* { margin: 0; padding: 0; box-sizing: border-box; }
        :root {
            --primary: #1a237e; 
            --secondary: #ff6f00; 
            --accent: #4caf50; 
            --light: #f5f5f5;
            --dark: #121212;
            --gray: #757575;
            --transition: all 0.3s ease;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --border-radius: 10px;
            --max-width: 1280px;
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #fff;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 { color: var(--primary); margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: 2.8rem; margin-top: 1.5rem; border-bottom: 3px solid var(--secondary); padding-bottom: 0.5rem; }
        h2 { font-size: 2.2rem; color: var(--secondary); margin-top: 2.5rem; }
        h3 { font-size: 1.8rem; margin-top: 2rem; }
        h4 { font-size: 1.4rem; margin-top: 1.5rem; color: var(--dark); }
        p { margin-bottom: 1.2rem; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--secondary); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--border-radius); }
        ul, ol { margin-left: 1.5rem; margin-bottom: 1.2rem; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background: linear-gradient(135deg, var(--primary), #283593);
            color: white;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        .btn:hover {
            background: linear-gradient(135deg, var(--secondary), #ff8f00);
            transform: translateY(-3px);
            box-shadow: 0 6px 16px rgba(255, 111, 0, 0.3);
        }
        .highlight { background-color: #fff9c4; padding: 2px 5px; border-radius: 3px; font-weight: 600; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .site-header {
            background-color: var(--primary);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i { color: var(--secondary); }
        .my-logo span { background: -webkit-linear-gradient(var(--secondary), #ffcc80); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
        }
        .main-nav a:hover {
            color: #ffcc80;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary);
            transition: var(--transition);
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f0f0f0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: var(--gray);
        }
        .breadcrumb a:hover { text-decoration: underline; }
        .search-box {
            margin: 2rem 0;
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex-grow: 1;
            padding: 15px 20px;
            border: 2px solid #ddd;
            border-radius: 50px 0 0 50px;
            font-size: 1rem;
            outline: none;
        }
        .search-input:focus { border-color: var(--primary); }
        .search-btn {
            padding: 0 30px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 0 50px 50px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .search-btn:hover { background: var(--secondary); }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2.5rem 0;
        }
        .article-body {
            font-size: 1.1rem;
            text-align: justify;
        }
        .sidebar {
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            align-self: start;
            position: sticky;
            top: 120px;
            box-shadow: var(--shadow);
        }
        .sidebar h3 { font-size: 1.5rem; margin-top: 0; }
        .featured-img {
            margin: 2.5rem auto;
            max-width: 800px;
            text-align: center;
        }
        .featured-img figcaption {
            font-style: italic;
            color: var(--gray);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .internal-link {
            color: var(--accent);
            font-weight: 600;
            border-bottom: 1px dashed var(--accent);
        }
        .internal-link:hover {
            color: var(--secondary);
            border-bottom-style: solid;
        }
        .update-time {
            font-size: 0.9rem;
            color: var(--gray);
            font-style: italic;
            margin: 2rem 0;
            padding: 1rem;
            background-color: #e8f5e9;
            border-left: 4px solid var(--accent);
        }
        .user-interaction {
            margin: 3rem 0;
            padding: 2rem;
            background: var(--light);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .comment-form, .rating-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .form-group { display: flex; flex-direction: column; }
        .form-input, .form-textarea {
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
        }
        .form-textarea { min-height: 120px; resize: vertical; }
        .stars { display: flex; gap: 5px; margin: 10px 0; }
        .star { font-size: 1.8rem; color: #ddd; cursor: pointer; transition: var(--transition); }
        .star:hover, .star.active { color: #ffc107; }
        .site-footer {
            background-color: var(--dark);
            color: #ccc;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2rem;
        }
        .footer-logo { font-size: 1.8rem; font-weight: 700; color: white; margin-bottom: 1rem; }
        .footer-links h4 { color: white; margin-bottom: 1.2rem; }
        .footer-links ul { list-style: none; margin: 0; padding: 0; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #aaa; }
        .footer-links a:hover { color: white; }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: 8px;
            margin: 10px 0;
            border-left: 4px solid var(--secondary);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #999;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
            .sidebar { position: static; }
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--primary);
                padding: 1rem;
                transform: translateY(-150%);
                opacity: 0;
                transition: transform 0.4s ease, opacity 0.3s ease;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
                z-index: 999;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 1rem;
            }
            .header-inner { padding: 0 15px; }
            .interaction-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            .btn { padding: 10px 22px; }
            .search-form { flex-direction: column; }
            .search-input { border-radius: 50px; margin-bottom: 10px; }
            .search-btn { border-radius: 50px; padding: 12px; }
        }