* { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.8; color: #222; background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%); min-height: 100vh; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }
        header { background: #1a237e; color: #fff; padding: 1rem 0; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
        .header-content { display: flex; justify-content: space-between; align-items: center; }
        .logo a { font-size: 2rem; font-weight: 800; letter-spacing: 1px; }
        .my-logo { color: #00e5ff; font-style: italic; text-shadow: 0 0 10px rgba(0,229,255,0.7); }
        nav ul { display: flex; gap: 2rem; }
        nav a { padding: 0.5rem 1rem; border-radius: 20px; transition: all 0.3s ease; font-weight: 600; }
        nav a:hover { background: #00e5ff; color: #1a237e; transform: translateY(-3px); }
        .hamburger { display: none; background: none; border: none; color: #fff; font-size: 1.8rem; cursor: pointer; }
        .breadcrumb { padding: 1rem 0; background: #e8eaf6; color: #1a237e; font-size: 0.9rem; }
        .breadcrumb a { color: #3949ab; }
        .breadcrumb a:hover { text-decoration: underline; }
        main { padding: 2rem 0; }
        article { background: #fff; padding: 3rem; border-radius: 20px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); margin-bottom: 2rem; }
        h1 { font-size: 3.2rem; color: #1a237e; margin-bottom: 1.5rem; text-align: center; border-bottom: 4px solid #00e5ff; padding-bottom: 1rem; }
        h2 { font-size: 2.5rem; color: #3949ab; margin-top: 3rem; margin-bottom: 1.2rem; padding-left: 1rem; border-left: 6px solid #00e5ff; }
        h3 { font-size: 1.8rem; color: #5c6bc0; margin-top: 2rem; margin-bottom: 1rem; }
        h4 { font-size: 1.4rem; color: #7986cb; margin-top: 1.5rem; margin-bottom: 0.8rem; }
        p { margin-bottom: 1.5rem; text-align: justify; font-size: 1.1rem; }
        strong { color: #d50000; font-weight: 800; }
        emoji { font-size: 1.3em; margin-right: 8px; }
        .highlight { background: #e3f2fd; padding: 1.5rem; border-radius: 10px; border-left: 5px solid #1a237e; margin: 1.5rem 0; }
        .article-img { width: 100%; max-width: 900px; height: auto; border-radius: 15px; margin: 2rem auto; display: block; box-shadow: 0 8px 20px rgba(0,0,0,0.2); }
        .update-time { text-align: right; font-style: italic; color: #666; margin-bottom: 2rem; }
        .functionality { background: #f3e5f5; padding: 2rem; border-radius: 15px; margin: 3rem 0; border: 2px dashed #7b1fa2; }
        .functionality h2 { color: #7b1fa2; border-left-color: #7b1fa2; }
        form { display: grid; gap: 1.2rem; max-width: 600px; margin: 0 auto; }
        input, textarea, select { padding: 1rem; border: 2px solid #bbdefb; border-radius: 10px; font-size: 1rem; transition: border 0.3s; }
        input:focus, textarea:focus, select:focus { border-color: #1a237e; outline: none; }
        button { padding: 1rem 2rem; background: linear-gradient(90deg, #1a237e, #3949ab); color: #fff; border: none; border-radius: 10px; font-size: 1.1rem; font-weight: bold; cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; justify-content: center; gap: 10px; }
        button:hover { background: linear-gradient(90deg, #3949ab, #00e5ff); transform: scale(1.05); }
        .internal-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1rem; margin: 2rem 0; }
        .internal-links a { background: #c8e6c9; padding: 1rem; border-radius: 10px; text-align: center; font-weight: 600; transition: all 0.3s; }
        .internal-links a:hover { background: #81c784; color: #1b5e20; transform: translateY(-5px); }
        footer { background: #1a237e; color: #fff; padding: 3rem 0; text-align: center; margin-top: 3rem; }
        .footer-content { display: flex; flex-direction: column; align-items: center; gap: 2rem; }
        friend-link { display: block; margin: 0.5rem 0; }
        friend-link a { color: #00e5ff; font-size: 1.2rem; }
        friend-link a:hover { text-decoration: underline; }
        .copyright { font-size: 0.9rem; color: #bbdefb; margin-top: 2rem; }
        @media (max-width: 768px) {
            .header-content { flex-wrap: wrap; }
            nav ul { display: none; flex-direction: column; width: 100%; background: #3949ab; position: absolute; top: 100%; left: 0; padding: 1rem; z-index: 1000; }
            nav ul.active { display: flex; }
            .hamburger { display: block; }
            h1 { font-size: 2.5rem; }
            h2 { font-size: 2rem; }
            h3 { font-size: 1.5rem; }
            article { padding: 1.5rem; }
            .internal-links { grid-template-columns: 1fr; }
        }