* { margin: 0; padding: 0; box-sizing: border-box; }
        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; }
        a { color: #2c3e50; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #e74c3c; }
        .container { 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); border: 0; }
        .header { background: #2c3e50; padding: 15px 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-size: 2.2rem; font-weight: 800; color: #f1c40f; text-transform: uppercase; letter-spacing: 1px; }
        .my-logo:hover { color: #fff; }
        .nav-desktop { display: flex; gap: 25px; }
        .nav-desktop a { color: #ecf0f1; font-weight: 600; padding: 8px 16px; border-radius: 4px; }
        .nav-desktop a:hover { background: #34495e; }
        .hamburger { display: none; flex-direction: column; cursor: pointer; }
        .hamburger span { width: 30px; height: 3px; background: #f1c40f; margin: 4px; transition: 0.3s; }
        #menu-toggle { display: none; }
        .nav-mobile { display: none; flex-direction: column; background: #2c3e50; position: absolute; top: 100%; left: 0; width: 100%; padding: 20px; gap: 15px; }
        #menu-toggle:checked ~ .nav-mobile { display: flex; }
        #menu-toggle:checked + .hamburger span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
        #menu-toggle:checked + .hamburger span:nth-child(2) { opacity: 0; }
        #menu-toggle:checked + .hamburger span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }
        .breadcrumb { background: #ecf0f1; padding: 12px 0; font-size: 0.95rem; }
        .breadcrumb a { color: #7f8c8d; }
        .breadcrumb a:hover { color: #2c3e50; }
        .main-content { background: #fff; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); padding: 40px; margin: 30px auto; }
        h1 { font-size: 3rem; color: #2c3e50; margin-bottom: 20px; text-align: center; border-bottom: 3px solid #f1c40f; padding-bottom: 15px; }
        h2 { font-size: 2.2rem; color: #34495e; margin-top: 40px; margin-bottom: 20px; padding-left: 15px; border-left: 5px solid #3498db; }
        h3 { font-size: 1.8rem; color: #16a085; margin-top: 30px; margin-bottom: 15px; }
        h4 { font-size: 1.4rem; color: #8e44ad; margin-top: 25px; margin-bottom: 10px; }
        p { margin-bottom: 22px; text-align: justify; font-size: 1.1rem; }
        .highlight { background: #fffde7; padding: 15px; border-radius: 8px; border-left: 5px solid #f1c40f; margin: 25px 0; font-weight: 600; }
        .emoji { font-size: 1.2em; }
        .update-time { color: #e74c3c; font-weight: bold; }
        .feature-img { width: 100%; max-width: 800px; height: auto; border-radius: 10px; box-shadow: 0 8px 20px rgba(0,0,0,0.15); margin: 25px auto; display: block; }
        .content-link { color: #2980b9; font-weight: 600; border-bottom: 1px dashed #2980b9; }
        .content-link:hover { color: #e74c3c; border-bottom: 1px solid #e74c3c; }
        .function-box { background: #f8f9fa; border-radius: 10px; padding: 30px; margin-top: 40px; border: 1px solid #ddd; }
        .function-box h2 { border-left: 5px solid #e74c3c; }
        form { display: grid; gap: 20px; margin-top: 20px; }
        input, textarea, select { padding: 14px; border: 1px solid #bdc3c7; border-radius: 6px; font-size: 1rem; width: 100%; }
        button { padding: 14px 24px; background: #2c3e50; color: white; border: none; border-radius: 6px; font-size: 1rem; cursor: pointer; transition: background 0.3s; display: inline-flex; align-items: center; justify-content: center; gap: 10px; }
        button:hover { background: #e74c3c; }
        .footer { background: #2c3e50; color: #ecf0f1; padding: 40px 0 20px; margin-top: 50px; }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 40px; }
        friend-link { display: block; padding: 10px 0; border-bottom: 1px solid #34495e; }
        friend-link a { color: #bdc3c7; }
        friend-link a:hover { color: #f1c40f; }
        .copyright { text-align: center; padding-top: 30px; margin-top: 30px; border-top: 1px solid #34495e; font-size: 0.9rem; color: #95a5a6; }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .hamburger { display: flex; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .main-content { padding: 25px; }
        }