:root {
            --primary: #4a6fa5;
            --primary-dark: #2e4a7a;
            --secondary: #e67e22;
            --accent: #16a085;
            --light: #f8f9fa;
            --dark: #2c3e50;
            --grey: #7f8c8d;
            --border: #dfe6e9;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        * {
            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: #333;
            background-color: #fff;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--dark);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo span {
            color: var(--secondary);
        }
        .my-logo:hover {
            color: var(--light);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 5px 0;
            position: relative;
        }
        .main-nav a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary);
            transition: var(--transition);
        }
        .main-nav a:hover:after {
            width: 100%;
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 12px 0;
            font-size: 0.9rem;
            border-bottom: 1px solid var(--border);
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child):after {
            content: '>';
            margin: 0 10px;
            color: var(--grey);
        }
        .page-title {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
        }
        .page-title h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            line-height: 1.2;
        }
        .page-title p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.9;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 30px 0;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
        }
        article {
            padding-right: 20px;
            border-right: 1px solid var(--border);
        }
        @media (max-width: 992px) {
            article {
                padding-right: 0;
                border-right: none;
            }
        }
        .sidebar {
            position: sticky;
            top: 120px;
            align-self: start;
        }
        .sidebar-widget {
            background: var(--light);
            border-radius: 8px;
            padding: 25px;
            margin-bottom: 30px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            color: var(--dark);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }
        h1, h2, h3, h4 {
            color: var(--dark);
            margin-top: 2rem;
            margin-bottom: 1rem;
            line-height: 1.3;
            font-weight: 700;
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary-dark);
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border);
        }
        h3 {
            font-size: 1.7rem;
            color: var(--primary);
        }
        h4 {
            font-size: 1.3rem;
            color: var(--accent);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--dark);
            background: #f1f8ff;
            padding: 20px;
            border-left: 4px solid var(--primary);
            border-radius: 0 5px 5px 0;
            margin: 2rem 0;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 20px;
            border-left: 5px solid var(--secondary);
            margin: 25px 0;
            border-radius: 0 5px 5px 0;
        }
        .highlight h4 {
            margin-top: 0;
        }
        .definition {
            background: #f0f7ff;
            border: 1px dashed var(--primary);
            padding: 20px;
            border-radius: 8px;
            margin: 25px 0;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.7rem;
        }
        .article-image {
            margin: 35px auto;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            max-width: 800px;
        }
        .article-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 10px;
            background-color: var(--light);
            color: var(--grey);
            font-size: 0.9rem;
        }
        .search-box, .comment-form, .rating-form {
            background: var(--light);
            padding: 25px;
            border-radius: 10px;
            margin: 40px 0;
            box-shadow: var(--shadow);
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }
        input, textarea, select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border);
            border-radius: 5px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
        }
        button, .btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 5px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-block;
        }
        button:hover, .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
        }
        .btn-secondary {
            background-color: var(--secondary);
        }
        .btn-secondary:hover {
            background-color: #d35400;
        }
        .stars {
            display: flex;
            gap: 5px;
            margin: 15px 0;
            direction: rtl;
        }
        .stars input {
            display: none;
        }
        .stars label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
            margin: 0;
        }
        .stars label:hover,
        .stars label:hover ~ label,
        .stars input:checked ~ label {
            color: #ffc107;
        }
        .comments-list {
            margin-top: 40px;
        }
        .comment {
            background: #f9f9f9;
            padding: 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            border-left: 4px solid var(--border);
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            font-size: 0.9rem;
            color: var(--grey);
        }
        .comment-author {
            font-weight: bold;
            color: var(--dark);
        }
        .site-footer {
            background-color: var(--dark);
            color: white;
            padding: 60px 0 30px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-widget h3 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
            margin-left: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #bdc3c7;
        }
        .footer-links a:hover {
            color: var(--secondary);
            padding-left: 5px;
        }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 8px 15px;
            border-radius: 4px;
            margin: 5px;
            font-size: 0.9rem;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #95a5a6;
            font-size: 0.9rem;
        }
        .text-center {
            text-align: center;
        }
        .mb-3 { margin-bottom: 1rem; }
        .mb-4 { margin-bottom: 1.5rem; }
        .mb-5 { margin-bottom: 3rem; }
        .mt-5 { margin-top: 3rem; }
        .d-flex { display: flex; }
        .align-center { align-items: center; }
        .justify-between { justify-content: space-between; }
        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                background-color: var(--dark);
                padding: 20px;
                transition: var(--transition);
                box-shadow: 0 10px 10px rgba(0,0,0,0.1);
            }
            .main-nav.active {
                left: 0;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 15px;
            }
            .page-title h1 {
                font-size: 2.2rem;
            }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .header-top {
                padding: 12px 0;
            }
            .content-wrapper {
                gap: 30px;
                padding: 20px 0;
            }
        }
        @media print {
            .site-header, .sidebar, .search-box, .comment-form, .rating-form, .site-footer {
                display: none;
            }
            article {
                border: none;
                padding: 0;
            }
            body {
                font-size: 12pt;
                line-height: 1.4;
            }
        }