:root {
            --sg-primary: #1a365d;
            --sg-primary-light: #2563eb;
            --sg-accent: #f97316;
            --sg-accent-hover: #ea580c;
            --sg-text: #334155;
            --sg-text-muted: #64748b;
            --sg-bg-light: #f1f5f9;
            --sg-bg-white: #ffffff;
            --sg-success: #10b981;
            --sg-border: #e2e8f0;
            --sg-shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
            --sg-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
            --sg-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
            --sg-shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
            --sg-radius: 0.75rem;
            --sg-radius-sm: 0.5rem;
            --sg-transition: all 0.3s ease;
            --sg-font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
            --sg-font-en: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
        }
        
        * { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        
        body {
            font-family: var(--sg-font-family);
            color: var(--sg-text);
            line-height: 1.7;
            overflow-x: hidden;
        }
        
        h1, h2, h3, h4, h5, h6 {
            font-family: var(--sg-font-family);
            font-weight: 700;
            color: var(--sg-primary);
            line-height: 1.3;
        }
        
        a { color: var(--sg-primary-light); transition: var(--sg-transition); text-decoration: none; }
        a:hover { color: var(--sg-accent); }
        
        img { max-width: 100%; height: auto; }
        
        /* 自定义按钮 */
        .btn-sg-primary {
            background: linear-gradient(135deg, var(--sg-primary) 0%, var(--sg-primary-light) 100%);
            border: none; color: white; border-radius: var(--sg-radius-sm);
            padding: 0.75rem 2rem; font-weight: 600; transition: var(--sg-transition);
            box-shadow: 0 4px 14px rgba(26, 54, 93, 0.3);
        }
        .btn-sg-primary:hover {
            transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26, 54, 93, 0.4);
            color: white;
        }
        .btn-sg-accent {
            background: linear-gradient(135deg, var(--sg-accent) 0%, var(--sg-accent-hover) 100%);
            border: none; color: white; border-radius: var(--sg-radius-sm);
            padding: 0.75rem 2rem; font-weight: 600; transition: var(--sg-transition);
            box-shadow: 0 4px 14px rgba(249, 115, 22, 0.3);
        }
        .btn-sg-accent:hover {
            transform: translateY(-2px); box-shadow: 0 6px 20px rgba(249, 115, 22, 0.4);
            color: white;
        }
        .btn-sg-outline {
            border: 2px solid var(--sg-primary); color: var(--sg-primary);
            border-radius: var(--sg-radius-sm); padding: 0.75rem 2rem;
            font-weight: 600; transition: var(--sg-transition); background: transparent;
        }
        .btn-sg-outline:hover {
            background: var(--sg-primary); color: white; transform: translateY(-2px);
        }
        .btn-sg-outline-light {
            border: 2px solid rgba(255,255,255,0.6); color: white;
            border-radius: var(--sg-radius-sm); padding: 0.75rem 2rem;
            font-weight: 600; transition: var(--sg-transition); background: transparent;
        }
        .btn-sg-outline-light:hover {
            background: white; color: var(--sg-primary); transform: translateY(-2px);
        }
        
        /* 自定义卡片 */
        .card-sg {
            border: none; border-radius: var(--sg-radius);
            background: white; box-shadow: var(--sg-shadow);
            transition: var(--sg-transition); overflow: hidden;
        }
        .card-sg:hover {
            transform: translateY(-8px); box-shadow: var(--sg-shadow-xl);
        }
        .card-sg .card-img-top {
            transition: transform 0.5s ease;
        }
        .card-sg:hover .card-img-top {
            transform: scale(1.05);
        }
        
        /* 章节标题 */
        .section-title {
            position: relative; display: inline-block;
            padding-bottom: 1rem; margin-bottom: 1.5rem;
        }
        .section-title::after {
            content: ''; position: absolute; left: 50%; bottom: 0;
            transform: translateX(-50%); width: 60px; height: 4px;
            background: linear-gradient(90deg, var(--sg-primary-light), var(--sg-accent));
            border-radius: 2px;
        }
        .section-title.text-start::after {
            left: 0; transform: none;
        }
        
        /* 信任徽章 */
        .trust-badge {
            display: inline-flex; align-items: center; gap: 0.5rem;
            padding: 0.5rem 1rem; background: rgba(255,255,255,0.95);
            border-radius: 2rem; font-size: 0.875rem; color: var(--sg-text);
            box-shadow: var(--sg-shadow-sm); backdrop-filter: blur(10px);
        }
        
        /* 渐变背景 */
        .bg-gradient-primary {
            background: linear-gradient(135deg, var(--sg-primary) 0%, #1e4b8f 50%, var(--sg-primary-light) 100%);
        }
        .bg-gradient-accent {
            background: linear-gradient(135deg, var(--sg-accent) 0%, #fb923c 100%);
        }
        
        /* 动画 */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fadeInUp {
            animation: fadeInUp 0.6s ease forwards;
        }
        .animate-delay-1 { animation-delay: 0.1s; }
        .animate-delay-2 { animation-delay: 0.2s; }
        .animate-delay-3 { animation-delay: 0.3s; }
        .animate-delay-4 { animation-delay: 0.4s; }
        
        /* 滚动显示 */
        .reveal {
            opacity: 0; transform: translateY(30px); transition: all 0.6s ease;
        }
        .reveal.active {
            opacity: 1; transform: translateY(0);
        }
        
        /* 产品标签 */
        .product-tag {
            display: inline-block; padding: 0.35rem 0.85rem;
            background: var(--sg-bg-light); color: var(--sg-primary);
            border-radius: 2rem; font-size: 0.8125rem; font-weight: 500;
            border: 1px solid var(--sg-border); transition: var(--sg-transition);
            margin: 0.25rem;
        }
        .product-tag:hover {
            background: var(--sg-primary); color: white; border-color: var(--sg-primary);
        }
        
        /* 面包屑 */
        .breadcrumb-sg {
            background: none; padding: 0; margin: 0;
        }
        .breadcrumb-sg .breadcrumb-item + .breadcrumb-item::before {
            content: '›'; color: var(--sg-text-muted); padding: 0 0.5rem;
        }
        .breadcrumb-sg .breadcrumb-item a { color: var(--sg-text-muted); }
        .breadcrumb-sg .breadcrumb-item a:hover { color: var(--sg-primary); }
        .breadcrumb-sg .breadcrumb-item.active { color: var(--sg-primary); font-weight: 600; }
        
        /* 响应式字体 */
        @media (max-width: 768px) {
            h1 { font-size: 1.75rem !important; }
            h2 { font-size: 1.5rem !important; }
            h3 { font-size: 1.25rem !important; }
            .display-4 { font-size: 2rem !important; }
            .display-5 { font-size: 1.75rem !important; }
            .display-6 { font-size: 1.5rem !important; }
        }
        
        /* 打印样式 */
        
/* 右侧悬浮栏 + 左侧弹出样式 */
.floating-cta { position: fixed; right: 15px; top: 50%; transform: translateY(-50%); z-index: 1050; display: flex; flex-direction: column; gap: 12px; }
.cta-btn { width: 60px; height: 60px; border-radius: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center; text-decoration: none; box-shadow: 0 4px 15px rgba(0,0,0,0.2); transition: all 0.3s ease; font-size: 12px; color: white; position: relative; }
.cta-btn i { font-size: 22px; margin-bottom: 2px; }
.cta-btn span { display: none; }
.cta-btn:hover { width: 60px; border-radius: 50%; flex-direction: column; justify-content: center; padding-left: 0; }
.cta-btn:hover i { margin-bottom: 2px; margin-right: 0; }
.cta-btn:hover span { display: none; }
.cta-btn .cta-tooltip {
    display: none;
    position: absolute;
    right: 75px;
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    background: white;
    color: #333;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    z-index: 1060;
    align-items: center;
    gap: 8px;
}
.cta-btn .cta-tooltip::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    border-left: 6px solid white;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
}
.cta-btn .qr-tooltip {
    display: none;
    position: absolute;
    right: 75px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    padding: 10px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.25);
    z-index: 1060;
}
.cta-btn .qr-tooltip img {
    width: 180px;
    height: 180px;
    display: block;
    border-radius: 8px;
}
.cta-btn .qr-tooltip::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    border-left: 8px solid white;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
}


/* 右侧悬浮栏 + 左侧弹出样式 */
.floating-cta { position: fixed; right: 15px; top: 50%; transform: translateY(-50%); z-index: 1050; display: flex; flex-direction: column; gap: 12px; }
.cta-btn { width: 60px; height: 60px; border-radius: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center; text-decoration: none; box-shadow: 0 4px 15px rgba(0,0,0,0.2); transition: all 0.3s ease; font-size: 12px; color: white; position: relative; }
.cta-btn i { font-size: 22px; margin-bottom: 2px; }
.cta-btn span { display: none; }
.cta-btn:hover { width: 60px; border-radius: 50%; flex-direction: column; justify-content: center; padding-left: 0; }
.cta-btn:hover i { margin-bottom: 2px; margin-right: 0; }
.cta-btn:hover span { display: none; }
.cta-btn .cta-tooltip {
    display: none;
    position: absolute;
    right: 75px;
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    background: white;
    color: #333;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    z-index: 1060;
    align-items: center;
    gap: 8px;
}
.cta-btn .cta-tooltip::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    border-left: 6px solid white;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
}
.cta-btn .qr-tooltip {
    display: none;
    position: absolute;
    right: 75px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    padding: 10px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.25);
    z-index: 1060;
}
.cta-btn .qr-tooltip img {
    width: 180px;
    height: 180px;
    display: block;
    border-radius: 8px;
}
.cta-btn .qr-tooltip::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    border-left: 8px solid white;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
}

@media print {
            .floating-cta, .mobile-bottom-bar, .global-back-btn, .navbar { display: none !important; }
        }