:root {
            --primary: #2563eb;
            --secondary: #7c3aed;
            --accent: #f59e0b;
            --dark: #1e293b;
            --light: #f8fafc;
            --gray: #64748b;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background: linear-gradient(135deg, #f0f9ff 0%, #fef2f2 100%);
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 2px solid var(--primary);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 0;
        }
        .my-logo {
            font-size: 2.4rem;
            font-weight: 900;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .nav-menu ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-menu a {
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0.2rem;
            position: relative;
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent);
            transition: width 0.3s;
        }
        .nav-menu a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--primary);
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background: var(--light);
            padding: 0.8rem 0;
            border-top: 1px solid #e2e8f0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: var(--gray);
        }
        main {
            padding: 2.5rem 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            border-radius: 20px;
            padding: 2.5rem;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
            border: 1px solid #e5e7eb;
        }
        h1 {
            font-size: 3.2rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            color: var(--dark);
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-align: center;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 2px dashed #d1d5db;
            color: var(--gray);
            font-size: 0.95rem;
        }
        .article-meta i {
            margin-right: 0.5rem;
            color: var(--accent);
        }
        .featured-img {
            width: 100%;
            height: 450px;
            object-fit: cover;
            border-radius: 15px;
            margin: 2rem 0 3rem;
            border: 5px solid white;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            transition: transform 0.5s;
        }
        .featured-img:hover {
            transform: scale(1.005);
        }
        h2 {
            font-size: 2.3rem;
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 3px solid var(--accent);
            color: var(--dark);
        }
        h3 {
            font-size: 1.8rem;
            margin: 2.5rem 0 1.2rem;
            color: var(--secondary);
        }
        h4 {
            font-size: 1.4rem;
            margin: 2rem 0 1rem;
            color: var(--primary);
        }
        p {
            margin-bottom: 1.8rem;
            text-align: justify;
            font-size: 1.1rem;
            color: #374151;
        }
        .highlight {
            background: linear-gradient(120deg, #fef3c7 0%, #fef3c7 100%);
            padding: 1.5rem;
            border-left: 5px solid var(--accent);
            border-radius: 0 10px 10px 0;
            margin: 2rem 0;
            font-style: italic;
        }
        .quote {
            font-size: 1.3rem;
            color: var(--secondary);
            font-weight: 600;
            margin: 2rem 0;
            padding-left: 1.5rem;
            border-left: 4px solid var(--primary);
        }
        .link-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .link-card {
            background: var(--light);
            padding: 1.5rem;
            border-radius: 12px;
            border: 1px solid #cbd5e1;
            transition: var(--transition);
        }
        .link-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            border-color: var(--primary);
        }
        .link-card h4 {
            margin-top: 0;
            color: var(--dark);
        }
        aside {
            background: white;
            border-radius: 20px;
            padding: 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            border: 1px solid #e5e7eb;
            align-self: start;
            position: sticky;
            top: 140px;
        }
        .search-section, .user-interaction, .toc {
            margin-bottom: 2.5rem;
        }
        .toc h3, .search-section h3, .user-interaction h3 {
            font-size: 1.5rem;
            margin-top: 0;
            color: var(--dark);
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent);
        }
        .toc ul {
            list-style: none;
            padding-left: 1rem;
        }
        .toc li {
            margin-bottom: 0.8rem;
        }
        .toc a {
            color: var(--gray);
            display: block;
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            border-left: 3px solid transparent;
        }
        .toc a:hover {
            background: #f1f5f9;
            border-left-color: var(--primary);
            color: var(--dark);
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
        }
        input, textarea, select {
            padding: 0.9rem 1.2rem;
            border: 1px solid #cbd5e1;
            border-radius: 10px;
            font-size: 1rem;
            transition: var(--transition);
            width: 100%;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
        }
        button {
            padding: 0.9rem 1.5rem;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            color: white;
            border: none;
            border-radius: 10px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.7rem;
        }
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(37, 99, 235, 0.3);
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            justify-content: center;
            margin: 1rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #d1d5db;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: var(--accent);
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 3.5rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }
        friend-link {
            display: block;
        }
        friend-link h4 {
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            color: var(--accent);
        }
        friend-link ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 0.8rem;
        }
        friend-link a {
            color: #cbd5e1;
            padding: 0.5rem 0;
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        friend-link a::before {
            content: '🔗';
            font-size: 0.9rem;
        }
        friend-link a:hover {
            color: white;
            padding-left: 0.5rem;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #475569;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
            }
            .nav-menu ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: white;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1.5rem;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
                border-radius: 0 0 15px 15px;
                z-index: 999;
            }
            .nav-menu.active ul {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 2rem;
            }
            h3 {
                font-size: 1.6rem;
            }
            article, aside {
                padding: 1.8rem;
            }
            .featured-img {
                height: 300px;
            }
            .link-list {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 2rem;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
            }
        }