* { 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: #f9f9f9;
            max-width: 100vw;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { color: #2c3e50; margin-bottom: 1rem; font-weight: 700; line-height: 1.3; }
        h1 { font-size: 2.8rem; margin-top: 1.5rem; border-bottom: 4px solid #3498db; padding-bottom: 0.5rem; }
        h2 { font-size: 2.2rem; color: #2980b9; margin-top: 2.5rem; padding-left: 0.5rem; border-left: 5px solid #e74c3c; }
        h3 { font-size: 1.8rem; color: #16a085; margin-top: 2rem; }
        h4 { font-size: 1.4rem; color: #8e44ad; margin-top: 1.5rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        a { color: #3498db; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e74c3c; }
        strong { font-weight: 700; color: #2c3e50; }
        em { font-style: italic; }
        blockquote {
            border-left: 5px solid #f1c40f;
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            color: #555;
            background-color: #fef9e7;
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
        }
        ul, ol { margin: 1rem 0 1.5rem 2rem; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
            color: white;
            padding: 1.5rem 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;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.8rem;
            font-weight: 900;
            color: #f1c40f;
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        .my-logo span {
            color: #3498db;
            text-shadow: 2px 2px 0 #2c3e50;
            letter-spacing: -1px;
        }
        .my-logo:hover { color: #f39c12; }
        .breadcrumb {
            background-color: #ecf0f1;
            padding: 1rem 0;
            font-size: 0.95rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            margin: 0;
            padding: 0;
        }
        .breadcrumb li {
            margin: 0;
            margin-right: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: #7f8c8d;
        }
        .breadcrumb a { color: #7f8c8d; }
        .breadcrumb a:hover { color: #3498db; }
        .nav-container {
            display: flex;
            align-items: center;
        }
        .main-nav {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .main-nav li { margin-left: 2rem; }
        .main-nav a {
            color: white;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover {
            color: #f1c40f;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: #f1c40f;
            transition: width 0.3s;
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .search-form {
            display: flex;
            margin: 2rem auto;
            max-width: 600px;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .search-input {
            flex-grow: 1;
            padding: 1rem 1.5rem;
            border: none;
            font-size: 1.1rem;
            background-color: white;
        }
        .search-button {
            background: linear-gradient(to right, #3498db, #2980b9);
            color: white;
            border: none;
            padding: 0 2rem;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-button:hover { background: linear-gradient(to right, #2980b9, #1c6ea4); }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-content {
            background-color: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0,0,0,0.08);
        }
        .update-time {
            font-size: 0.9rem;
            color: #7f8c8d;
            text-align: right;
            margin-bottom: 2rem;
            font-style: italic;
        }
        .featured-img {
            width: 100%;
            border-radius: 12px;
            margin: 2rem auto;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .sidebar {
            background-color: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0,0,0,0.08);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            border-bottom: 2px solid #3498db;
            padding-bottom: 0.5rem;
            margin-top: 0;
        }
        .link-list { list-style: none; margin: 0; padding: 0; }
        .link-list li { margin-bottom: 0.8rem; padding-left: 1.2rem; position: relative; }
        .link-list li::before {
            content: '🃏';
            position: absolute;
            left: 0;
        }
        .sidebar-widget { margin-bottom: 2.5rem; }
        .interaction-form {
            background-color: #f8f9fa;
            padding: 2rem;
            border-radius: 12px;
            margin: 3rem 0;
            border-left: 5px solid #3498db;
        }
        .form-group { margin-bottom: 1.5rem; }
        .form-label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
        .form-input, .form-textarea {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-input:focus, .form-textarea:focus {
            border-color: #3498db;
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        .form-textarea { min-height: 120px; resize: vertical; }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ddd;
            margin-bottom: 1rem;
        }
        .star-rating .star { cursor: pointer; transition: color 0.2s; }
        .star-rating .star:hover,
        .star-rating .star.active { color: #f1c40f; }
        .submit-button {
            background: linear-gradient(to right, #2ecc71, #27ae60);
            color: white;
            border: none;
            padding: 1rem 2.5rem;
            font-size: 1.1rem;
            border-radius: 50px;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
        }
        .submit-button:hover {
            background: linear-gradient(to right, #27ae60, #219653);
            transform: translateY(-2px);
        }
        .site-footer {
            background: linear-gradient(135deg, #2c3e50 0%, #1a252f 100%);
            color: #bdc3c7;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section { flex: 1; min-width: 250px; }
        .footer-section h4 {
            color: #f1c40f;
            margin-bottom: 1.5rem;
            border-bottom: 2px solid #34495e;
            padding-bottom: 0.5rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        friend-link a:hover { color: #3498db; }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #34495e;
            font-size: 0.9rem;
            color: #95a5a6;
        }
        @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 {
                flex-direction: column;
                width: 100%;
                margin-top: 1.5rem;
                display: none;
            }
            .main-nav.active { display: flex; }
            .main-nav li { margin: 0; margin-bottom: 1rem; }
            .hamburger { display: block; align-self: flex-end; margin-top: -3rem; }
            .article-content { padding: 1.5rem; }
            .sidebar { padding: 1.5rem; position: static; }
        }
        .text-center { text-align: center; }
        .mb-3 { margin-bottom: 3rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; }