:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #60a5fa;
            --bg-page: #f3f4f6;
            --bg-card: #ffffff;
            --bg-alt: #f9fafb;
            --text-main: #111827;
            --text-secondary: #6b7280;
            --text-light: #9ca3af;
            --border: #e5e7eb;
            --border-light: #f3f4f6;
            --radius: 12px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
            background: var(--bg-page);
            color: var(--text-main);
            line-height: 1.8;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        .container {
            width: min(1000px, calc(100% - 32px));
            margin: 0 auto;
        }

        .header {
            background: var(--bg-card);
            border-bottom: 1px solid var(--border);
            padding: 14px 0;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
        }

        .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
        }

        .nav {
            display: flex;
            gap: 24px;
            font-size: 14px;
        }

        .nav a {
            color: var(--text-secondary);
            transition: color 0.2s;
        }

        .nav a:hover {
            color: var(--primary);
        }

        .breadcrumb {
            padding: 14px 0;
            font-size: 13px;
            color: var(--text-light);
            background: var(--bg-page);
        }

        .breadcrumb a {
            color: var(--text-secondary);
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb span {
            margin: 0 6px;
            color: var(--text-light);
        }

        .main-content {
            background: var(--bg-card);
            margin-top: 20px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .article-header {
            padding: 28px 32px;
            border-bottom: 1px solid var(--border-light);
        }

        .article-title {
            font-size: clamp(24px, 4vw, 32px);
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 16px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .article-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .article-meta .source {
            color: var(--primary);
            font-weight: 600;
        }

        .article-body {
            padding: 28px 32px;
            font-size: 16px;
            color: var(--text-main);
            line-height: 2;
        }

        .article-body p {
            margin-bottom: 1.6em;
        }

        .article-body h2 {
            font-size: 20px;
            font-weight: 700;
            margin: 2.5em 0 1.2em;
            color: var(--text-main);
            padding-left: 12px;
            border-left: 3px solid var(--primary);
        }

        .article-body h3 {
            font-size: 18px;
            font-weight: 600;
            margin: 2em 0 1em;
            color: var(--text-main);
        }

        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 1.5em 0;
        }

        .article-body blockquote {
            margin: 1.5em 0;
            padding: 16px 20px;
            background: var(--bg-alt);
            border-left: 4px solid var(--primary);
            color: var(--text-secondary);
            font-style: italic;
            quotes: none;
        }

        .article-body blockquote::before,
        .article-body blockquote::after {
            content: "";
        }

        .article-body strong {
            color: var(--text-main);
            font-weight: 700;
        }

        .product-list {
            list-style: none;
            padding: 0 32px;
            margin-bottom: 28px;
        }

        .product-item {
            display: flex;
            gap: 20px;
            padding: 24px 0;
            border-bottom: 1px dashed var(--border-light);
        }

        .product-item:last-child {
            border-bottom: 0;
        }

        .product-num {
            width: 28px;
            height: 28px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 700;
            flex-shrink: 0;
            margin-top: 4px;
        }

        .product-content {
            flex: 1;
        }

        .product-name {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .product-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .product-image {
            width: 120px;
            height: 120px;
            border-radius: 10px;
            overflow: hidden;
            flex-shrink: 0;
            background: var(--bg-alt);
        }

        .product-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .download-buttons {
            display: flex;
            gap: 12px;
            margin-top: 16px;
        }

        .btn-download {
            padding: 8px 20px;
            background: var(--primary);
            color: #fff;
            border-radius: 8px;
            font-size: 13px;
            font-weight: 600;
            transition: background 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .btn-download:hover {
            background: var(--primary-dark);
        }

        .btn-download-secure {
            padding: 8px 20px;
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text-secondary);
            border-radius: 8px;
            font-size: 13px;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .btn-download-secure:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        .action-box {
            margin: 32px 32px;
            padding: 24px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(96, 165, 250, 0.04));
            border: 1px solid rgba(37, 99, 235, 0.1);
            border-radius: var(--radius);
            text-align: center;
        }

        .action-box h3 {
            font-size: 18px;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .action-box p {
            color: var(--text-secondary);
            margin-bottom: 16px;
            font-size: 14px;
        }

        .btn-action {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 32px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            border-radius: 8px;
            box-shadow: 0 6px 18px rgba(37, 99, 235, 0.3);
            transition: all 0.3s ease;
        }

        .btn-action:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
        }

        .related-section {
            padding: 28px 32px;
            background: var(--bg-alt);
            border-top: 1px solid var(--border-light);
        }

        .related-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--text-main);
        }

        .related-list {
            list-style: none;
        }

        .related-list li {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
        }

        .related-list li:last-child {
            border-bottom: 0;
        }

        .related-list a {
            font-size: 15px;
            color: var(--text-main);
            line-height: 1.5;
            transition: color 0.2s;
            flex: 1;
        }

        .related-list a:hover {
            color: var(--primary);
        }

        .related-list .date {
            font-size: 13px;
            color: var(--text-light);
            flex-shrink: 0;
            margin-left: 16px;
        }

        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .widget {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 20px;
        }

        .widget-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
        }

        .tags-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tags-list a {
            padding: 6px 12px;
            background: var(--bg-alt);
            border-radius: 6px;
            font-size: 13px;
            color: var(--text-secondary);
            transition: all 0.2s;
        }

        .tags-list a:hover {
            background: var(--primary);
            color: #fff;
        }

        .recommend-list {
            list-style: none;
        }

        .recommend-list li {
            padding: 10px 0;
            border-bottom: 1px dashed var(--border);
        }

        .recommend-list li:last-child {
            border-bottom: 0;
            padding-bottom: 0;
        }

        .recommend-list a {
            display: block;
            font-size: 14px;
            color: var(--text-main);
            line-height: 1.5;
            transition: color 0.2s;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .recommend-list a:hover {
            color: var(--primary);
        }

        .footer {
            background: #1f2937;
            color: #9ca3af;
            padding: 32px 0;
            margin-top: 32px;
            text-align: center;
            font-size: 14px;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 12px;
        }

        .footer-links a {
            color: #9ca3af;
            transition: color 0.2s;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .layout-grid {
            display: grid;
            grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
            gap: 24px;
            margin-bottom: 32px;
        }

        .sidebar {
            position: sticky;
            top: 80px;
            align-self: start;
        }

        @media (max-width: 768px) {
            .layout-grid {
                grid-template-columns: 1fr;
            }
            
            .article-header,
            .article-body {
                padding: 20px;
            }
            
            .product-list {
                padding: 0 20px;
            }
            
            .product-item {
                flex-direction: column;
            }
            
            .product-image {
                width: 100%;
                height: auto;
            }
            
            .download-buttons {
                flex-wrap: wrap;
            }
            
            .action-box {
                margin: 20px;
            }
            
            .related-section {
                padding: 20px;
            }
            
            .nav {
                display: none;
            }
        }