* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #1a365d;
            --secondary: #e53e3e;
            --accent: #38a169;
            --light: #f7fafc;
            --dark: #2d3748;
            --gray: #718096;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f8f9fa;
            color: var(--dark);
            line-height: 1.6;
            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;
        }
        .section {
            padding: 60px 0;
        }
        .site-header {
            background-color: var(--primary);
            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;
        }
        .logo a {
            color: white;
            font-size: 1.8rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .main-nav {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            color: #cbd5e0;
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: white;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 1rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            margin: 0 5px;
        }
        .hero {
            background: linear-gradient(135deg, var(--primary) 0%, #2c5282 100%);
            color: white;
            padding: 4rem 0;
            text-align: center;
            border-radius: 0 0 20px 20px;
            margin-bottom: 3rem;
        }
        .hero h1 {
            font-size: 3rem;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            opacity: 0.9;
        }
        .cta-button {
            display: inline-block;
            background-color: var(--secondary);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.1rem;
            box-shadow: 0 4px 15px rgba(229, 62, 62, 0.4);
        }
        .cta-button:hover {
            background-color: #c53030;
            transform: translateY(-3px);
            color: white;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .main-article {
            background: white;
            padding: 2.5rem;
            border-radius: 15px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        h1, h2, h3, h4 {
            color: var(--primary);
            margin-top: 1.5em;
            margin-bottom: 0.8em;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 10px;
        }
        h2 {
            font-size: 2rem;
            padding-bottom: 8px;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--dark);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            font-weight: 500;
            color: var(--dark);
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fffaf0;
            border-left: 4px solid var(--secondary);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .term {
            font-weight: bold;
            color: var(--primary);
        }
        .emoji {
            margin-right: 5px;
            font-size: 1.1em;
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .article-img {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .internal-link {
            color: var(--accent);
            font-weight: 500;
        }
        .internal-link:hover {
            text-decoration: underline;
        }
        .widget {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.3rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
            color: var(--primary);
        }
        .search-box {
            display: flex;
        }
        .search-box input {
            flex: 1;
            padding: 0.8rem;
            border: 1px solid #cbd5e0;
            border-radius: 5px 0 0 5px;
            font-size: 1rem;
        }
        .search-box button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0 1.2rem;
            border-radius: 0 5px 5px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background-color: #2c5282;
        }
        .rating-container {
            text-align: center;
        }
        .stars {
            margin: 1rem 0;
            font-size: 1.8rem;
            color: #e2e8f0;
        }
        .stars i {
            cursor: pointer;
            padding: 0 2px;
            transition: var(--transition);
        }
        .stars i:hover,
        .stars i.active {
            color: #f6ad55;
        }
        .rating-form input,
        .rating-form textarea {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #cbd5e0;
            border-radius: 5px;
        }
        .rating-form button {
            width: 100%;
            padding: 0.8rem;
            background-color: var(--accent);
            color: white;
            border: none;
            border-radius: 5px;
            font-weight: 600;
            cursor: pointer;
        }
        .rating-form button:hover {
            background-color: #2f855a;
        }
        .comment {
            border-bottom: 1px solid #e2e8f0;
            padding: 1rem 0;
        }
        .comment:last-child {
            border-bottom: none;
        }
        .comment-author {
            font-weight: bold;
            color: var(--primary);
        }
        .comment-date {
            font-size: 0.85rem;
            color: var(--gray);
        }
        .comment-form textarea {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #cbd5e0;
            border-radius: 5px;
            margin-bottom: 1rem;
            resize: vertical;
        }
        .related-links {
            list-style: none;
            margin-left: 0;
        }
        .related-links li {
            margin-bottom: 0.8rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .related-links li:before {
            content: '→';
            position: absolute;
            left: 0;
            color: var(--accent);
        }
        .site-footer {
            background-color: var(--dark);
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            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-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--secondary);
        }
        friend-link {
            display: block;
            margin-bottom: 1rem;
        }
        friend-link a {
            color: #cbd5e0;
        }
        friend-link a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--primary);
                flex-direction: column;
                align-items: center;
                padding: 2rem 0;
                gap: 1.5rem;
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: clip-path 0.4s ease;
                box-shadow: 0 10px 15px -3px rgba(0,0,0,0.2);
            }
            .main-nav.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .main-article {
                padding: 1.5rem;
            }
            .section {
                padding: 40px 0;
            }
        }