* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            background-image: linear-gradient(to bottom right, #f0f7ff 0%, #e6f3ff 100%);
            max-width: 100%;
            overflow-x: hidden;
        }
        a { color: #1a73e8; text-decoration: none; transition: all 0.3s ease; }
        a:hover { color: #0d47a1; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5rem; margin-bottom: 1.5rem; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.4rem; border-radius: 3px; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .last-updated {
            font-size: 0.9rem;
            color: #666;
            background: #e9ecef;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            display: inline-block;
            margin-bottom: 2rem;
        }
        .site-header {
            background: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Georgia', serif;
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            letter-spacing: 1px;
        }
        .my-logo span { color: #4fc3f7; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
        }
        .main-nav a:hover {
            background-color: rgba(255,255,255,0.15);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav ul {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #2c3e50;
                padding: 1rem;
                display: none;
                box-shadow: 0 5px 10px rgba(0,0,0,0.2);
            }
            .main-nav.active ul {
                display: flex;
            }
            .main-nav ul li {
                width: 100%;
            }
            .main-nav a {
                display: block;
                padding: 1rem;
                border-bottom: 1px solid #405675;
            }
        }
        .breadcrumb {
            background: #e9ecef;
            padding: 1rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding-left: 0;
            margin-bottom: 0;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 10px;
            color: #6c757d;
        }
        .breadcrumb a { color: #495057; }
        main { padding: 2rem 0 4rem; }
        article {
            background: white;
            padding: 3rem;
            border-radius: 12px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.08);
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #4fc3f7;
            padding-bottom: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: #34495e;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }
        h3 {
            font-size: 1.5rem;
            color: #2c3e50;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #4a5568;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .intro {
            font-size: 1.25rem;
            color: #555;
            background: #f1f8ff;
            padding: 1.5rem;
            border-left: 5px solid #1a73e8;
            margin-bottom: 2.5rem;
            border-radius: 0 8px 8px 0;
        }
        .featured-img {
            width: 80%;
            margin: 2.5rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            border: 5px solid white;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .interactive-module {
            background: #f8f9fa;
            border-left: 4px solid #1a73e8;
            padding: 2rem;
            margin: 3rem 0;
            border-radius: 0 8px 8px 0;
        }
        .module-title {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: #2c3e50;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        form {
            display: grid;
            gap: 1.2rem;
            max-width: 600px;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #444;
        }
        .form-control {
            width: 100%;
            padding: 0.85rem 1rem;
            border: 2px solid #ced4da;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            border-color: #1a73e8;
            outline: none;
            box-shadow: 0 0 0 3px rgba(26,115,232,0.2);
        }
        textarea.form-control { min-height: 120px; resize: vertical; }
        .btn {
            background: linear-gradient(to right, #1a73e8, #0d47a1);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 6px;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        .btn:hover {
            background: linear-gradient(to right, #0d47a1, #0a2e6b);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(13,71,161,0.3);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1rem;
        }
        .rating input { display: none; }
        .rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label { color: #ffc107; }
        .site-footer {
            background: #2c3e50;
            color: #cfd8dc;
            padding: 3rem 0 2rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: #fff;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #4fc3f7;
        }
        .footer-links { list-style: none; padding-left: 0; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a {
            color: #b0bec5;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover { color: #4fc3f7; }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 0.8rem;
            background: rgba(255,255,255,0.05);
            border-radius: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #405675;
            font-size: 0.9rem;
            color: #90a4ae;
        }