: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', 'Microsoft YaHei', 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; box-shadow: 0 4px 6px rgba(217, 119, 6, 0.2); }
        .btn-main:hover { background: #b45309; transform: translateY(-2px); color: #fff; }
        .btn-outline { border: 1px solid var(--primary-color); color: var(--primary-dark); padding: 9px 23px; border-radius: 4px; font-weight: bold; }
        .btn-outline:hover { background: var(--primary-color); color: #fff; }
        
        
        .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; box-shadow: 2px 0 15px rgba(0,0,0,0.5); }
        .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; }
        .mobile-nav a:hover { color: var(--accent-color); padding-left: 20px; }
        .drawer-logo { margin-bottom: 30px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 20px; }
        .drawer-logo .logo span { color: #fff; }
        
        
        .hero { background: linear-gradient(135deg, #1f2937 0%, var(--primary-dark) 100%); color: #fff; padding: 80px 0; position: relative; overflow: hidden; }
        .hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(217, 119, 6, 0.1) 0%, transparent 60%); pointer-events: none; }
        .hero-inner { display: flex; align-items: center; justify-content: space-between; position: relative; z-index: 1; }
        .hero-content { flex: 1; max-width: 600px; }
        .hero-title { font-size: 48px; font-weight: 900; margin-bottom: 20px; line-height: 1.2; text-shadow: 0 2px 4px rgba(0,0,0,0.3); }
        .hero-title span { color: var(--accent-color); }
        .hero-desc { font-size: 18px; color: #e5e7eb; margin-bottom: 40px; }
        .hero-visual { flex: 1; display: flex; justify-content: flex-end; }
        .hero-visual img { max-width: 90%; height: auto; border-radius: 12px; box-shadow: 0 20px 40px rgba(0,0,0,0.4); transform: perspective(1000px) rotateY(-15deg); transition: transform 0.5s; }
        .hero-visual img:hover { transform: perspective(1000px) rotateY(0deg); }
        
        
        .features { padding: 60px 0; background: #fff; margin-top: -30px; position: relative; z-index: 10; border-radius: 12px 12px 0 0; box-shadow: 0 -5px 20px rgba(0,0,0,0.05); }
        .feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
        .feature-item { text-align: center; padding: 30px 20px; border: 1px solid var(--border-color); border-radius: 8px; background: var(--bg-color); transition: transform 0.3s; }
        .feature-item:hover { transform: translateY(-5px); border-color: var(--accent-color); background: #fff; box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
        .feature-icon { font-size: 40px; color: var(--accent-color); margin-bottom: 15px; }
        .feature-item h3 { font-size: 18px; margin-bottom: 10px; color: var(--text-main); }
        .feature-item p { font-size: 14px; color: var(--text-muted); }
        
        
        .intro { padding: 80px 0; background: var(--bg-color); }
        .intro-inner { display: flex; align-items: center; gap: 60px; }
        .intro-img { flex: 1; }
        .intro-img img { width: 100%; border-radius: 8px; box-shadow: 0 10px 30px rgba(107,114,128,0.2); }
        .intro-text { flex: 1; }
        .section-tag { display: inline-block; padding: 4px 12px; background: rgba(107,114,128,0.1); color: var(--primary-dark); font-size: 14px; font-weight: bold; border-radius: 20px; margin-bottom: 15px; }
        .intro-text h2 { font-size: 36px; margin-bottom: 20px; color: var(--text-main); }
        .intro-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; }
        .intro-list { list-style: none; margin-bottom: 30px; }
        .intro-list li { position: relative; padding-left: 25px; margin-bottom: 10px; font-weight: 500; }
        .intro-list li::before { content: '✓'; position: absolute; left: 0; color: var(--accent-color); font-weight: bold; }
        
        
        .articles-section { padding: 80px 0; background: #fff; }
        .section-header { text-align: center; margin-bottom: 50px; }
        .section-header h2 { font-size: 32px; color: var(--text-main); margin-bottom: 15px; }
        .section-header p { color: var(--text-muted); max-width: 600px; margin: 0 auto; }
        .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .article-card { background: var(--bg-color); border-radius: 8px; overflow: hidden; border: 1px solid var(--border-color); transition: all 0.3s; display: flex; flex-direction: column; }
        .article-card:hover { transform: translateY(-5px); box-shadow: 0 15px 30px rgba(0,0,0,0.1); }
        .article-img { width: 100%; height: 200px; overflow: hidden; position: relative; }
        .article-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
        .article-card:hover .article-img img { transform: scale(1.05); }
        .article-tag { position: absolute; top: 15px; left: 15px; background: var(--accent-color); color: #fff; padding: 4px 10px; font-size: 12px; border-radius: 4px; z-index: 2; }
        .article-content { padding: 20px; flex: 1; display: flex; flex-direction: column; }
        .article-title { font-size: 18px; font-weight: bold; margin-bottom: 10px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .article-title a { color: var(--text-main); }
        .article-title a:hover { color: var(--accent-color); }
        .article-desc { font-size: 14px; color: var(--text-muted); margin-bottom: 20px; flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
        .article-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--primary-light); border-top: 1px solid var(--border-color); padding-top: 15px; }
        .meta-item { display: flex; align-items: center; gap: 5px; }
        
        
        .cta { background: var(--primary-dark); padding: 60px 0; text-align: center; color: #fff; }
        .cta h2 { font-size: 32px; margin-bottom: 20px; }
        .cta p { font-size: 18px; color: #d1d5db; margin-bottom: 30px; }
        
        
        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-about p { margin-bottom: 15px; line-height: 1.8; }
        .footer-title { color: #fff; font-size: 16px; font-weight: bold; margin-bottom: 20px; position: relative; padding-bottom: 10px; }
        .footer-title::after { content: ''; position: absolute; left: 0; bottom: 0; width: 30px; height: 2px; background: var(--accent-color); }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a:hover { color: var(--accent-color); padding-left: 5px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; display: flex; flex-direction: column; gap: 10px; }
        .footer-extra-links a { margin: 0 10px; color: #6b7280; }
        .footer-extra-links a:hover { color: #fff; }
        
        
        @media (max-width: 992px) {
            .desktop-nav, .header-actions { display: none; }
            .menu-toggle { display: block; }
            .hero-inner { flex-direction: column; text-align: center; }
            .hero-content { margin-bottom: 40px; }
            .hero-title { font-size: 36px; }
            .feature-grid { grid-template-columns: repeat(2, 1fr); }
            .intro-inner { flex-direction: column; }
            .article-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .article-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; text-align: center; }
            .footer-title::after { left: 50%; transform: translateX(-50%); }
            .feature-grid { grid-template-columns: 1fr; }
        }