* { 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: linear-gradient(135deg, #f5f7fa 0%, #f0f2f5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #c62828; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #8e0000; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 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-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-family: 'Impact', fantasy;
            font-size: 2.5rem;
            color: #ffeb3b;
            letter-spacing: 2px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .logo a:hover { color: #ffd600; }
        .nav-container { display: flex; align-items: center; }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li { margin-left: 2rem; }
        .main-nav a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover, .main-nav a.active {
            border-bottom-color: #ffeb3b;
            color: #ffeb3b;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background: #e8eaf6;
            padding: 0.8rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #5c6bc0; }
        .breadcrumb a:hover { color: #3949ab; }
        .search-form {
            margin-left: 2rem;
            display: flex;
        }
        .search-form input {
            padding: 0.6rem 1rem;
            border: none;
            border-radius: 4px 0 0 4px;
            width: 200px;
        }
        .search-form button {
            background: #ff9800;
            color: white;
            border: none;
            padding: 0.6rem 1.2rem;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover { background: #f57c00; }
        .main-content {
            flex: 1;
            padding: 2rem 0;
        }
        article {
            background: white;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            padding: 3rem;
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 3rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #ffeb3b;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.2rem;
            color: #283593;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e8eaf6;
        }
        h3 {
            font-size: 1.8rem;
            color: #3949ab;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #5c6bc0;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            color: #555;
            font-weight: 500;
            margin-bottom: 2rem;
            background: #f9f9f9;
            padding: 1.5rem;
            border-left: 5px solid #ff9800;
            border-radius: 0 8px 8px 0;
        }
        .highlight {
            background: linear-gradient(120deg, #ffeb3b 0%, #ffeb3b 100%);
            background-repeat: no-repeat;
            background-size: 100% 0.4em;
            background-position: 0 88%;
            font-weight: 700;
        }
        .img-container {
            margin: 2.5rem auto;
            text-align: center;
            max-width: 900px;
        }
        .img-container img {
            border-radius: 10px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            border: 1px solid #ddd;
        }
        .img-caption {
            font-style: italic;
            color: #666;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        blockquote {
            border-left: 5px solid #c62828;
            padding-left: 2rem;
            margin: 2rem 0;
            font-style: italic;
            color: #555;
            background: #fff5f5;
            padding: 1.5rem 2rem;
            border-radius: 0 8px 8px 0;
        }
        ul, ol { margin: 1.5rem 0 1.5rem 2rem; }
        li { margin-bottom: 0.8rem; }
        .related-links {
            background: #f3e5f5;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .related-links h4 { color: #7b1fa2; }
        .related-links ul { list-style: none; margin-left: 0; }
        .related-links li:before { content: "💠 "; }
        .update-time {
            text-align: right;
            font-size: 0.9rem;
            color: #777;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px dashed #ccc;
        }
        .interactive-section {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #e9ecef;
        }
        .interactive-section h3 { color: #d84315; }
        .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 #ced4da;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            border-color: #ff9800;
            outline: none;
            box-shadow: 0 0 0 0.2rem rgba(255,152,0,0.25);
        }
        textarea.form-control { min-height: 150px; resize: vertical; }
        .btn {
            display: inline-block;
            background: #ff9800;
            color: white;
            padding: 0.8rem 2rem;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: 600;
            transition: background 0.3s, transform 0.2s;
        }
        .btn:hover {
            background: #f57c00;
            transform: translateY(-2px);
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .star:hover,
        .star.active { color: #ffc107; }
        .site-footer {
            background: #1a237e;
            color: #e3f2fd;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo a {
            font-family: 'Impact', fantasy;
            font-size: 2rem;
            color: #ffeb3b;
        }
        .footer-section h4 {
            color: #ffcc80;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #bbdefb; }
        .footer-links a:hover { color: #ffeb3b; }
        friend-link {
            display: block;
            background: #0d47a1;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1rem 0;
        }
        friend-link a {
            color: #ffeb3b;
            font-weight: bold;
            font-size: 1.1rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #90caf9;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.5rem; }
            h2 { font-size: 2rem; }
            article { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .hamburger { display: block; }
            .main-nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 1rem;
            }
            .main-nav.active { display: block; }
            .main-nav ul {
                flex-direction: column;
                background: #283593;
                border-radius: 8px;
                padding: 1rem;
            }
            .main-nav li { margin: 0.5rem 0; }
            .search-form {
                margin-left: auto;
                margin-right: 1rem;
            }
            .search-form input { width: 150px; }
        }
        @media (max-width: 576px) {
            .container { padding: 0 15px; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            article { padding: 1.5rem; }
            .lead { font-size: 1.1rem; }
            .footer-container { grid-template-columns: 1fr; }
        }