:root {
            --bg-main: #0b0f19;
            --bg-card: #131a26;
            --primary: #10b981;
            --primary-glow: rgba(16, 185, 129, 0.15);
            --text-pure: #ffffff;
            --text-muted: #9ca3af;
            --text-dark: #6b7280;
            --border: #1f2937;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-main);
            color: var(--text-pure);
            line-height: 1.7;
            letter-spacing: -0.01em;
            -webkit-font-smoothing: antialiased;
        }
        header {
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            background: rgba(11, 15, 25, 0.8);
            backdrop-filter: blur(12px);
            z-index: 100;
        }
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            text-decoration: none;
            gap: 0.75rem;
        }
        .logo-img {
            width: 28px;
            height: 28px;
            object-fit: contain;
        }
        .logo-text {
            font-size: 1.1rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            color: var(--text-pure);
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 2.5rem;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--text-muted);
            margin-left: 2rem;
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.2s;
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
        }
        .github-icon-link {
            color: var(--text-muted);
            transition: color 0.2s;
            display: flex;
            align-items: center;
        }
        .github-icon-link:hover {
            color: var(--text-pure);
        }

        /* Long Article Container */
        .article-layout-wrapper {
            max-width: 1200px;
            margin: 0 auto;
            padding: 4rem 2rem 8rem;
            display: grid;
            grid-template-columns: 1fr 280px;
            gap: 4rem;
        }
        .article-main-body {
            min-width: 0;
        }
        .article-header {
            margin-bottom: 3.5rem;
            border-bottom: 1px solid var(--border);
            padding-bottom: 2rem;
        }
        .article-header h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.03em;
            margin-bottom: 1rem;
            background: linear-gradient(to bottom right, #ffffff 40%, #9ca3af);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .article-meta-info {
            display: flex;
            gap: 1.5rem;
            color: var(--text-dark);
            font-size: 0.9rem;
            font-family: monospace;
        }
        .article-meta-info span strong {
            color: var(--text-muted);
        }

        /* Typography & Technical Content Styling */
        .article-main-body h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin: 3.5rem 0 1.25rem;
            padding-bottom: 0.5rem;
            color: var(--text-pure);
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .article-main-body h2::before {
            content: "";
            width: 4px;
            height: 1.2rem;
            background-color: var(--primary);
            border-radius: 2px;
            display: inline-block;
        }
        .article-main-body h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 2rem 0 1rem;
            color: #e5e7eb;
        }
        .article-main-body p {
            color: #d1d5db;
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-main-body ul, .article-main-body ol {
            margin-bottom: 1.5rem;
            padding-left: 1.5rem;
            color: #d1d5db;
        }
        .article-main-body li {
            margin-bottom: 0.5rem;
        }

        /* Tech Callout Box */
        .tech-callout-panel {
            background-color: rgba(19, 26, 38, 0.4);
            border-left: 3px solid var(--primary);
            border-top: 1px solid var(--border);
            border-right: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin: 2rem 0;
        }
        .tech-callout-panel h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary);
        }
        .tech-callout-panel p {
            margin-bottom: 0;
            font-size: 0.95rem;
            color: var(--text-muted);
        }

        /* Code Block Mock Style */
        pre {
            background-color: #070a10;
            border: 1px solid var(--border);
            padding: 1.5rem;
            border-radius: 8px;
            font-family: "Fira Code", Consolas, Monaco, monospace;
            font-size: 0.88rem;
            color: #34d399;
            overflow-x: auto;
            margin: 1.5rem 0;
        }

        /* Formal Multimedia Image Slots Styles */
        .guide-image-container {
            width: 100%;
            margin: 2.5rem 0;
            background-color: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            position: relative;
        }
        .guide-image-container .aspect-ratio-holder {
            width: 100%;
            padding-bottom: 50%; /* 2:1 Wide Layout */
            height: 0;
            position: relative;
        }
        .guide-image-container img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        /* Sidebar Navigation */
        .aside-toc-sticky {
            position: sticky;
            top: 7rem;
            height: fit-content;
        }
        .toc-title {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-dark);
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .toc-list {
            list-style: none;
            border-left: 1px solid var(--border);
            padding-left: 1rem;
        }
        .toc-item {
            margin-bottom: 0.85rem;
        }
        .toc-item a {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: color 0.2s;
            display: block;
        }
        .toc-item a:hover, .toc-item.active a {
            color: var(--primary);
        }

        footer {
            border-top: 1px solid var(--border);
            background-color: #070a10;
            color: var(--text-dark);
            padding: 5rem 2rem 3rem;
            font-size: 0.9rem;
        }
        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr repeat(3, 1fr);
            gap: 4rem;
            padding-bottom: 4rem;
        }
        .footer-brand h4 {
            color: var(--text-pure);
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }
        .footer-brand p {
            max-width: 260px;
            line-height: 1.6;
        }
        .footer-links h5 {
            color: var(--text-muted);
            margin-bottom: 1.2rem;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links ul li {
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.2s;
        }
        .footer-links a:hover {
            color: var(--text-pure);
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.02);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        @media (max-width: 968px) {
            .article-layout-wrapper {
                grid-template-columns: 1fr;
            }
            .aside-toc-sticky {
                display: none;
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
                gap: 2.5rem;
            }
        }
        @media (max-width: 768px) {
            .nav-container {
                padding: 1rem;
            }
            .nav-links {
                display: none;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }