* { 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;
            background-image: linear-gradient(to bottom, #e9ecef 0%, #f8f9fa 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2a6ebb; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #1d4a7c; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .site-header {
            background: linear-gradient(135deg, #1a365d 0%, #2d4a7a 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-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(to right, #ffd166, #ff9e00);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: 1px;
        }
        .my-logo a { background: transparent; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .main-nav a {
            color: #e2e8f0;
            font-weight: 600;
            padding: 0.5rem 0.75rem;
            border-radius: 4px;
        }
        .main-nav a:hover,
        .main-nav a:focus {
            background-color: rgba(255, 255, 255, 0.15);
            text-decoration: none;
            color: white;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 0.75rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 0.5rem;
            color: #a0aec0;
        }
        .search-section {
            background: #fff;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin: 2rem 0;
            text-align: center;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex-grow: 1;
            padding: 0.85rem 1rem;
            border: 2px solid #cbd5e0;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-input:focus { border-color: #2a6ebb; }
        .search-btn {
            background: linear-gradient(to right, #2a6ebb, #1d4a7c);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-size: 1rem;
            transition: opacity 0.3s;
        }
        .search-btn:hover { opacity: 0.95; }
        main { flex-grow: 1; padding: 2rem 0; }
        article { background: white; padding: 2.5rem; border-radius: 12px; box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08); }
        h1 { font-size: 2.5rem; color: #1a365d; margin-bottom: 1.5rem; line-height: 1.2; border-left: 5px solid #ff9e00; padding-left: 1rem; }
        h2 { font-size: 2rem; color: #2d4a7a; margin: 2.5rem 0 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid #e2e8f0; }
        h3 { font-size: 1.6rem; color: #4a5568; margin: 2rem 0 1rem; }
        h4 { font-size: 1.3rem; color: #718096; margin: 1.5rem 0 0.75rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.2rem; color: #4a5568; font-weight: 500; margin-bottom: 2rem; }
        .highlight-box {
            background: linear-gradient(to right, #fff9db, #fff3bf);
            border-left: 5px solid #ffd43b;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .content-img {
            margin: 2.5rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            max-width: 800px;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #718096;
            padding: 0.5rem;
            font-size: 0.95rem;
        }
        .related-links {
            background: #f1f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .related-links h3 { margin-top: 0; }
        .related-links ul { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 0.75rem; }
        .related-links li a { display: block; padding: 0.6rem; background: white; border-radius: 6px; border: 1px solid #d1e3ff; }
        .related-links li a:hover { background: #e7f2ff; border-color: #2a6ebb; }
        .interactive-section {
            background: #fff;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
            border-top: 4px solid #38b2ac;
        }
        .rating-form, .comment-form {
            display: grid;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #e2e8f0;
            cursor: pointer;
            margin-bottom: 1rem;
        }
        .star-rating .star:hover,
        .star-rating .star.active { color: #ffd166; }
        .form-group { display: flex; flex-direction: column; gap: 0.5rem; }
        label { font-weight: 600; color: #4a5568; }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-size: 1rem;
            font-family: inherit;
        }
        input:focus, textarea:focus, select:focus { outline: none; border-color: #2a6ebb; box-shadow: 0 0 0 3px rgba(42, 110, 187, 0.1); }
        .submit-btn {
            background: linear-gradient(to right, #38b2ac, #2c7a7b);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            font-size: 1rem;
            transition: transform 0.2s, box-shadow 0.2s;
            justify-self: start;
        }
        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(56, 178, 172, 0.4);
        }
        .site-footer {
            background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
            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-section h3 { color: #e2e8f0; margin-bottom: 1.5rem; font-size: 1.3rem; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.75rem; }
        .footer-links a { color: #a0aec0; }
        .footer-links a:hover { color: #fff; }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.05);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            margin: 0.25rem;
            color: #90cdf4;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        .update-time {
            font-size: 0.9rem;
            color: #718096;
            margin-top: 2rem;
            text-align: right;
            font-style: italic;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .main-nav { order: 3; flex-basis: 100%; margin-top: 1rem; display: none; }
            .main-nav.active { display: block; }
            .main-nav ul { flex-direction: column; gap: 0.5rem; }
            .hamburger { display: block; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.4rem; }
            article { padding: 1.5rem; }
            .related-links ul { grid-template-columns: 1fr; }
            .search-form { flex-direction: column; }
            .search-input, .search-btn { border-radius: 8px; width: 100%; }
            .search-input { margin-bottom: 0.5rem; }
        }