* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-blue: #2563eb;
            --secondary-blue: #1d4ed8;
            --accent-orange: #f97316;
            --light-bg: #f8fafc;
            --dark-text: #1e293b;
            --medium-gray: #64748b;
            --light-gray: #e2e8f0;
            --border-radius: 12px;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: var(--dark-text);
            background-color: var(--light-bg);
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
            color: var(--secondary-blue);
        }
        h1 {
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-orange));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        h2 {
            font-size: 2.2rem;
            border-left: 5px solid var(--accent-orange);
            padding-left: 1rem;
            margin-top: 3rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--dark-text);
            margin-top: 2.5rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--medium-gray);
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 2rem;
        }
        .site-header {
            background: white;
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-blue);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .my-logo:hover {
            color: var(--secondary-blue);
            transform: scale(1.02);
            transition: var(--transition);
        }
        .my-logo i {
            color: var(--accent-orange);
        }
        .search-form {
            display: flex;
            max-width: 400px;
            width: 100%;
        }
        .search-input {
            flex: 1;
            padding: 0.8rem 1.2rem;
            border: 2px solid var(--light-gray);
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-input:focus {
            outline: none;
            border-color: var(--primary-blue);
        }
        .search-button {
            background: var(--primary-blue);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-button:hover {
            background: var(--secondary-blue);
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid var(--light-gray);
            padding: 1rem 0;
        }
        .main-nav {
            display: flex;
            gap: 2rem;
        }
        .nav-link {
            text-decoration: none;
            color: var(--dark-text);
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--primary-blue);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent-orange);
            transition: var(--transition);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--primary-blue);
            cursor: pointer;
        }
        .breadcrumb {
            background: var(--light-gray);
            padding: 1rem 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: var(--medium-gray);
        }
        .breadcrumb a {
            color: var(--medium-gray);
            text-decoration: none;
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .breadcrumb [aria-current="page"] {
            color: var(--dark-text);
            font-weight: 600;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 3rem;
            margin: 3rem 0;
        }
        .article-content {
            background: white;
            padding: 3rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-md);
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 2px solid var(--light-gray);
            color: var(--medium-gray);
            font-size: 0.95rem;
        }
        .update-time {
            color: var(--accent-orange);
            font-weight: 600;
        }
        .featured-image {
            width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2rem 0;
            box-shadow: var(--shadow-md);
            transition: transform 0.5s ease;
        }
        .featured-image:hover {
            transform: scale(1.01);
        }
        .highlight-box {
            background: linear-gradient(135deg, #dbeafe, #fef3c7);
            border-left: 5px solid var(--accent-orange);
            padding: 2rem;
            margin: 2.5rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .tip {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            background: #f0f9ff;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin: 2rem 0;
        }
        .tip-icon {
            color: var(--primary-blue);
            font-size: 1.5rem;
            flex-shrink: 0;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
        }
        .widget-title {
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid var(--light-gray);
        }
        .related-links {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 1rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--light-gray);
        }
        .related-links a {
            text-decoration: none;
            color: var(--dark-text);
            display: flex;
            align-items: center;
            gap: 0.8rem;
            transition: var(--transition);
        }
        .related-links a:hover {
            color: var(--primary-blue);
            transform: translateX(5px);
        }
        .related-links i {
            color: var(--accent-orange);
        }
        .rating-widget {
            text-align: center;
        }
        .star-rating {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            margin: 1.5rem 0;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: var(--light-gray);
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label,
        .star-rating input:checked ~ label {
            color: #fbbf24;
        }
        .rating-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .rating-form input,
        .rating-form textarea {
            padding: 0.8rem;
            border: 2px solid var(--light-gray);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .rating-form input:focus,
        .rating-form textarea:focus {
            outline: none;
            border-color: var(--primary-blue);
        }
        .rating-form button {
            background: var(--primary-blue);
            color: white;
            border: none;
            padding: 1rem;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-form button:hover {
            background: var(--secondary-blue);
        }
        .comments-section {
            margin-top: 4rem;
            padding-top: 3rem;
            border-top: 2px solid var(--light-gray);
        }
        .comment-form {
            background: var(--light-bg);
            padding: 2rem;
            border-radius: var(--border-radius);
            margin-bottom: 3rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid var(--light-gray);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary-blue);
        }
        .submit-btn {
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-orange));
            color: white;
            border: none;
            padding: 1rem 2.5rem;
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .site-footer {
            background: var(--dark-text);
            color: white;
            padding: 4rem 0 2rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: var(--border-radius);
            margin: 1rem 0;
            text-align: center;
        }
        friend-link a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
        }
        friend-link a:hover {
            color: var(--accent-orange);
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #94a3b8;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .main-content {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
            .header-top {
                flex-direction: column;
                gap: 1rem;
                text-align: center;
            }
            .search-form {
                max-width: 100%;
            }
            .mobile-menu-btn {
                display: block;
                position: absolute;
                top: 1rem;
                right: 1rem;
            }
            .nav-container {
                flex-direction: column;
                align-items: flex-start;
                display: none;
            }
            .nav-container.active {
                display: flex;
            }
            .main-nav {
                flex-direction: column;
                gap: 1rem;
                width: 100%;
            }
            .article-content {
                padding: 2rem 1.5rem;
            }
            .article-meta {
                flex-direction: column;
                gap: 1rem;
                text-align: center;
            }
            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        @media print {
            .site-header,
            .sidebar,
            .comments-section,
            .site-footer,
            .search-form,
            .rating-form {
                display: none;
            }
            .article-content {
                box-shadow: none;
                padding: 0;
            }
            body {
                background: white;
                color: black;
            }
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        :focus-visible {
            outline: 3px solid var(--accent-orange);
            outline-offset: 3px;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .article-content {
            animation: fadeIn 0.8s ease-out;
        }
        ::-webkit-scrollbar {
            width: 10px;
        }
        ::-webkit-scrollbar-track {
            background: var(--light-bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--primary-blue);
            border-radius: 5px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--secondary-blue);
        }