* {
            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%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: #2c5aa0;
            text-decoration: none;
            transition: color 0.3s ease, transform 0.2s ease;
        }
        a:hover {
            color: #e63946;
            transform: translateY(-1px);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(90deg, #1a2a4a 0%, #2c3e50 100%);
            color: #fff;
            padding: 1.2rem 0;
            box-shadow: 0 4px 20px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(45deg, #4cc9f0, #4361ee);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: 1px;
        }
        .my-logo:hover {
            opacity: 0.9;
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .nav-links a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
        }
        .nav-links a:hover, .nav-links a.active {
            background-color: rgba(255,255,255,0.15);
            color: #4cc9f0;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: #fff;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f8f9fa;
            border-bottom: 1px solid #dee2e6;
            font-size: 0.95rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: #6c757d;
        }
        .breadcrumb a {
            color: #6c757d;
        }
        .breadcrumb a:hover {
            color: #2c5aa0;
        }
        .search-box {
            margin-left: 2rem;
            display: flex;
            align-items: center;
        }
        .search-box form {
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            background: #fff;
            border: 1px solid #ddd;
        }
        .search-box input {
            padding: 0.7rem 1.2rem;
            border: none;
            outline: none;
            min-width: 250px;
            font-size: 1rem;
        }
        .search-box button {
            background-color: #4361ee;
            color: white;
            border: none;
            padding: 0.7rem 1.5rem;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-box button:hover {
            background-color: #3a56d4;
        }
        .main-content {
            flex: 1;
            padding: 2.5rem 0;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
        }
        article {
            background: #fff;
            padding: 2.5rem;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.06);
        }
        .article-header {
            margin-bottom: 2rem;
            padding-bottom: 1.5rem;
            border-bottom: 2px solid #eaeaea;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a2a4a;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .meta {
            color: #666;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        .meta i {
            color: #4361ee;
            margin-right: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #2c3e50;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed #e0e0e0;
        }
        h3 {
            font-size: 1.6rem;
            color: #3a506b;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #4a6572;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight {
            background-color: #f0f7ff;
            border-left: 5px solid #4361ee;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .highlight p:last-child {
            margin-bottom: 0;
        }
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .tip-card {
            background: #f8f9ff;
            padding: 1.5rem;
            border-radius: 10px;
            border: 1px solid #e1e8ff;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .tip-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(67, 97, 238, 0.15);
        }
        .tip-card h4 {
            color: #4361ee;
            margin-top: 0;
        }
        .feature-img {
            margin: 2.5rem auto;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            border: 5px solid white;
        }
        .link-list {
            background-color: #f9f9f9;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .link-list ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
        }
        .link-list li {
            padding: 0.5rem 0;
            border-bottom: 1px dotted #ddd;
        }
        .link-list li:last-child {
            border-bottom: none;
        }
        aside {
            background: #fff;
            padding: 2rem;
            border-radius: 16px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.06);
            align-self: start;
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            color: #1a2a4a;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #4361ee;
        }
        .sidebar-links ul {
            list-style: none;
        }
        .sidebar-links li {
            margin-bottom: 0.8rem;
        }
        .sidebar-links a {
            display: block;
            padding: 0.8rem 1rem;
            background-color: #f8f9fa;
            border-radius: 8px;
            border-left: 4px solid #4361ee;
        }
        .sidebar-links a:hover {
            background-color: #eef2ff;
            border-left-color: #e63946;
        }
        .interactive-section {
            background: #fff;
            padding: 2.5rem;
            border-radius: 16px;
            margin-top: 2.5rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.06);
        }
        .rating-form, .comment-form {
            margin-bottom: 2.5rem;
            padding: 1.5rem;
            background-color: #f8f9ff;
            border-radius: 12px;
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
            font-size: 1.8rem;
            color: #ffd700;
            cursor: pointer;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        form label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        form input, form textarea {
            width: 100%;
            padding: 0.9rem;
            margin-bottom: 1.2rem;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
        }
        form button {
            background: linear-gradient(45deg, #4361ee, #3a56d4);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        form button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(67, 97, 238, 0.4);
        }
        .site-footer {
            background: #1a2a4a;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-widget h4 {
            color: #4cc9f0;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #bdc3c7;
        }
        friend-link a:hover {
            color: #4cc9f0;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2c3e50;
            color: #95a5a6;
            font-size: 0.95rem;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: #1a2a4a;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1.5rem;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
                z-index: 999;
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .search-box {
                margin-left: 0;
                margin-top: 1rem;
                width: 100%;
            }
            .search-box form {
                width: 100%;
            }
            .search-box input {
                min-width: auto;
                flex: 1;
            }
            h1 {
                font-size: 2.2rem;
            }
            article, .interactive-section {
                padding: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                align-items: flex-start;
            }
            .my-logo {
                margin-bottom: 1rem;
            }
            .main-nav {
                width: 100%;
                justify-content: space-between;
                align-items: center;
            }
            .tips-grid {
                grid-template-columns: 1fr;
            }
            .link-list ul {
                grid-template-columns: 1fr;
            }
        }