* { 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: #f8f9fa; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        a { text-decoration: none; color: #2c8cff; transition: all 0.3s; }
        a:hover { color: #1a5fb4; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        header { background: linear-gradient(135deg, #1a365d, #2d3748); color: white; padding: 15px 0; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
        .header-top { display: flex; justify-content: space-between; align-items: center; }
        .logo a { font-size: 2.2rem; font-weight: 800; color: #63b3ed; font-family: 'Georgia', serif; letter-spacing: 1px; }
        .logo a:hover { color: #90cdf4; }
        .desktop-nav { display: flex; gap: 30px; list-style: none; }
        .desktop-nav a { color: #e2e8f0; font-weight: 500; padding: 8px 12px; border-radius: 4px; }
        .desktop-nav a:hover { background: rgba(255,255,255,0.1); text-decoration: none; }
        .hamburger { display: none; background: none; border: none; color: white; font-size: 1.8rem; cursor: pointer; }
        .mobile-nav { display: none; flex-direction: column; background: #2d3748; padding: 20px; border-radius: 8px; margin-top: 15px; list-style: none; }
        .mobile-nav.active { display: flex; }
        .mobile-nav a { color: #e2e8f0; padding: 12px; border-bottom: 1px solid #4a5568; }
        .breadcrumb { padding: 15px 0; background: #edf2f7; font-size: 0.95rem; }
        .breadcrumb ol { display: flex; list-style: none; gap: 10px; }
        .breadcrumb li:not(:last-child)::after { content: '›'; margin-left: 10px; color: #718096; }
        main { padding: 30px 0; background: white; box-shadow: 0 0 20px rgba(0,0,0,0.05); }
        article { max-width: 900px; margin: 0 auto; padding: 0 20px; }
        h1 { font-size: 2.8rem; color: #1a365d; margin-bottom: 20px; line-height: 1.2; border-left: 6px solid #2c8cff; padding-left: 15px; }
        h2 { font-size: 2.2rem; color: #2d3748; margin: 35px 0 15px; padding-bottom: 8px; border-bottom: 2px solid #e2e8f0; }
        h3 { font-size: 1.7rem; color: #4a5568; margin: 25px 0 10px; }
        h4 { font-size: 1.4rem; color: #718096; margin: 20px 0 10px; }
        p { margin-bottom: 18px; text-align: justify; }
        strong { color: #2d3748; font-weight: 700; }
        .highlight { background: #fffacd; padding: 15px; border-left: 5px solid #f6ad55; margin: 20px 0; border-radius: 0 8px 8px 0; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .last-updated { font-style: italic; color: #718096; margin-bottom: 25px; }
        .image-wrapper { text-align: center; margin: 30px 0; }
        .image-wrapper img { border-radius: 10px; box-shadow: 0 8px 20px rgba(0,0,0,0.1); border: 1px solid #e2e8f0; }
        .image-caption { font-size: 0.9rem; color: #718096; margin-top: 8px; }
        .functions { background: #f7fafc; padding: 30px; border-radius: 12px; margin: 40px 0; border: 1px solid #e2e8f0; }
        .function-box { margin-bottom: 25px; }
        .function-box h3 { color: #2c8cff; display: flex; align-items: center; gap: 10px; }
        input, textarea, select { width: 100%; padding: 12px 15px; margin: 8px 0; border: 1px solid #cbd5e0; border-radius: 6px; font-size: 1rem; transition: border 0.3s; }
        input:focus, textarea:focus, select:focus { outline: none; border-color: #2c8cff; box-shadow: 0 0 0 3px rgba(44,140,255,0.2); }
        button { background: #2c8cff; color: white; border: none; padding: 12px 25px; border-radius: 6px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background 0.3s; }
        button:hover { background: #1a5fb4; }
        footer { background: #1a365d; color: #e2e8f0; padding: 40px 0 20px; }
        friend-link { display: block; margin: 25px 0; }
        friend-link a { color: #90cdf4; margin: 0 15px; font-weight: 500; }
        .copyright { margin-top: 30px; padding-top: 20px; border-top: 1px solid #4a5568; font-size: 0.9rem; color: #a0aec0; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .functions { padding: 20px; }
            .container { padding: 0 15px; }
        }
        .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin: 25px 0; }
        .stat-card { background: #edf2f7; padding: 20px; border-radius: 8px; text-align: center; }
        .link-list { display: flex; flex-wrap: wrap; gap: 15px; margin: 20px 0; }
        .link-list a { background: #f7fafc; padding: 10px 18px; border-radius: 6px; border: 1px solid #e2e8f0; }
        .link-list a:hover { background: #e2e8f0; }