:root {
            --primary-dark: #1a365d;
            --primary-medium: #2d4a8a;
            --primary-light: #4a6fa5;
            --accent-warm: #d97706;
            --accent-cool: #059669;
            --text-dark: #1f2937;
            --text-medium: #4b5563;
            --text-light: #9ca3af;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --border-color: #e5e7eb;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            --radius-sm: 0.375rem;
            --radius-md: 0.5rem;
            --radius-lg: 0.75rem;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        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);
            overflow-x: hidden;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-medium));
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-md);
        }
        .header-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Georgia', serif;
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            transition: var(--transition);
        }
        .my-logo:hover {
            color: var(--accent-warm);
            transform: translateY(-2px);
        }
        .my-logo i {
            color: var(--accent-warm);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-link {
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: white;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-warm);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .mobile-nav-toggle {
                display: block;
            }
        }
        .mobile-nav {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background: var(--primary-dark);
            padding: 1rem;
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
            box-shadow: var(--shadow-lg);
        }
        .mobile-nav.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .mobile-nav .nav-link {
            display: block;
            padding: 0.75rem 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background: var(--bg-white);
            padding: 1rem 1.5rem;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            list-style: none;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .breadcrumb a {
            color: var(--primary-medium);
            text-decoration: none;
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--accent-warm);
            text-decoration: underline;
        }
        .breadcrumb .separator {
            color: var(--text-light);
        }
        .main-container {
            max-width: 1280px;
            margin: 2rem auto;
            padding: 0 1.5rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
        }
        @media (max-width: 1024px) {
            .main-container {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 2.5rem;
            box-shadow: var(--shadow-sm);
        }
        h1 {
            font-size: 2.5rem;
            line-height: 1.2;
            color: var(--primary-dark);
            margin-bottom: 1.5rem;
            border-bottom: 3px solid var(--accent-warm);
            padding-bottom: 0.5rem;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
        }
        h2 {
            font-size: 1.8rem;
            color: var(--primary-medium);
            margin: 2.5rem 0 1rem 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--border-color);
        }
        h3 {
            font-size: 1.4rem;
            color: var(--text-dark);
            margin: 2rem 0 1rem 0;
        }
        h4 {
            font-size: 1.1rem;
            color: var(--text-medium);
            margin: 1.5rem 0 0.75rem 0;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-medium);
            font-size: 0.9rem;
        }
        .last-updated {
            background: var(--accent-cool);
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: var(--radius-sm);
            font-weight: 500;
        }
        .lead-paragraph {
            font-size: 1.2rem;
            line-height: 1.8;
            color: var(--primary-medium);
            margin-bottom: 2rem;
            padding: 1.5rem;
            background: linear-gradient(to right, rgba(74, 111, 165, 0.1), transparent);
            border-left: 4px solid var(--primary-light);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight-box {
            background: linear-gradient(135deg, #fef3c7, #fde68a);
            border-left: 4px solid var(--accent-warm);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
        }
        .highlight-box h3 {
            color: #92400e;
            margin-top: 0;
        }
        .strategy-tip {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            background: var(--bg-light);
            padding: 1.5rem;
            border-radius: var(--radius-md);
            margin: 1.5rem 0;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .strategy-tip:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .tip-icon {
            color: var(--accent-cool);
            font-size: 1.5rem;
            flex-shrink: 0;
            margin-top: 0.25rem;
        }
        .content-image {
            width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            margin: 2rem 0;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
        }
        .content-image:hover {
            transform: scale(1.01);
            box-shadow: var(--shadow-lg);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--text-medium);
            margin-top: -1.5rem;
            margin-bottom: 2rem;
            font-size: 0.9rem;
        }
        .internal-link {
            color: var(--accent-cool);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border-bottom: 1px dashed currentColor;
        }
        .internal-link:hover {
            color: var(--primary-dark);
            border-bottom-style: solid;
        }
        .key-term {
            background: linear-gradient(120deg, rgba(217, 119, 6, 0.1) 0%, rgba(217, 119, 6, 0.05) 100%);
            padding: 0.2rem 0.5rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            color: var(--accent-warm);
        }
        .interactive-features {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 2rem;
            margin: 2.5rem 0;
            box-shadow: var(--shadow-md);
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        .feature-card {
            background: var(--bg-light);
            padding: 1.5rem;
            border-radius: var(--radius-md);
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .feature-card h3 {
            margin-top: 0;
            color: var(--primary-medium);
        }
        .feature-card i {
            font-size: 2rem;
            color: var(--accent-cool);
            margin-bottom: 1rem;
        }
        .search-form, .comment-form, .rating-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .form-group label {
            font-weight: 600;
            color: var(--text-dark);
        }
        input, select, textarea {
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 0.25rem;
            font-size: 1.5rem;
            color: #e5e7eb;
            cursor: pointer;
        }
        .rating-stars:hover .star {
            color: #fbbf24;
        }
        .rating-stars .star:hover,
        .rating-stars .star:hover ~ .star {
            color: #fbbf24;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars input:checked + label ~ .star {
            color: #e5e7eb;
        }
        .rating-stars input:checked + label {
            color: #f59e0b;
        }
        .btn {
            padding: 0.75rem 1.5rem;
            background: linear-gradient(135deg, var(--primary-medium), var(--primary-dark));
            color: white;
            border: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }
        .btn:hover {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-medium));
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-accent {
            background: linear-gradient(135deg, var(--accent-warm), #b45309);
        }
        .btn-accent:hover {
            background: linear-gradient(135deg, #b45309, var(--accent-warm));
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        @media (max-width: 1024px) {
            .sidebar {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            }
        }
        .sidebar-widget {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            box-shadow: var(--shadow-sm);
        }
        .widget-title {
            font-size: 1.2rem;
            color: var(--primary-dark);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-warm);
        }
        .resource-list {
            list-style: none;
        }
        .resource-list li {
            margin-bottom: 0.75rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid var(--border-color);
        }
        .resource-list a {
            color: var(--text-dark);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            transition: var(--transition);
        }
        .resource-list a:hover {
            color: var(--primary-medium);
            transform: translateX(4px);
        }
        .resource-list i {
            color: var(--accent-cool);
        }
        .tier-list {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .tier-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 0.75rem;
            background: var(--bg-light);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .tier-item:hover {
            background: #e0f2fe;
        }
        .tier-rank {
            width: 2rem;
            height: 2rem;
            background: var(--primary-dark);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            flex-shrink: 0;
        }
        .tier-rank.s-tier { background: #dc2626; }
        .tier-rank.a-tier { background: #ea580c; }
        .tier-rank.b-tier { background: #d97706; }
        .tier-rank.c-tier { background: #059669; }
        .site-footer {
            background: var(--primary-dark);
            color: white;
            padding: 3rem 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            border-bottom: 2px solid var(--accent-warm);
            padding-bottom: 0.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-links a:hover {
            color: var(--accent-warm);
            transform: translateX(4px);
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 1rem;
            background: rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }
        friend-link a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
        }
        .text-center { text-align: center; }
        .mt-1 { margin-top: 1rem; }
        .mt-2 { margin-top: 2rem; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .py-1 { padding-top: 1rem; padding-bottom: 1rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }
        .emoji { font-size: 1.2em; margin-right: 0.25rem; }
        .strong { font-weight: 700; color: var(--primary-dark); }
        .separator-line {
            height: 1px;
            background: linear-gradient(to right, transparent, var(--border-color), transparent);
            margin: 2rem 0;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }