* { 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%, #e4edf5 100%);
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 15px;
        }
        h1 { font-size: 2.8rem; margin-bottom: 1.5rem; color: #1a365d; border-bottom: 4px solid #4f9cf9; padding-bottom: 0.5rem; }
        h2 { font-size: 2.2rem; margin: 2.5rem 0 1rem; color: #2d4a7a; border-left: 5px solid #ff9a3c; padding-left: 15px; }
        h3 { font-size: 1.8rem; margin: 2rem 0 1rem; color: #3a506b; }
        h4 { font-size: 1.4rem; margin: 1.5rem 0 0.8rem; color: #5a6c84; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; }
        a { color: #3b82f6; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #1d4ed8; text-decoration: underline; }
        strong { color: #1e3a8a; font-weight: 700; }
        em { font-style: italic; color: #555; }
        .container { display: grid; grid-template-columns: 1fr; gap: 2rem; }
        header { background: linear-gradient(90deg, #1e3a8a, #3b82f6); color: white; padding: 1.5rem; border-radius: 0 0 12px 12px; margin-bottom: 2rem; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1); }
        .header-top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
        .my-logo a { font-size: 2.2rem; font-weight: 800; color: white; text-decoration: none; display: flex; align-items: center; }
        .my-logo i { margin-right: 10px; color: #ffd166; }
        .mobile-toggle { display: none; font-size: 1.8rem; background: none; border: none; color: white; cursor: pointer; }
        nav ul { display: flex; list-style: none; gap: 1.8rem; flex-wrap: wrap; }
        nav a { color: #e0f2fe; font-weight: 600; padding: 8px 12px; border-radius: 6px; }
        nav a:hover { background: rgba(255, 255, 255, 0.15); text-decoration: none; }
        .breadcrumb { margin-top: 1rem; font-size: 0.9rem; color: #cbd5e1; }
        .breadcrumb a { color: #bfdbfe; }
        main { background: white; padding: 2.5rem; border-radius: 12px; box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06); }
        .article-meta { display: flex; justify-content: space-between; align-items: center; border-bottom: 2px dashed #e5e7eb; padding-bottom: 1rem; margin-bottom: 2rem; color: #6b7280; font-size: 0.95rem; }
        .update-time { background: #fef3c7; padding: 5px 10px; border-radius: 20px; color: #92400e; }
        .module { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 10px; padding: 1.8rem; margin: 2.5rem 0; }
        .module h3 { margin-top: 0; }
        .module form { display: grid; gap: 1rem; margin-top: 1rem; }
        .module input, .module textarea, .module select { width: 100%; padding: 12px; border: 1px solid #cbd5e1; border-radius: 6px; font-size: 1rem; }
        .module button { background: linear-gradient(90deg, #10b981, #34d399); color: white; border: none; padding: 14px 24px; border-radius: 6px; font-weight: 600; cursor: pointer; transition: transform 0.2s; }
        .module button:hover { transform: translateY(-3px); box-shadow: 0 5px 12px rgba(16, 185, 129, 0.3); }
        .rating-stars { display: flex; gap: 5px; font-size: 1.8rem; color: #fbbf24; margin: 10px 0; }
        .rating-stars i { cursor: pointer; transition: color 0.2s; }
        .rating-stars i:hover { color: #f59e0b; }
        .feature-img { width: 100%; max-height: 500px; object-fit: cover; border-radius: 10px; margin: 2rem 0; border: 5px solid #e0f2fe; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08); }
        .highlight-box { background: linear-gradient(120deg, #dbeafe, #eff6ff); border-left: 5px solid #2563eb; padding: 1.5rem; margin: 2rem 0; border-radius: 0 8px 8px 0; }
        .tip { display: inline-block; background: #fffbeb; border: 1px solid #fbbf24; color: #92400e; padding: 5px 10px; border-radius: 15px; font-size: 0.9rem; margin: 0 5px 5px 0; }
        .internal-links { background: #f0f9ff; padding: 1.5rem; border-radius: 10px; margin: 2rem 0; }
        .internal-links ul { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; list-style: none; }
        .internal-links li { padding: 8px 0; border-bottom: 1px dashed #bae6fd; }
        footer { background: #1e293b; color: #cbd5e1; padding: 3rem 1.5rem; border-radius: 12px 12px 0 0; margin-top: 3rem; }
        .footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2.5rem; }
        .footer-section h4 { color: #f8fafc; margin-bottom: 1.2rem; }
        friend-link { display: block; padding: 8px 0; border-bottom: 1px solid #334155; }
        friend-link a { color: #93c5fd; }
        .copyright { text-align: center; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid #475569; font-size: 0.9rem; color: #94a3b8; }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .header-top { flex-direction: column; align-items: flex-start; }
            .mobile-toggle { display: block; }
            nav ul { display: none; flex-direction: column; width: 100%; margin-top: 1rem; gap: 0; }
            nav ul.active { display: flex; }
            nav ul li { width: 100%; }
            nav a { display: block; padding: 12px; border-bottom: 1px solid rgba(255,255,255,0.1); }
            .article-meta { flex-direction: column; gap: 1rem; align-items: flex-start; }
            main { padding: 1.5rem; }
            .internal-links ul { grid-template-columns: 1fr; }
        }