:root {
            --primary-color: rgb(107, 114, 128);
            --primary-dark: #4b5563;
            --primary-light: #9ca3af;
            --accent-color: #d97706;
            --bg-color: #f3f4f6;
            --text-main: #1f2937;
            --text-muted: #6b7280;
            --card-bg: #ffffff;
            --border-color: rgba(107, 114, 128, 0.2);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', sans-serif; background-color: var(--bg-color); color: var(--text-main); line-height: 1.6; }
        a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
        ul { list-style: none; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        
        header { background: var(--card-bg); box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; border-bottom: 2px solid var(--primary-color); }
        .header-inner { display: flex; justify-content: space-between; align-items: center; height: 80px; }
        .logo { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
        .logo img { display: block; height: 45px; width: auto; max-width: 180px; object-fit: contain; flex-shrink: 0; }
        .logo span { display: inline-block; font-size: 22px; font-weight: 800; line-height: 1; color: var(--text-main); white-space: nowrap; letter-spacing: 1px; }
        .desktop-nav { display: flex; gap: 30px; }
        .desktop-nav a { font-size: 16px; font-weight: 500; padding: 10px 0; position: relative; }
        .desktop-nav a:hover { color: var(--accent-color); }
        .desktop-nav a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--accent-color); transition: width 0.3s; }
        .desktop-nav a:hover::after { width: 100%; }
        .header-actions { display: flex; gap: 15px; align-items: center; }
        .btn-main { background: var(--accent-color); color: #fff; padding: 10px 24px; border-radius: 4px; font-weight: bold; }
        .btn-outline { border: 1px solid var(--primary-color); color: var(--primary-dark); padding: 9px 23px; border-radius: 4px; font-weight: bold; }
        .menu-toggle { display: none; font-size: 24px; cursor: pointer; color: var(--primary-dark); }
        
        .mobile-drawer { position: fixed; top: 0; left: -300px; width: 280px; height: 100%; background: #1f2937; color: #fff; z-index: 1000; transition: left 0.3s ease; padding: 20px; display: flex; flex-direction: column; }
        .mobile-drawer.active { left: 0; }
        .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 999; display: none; opacity: 0; transition: opacity 0.3s; }
        .drawer-overlay.active { display: block; opacity: 1; }
        .drawer-close { align-self: flex-end; font-size: 28px; cursor: pointer; margin-bottom: 20px; color: var(--primary-light); }
        .mobile-nav { display: flex; flex-direction: column; gap: 15px; }
        .mobile-nav a { font-size: 18px; padding: 12px; border-bottom: 1px solid rgba(255,255,255,0.1); display: block; }
        .drawer-logo { margin-bottom: 30px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 20px; }
        .drawer-logo .logo span { color: #fff; }

        
        .about-hero { background: url('https://images.unsplash.com/photo-1579532537598-459ecdaf39cc?w=1600&q=80') center/cover; padding: 100px 0; color: #fff; text-align: center; position: relative; }
        .about-hero::before { content: ''; position: absolute; top:0; left:0; width:100%; height:100%; background: rgba(31, 41, 55, 0.85); }
        .about-hero-content { position: relative; z-index: 1; }
        .about-hero h1 { font-size: 40px; margin-bottom: 20px; text-shadow: 0 2px 4px rgba(0,0,0,0.5); }
        .about-hero p { font-size: 18px; max-width: 800px; margin: 0 auto; color: #e5e7eb; }

        .about-section { padding: 80px 0; background: #fff; }
        .about-section:nth-child(even) { background: var(--bg-color); }
        .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
        .about-text h2 { font-size: 32px; color: var(--primary-dark); margin-bottom: 20px; position: relative; padding-bottom: 15px; }
        .about-text h2::after { content: ''; position: absolute; left: 0; bottom: 0; width: 60px; height: 3px; background: var(--accent-color); }
        .about-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 15px; }
        .about-img img { width: 100%; border-radius: 12px; box-shadow: 0 20px 40px rgba(0,0,0,0.1); }

        .trust-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px; }
        .trust-card { background: #fff; padding: 40px 30px; text-align: center; border-radius: 8px; border: 1px solid var(--border-color); box-shadow: 0 5px 15px rgba(0,0,0,0.02); }
        .trust-card .num { font-size: 48px; font-weight: 900; color: var(--accent-color); margin-bottom: 10px; line-height: 1; }
        .trust-card h3 { font-size: 20px; margin-bottom: 10px; }
        
        footer { background: #111827; color: #9ca3af; padding: 60px 0 20px; font-size: 14px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-logo { margin-bottom: 20px; }
        .footer-logo .logo span { color: #fff; }
        .footer-title { color: #fff; font-size: 16px; font-weight: bold; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--accent-color); display: inline-block; }
        .footer-links li { margin-bottom: 10px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; }
        .footer-extra-links a { margin: 0 10px; color: #6b7280; }

        @media (max-width: 992px) {
            .desktop-nav, .header-actions { display: none; }
            .menu-toggle { display: block; }
            .about-grid { grid-template-columns: 1fr; }
            .trust-cards { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; }
        }