* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #6a11cb; text-decoration: none; transition: all 0.3s ease; }
        a:hover { color: #ff6b8b; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-weight: 800; line-height: 1.2; margin-bottom: 1rem; color: #2d3748; }
        h1 { font-size: clamp(2.5rem, 5vw, 3.8rem); margin-top: 1.5rem; }
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); border-left: 5px solid #6a11cb; padding-left: 1rem; margin-top: 2.5rem; }
        h3 { font-size: clamp(1.4rem, 3vw, 1.8rem); color: #4a5568; margin-top: 2rem; }
        h4 { font-size: 1.2rem; color: #718096; margin-top: 1.5rem; }
        p { margin-bottom: 1.5rem; font-size: 1.05rem; }
        .lead { font-size: 1.3rem; font-weight: 300; color: #4a5568; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        em { color: #805ad5; }
        strong { color: #2d3748; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        main { flex: 1; }
        .site-header {
            background: linear-gradient(90deg, #1a202c 0%, #2d3748 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 900;
            color: #ff6b8b;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover { color: #fff; text-decoration: none; }
        .my-logo i { font-size: 2rem; }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #edf2f7;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: #a0aec0;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .main-nav a {
            color: #cbd5e0;
            font-weight: 600;
            padding: 0.5rem 0;
        }
        .main-nav a:hover, .main-nav a.active {
            color: #ff6b8b;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .featured-image {
            margin: 2rem 0;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(106, 17, 203, 0.2);
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 0.8rem;
            background-color: #f8f9fa;
            color: #718096;
        }
        .article-content {
            background-color: white;
            padding: 2.5rem;
            border-radius: 16px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.06);
            margin-bottom: 2.5rem;
        }
        .section-divider {
            height: 2px;
            background: linear-gradient(to right, transparent, #6a11cb, transparent);
            margin: 3rem 0;
        }
        .interactive-box {
            background: #f8f9ff;
            border-left: 4px solid #6a11cb;
            padding: 1.8rem;
            margin: 2.5rem 0;
            border-radius: 0 12px 12px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.03);
        }
        .interactive-box h3 { margin-top: 0; }
        .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 1rem;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #6a11cb;
            box-shadow: 0 0 0 3px rgba(106, 17, 203, 0.2);
        }
        .btn {
            display: inline-block;
            background: linear-gradient(90deg, #6a11cb 0%, #2575fc 100%);
            color: white;
            padding: 0.9rem 2rem;
            border: none;
            border-radius: 8px;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(106, 17, 203, 0.4);
            text-decoration: none;
            color: white;
        }
        .stars {
            display: flex;
            gap: 5px;
            margin: 0.8rem 0;
        }
        .star {
            font-size: 1.5rem;
            color: #e2e8f0;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star.active, .star:hover {
            color: #ffd700;
        }
        .related-links {
            background-color: #f1f8ff;
            padding: 1.5rem;
            border-radius: 12px;
            margin: 2rem 0;
        }
        .related-links ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            list-style: none;
        }
        .related-links li:before {
            content: '🔗';
            margin-right: 10px;
        }
        .site-footer {
            background: #1a202c;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #ff6b8b;
            margin-bottom: 1.2rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
            padding: 0.5rem;
            background-color: #2d3748;
            border-radius: 6px;
            transition: background-color 0.3s;
        }
        friend-link:hover {
            background-color: #4a5568;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 80%;
                height: calc(100vh - 70px);
                background: #2d3748;
                transition: left 0.3s ease;
                padding: 2rem;
                box-shadow: 5px 0 15px rgba(0,0,0,0.2);
            }
            .main-nav.active { left: 0; }
            .main-nav ul {
                flex-direction: column;
                gap: 1rem;
            }
            .header-container { flex-wrap: wrap; }
            .article-content { padding: 1.5rem; }
            h1 { font-size: 2.2rem; }
        }