:root {
            --primary-blue: #2563eb;
            --dark-blue: #1e40af;
            --accent-orange: #f97316;
            --light-bg: #f8fafc;
            --dark-text: #1e293b;
            --gray-text: #64748b;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }
        body {
            color: var(--dark-text);
            background-color: #fff;
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-blue);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent-orange);
        }
        .search-form {
            display: flex;
            max-width: 400px;
            flex-grow: 1;
            margin: 0 2rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.7rem 1rem;
            border: 2px solid var(--border-color);
            border-radius: 50px 0 0 50px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background: var(--primary-blue);
            color: white;
            border: none;
            padding: 0.7rem 1.5rem;
            border-radius: 0 50px 50px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: var(--dark-blue);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark-text);
            cursor: pointer;
        }
        .main-nav {
            background: var(--dark-blue);
        }
        .nav-list {
            display: flex;
            list-style: none;
            justify-content: center;
        }
        .nav-list li {
            position: relative;
        }
        .nav-list a {
            color: white;
            padding: 1rem 1.5rem;
            display: block;
            font-weight: 500;
        }
        .nav-list a:hover {
            background: rgba(255,255,255,0.1);
        }
        .breadcrumb {
            padding: 1rem 0;
            background: var(--light-bg);
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--gray-text);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        main {
            padding: 2rem 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .article-content {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            box-shadow: var(--shadow);
        }
        h1 {
            font-size: 2.5rem;
            color: var(--dark-blue);
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            font-size: 1.8rem;
            color: var(--dark-blue);
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--accent-orange);
        }
        h3 {
            font-size: 1.4rem;
            color: var(--primary-blue);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.1rem;
            color: var(--dark-text);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            color: var(--gray-text);
            font-weight: 500;
            margin-bottom: 2rem;
        }
        .highlight {
            background: #fef3c7;
            border-left: 4px solid var(--accent-orange);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .article-img {
            width: 100%;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
        }
        .inline-link {
            color: var(--primary-blue);
            font-weight: 600;
            border-bottom: 2px dotted var(--primary-blue);
        }
        .inline-link:hover {
            color: var(--dark-blue);
            border-bottom-style: solid;
        }
        .sidebar {
            background: white;
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
            height: fit-content;
        }
        .sidebar-widget {
            margin-bottom: 2rem;
        }
        .sidebar-widget h3 {
            font-size: 1.2rem;
            margin-bottom: 1rem;
            color: var(--dark-blue);
        }
        .link-list {
            list-style: none;
        }
        .link-list li {
            margin-bottom: 0.8rem;
        }
        .link-list a {
            display: block;
            padding: 0.8rem;
            background: var(--light-bg);
            border-radius: 6px;
            transition: all 0.3s;
        }
        .link-list a:hover {
            background: var(--primary-blue);
            color: white;
            transform: translateX(5px);
        }
        .interaction-section {
            background: var(--light-bg);
            border-radius: 10px;
            padding: 2rem;
            margin-top: 3rem;
        }
        .rating-form, .comment-form {
            margin-bottom: 2rem;
        }
        .star-rating {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
        }
        .btn {
            background: var(--primary-blue);
            color: white;
            border: none;
            padding: 0.8rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        .btn:hover {
            background: var(--dark-blue);
        }
        .site-footer {
            background: var(--dark-blue);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 1rem 0;
        }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #cbd5e1;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
            }
            .search-form {
                order: 3;
                margin: 1rem 0 0;
                max-width: 100%;
            }
            .hamburger {
                display: block;
            }
            .nav-list {
                flex-direction: column;
                display: none;
            }
            .nav-list.active {
                display: flex;
            }
            h1 {
                font-size: 2rem;
            }
            .article-content {
                padding: 1.5rem;
            }
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .key-term {
            font-weight: 800;
            color: var(--accent-orange);
        }
        .update-time {
            background: #dcfce7;
            color: #166534;
            padding: 0.5rem 1rem;
            border-radius: 50px;
            display: inline-block;
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
        }