* { 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;
            max-width: 100%;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 { font-weight: 700; color: #1a237e; margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: 2.8rem; margin-top: 1.5rem; border-bottom: 4px solid #ff6d00; padding-bottom: 0.5rem; }
        h2 { font-size: 2.2rem; margin-top: 2.5rem; padding-left: 0.5rem; border-left: 5px solid #3949ab; }
        h3 { font-size: 1.8rem; margin-top: 2rem; color: #5c6bc0; }
        h4 { font-size: 1.4rem; margin-top: 1.5rem; color: #7986cb; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; }
        a { color: #1a237e; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #ff6d00; }
        strong { color: #d84315; }
        em { font-style: italic; color: #555; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: #ffab00;
            text-transform: uppercase;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo:hover { color: #ffd740; }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li { margin-left: 2rem; }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover { color: #ffab00; }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #ffab00;
            transition: width 0.3s;
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a { color: #5c6bc0; }
        .breadcrumb a:hover { color: #ff6d00; }
        .breadcrumb .separator { margin: 0 0.5rem; color: #999; }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-wrapper { grid-template-columns: 1fr; }
        }
        .main-article { background: white; padding: 2.5rem; border-radius: 12px; box-shadow: 0 6px 20px rgba(0,0,0,0.08); }
        .sidebar {
            background: white;
            padding: 1.8rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .feature-box {
            background: #f3f4ff;
            border-left: 5px solid #3949ab;
            padding: 1.5rem;
            margin: 2.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-box h3 { margin-top: 0; color: #1a237e; }
        form input, form textarea, form select {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 2px solid #ddd;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        form input:focus, form textarea:focus {
            border-color: #5c6bc0;
            outline: none;
        }
        button, .btn {
            background: linear-gradient(to right, #ff6d00, #ff9100);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-block;
            text-align: center;
        }
        button:hover, .btn:hover {
            background: linear-gradient(to right, #e65100, #ff6d00);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(255, 109, 0, 0.3);
        }
        .star-rating { display: flex; gap: 0.5rem; margin: 1rem 0; }
        .star-rating i { color: #ffd740; cursor: pointer; font-size: 1.5rem; transition: color 0.2s; }
        .star-rating i:hover, .star-rating i.active { color: #ffab00; }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            border: 3px solid white;
        }
        .content-link {
            background-color: #f0f7ff;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            border-bottom: 2px dotted #5c6bc0;
            font-weight: 600;
        }
        .content-link:hover {
            background-color: #e3f2fd;
            border-bottom-style: solid;
        }
        ul, ol { margin-left: 2rem; margin-bottom: 1.5rem; }
        li { margin-bottom: 0.7rem; }
        .site-footer {
            background: linear-gradient(135deg, #1a237e 0%, #0d153a 100%);
            color: #e8eaf6;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #ffab00;
            margin-bottom: 1.2rem;
            font-size: 1.3rem;
        }
        .footer-links { list-style: none; margin-left: 0; }
        .footer-links li { margin-bottom: 0.6rem; }
        .footer-links a { color: #c5cae9; }
        .footer-links a:hover { color: #ffab00; padding-left: 5px; transition: all 0.3s; }
        friend-link {
            display: inline-block;
            background: rgba(255, 255, 255, 0.1);
            padding: 0.5rem 1rem;
            border-radius: 5px;
            margin: 0.3rem;
            border: 1px solid #5c6bc0;
        }
        friend-link a { color: #ffd740; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #9fa8da;
        }
        .text-center { text-align: center; }
        .mb-3 { margin-bottom: 3rem; }
        .mt-3 { margin-top: 3rem; }
        .update-time {
            background: #e8f5e9;
            padding: 0.7rem;
            border-radius: 5px;
            margin: 1.5rem 0;
            font-style: italic;
            color: #2e7d32;
            border-left: 4px solid #4caf50;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .header-container { flex-direction: column; align-items: flex-start; }
            .main-nav { width: 100%; margin-top: 1rem; display: none; }
            .main-nav.active { display: block; }
            .main-nav ul { flex-direction: column; }
            .main-nav li { margin: 0.7rem 0; margin-left: 0; }
            .hamburger { display: block; position: absolute; top: 1.2rem; right: 20px; }
            .content-wrapper, .footer-container { grid-template-columns: 1fr; }
            .main-article, .sidebar { padding: 1.5rem; }
            .sidebar { position: static; }
        }