:root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #fbbf24;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            --border-radius: 12px;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--bg-light);
            padding-top: 80px;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--bg-white);
            box-shadow: var(--shadow);
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--secondary-color);
        }
        .my-logo:hover {
            color: var(--secondary-color);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        nav a {
            font-weight: 600;
            color: var(--text-dark);
            padding: 5px 0;
            position: relative;
        }
        nav a:hover {
            color: var(--primary-color);
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--primary-color);
            transition: var(--transition);
        }
        nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--primary-color);
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: #e5e7eb;
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--primary-color);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        article {
            background-color: var(--bg-white);
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 20px;
            margin-bottom: 30px;
            border-bottom: 2px solid #e5e7eb;
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .update-time {
            background-color: #fef3c7;
            padding: 5px 10px;
            border-radius: 20px;
            color: #92400e;
        }
        h2 {
            font-size: 2rem;
            color: var(--secondary-color);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--accent-color);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--primary-color);
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--text-dark);
            margin: 25px 0 10px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--primary-color);
            margin-bottom: 30px;
            padding: 15px;
            background-color: #eff6ff;
            border-left: 5px solid var(--primary-color);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .highlight {
            background-color: #fef3c7;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            border-left: 5px solid var(--accent-color);
        }
        .highlight strong {
            color: #92400e;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow);
            display: block;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--text-light);
            margin-top: -15px;
            margin-bottom: 30px;
        }
        .related-links {
            background-color: #f8fafc;
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 30px 0;
        }
        .related-links h3 {
            margin-top: 0;
        }
        .related-links ul {
            list-style-position: inside;
            color: var(--primary-color);
        }
        .related-links li {
            margin-bottom: 10px;
            padding-left: 10px;
        }
        .related-links a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        aside {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background-color: var(--bg-white);
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-color);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .widget-title i {
            color: var(--secondary-color);
        }
        .search-form input {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #d1d5db;
            border-radius: 30px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-form input:focus {
            outline: none;
            border-color: var(--primary-color);
        }
        .search-form button {
            width: 100%;
            padding: 12px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            margin-top: 15px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background-color: var(--secondary-color);
        }
        .rating-widget .stars {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin: 20px 0;
            font-size: 2rem;
            color: #d1d5db;
        }
        .stars i {
            cursor: pointer;
            transition: var(--transition);
        }
        .stars i:hover,
        .stars i.active {
            color: var(--accent-color);
        }
        .comment-form textarea {
            width: 100%;
            padding: 15px;
            border: 2px solid #d1d5db;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            resize: vertical;
            min-height: 120px;
            margin-bottom: 15px;
            transition: var(--transition);
        }
        .comment-form textarea:focus {
            outline: none;
            border-color: var(--primary-color);
        }
        .comment-form button {
            padding: 12px 25px;
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background-color: var(--primary-color);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 20px;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
        }
        .footer-column h3 {
            color: var(--accent-color);
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-column ul {
            list-style: none;
        }
        .footer-column li {
            margin-bottom: 10px;
        }
        .footer-column a:hover {
            color: var(--accent-color);
        }
        friend-link {
            display: block;
            padding: 10px 15px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 6px;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateX(5px);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            color: #d1d5db;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 2.3rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            body {
                padding-top: 70px;
            }
            .header-container {
                padding: 12px 20px;
            }
            nav ul {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 80%;
                height: calc(100vh - 70px);
                background-color: var(--bg-white);
                flex-direction: column;
                padding: 30px;
                box-shadow: var(--shadow);
                transition: var(--transition);
                z-index: 999;
            }
            nav ul.active {
                left: 0;
            }
            .hamburger {
                display: block;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
            article {
                padding: 25px;
            }
            .footer-container {
                flex-direction: column;
            }
        }
        .btn {
            display: inline-block;
            padding: 12px 25px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(220, 38, 38, 0.3);
        }
        .stat-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-item {
            text-align: center;
            padding: 20px;
            background-color: #eff6ff;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-5px);
            background-color: #dbeafe;
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-label {
            color: var(--text-light);
            font-size: 0.9rem;
            margin-top: 10px;
        }
        .tooltip {
            position: relative;
            border-bottom: 1px dashed var(--primary-color);
            cursor: help;
        }
        .tooltip-text {
            visibility: hidden;
            width: 250px;
            background-color: var(--text-dark);
            color: white;
            text-align: center;
            padding: 10px;
            border-radius: 6px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.9rem;
        }
        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }
        ::selection {
            background-color: var(--accent-color);
            color: var(--text-dark);
        }