* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 1rem 2rem;
            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;
            max-width: 1400px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            text-decoration: none;
            font-family: 'Trebuchet MS', sans-serif;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .my-logo i {
            color: #4fc3f7;
        }
        .my-logo span {
            background: linear-gradient(to right, #4fc3f7, #29b6f6);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2.5rem;
        }
        .main-nav a {
            color: #e3f2fd;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0;
            position: relative;
            transition: color 0.3s ease;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: #4fc3f7;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #4fc3f7;
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 2rem;
            font-size: 0.9rem;
            border-bottom: 1px solid #c5cae9;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.7rem;
            max-width: 1400px;
            margin: 0 auto;
        }
        .breadcrumb li {
            display: inline;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.7rem;
            color: #5c6bc0;
        }
        .breadcrumb a {
            color: #3949ab;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .main-container {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 300px;
            gap: 3rem;
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
        }
        .article-content {
            background: white;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.07);
            padding: 3rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #4fc3f7;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 3rem 0 1.5rem;
            padding-top: 1rem;
            border-top: 1px dashed #c5cae9;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 2rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.2rem;
            color: #555;
            font-weight: 500;
            background: #f3f5ff;
            padding: 1.5rem;
            border-left: 5px solid #4fc3f7;
            border-radius: 0 8px 8px 0;
            margin-bottom: 2.5rem;
        }
        strong {
            color: #1a237e;
            font-weight: 700;
        }
        em {
            color: #d81b60;
            font-style: italic;
        }
        blockquote {
            border-left: 4px solid #29b6f6;
            padding-left: 1.5rem;
            margin: 2rem 0;
            color: #546e7a;
            font-style: italic;
            background: #f4f9ff;
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
        }
        .interactive-module {
            background: #e3f2fd;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #bbdefb;
        }
        .interactive-module h3 {
            margin-top: 0;
            color: #1565c0;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #0d47a1;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #90caf9;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s, box-shadow 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #1a237e;
            box-shadow: 0 0 0 3px rgba(26, 35, 126, 0.2);
        }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, #1a237e, #283593);
            color: white;
            padding: 0.9rem 2rem;
            border: none;
            border-radius: 6px;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            font-size: 1rem;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(26, 35, 126, 0.25);
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: #ffb300;
        }
        .sidebar {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            font-size: 1.4rem;
            margin-top: 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e0e0e0;
        }
        .related-links ul {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 0.9rem;
        }
        .related-links a {
            color: #3949ab;
            text-decoration: none;
            display: block;
            padding: 0.7rem;
            border-radius: 6px;
            transition: background 0.3s, padding-left 0.3s;
        }
        .related-links a:hover {
            background: #f3f5ff;
            padding-left: 1.2rem;
        }
        .update-time {
            background: #e8f5e9;
            padding: 1rem;
            border-radius: 8px;
            margin-top: 2rem;
            font-size: 0.9rem;
            color: #2e7d32;
            text-align: center;
        }
        .article-image {
            margin: 2.5rem auto;
            text-align: center;
        }
        .article-image img {
            border-radius: 10px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            max-height: 500px;
            object-fit: cover;
        }
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .site-footer {
            background: #1a237e;
            color: #e3f2fd;
            padding: 3rem 2rem 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
        }
        .footer-section h4 {
            color: #bbdefb;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        friend-link {
            display: block;
            margin-bottom: 1rem;
        }
        friend-link a {
            color: #c5cae9;
            text-decoration: none;
            transition: color 0.3s;
        }
        friend-link a:hover {
            color: #4fc3f7;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #9fa8da;
        }
        @media (max-width: 1100px) {
            .main-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .site-header {
                padding: 1rem;
            }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #283593;
                padding: 1rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
            }
            .main-nav.active ul {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .article-content {
                padding: 2rem 1.5rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .main-container {
                padding: 0 1rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        .highlight {
            background: linear-gradient(120deg, #e1f5fe 0%, #f3e5f5 100%);
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3em;
        }
        .fade-in {
            animation: fadeIn 1s ease-in-out;
        }
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }