:root { --bg: #0f172a; --card: #1e293b; --accent: #38bdf8; --text: #f8fafc; --sub: #94a3b8; }
        * { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, sans-serif; }
        body { background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; align-items: center; }

       
        
        .nav-menu { display: flex; gap: 24px; list-style: none; align-items: center; }
        .nav-menu > li { position: relative; }
        .nav-menu a { color: var(--sub); text-decoration: none; font-size: 0.95rem; transition: color 0.2s; display: flex; align-items: center; gap: 6px; }
        .nav-menu a:hover { color: var(--accent); }

        /* Dropdown Styles */
        .dropdown { position: absolute; top: 100%; left: 0; background: var(--card); min-width: 200px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.05); box-shadow: 0 10px 25px rgba(0,0,0,0.4); padding: 10px 0; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all 0.2s ease-in-out; z-index: 20; }
        .nav-menu > li.has-dropdown:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
        .dropdown li { list-style: none; width: 100%; }
        .dropdown a { padding: 10px 20px; color: var(--sub); width: 100%; font-size: 0.9rem; }
        .dropdown a:hover { background: rgba(56, 189, 248, 0.1); color: var(--accent); }

        /* Arrow indicator for dropdown */
        .arrow { border: solid var(--sub); border-width: 0 2px 2px 0; display: inline-block; padding: 3px; transform: rotate(45deg); transition: transform 0.2s; margin-top: -2px; }
        .has-dropdown:hover .arrow { transform: rotate(-135deg); border-color: var(--accent); }

        /* Hamburger Toggle Button */
        .menu-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 6px; z-index: 10; padding: 4px; }
        .menu-toggle span { display: block; width: 26px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }

        /* Mobile Styles */
        @media (max-width: 768px) {
            .site-header { padding: 15px 20px; }
            .menu-toggle { display: flex; }
            .nav-menu { position: absolute; top: 100%; left: 0; width: 100%; background: var(--card); flex-direction: column; align-items: flex-start; gap: 0; max-height: 0; overflow: hidden; transition: max-height 0.3s ease-in-out; border-bottom: 1px solid rgba(255,255,255,0.05); box-shadow: 0 10px 25px rgba(0,0,0,0.3); z-index: 5; }
            .nav-menu.active { max-height: 500px; overflow-y: auto; }
            .nav-menu li { width: 100%; border-top: 1px solid rgba(255,255,255,0.05); }
            .nav-menu a { display: flex; justify-content: space-between; padding: 16px 24px; width: 100%; }
            
            .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; background: rgba(15, 23, 42, 0.5); max-height: 0; overflow: hidden; transition: max-height 0.3s ease-in-out; padding: 0; }
            .nav-menu li.dropdown-open .dropdown { max-height: 450px; padding: 5px 0; }
            .dropdown a { padding-left: 36px; }
            .arrow { transform: rotate(45deg); }
            .nav-menu li.dropdown-open .arrow { transform: rotate(-135deg); border-color: var(--accent); }
        }

        /* Page Content Layout */
        header { text-align: center; margin: 20px 0 30px; padding: 0 20px; }
        header h1 { font-size: 2.3rem; color: var(--accent); margin-bottom: 10px; }
        header p { color: var(--sub); font-size: 1.05rem; max-width: 750px; margin: 0 auto; line-height: 1.5; }

        .content-container { width: 100%; max-width: 900px; margin-bottom: 60px; padding: 0 20px; display: flex; flex-direction: column; gap: 30px; }
        
        /* Interactive Tool Widget */
        .tool-widget { background: var(--card); border-radius: 20px; padding: 35px; border: 2px solid var(--accent); box-shadow: 0 10px 30px rgba(56, 189, 248, 0.15); text-align: center; }
        .tool-widget h2 { font-size: 1.6rem; color: var(--accent); margin-bottom: 10px; }
        .tool-widget p { color: var(--sub); margin-bottom: 25px; font-size: 0.95rem; }
        
        .selector-group { display: flex; justify-content: center; gap: 12px; margin-bottom: 25px; flex-wrap: wrap; }
        .variant-btn { background: #0f172a; border: 1px solid rgba(255,255,255,0.1); color: var(--sub); padding: 10px 18px; border-radius: 8px; cursor: pointer; font-size: 0.9rem; transition: all 0.2s; }
        .variant-btn.active, .variant-btn:hover { background: rgba(56, 189, 248, 0.15); border-color: var(--accent); color: var(--accent); }

        .action-btn { background: var(--accent); color: #0f172a; border: none; padding: 14px 35px; font-size: 1.05rem; font-weight: 700; border-radius: 12px; cursor: pointer; transition: transform 0.2s, opacity 0.2s; box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3); }
        .action-btn:hover { opacity: 0.9; transform: translateY(-2px); }
        .action-btn:active { transform: translateY(0); }
        
        .status-display { margin-top: 20px; font-size: 0.95rem; color: var(--accent); font-weight: 600; min-height: 24px; }

        /* Content Card */
        .section-card { background: var(--card); border-radius: 20px; padding: 35px; border: 1px solid rgba(255,255,255,0.05); box-shadow: 0 4px 15px rgba(0,0,0,0.2); }
        .section-card h2 { font-size: 1.4rem; color: var(--accent); margin-bottom: 16px; border-bottom: 1px solid rgba(255,255,255,0.05); padding-bottom: 10px; }
        .section-card h3 { font-size: 1.1rem; color: var(--text); margin-top: 18px; margin-bottom: 8px; }
        .section-card p { color: var(--sub); font-size: 0.95rem; line-height: 1.7; margin-bottom: 14px; }
        .section-card ul { color: var(--sub); font-size: 0.95rem; line-height: 1.7; padding-left: 20px; margin-bottom: 16px; }
        .section-card li { margin-bottom: 8px; }

        /* FAQ Styling */
        .faq-item { margin-bottom: 20px; }
        .faq-item h3 { color: var(--accent); font-size: 1.1rem; margin-bottom: 6px; }
        .faq-item p { color: var(--sub); font-size: 0.95rem; line-height: 1.6; }

        /* 4-Column Footer */
        .site-footer { width: 100%; background: #090d16; border-top: 1px solid rgba(255,255,255,0.05); padding: 50px 20px 30px; display: flex; justify-content: center; }
        .footer-container { width: 100%; max-width: 1100px; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; margin-bottom: 40px; }
        .footer-col h4 { font-size: 1rem; color: var(--text); margin-bottom: 16px; }
        .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
        .footer-col ul a { color: var(--sub); text-decoration: none; font-size: 0.85rem; transition: color 0.2s; }
        .footer-col ul a:hover { color: var(--accent); }
        .footer-col p { color: var(--sub); font-size: 0.85rem; line-height: 1.5; }
        .footer-bottom { width: 100%; max-width: 1100px; border-top: 1px solid rgba(255,255,255,0.05); padding-top: 20px; text-align: center; color: var(--sub); font-size: 0.8rem; }