* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #6a11cb; text-decoration: none; transition: all 0.3s ease; }
        a:hover { color: #2575fc; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            background: linear-gradient(90deg, #1a237e, #4a148c);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Arial Black', Gadget, sans-serif;
            font-size: 2.2rem;
            font-weight: 900;
            background: linear-gradient(to right, #ff8a00, #da1b60);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-transform: uppercase;
            letter-spacing: 2px;
        }
        .my-logo a { background: none; }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .nav-desktop a:hover {
            background: rgba(255,255,255,0.15);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #4a148c;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a {
            color: white;
            padding: 0.8rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .nav-mobile a:last-child { border-bottom: none; }
        .breadcrumb {
            padding: 1rem 0;
            background: #e8eaf6;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #5c6bc0; }
        .breadcrumb span { color: #777; }
        main { flex: 1; padding: 2rem 0; }
        article {
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            padding: 3rem;
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #ff8a00;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #4a148c;
            margin: 2.5rem 0 1rem;
            padding-left: 10px;
            border-left: 5px solid #6a11cb;
        }
        h3 {
            font-size: 1.5rem;
            color: #6a11cb;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #da1b60;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.05rem;
        }
        .intro {
            font-size: 1.2rem;
            color: #555;
            background: #f3e5f5;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
            border-left: 4px solid #9c27b0;
        }
        .highlight {
            background: linear-gradient(120deg, #a1c4fd80, #c2e9fb80);
            padding: 1.5rem;
            border-radius: 10px;
            border: 2px dashed #4a148c;
            margin: 2rem 0;
        }
        .feature-img {
            width: 100%;
            max-width: 800px;
            margin: 2rem auto;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .feature-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .feature-img img:hover {
            transform: scale(1.03);
        }
        .caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
        }
        .link-card {
            background: #f8f9fa;
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 1rem;
            transition: all 0.3s;
        }
        .link-card:hover {
            background: #e3f2fd;
            border-color: #6a11cb;
            transform: translateY(-5px);
        }
        .link-card a {
            font-weight: 600;
            display: block;
            margin-bottom: 0.5rem;
        }
        .link-card p {
            font-size: 0.9rem;
            color: #666;
            margin-bottom: 0;
        }
        .interactive-section {
            background: #f8f9ff;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #c3cfe2;
        }
        .interactive-section h3 { margin-top: 0; }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #1a237e;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 2px solid #c5cae9;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            border-color: #6a11cb;
            outline: none;
        }
        button {
            background: linear-gradient(to right, #6a11cb, #2575fc);
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        button:hover {
            background: linear-gradient(to right, #5a0cb9, #1c65e0);
            box-shadow: 0 5px 15px rgba(106, 17, 203, 0.4);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating i {
            color: #ffc107;
            font-size: 1.5rem;
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating i:hover,
        .rating i.active { color: #ff9800; }
        footer {
            background: #1a237e;
            color: #e8eaf6;
            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-logo {
            font-size: 1.8rem;
            font-weight: bold;
            margin-bottom: 1rem;
            color: white;
        }
        .footer-links a {
            color: #c5cae9;
            display: block;
            margin-bottom: 0.5rem;
        }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            margin: 0.3rem;
            font-size: 0.9rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #9fa8da;
        }
        @media (max-width: 768px) {
            .header-content { flex-wrap: wrap; }
            .nav-desktop { display: none; }
            .hamburger { display: block; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.3rem; }
            article { padding: 1.5rem; }
            .related-links { grid-template-columns: 1fr; }
            .interactive-section { padding: 1.5rem; }
        }
        @media (min-width: 769px) {
            .nav-mobile { display: none !important; }
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .bold { font-weight: 800; color: #1a237e; }
        .update-time {
            background: #e1f5fe;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            display: inline-block;
            margin-bottom: 1rem;
            font-size: 0.9rem;
            color: #0277bd;
        }
        .tag {
            display: inline-block;
            background: #e3f2fd;
            color: #1565c0;
            padding: 0.3rem 0.8rem;
            border-radius: 15px;
            font-size: 0.85rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }