
        h3 {
            font-size: 1.8rem;
            color: #1a3a8f;
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--dark);
            margin: 2rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            color: var(--gray);
            font-weight: 500;
            margin-bottom: 2.5rem;
            padding-left: 1rem;
            border-left: 4px solid var(--accent);
        }
        .highlight {
            background-color: #fffacd;
            padding: 0.2rem 0.4rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .note {
            background-color: #e7f3ff;
            border-left: 4px solid var(--accent);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .note i {
            color: var(--accent);
            margin-right: 10px;
        }
        .article-image {
            margin: 2.5rem auto;
            text-align: center;
        }
        .article-image img {
            border-radius: var(--border-radius);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            max-width: 800px;
            width: 100%;
        }
        .image-caption {
            font-style: italic;
            color: var(--gray);
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        ul.feature-list,
        ol.strategy-list {
            padding-left: 2rem;
            margin-bottom: 2rem;
        }
        ul.feature-list li,
        ol.strategy-list li {
            margin-bottom: 0.8rem;
            padding-left: 0.5rem;
        }
        .button {
            display: inline-block;
            background: var(--secondary);
            color: white;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .button:hover {
            background: var(--primary);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(255, 107, 107, 0.3);
            color: white;
        }
        .interactive-section {
            background: #f8f9fa;
            padding: 3rem;
            border-radius: var(--border-radius);
            margin: 4rem 0;
        }
        .interactive-section h2 {
            text-align: center;
            border: none;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 1rem;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.2);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0 2rem;
            justify-content: center;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating label:hover,
        .rating label:hover ~ label,
        .rating input:checked ~ label {
            color: #ffc107;
        }
        .form-row {
            display: flex;
            gap: 1.5rem;
        }
        @media (max-width: 768px) {
            .form-row {
                flex-direction: column;
                gap: 0;
            }
        }
        .form-row .form-group {
            flex: 1;
        }
        .site-footer {
            background: var(--dark);
            color: #adb5bd;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 1rem;
        }
        .footer-heading {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--secondary);
            display: inline-block;
        }
        footer ul {
            list-style: none;
        }
        footer li {
            margin-bottom: 0.8rem;
        }
        footer a {
            color: #adb5bd;
        }
        footer a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: 8px;
            margin-top: 1rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #495057;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                position: fixed;
                top: 80px;
                right: -100%;
                flex-direction: column;
                background: var(--primary);
                width: 280px;
                height: calc(100vh - 80px);
                padding: 2rem;
                transition: right 0.4s ease;
                box-shadow: -5px 0 15px rgba(0,0,0,0.1);
                z-index: 999;
            }
            .main-nav.active ul {
                right: 0;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .article-content {
                padding: 1.5rem;
            }
            .interactive-section {
                padding: 2rem 1.5rem;
            }
        }
        @media print {
            .site-header,
            .search-section,
            .sidebar,
            .interactive-section,
            .site-footer {
                display: none;
            }
            .main-content {
                grid-template-columns: 1fr;
            }
            body {
                font-size: 12pt;
                line-height: 1.5;
            }
        }