* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            min-height: 100vh;
        }
        a { color: #2c8cff; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #1a75ff; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .section-spacing { margin: 3rem 0; }
        .highlight-box {
            background: linear-gradient(90deg, #e3f2fd, #f3e5f5);
            border-left: 5px solid #2c8cff;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .site-header {
            background: #1a237e;
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 900;
            background: linear-gradient(90deg, #ffeb3b, #4caf50);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-decoration: none;
        }
        .my-logo:hover { text-decoration: none; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #fff;
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover { text-decoration: none; color: #ffeb3b; }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #ffeb3b;
            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;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: #283593;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 10px 15px rgba(0,0,0,0.2);
        }
        .mobile-nav.active { display: flex; }
        .mobile-nav a {
            color: white;
            padding: 0.8rem;
            border-bottom: 1px solid #3949ab;
        }
        .breadcrumb {
            background: #e8eaf6;
            padding: 0.8rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 10px;
            color: #666;
        }
        main { background: white; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); padding: 3rem; margin: 2rem auto; }
        h1 { font-size: 2.8rem; color: #1a237e; margin-bottom: 1.5rem; line-height: 1.2; }
        h2 { font-size: 2rem; color: #283593; margin: 2.5rem 0 1rem; border-bottom: 2px solid #e8eaf6; padding-bottom: 0.5rem; }
        h3 { font-size: 1.6rem; color: #3949ab; margin: 2rem 0 1rem; }
        h4 { font-size: 1.3rem; color: #5c6bc0; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        article > p:first-of-type { font-size: 1.2rem; color: #555; }
        .interactive-module {
            background: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
        }
        .interactive-module h3 { border-bottom: none; }
        .form-group { margin-bottom: 1.5rem; }
        .form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus { outline: none; border-color: #2c8cff; box-shadow: 0 0 0 3px rgba(44, 140, 255, 0.2); }
        .btn {
            background: #2c8cff;
            color: white;
            border: none;
            padding: 0.8rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
        }
        .btn:hover { background: #1a75ff; transform: translateY(-2px); }
        .stars { color: #ffc107; font-size: 1.5rem; margin: 1rem 0; }
        .stars i { cursor: pointer; margin: 0 2px; transition: transform 0.2s; }
        .stars i:hover { transform: scale(1.2); }
        .article-img {
            float: right;
            margin: 0 0 1.5rem 2rem;
            width: min(400px, 100%);
            border-radius: 10px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            shape-outside: margin-box;
        }
        .img-caption { font-size: 0.9rem; color: #666; text-align: center; margin-top: 0.5rem; font-style: italic; }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
            list-style: none;
        }
        .related-links li { background: #f1f8ff; padding: 1rem; border-radius: 8px; transition: transform 0.3s; }
        .related-links li:hover { transform: translateY(-5px); background: #e3f2fd; }
        .related-links a { font-weight: 500; }
        .site-footer {
            background: #1a237e;
            color: #e8eaf6;
            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-section h4 { color: #ffeb3b; }
        friend-link {
            display: block;
            background: #283593;
            padding: 1rem;
            margin: 0.5rem 0;
            border-radius: 6px;
            transition: background 0.3s;
        }
        friend-link:hover { background: #3949ab; }
        friend-link a { color: #fff; font-weight: 500; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #b0b3c1;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .article-img { float: none; margin: 1.5rem auto; width: 80%; }
        }
        @media (max-width: 768px) {
            .header-inner { flex-wrap: wrap; }
            .main-nav { display: none; }
            .hamburger { display: block; }
            .mobile-nav { display: none; }
            main { padding: 1.5rem; }
            .related-links { grid-template-columns: 1fr; }
            .footer-content { grid-template-columns: 1fr; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            .interactive-module { padding: 1.5rem; }
        }