* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary-dark: #1a365d;
            --primary-light: #2d74da;
            --accent-spy: #e53e3e; 
            --accent-field: #38a169; 
            --neutral-light: #f7fafc;
            --neutral-mid: #e2e8f0;
            --neutral-dark: #2d3748;
            --text-primary: #2d3748;
            --text-secondary: #4a5568;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--neutral-light);
            color: var(--text-primary);
            line-height: 1.7;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-spy);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
        .py-4 { padding-top: 2rem; padding-bottom: 2rem; }
        .py-8 { padding-top: 4rem; padding-bottom: 4rem; }
        .mb-2 { margin-bottom: 0.5rem; }
        .mb-4 { margin-bottom: 2rem; }
        .mb-6 { margin-bottom: 3rem; }
        .text-center { text-align: center; }
        .highlight {
            background: linear-gradient(120deg, #a0e7ff 0%, #a0e7ff 100%);
            background-repeat: no-repeat;
            background-size: 100% 0.4em;
            background-position: 0 88%;
            font-weight: 700;
        }
        .btn {
            display: inline-block;
            padding: 12px 24px;
            background-color: var(--primary-light);
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: var(--primary-dark);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        header {
            background-color: var(--primary-dark);
            color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 20px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 900;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent-spy);
        }
        .my-logo:hover {
            text-decoration: none;
            color: white;
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            color: var(--neutral-mid);
            font-weight: 500;
        }
        .desktop-nav a:hover {
            color: white;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: var(--neutral-dark);
            padding: 1rem;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav ul {
            list-style: none;
        }
        .mobile-nav li {
            padding: 0.8rem 0;
            border-bottom: 1px solid var(--neutral-mid);
        }
        .mobile-nav a {
            color: white;
            display: block;
        }
        .breadcrumb {
            background-color: var(--neutral-mid);
            padding: 0.8rem 20px;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb span {
            color: var(--text-primary);
        }
        main {
            flex: 1;
        }
        .article-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
            color: white;
            padding: 4rem 20px;
            margin-bottom: 3rem;
        }
        .article-header h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .meta-info {
            display: flex;
            gap: 2rem;
            font-size: 0.9rem;
            opacity: 0.9;
        }
        .meta-info i {
            margin-right: 5px;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding-bottom: 4rem;
        }
        .sidebar {
            background-color: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            color: var(--primary-dark);
            border-bottom: 3px solid var(--accent-spy);
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .toc ul {
            list-style: none;
            padding-left: 0;
        }
        .toc li {
            margin-bottom: 0.8rem;
            padding-left: 1rem;
            position: relative;
        }
        .toc li:before {
            content: '🔍';
            position: absolute;
            left: 0;
        }
        .toc a {
            color: var(--text-secondary);
        }
        .interaction-box {
            margin-top: 2rem;
            padding: 1.5rem;
            background-color: var(--neutral-light);
            border-radius: 8px;
        }
        .interaction-box h4 {
            margin-bottom: 1rem;
            color: var(--primary-dark);
        }
        .interaction-box input,
        .interaction-box textarea,
        .interaction-box select {
            width: 100%;
            padding: 10px;
            margin-bottom: 1rem;
            border: 1px solid var(--neutral-mid);
            border-radius: 4px;
        }
        .rating {
            display: flex;
            gap: 5px;
            margin-bottom: 1rem;
            justify-content: center;
        }
        .rating i {
            color: var(--neutral-mid);
            cursor: pointer;
            font-size: 1.5rem;
            transition: var(--transition);
        }
        .rating i.active,
        .rating i:hover {
            color: #fbbf24;
        }
        .article-content {
            background-color: white;
            padding: 3rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .article-content h2 {
            color: var(--primary-dark);
            font-size: 2rem;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--neutral-mid);
        }
        .article-content h3 {
            color: var(--primary-dark);
            font-size: 1.5rem;
            margin: 2rem 0 1rem;
        }
        .article-content h4 {
            color: var(--text-secondary);
            font-size: 1.2rem;
            margin: 1.5rem 0 0.8rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-content ul, .article-content ol {
            margin-bottom: 1.5rem;
            padding-left: 2rem;
        }
        .article-content li {
            margin-bottom: 0.5rem;
        }
        .image-block {
            margin: 2rem 0;
            text-align: center;
        }
        .image-block figcaption {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 0.5rem;
            font-style: italic;
        }
        .strategy-box, .interview-box, .data-box {
            background-color: var(--neutral-light);
            border-left: 4px solid var(--accent-spy);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .data-box {
            border-left-color: var(--accent-field);
        }
        .interview-box {
            border-left-color: #9f7aea;
        }
        blockquote {
            font-style: italic;
            color: var(--text-secondary);
            border-left: 4px solid var(--primary-light);
            padding-left: 1.5rem;
            margin: 2rem 0;
        }
        .related-links {
            background-color: var(--neutral-light);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .related-links ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            list-style: none;
            padding-left: 0;
        }
        .related-links li:before {
            content: '➡️';
            margin-right: 8px;
        }
        .search-bar {
            margin: 2rem 0;
            display: flex;
        }
        .search-bar input {
            flex: 1;
            padding: 12px 15px;
            border: 2px solid var(--neutral-mid);
            border-radius: 6px 0 0 6px;
            font-size: 1rem;
        }
        .search-bar button {
            background-color: var(--primary-dark);
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 6px 6px 0;
            cursor: pointer;
            font-weight: 600;
        }
        footer {
            background-color: var(--primary-dark);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-section ul {
            list-style: none;
        }
        .footer-section li {
            margin-bottom: 0.8rem;
        }
        .footer-section a {
            color: var(--neutral-mid);
        }
        .footer-section a:hover {
            color: white;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 1rem;
            background-color: rgba(255,255,255,0.1);
            border-radius: 6px;
            text-align: center;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: var(--neutral-mid);
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            .article-content {
                padding: 2rem;
            }
            .content-wrapper {
                padding: 0 15px 3rem;
            }
            .meta-info {
                flex-direction: column;
                gap: 0.5rem;
            }
        }