* { 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: #f8f9fa;
            max-width: 120rem;
            margin: 0 auto;
            padding: 0 1rem;
        }
        h1, h2, h3, h4 { color: #1a365d; margin-bottom: 1rem; font-weight: 700; }
        h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); margin-top: 2rem; border-bottom: 3px solid #e53e3e; padding-bottom: 0.5rem; }
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-top: 2.5rem; color: #2d3748; }
        h3 { font-size: 1.5rem; margin-top: 2rem; color: #4a5568; }
        h4 { font-size: 1.2rem; margin-top: 1.5rem; color: #718096; }
        p { margin-bottom: 1.2rem; font-size: 1.1rem; }
        a { color: #3182ce; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #e53e3e; text-decoration: underline; }
        strong { color: #2d3748; }
        .container { width: 100%; margin: 0 auto; }
        .site-header {
            background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: #fff;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .my-logo span { color: #e53e3e; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e2e8f0;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover { color: #fff; }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #e53e3e;
            transition: width 0.3s;
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.95rem;
            color: #718096;
        }
        .breadcrumb a { color: #4a5568; }
        .content-main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-main { grid-template-columns: 1fr; }
        }
        .article-content { background: white; padding: 2.5rem; border-radius: 12px; box-shadow: 0 6px 20px rgba(0,0,0,0.07); }
        .sidebar { background: #edf2f7; padding: 1.5rem; border-radius: 12px; height: fit-content; }
        .interactive-module {
            background: #fff;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2.5rem 0;
            border-left: 5px solid #3182ce;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }
        .interactive-module h3 { margin-top: 0; }
        form { display: flex; flex-direction: column; gap: 1rem; }
        input, textarea, select {
            padding: 0.8rem 1rem;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
        }
        button {
            background: #3182ce;
            color: white;
            border: none;
            padding: 0.9rem 1.5rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        button:hover { background: #2c5282; }
        .rating-stars { display: flex; gap: 0.5rem; font-size: 1.5rem; color: #ffd700; margin-bottom: 1rem; }
        .highlight-box {
            background: linear-gradient(to right, #feebc8, #fed7d7);
            padding: 1.5rem;
            border-radius: 10px;
            margin: 1.5rem 0;
            border-left: 5px solid #dd6b20;
        }
        .data-point {
            display: inline-block;
            background: #1a365d;
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 50px;
            font-weight: bold;
            margin: 0.5rem;
        }
        img.responsive-img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 1.5rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            display: block;
        }
        .site-footer {
            background: #2d3748;
            color: #e2e8f0;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
            border-top: 5px solid #e53e3e;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section { flex: 1; min-width: 250px; }
        .footer-section h3 { color: #fff; margin-bottom: 1.5rem; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #cbd5e0; }
        friend-link {
            display: inline-block;
            background: #4a5568;
            color: #fff;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            margin: 0.3rem;
            font-size: 0.9rem;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #4a5568;
            color: #a0aec0;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease-out;
            }
            .main-nav.active {
                max-height: 500px;
                margin-top: 1rem;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li { width: 100%; }
            .main-nav a {
                display: block;
                padding: 0.8rem 0;
                border-bottom: 1px solid #4a5568;
            }
            .header-container { flex-wrap: wrap; }
            .article-content { padding: 1.5rem; }
        }