* { 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%, #e4edf5 100%);
            color: #2c3e50;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: #2980b9; transition: color 0.3s ease, transform 0.2s ease; }
        a:hover { color: #1a5276; transform: translateY(-2px); }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif; margin-bottom: 1rem; color: #1a237e; font-weight: 700; }
        h1 { font-size: 2.8rem; line-height: 1.2; border-bottom: 4px solid #3498db; padding-bottom: 0.5rem; margin-top: 1.5rem; }
        h2 { font-size: 2.2rem; color: #283593; padding-left: 0.5rem; border-left: 5px solid #ff9800; margin-top: 2.5rem; }
        h3 { font-size: 1.8rem; color: #3949ab; margin-top: 2rem; }
        h4 { font-size: 1.4rem; color: #5c6bc0; margin-top: 1.5rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.3rem; font-weight: 300; color: #546e7a; }
        .highlight { background-color: #fffde7; padding: 0.2rem 0.5rem; border-radius: 3px; font-weight: 600; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 30px 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .site-header {
            background: linear-gradient(90deg, #0d47a1, #1565c0);
            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: 2.2rem;
            font-weight: 900;
            color: white;
            text-transform: uppercase;
            letter-spacing: 2px;
            background: linear-gradient(45deg, #ffeb3b, #ff9800);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            padding: 5px;
            transition: all 0.4s ease;
        }
        .my-logo:hover {
            transform: scale(1.05);
            text-shadow: 0 0 15px rgba(255, 152, 0, 0.5);
        }
        .nav-primary {
            display: flex;
            gap: 2rem;
        }
        .nav-primary a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .nav-primary a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            color: #fff;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-primary {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #1565c0;
                padding: 1rem;
                display: none;
                box-shadow: 0 5px 10px rgba(0,0,0,0.2);
            }
            .nav-primary.active { display: flex; }
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #e8eaf6;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 10px;
            color: #757575;
        }
        .breadcrumb a { color: #5c6bc0; }
        .breadcrumb a:hover { text-decoration: underline; }
        .sidebar {
            background: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .widget {
            margin-bottom: 2.5rem;
        }
        .widget-title {
            font-size: 1.4rem;
            color: #1a237e;
            border-bottom: 2px dashed #bbdefb;
            padding-bottom: 0.5rem;
            margin-bottom: 1.2rem;
        }
        .search-form {
            display: flex;
        }
        .search-input {
            flex-grow: 1;
            padding: 12px 15px;
            border: 2px solid #bbdefb;
            border-radius: 6px 0 0 6px;
            font-size: 1rem;
            outline: none;
            transition: border 0.3s;
        }
        .search-input:focus { border-color: #2196f3; }
        .search-btn {
            background: #2196f3;
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 6px 6px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.3s;
        }
        .search-btn:hover { background: #0d47a1; }
        .rating-widget, .comment-widget {
            background: #f8fdff;
            padding: 20px;
            border-radius: 8px;
            border: 1px solid #e1f5fe;
        }
        .stars {
            display: flex;
            gap: 8px;
            margin: 10px 0;
            font-size: 1.8rem;
            color: #ffc107;
        }
        .star { cursor: pointer; transition: transform 0.2s; }
        .star:hover { transform: scale(1.2); }
        .form-group { margin-bottom: 1.2rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #455a64; }
        input[type="text"],
        input[type="email"],
        textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #b0bec5;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s, box-shadow 0.3s;
        }
        input:focus, textarea:focus {
            outline: none;
            border-color: #2196f3;
            box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
        }
        .submit-btn {
            background: linear-gradient(90deg, #00c853, #64dd17);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 6px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            width: 100%;
        }
        .submit-btn:hover {
            background: linear-gradient(90deg, #00e676, #76ff03);
            box-shadow: 0 5px 15px rgba(0, 200, 83, 0.4);
        }
        .article-content {
            background: white;
            border-radius: 12px;
            padding: 35px;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.07);
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid #e0e0e0;
            padding-bottom: 1rem;
            margin-bottom: 2rem;
            font-size: 0.95rem;
            color: #757575;
        }
        .featured-image {
            width: 100%;
            border-radius: 10px;
            overflow: hidden;
            margin: 2rem 0;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .featured-image img {
            width: 100%;
            transition: transform 0.6s ease;
        }
        .featured-image:hover img {
            transform: scale(1.03);
        }
        .figcaption {
            text-align: center;
            font-style: italic;
            padding: 0.8rem;
            color: #616161;
            background: #f5f5f5;
        }
        .content-block {
            margin-bottom: 2.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid #eeeeee;
        }
        .tips {
            background: #e8f5e9;
            border-left: 5px solid #4caf50;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .warning {
            background: #fff3e0;
            border-left: 5px solid #ff9800;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .internal-link {
            background-color: #f0f7ff;
            padding: 2px 6px;
            border-radius: 4px;
            border-bottom: 2px solid #90caf9;
            font-weight: 600;
        }
        .internal-link:hover {
            background-color: #e1f5fe;
            border-bottom-color: #2196f3;
        }
        .site-footer {
            background: linear-gradient(90deg, #1a237e, #283593);
            color: #e8eaf6;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        .footer-widget h3 {
            color: #bbdefb;
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #c5cae9; }
        .footer-links a:hover { color: #ffcc80; padding-left: 5px; }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 15px;
            border-radius: 6px;
            margin-bottom: 10px;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        friend-link a {
            color: #8c9eff;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #9fa8da;
        }
        .text-center { text-align: center; }
        .mt-2 { margin-top: 2rem; }
        .mb-2 { margin-bottom: 2rem; }
        .last-updated {
            font-size: 0.9rem;
            color: #78909c;
            font-style: italic;
        }