:root {
            --primary: #1a237e;
            --secondary: #e8eaf6;
            --accent: #ff9800;
            --text: #212121;
            --light-text: #757575;
            --background: #ffffff;
            --card-bg: #f5f5f5;
            --border: #e0e0e0;
            --shadow: rgba(0, 0, 0, 0.08);
            --hover-shadow: rgba(26, 35, 126, 0.15);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--background);
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--accent);
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
        }
        header {
            background: linear-gradient(135deg, var(--primary) 0%, #283593 100%);
            color: white;
            padding: 1.2rem 0;
            border-radius: 0 0 12px 12px;
            margin-bottom: 2rem;
            box-shadow: 0 4px 12px var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
        }
        .logo a i {
            margin-right: 10px;
            color: var(--accent);
        }
        .logo a:hover {
            color: var(--secondary);
        }
        .desktop-nav ul {
            display: flex;
            gap: 1.8rem;
        }
        .desktop-nav a {
            color: var(--secondary);
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 6px;
        }
        .desktop-nav a:hover,
        .desktop-nav a.active {
            background-color: rgba(255, 255, 255, 0.15);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            width: 100%;
            background-color: var(--primary);
            margin-top: 1rem;
            border-radius: 8px;
            overflow: hidden;
        }
        .mobile-nav.active {
            display: block;
        }
        .mobile-nav ul {
            padding: 1rem 0;
        }
        .mobile-nav li {
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .mobile-nav a {
            display: block;
            padding: 1rem 1.5rem;
            color: white;
        }
        .mobile-nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background-color: var(--secondary);
            padding: 0.8rem 1.2rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--light-text);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb i {
            margin: 0 8px;
            color: var(--light-text);
            font-size: 0.8rem;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin-bottom: 3rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background-color: var(--background);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 4px 15px var(--shadow);
        }
        .article-meta {
            color: var(--light-text);
            margin-bottom: 1.5rem;
            font-size: 0.95rem;
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .article-meta span i {
            margin-right: 5px;
        }
        h1 {
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            color: var(--primary);
            line-height: 1.3;
        }
        h2 {
            font-size: 1.8rem;
            margin: 2.5rem 0 1.2rem;
            color: var(--primary);
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--secondary);
        }
        h3 {
            font-size: 1.4rem;
            margin: 2rem 0 1rem;
            color: #3949ab;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.15rem;
            background-color: var(--secondary);
            padding: 1.5rem;
            border-left: 5px solid var(--accent);
            border-radius: 0 8px 8px 0;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff8e1;
            padding: 1.2rem;
            border-radius: 8px;
            border-left: 4px solid var(--accent);
            margin: 1.8rem 0;
        }
        .highlight p:last-child {
            margin-bottom: 0;
        }
        .tip-box {
            background-color: #e8f5e9;
            border-left: 4px solid #4caf50;
            padding: 1.2rem;
            border-radius: 8px;
            margin: 1.8rem 0;
        }
        .term {
            font-weight: bold;
            color: var(--primary);
        }
        .image-container {
            margin: 2.5rem auto;
            text-align: center;
            max-width: 800px;
        }
        .image-container img {
            border-radius: 10px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        .image-container img:hover {
            transform: scale(1.01);
        }
        .image-caption {
            font-style: italic;
            color: var(--light-text);
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 1.8rem;
        }
        .widget {
            background-color: var(--background);
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 4px 12px var(--shadow);
        }
        .widget h3 {
            margin-top: 0;
            margin-bottom: 1.2rem;
            font-size: 1.3rem;
            color: var(--primary);
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            flex: 1;
            padding: 0.9rem 1rem;
            border: 2px solid var(--border);
            border-right: none;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-form input:focus {
            border-color: var(--primary);
        }
        .search-form button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .search-form button:hover {
            background-color: #283593;
        }
        .rating-form label {
            display: block;
            margin-bottom: 0.8rem;
            font-weight: 600;
        }
        .stars {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            margin-bottom: 1rem;
        }
        .stars input {
            display: none;
        }
        .stars label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            margin: 0 2px;
            transition: color 0.2s;
        }
        .stars input:checked ~ label,
        .stars label:hover,
        .stars label:hover ~ label {
            color: var(--accent);
        }
        .rating-form button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: background-color 0.3s;
            width: 100%;
        }
        .rating-form button:hover {
            background-color: #283593;
        }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            margin-bottom: 1rem;
            resize: vertical;
            min-height: 120px;
            transition: border-color 0.3s;
        }
        .comment-form textarea:focus {
            outline: none;
            border-color: var(--primary);
        }
        .comment-form button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: background-color 0.3s;
        }
        .comment-form button:hover {
            background-color: #283593;
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 1rem;
            margin: 2.5rem 0;
        }
        @media (max-width: 768px) {
            .footer-links {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        .web-link {
            background-color: var(--secondary);
            padding: 1rem;
            border-radius: 8px;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px var(--hover-shadow);
        }
        .web-link a {
            color: var(--text);
            font-weight: 500;
            display: block;
        }
        .web-link a:hover {
            color: var(--primary);
        }
        footer {
            background-color: var(--primary);
            color: white;
            padding: 2.5rem 1.5rem;
            border-radius: 12px 12px 0 0;
            margin-top: 3rem;
        }
        .footer-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        .copyright {
            color: var(--secondary);
            font-size: 0.95rem;
        }
        .footer-links-small a {
            color: var(--secondary);
            margin-left: 1.2rem;
        }
        .footer-links-small a:hover {
            color: white;
        }
        @media (max-width: 768px) {
            html {
                font-size: 15px;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .header-container {
                padding: 0 1rem;
            }
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-content {
                padding: 1.5rem;
            }
            .footer-container {
                flex-direction: column;
                text-align: center;
            }
            .footer-links-small a {
                margin: 0 0.6rem;
            }
        }
        .btn {
            display: inline-block;
            background-color: var(--primary);
            color: white;
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            background-color: var(--accent);
            color: var(--text);
            box-shadow: 0 5px 15px rgba(255, 152, 0, 0.3);
        }
        .tag {
            display: inline-block;
            background-color: var(--secondary);
            color: var(--primary);
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        .content-section {
            margin-bottom: 3rem;
        }
        .quote {
            font-style: italic;
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            margin: 2rem 0;
            color: var(--light-text);
        }
        .author {
            text-align: right;
            font-weight: bold;
            color: var(--primary);
        }
        .stats-box {
            background: linear-gradient(135deg, var(--primary) 0%, #283593 100%);
            color: white;
            padding: 1.8rem;
            border-radius: 12px;
            text-align: center;
            margin: 2rem 0;
        }
        .stats-box .number {
            font-size: 2.5rem;
            font-weight: 800;
            display: block;
        }
        .stats-box .label {
            font-size: 1rem;
            opacity: 0.9;
        }