:root {
            --primary: #1a1a1a;
            --secondary: #666666;
            --bg-color: #fcfcfc;
            --border-color: #e2e8f0;
            --accent-teal: #008080; 
            --accent-teal-light: #e6fffa;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-color);
            color: var(--primary);
            line-height: 1.6;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.04'/%3E%3C/svg%3E");
        }
		

        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }

        /* =========================================
           2. Hero 区域
           ========================================= */
        .seo-hero {
            padding: 100px 0 60px;
            text-align: center;
            position: relative;
        }
        .seo-tag {
            font-size: 12px; letter-spacing: 2px; color: var(--accent-teal);
            text-transform: uppercase; font-weight: 700; margin-bottom: 20px;
            display: inline-block; border: 1px solid var(--accent-teal);
            padding: 6px 16px; border-radius: 50px;
        }
        .seo-title { font-size: 48px; font-weight: 300; margin-bottom: 20px; }
        .seo-title strong { font-weight: 700; }
        .seo-desc { max-width: 680px; margin: 0 auto; color: var(--secondary); font-size: 16px; }

        /* =========================================
           3. 核心服务卡片 (作为套餐的铺垫)
           ========================================= */
        .link-section { padding: 60px 0; }
        .link-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .link-card {
            background: #fff; border: 1px solid var(--border-color); padding: 30px;
            transition: all 0.3s; display: flex; flex-direction: column;
        }
        .link-card:hover { border-color: var(--accent-teal); transform: translateY(-5px); }
        .icon-box {
            width: 40px; height: 40px; background: var(--accent-teal-light);
            color: var(--accent-teal); display: flex; justify-content: center;
            align-items: center; font-size: 20px; margin-bottom: 20px; border-radius: 8px;
        }
        .link-card h3 { font-size: 18px; margin-bottom: 10px; }
        .link-card p { color: #666; font-size: 14px; margin-bottom: 0; }

        /* =========================================
           4. 核心套餐表 (Tab 切换 - 纯CSS实现)
           ========================================= */
        .pricing-section { padding: 40px 0 100px; }
        
        /* Tab 控制器 */
        .tab-container { text-align: center; margin-bottom: 30px; }
        
        /* 隐藏 Radio 按钮 */
        input[type="radio"] { display: none; }
        
        /* Tab 标签样式 */
        .tab-label {
            display: inline-block; padding: 10px 30px; margin: 0 5px;
            border: 1px solid #e0e0e0; border-radius: 30px; cursor: pointer;
            font-size: 14px; color: #666; transition: all 0.3s; background: #fff;
        }
        .tab-label:hover { color: var(--accent-teal); border-color: var(--accent-teal); }


/* Tab 标签通用样式 */
.tab-label {
  display: inline-block;
  padding: 10px 30px;
  margin: 0 5px;
  border: 1px solid #e0e0e0;
  border-radius: 30px;
  cursor: pointer;
  font-size: 14px;
  color: #666;
  transition: all 0.3s;
  background: #fff;
  /* 防止按钮默认样式 */
  appearance: none;
  border: none;
  outline: none;
}

/* 悬停和激活状态 */
.tab-label:hover,
.tab-label.active {
  color: var(--accent-teal);
  border-color: var(--accent-teal);
}
.tab-label.active {
  background: var(--accent-teal);
  color: #fff;
}

/* Tab 内容通用 */
.tab-content {
  animation: fadeIn 0.5s;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}


        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

        /* 表格样式 */
        .price-table {
            width: 100%; border-collapse: collapse; background: #fff;
            box-shadow: 0 10px 30px rgba(0,0,0,0.04); border-radius: 8px;
            overflow: hidden; border: 1px solid #eee;
        }
        .price-table th { background: #fafafa; padding: 20px; text-align: left; font-weight: 600; color: #333; border-bottom: 1px solid #eee; }
        .price-table td { padding: 20px; border-bottom: 1px solid #eee; color: #666; vertical-align: middle; }
        .price-table tr:last-child td { border-bottom: none; }
        
        .price-tag { font-weight: 700; color: var(--accent-teal); font-size: 18px; }
        .btn-buy-small {
            display: inline-block; padding: 6px 18px; border: 1px solid var(--accent-teal);
            color: var(--accent-teal); border-radius: 4px; font-size: 13px; transition: all 0.3s;
        }
        .btn-buy-small:hover { background: var(--accent-teal); color: #fff; }

        /* =========================================
           5. 进阶服务 (GEO & 快排)
           ========================================= */
        .advanced-section { background: #f8f9fa; padding: 80px 0; border-top: 1px solid #eee; }
        
        .tech-container { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }

        /* 快排盒子 */
        .tech-box { background: #1a1a1a; color: #fff; padding: 40px; border-radius: 8px; }
        .speed-meter { margin: 20px 0; height: 4px; background: #333; position: relative; }
        .speed-bar { position: absolute; left: 0; top: 0; bottom: 0; width: 85%; background: linear-gradient(90deg, var(--accent-teal) 0%, #fff 100%); box-shadow: 0 0 10px var(--accent-teal); }

        /* GEO 盒子 */
        .geo-box { padding: 20px; }
        .chat-ui { background: #fff; border-radius: 12px; padding: 20px; box-shadow: 0 10px 30px rgba(0,0,0,0.05); font-size: 14px; margin-top: 20px; }
        .chat-bubble { padding: 10px 15px; border-radius: 8px; margin-bottom: 10px; }
        .bubble-user { background: #f0f0f0; align-self: flex-end; margin-left: 20%; }
        .bubble-ai { background: var(--accent-teal-light); color: #004d4d; margin-right: 10%; }

        /* 响应式 */
        @media (max-width: 768px) {
            .link-grid, .tech-container { grid-template-columns: 1fr; }
            .price-table { display: block; overflow-x: auto; white-space: nowrap; }
        }
		
		    /* 弹窗遮罩 */
    .modal-overlay {
        display: none; /* 默认隐藏 */
        position: fixed;
        top: 0; left: 0; width: 100%; height: 100%;
        background: rgba(0, 0, 0, 0.6);
        z-index: 9999;
        justify-content: center;
        align-items: center;
        backdrop-filter: blur(3px);
        animation: fadeIn 0.3s;
    }

    /* 弹窗主体 */
    .modal-content {
        background: #fff;
        width: 90%;
        max-width: 500px;
        border-radius: 12px;
        padding: 30px;
        position: relative;
        box-shadow: 0 25px 50px rgba(0,0,0,0.2);
        animation: slideUp 0.3s;
    }

    /* 关闭按钮 */
    .close-btn {
        position: absolute;
        top: 15px; right: 20px;
        font-size: 28px;
        color: #999;
        cursor: pointer;
        transition: 0.2s;
    }
    .close-btn:hover { color: #333; }

    /* 头部 */
    .modal-header { text-align: center; margin-bottom: 25px; border-bottom: 1px solid #eee; padding-bottom: 15px; }
    .modal-header h3 { margin: 0 0 5px 0; font-size: 22px; color: #333; }
    .modal-header p { margin: 0; color: var(--accent-teal, #008080); font-size: 14px; }

    /* 价格显示 */
    .price-display {
        background: #f9f9f9;
        padding: 15px;
        text-align: center;
        border-radius: 6px;
        margin-bottom: 20px;
        font-size: 14px;
        color: #666;
    }
    .price-display span {
        font-size: 24px;
        font-weight: bold;
        color: #d4af37; /* 金色价格 */
        margin-left: 5px;
    }

    /* 表单样式 */
    .form-group { margin-bottom: 15px; }
    .form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; color: #333; }
    .modal-form input, .modal-form textarea {
        width: 100%;
        padding: 10px 15px;
        border: 1px solid #ddd;
        border-radius: 4px;
        font-size: 14px;
        outline: none;
        transition: 0.3s;
        box-sizing: border-box; /* 关键：防止输入框撑破容器 */
    }
    .modal-form input:focus, .modal-form textarea:focus {
        border-color: var(--accent-teal, #008080);
        background: #fcfcfc;
    }

    /* 提交按钮 */
    .btn-submit-order {
        width: 100%;
        padding: 12px;
        background: var(--accent-teal, #008080);
        color: #fff;
        border: none;
        border-radius: 4px;
        font-size: 16px;
        font-weight: bold;
        cursor: pointer;
        margin-top: 10px;
        transition: 0.3s;
    }
    .btn-submit-order:hover { background: #006666; }

    /* 动画 */
    @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
    @keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }