* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary-blue: #00a2ff;
            --secondary-purple: #9c27b0;
            --dark-bg: #1a1a2e;
            --content-bg: #f8f9fa;
            --text-dark: #2d3436;
            --text-light: #636e72;
            --accent-yellow: #f9c74f;
            --border-color: #dfe6e9;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--content-bg);
            color: var(--text-dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark-bg) 0%, #16213e 100%);
            color: white;
            padding: 1rem 5%;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .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: var(--primary-blue);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: 1px;
            text-transform: uppercase;
        }
        .my-logo i {
            color: var(--accent-yellow);
        }
        .my-logo:hover {
            color: white;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #ddd;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
            font-size: 1rem;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: var(--primary-blue);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            background: white;
            padding: 1rem 5%;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            max-width: 1400px;
            margin: 0 auto;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--primary-blue);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .container {
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 5%;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .main-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: white;
            padding: 1.8rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark-bg);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 5px solid var(--primary-blue);
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--secondary-purple);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed var(--border-color);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--dark-bg);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: var(--text-light);
            margin: 1.5rem 0 0.8rem;
        }
        .article-meta {
            display: flex;
            gap: 1.5rem;
            margin-bottom: 2rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-light);
            font-size: 0.95rem;
        }
        .meta-item i {
            margin-right: 6px;
            color: var(--primary-blue);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.05rem;
        }
        .highlight {
            background-color: rgba(0, 162, 255, 0.08);
            border-left: 4px solid var(--primary-blue);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .highlight strong {
            color: var(--primary-blue);
        }
        .key-point {
            background: linear-gradient(to right, #f9c74f22, #f9844a22);
            padding: 1.2rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border: 1px solid #f9c74f66;
        }
        .key-point::before {
            content: '💡';
            margin-right: 10px;
            font-size: 1.2rem;
        }
        em {
            color: var(--secondary-purple);
            font-style: italic;
        }
        strong {
            color: var(--dark-bg);
            font-weight: 700;
        }
        a.content-link {
            color: var(--primary-blue);
            text-decoration: none;
            border-bottom: 1px dotted var(--primary-blue);
            transition: var(--transition);
        }
        a.content-link:hover {
            color: var(--secondary-purple);
            border-bottom: 1px solid var(--secondary-purple);
        }
        .featured-image {
            width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
            border: 1px solid var(--border-color);
        }
        ul, ol {
            margin: 1.5rem 0 1.5rem 2rem;
        }
        li {
            margin-bottom: 0.8rem;
        }
        .interactive-box {
            background: #f8f9fa;
            padding: 1.8rem;
            border-radius: 10px;
            margin: 2.5rem 0;
            border: 1px solid var(--border-color);
        }
        .interactive-box h3 {
            margin-top: 0;
            color: var(--secondary-purple);
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(0, 162, 255, 0.2);
        }
        .btn {
            background: linear-gradient(to right, var(--primary-blue), #0077cc);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn:hover {
            background: linear-gradient(to right, #0077cc, #005fa3);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 119, 204, 0.3);
        }
        .btn-purple {
            background: linear-gradient(to right, var(--secondary-purple), #7b1fa2);
        }
        .btn-purple:hover {
            background: linear-gradient(to right, #7b1fa2, #6a1b9a);
            box-shadow: 0 4px 12px rgba(156, 39, 176, 0.3);
        }
        .stars {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .star {
            color: #ddd;
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: var(--accent-yellow);
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h4 {
            background: linear-gradient(90deg, var(--dark-bg), #2d3748);
            color: white;
            padding: 0.8rem 1.2rem;
            border-radius: 6px;
            margin-top: 0;
            font-size: 1.1rem;
        }
        .sidebar-links {
            list-style: none;
            margin: 1rem 0 0 0;
        }
        .sidebar-links li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed var(--border-color);
        }
        .sidebar-links a {
            color: var(--text-dark);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .sidebar-links a:hover {
            color: var(--primary-blue);
            padding-left: 5px;
        }
        .sidebar-links i {
            color: var(--secondary-purple);
            font-size: 0.9rem;
        }
        .site-footer {
            background: var(--dark-bg);
            color: #ccc;
            padding: 3rem 5% 2rem;
            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-col h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
            position: relative;
            padding-bottom: 0.7rem;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 40px;
            height: 3px;
            background: var(--primary-blue);
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #aaa;
            text-decoration: none;
            transition: var(--transition);
        }
        friend-link a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #333;
            font-size: 0.9rem;
            color: #888;
        }
        .copyright a {
            color: var(--primary-blue);
            text-decoration: none;
        }
        @media (max-width: 1024px) {
            .container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .sidebar {
                position: static;
            }
            h1 {
                font-size: 2.4rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .main-nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav a {
                display: block;
                padding: 0.8rem 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }
            .hamburger {
                display: block;
            }
            .main-content, .sidebar {
                padding: 1.5rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 480px) {
            .article-meta {
                flex-direction: column;
                gap: 0.5rem;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            h1 {
                font-size: 1.8rem;
            }
        }