.hero { 
            padding: 180px 0 100px; 
            position: relative; 
            background: radial-gradient(circle at 60% 30%, #fffcf0 0%, #fff 70%); 
            overflow: hidden; 
        }
        
        /* 动态背景网格 */
        .hero-bg-grid {
            position: absolute; width: 200%; height: 200%; top: -50%; left: -50%;
            background-image: linear-gradient(rgba(246, 194, 76, 0.05) 1px, transparent 1px), 
                              linear-gradient(90deg, rgba(246, 194, 76, 0.05) 1px, transparent 1px);
            background-size: 40px 40px;
            transform: perspective(500px) rotateX(60deg);
            z-index: 0;
            pointer-events: none;
            animation: grid-move 20s linear infinite;
        }
        @keyframes grid-move { 0% { transform: perspective(500px) rotateX(60deg) translateY(0); } 100% { transform: perspective(500px) rotateX(60deg) translateY(40px); } }

        .hero-content { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; }
        
        .hero-text h1 { font-size: 3.8rem; line-height: 1.15; margin-bottom: 24px; color: var(--text-dark); letter-spacing: -1.5px; }
        .hero-text p { font-size: 1.2rem; color: var(--text-sub); margin-bottom: 40px; max-width: 560px; line-height: 1.8; }
        
        .trust-badges { display: flex; align-items: center; gap: 20px; margin-top: 40px; opacity: 0.8; }
        .trust-item { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; font-weight: 600; color: #555; }
        .trust-item i { color: #28a745; }

        /* 右侧 3D 悬浮展示区 (CSS Only) */
        .hero-visual-wrapper {
            position: relative;
            height: 500px;
            display: flex;
            align-items: center;
            justify-content: center;
            perspective: 1200px;
        }
        
        .visual-stack {
            position: relative;
            width: 280px;
            height: 480px;
            transform-style: preserve-3d;
            transform: rotateY(-15deg) rotateX(5deg);
            animation: float-3d 6s ease-in-out infinite;
        }
        @keyframes float-3d { 0%, 100% { transform: rotateY(-15deg) rotateX(5deg) translateY(0); } 50% { transform: rotateY(-15deg) rotateX(5deg) translateY(-20px); } }

        /* 图层样式 */
        .layer-card {
            position: absolute; top: 0; left: 0; width: 100%; height: 100%;
            border-radius: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            border: 2px solid #fff;
            background: rgba(255,255,255,0.9);
            backdrop-filter: blur(10px);
            display: flex; flex-direction: column; align-items: center; justify-content: center;
            transition: transform 0.5s;
        }
        
        /* 底部：网页层 */
        .layer-web { 
            transform: translateZ(-60px) translateX(40px); 
            background: linear-gradient(180deg, #f9f9f9 0%, #fff 100%);
            opacity: 0.8;
            border-color: #eee;
        }
        .web-skeleton { width: 80%; height: 10px; background: #eee; border-radius: 5px; margin: 10px 0; }
        
        /* 中间：转换引擎层 */
        .layer-engine {
            transform: translateZ(0px);
            background: linear-gradient(135deg, rgba(246, 194, 76, 0.1) 0%, rgba(255,255,255,0.8) 100%);
            border: 1px solid rgba(246, 194, 76, 0.3);
            z-index: 2;
        }
        .engine-icon { 
            font-size: 4rem; color: var(--primary); 
            animation: pulse-glow 2s infinite; 
            text-shadow: 0 0 20px rgba(246, 194, 76, 0.4);
        }
        
        /* 顶部：APP层 */
        .layer-app {
            transform: translateZ(80px) translateX(-40px);
            background: #fff;
            box-shadow: 0 20px 50px rgba(0,0,0,0.15);
            z-index: 3;
            overflow: hidden;
            border: 4px solid #333; /* 模拟手机边框 */
        }
        .app-screen { width: 100%; height: 100%; background: #fff; position: relative; }
        .app-icon-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; padding: 60px 20px 20px; }
        .app-icon-item { width: 50px; height: 50px; background: #f0f0f0; border-radius: 12px; }
        .app-icon-main { background: var(--primary-gradient); box-shadow: 0 5px 15px rgba(246, 194, 76, 0.4); transform: scale(1.1); border: 2px solid #fff; }

        /* 连接线 */
        .connector-line {
            position: absolute; width: 2px; height: 100px; background: var(--primary);
            transform-origin: top; top: 50%; left: 50%;
        }

        /* Features Grid */
        #features { background: var(--bg-white); }
        .feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
        .feature-card { text-align:center; padding: 40px 30px; border-radius: 16px; transition: var(--transition); border: 1px solid #f0f0f0; box-shadow: var(--shadow-sm); background: #fff; }
        .feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(var(--primary-rgb), 0.3); }
        .feature-icon-box { width: 64px; height: 64px; background: var(--primary-light); border-radius: 16px; display: flex; align-items: center; justify-content: center; margin: 0 auto 24px; color: var(--primary-dark); font-size: 1.5rem; transition: var(--transition); }
        .feature-card:hover .feature-icon-box { background: var(--primary); color: var(--bg-white); transform: scale(1.1); }
        
        /* Stats */
        .stats { padding: 60px 0; background: var(--bg-white); border-top: 1px solid #f9f9f9; border-bottom: 1px solid #f9f9f9; }
        .stats-grid { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 40px; }
        .stat-item { text-align: center; flex: 1; min-width: 150px; }
        .stat-number { font-size: 3rem; font-weight: 800; color: var(--primary); background: -webkit-linear-gradient(#f6c24c, #d6a32b); -webkit-background-clip: text; -webkit-text-fill-color: transparent; font-family: 'Roboto', sans-serif; display: block; }
        .stat-label { font-size: 0.9rem; font-weight: 600; color: var(--text-sub); text-transform: uppercase; letter-spacing: 1px; margin-top: 5px; }

        /* 
         * ==========================================================================
         * === [演示模块] ===
         * ==========================================================================
         */
        #highlights { background: linear-gradient(180deg, #ffffff 0%, #fcfcfc 100%); }
        .feature-row { display: flex; align-items: center; gap: 60px; margin-bottom: 120px; opacity: 0; transform: translateY(40px); transition: all 0.8s ease-out; }
        .feature-row.visible { opacity: 1; transform: translateY(0); }
        .feature-row:nth-child(even) { flex-direction: row-reverse; }
        
        .feature-text { flex: 1; min-width: 300px; }
        .feature-text h2 { font-size: 2rem; margin-bottom: 20px; line-height: 1.3; color: var(--text-dark); }
        .feature-desc { color: var(--text-sub); font-size: 1.05rem; margin-bottom: 30px; }
        .check-list li { margin-bottom: 12px; display: flex; align-items: center; font-weight: 500; color: var(--text-main); }
        .check-list li i { margin-right: 12px; color: var(--primary); background: var(--bg-white); border: 1px solid var(--primary); width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; flex-shrink: 0; }
        .feature-tag { display: inline-block; padding: 6px 14px; background: rgba(var(--primary-rgb), 0.15); color: #b38f00; border-radius: 6px; font-size: 0.8rem; font-weight: 700; margin-bottom: 16px; text-transform: uppercase; }

        /* Mockup Card 通用样式 - 允许 Overflow */
        .feature-mockup { flex: 1; display: flex; justify-content: center; align-items: center; width: 100%; perspective: 1000px; }
        .mockup-card { 
            background: var(--bg-white); 
            border-radius: 20px; 
            padding: 30px; 
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08); 
            width: 100%; 
            max-width: 480px; 
            border: 1px solid #f0f0f0; 
            transition: transform 0.4s ease, box-shadow 0.4s ease; 
            position: relative;
            /* 关键修复：允许子元素溢出（主要是针对 Demo 2 的对比手机） */
            overflow: visible; 
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-height: 340px;
        }
        .feature-row:hover .mockup-card { transform: translateY(-5px); box-shadow: 0 30px 70px rgba(0, 0, 0, 0.12); }

        /* [Demo 1] URL Input */
        .demo-input-wrapper { width: 100%; }
        .url-input-demo { 
            border: 2px solid #eee; border-radius: 12px; padding: 12px 16px; 
            display: flex; align-items: center; margin-bottom: 20px; 
            background: #fafafa; transition: border-color 0.3s;
        }
        .feature-row:hover .url-input-demo { border-color: var(--primary); background: #fff; }
        .url-input-demo i { color: #999; margin-right: 12px; font-size: 1.1rem; }
        .url-text { color: #333; font-family: 'Courier New', monospace; font-weight: 500; font-size: 1rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
        .url-cursor { display: inline-block; width: 2px; height: 20px; background: var(--primary); margin-left: 4px; animation: blink 1s infinite; }
        @keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
        
        .config-box { margin-bottom: 20px; width: 100%; }
        .config-label { font-size: 0.9rem; color: #666; margin-bottom: 6px; display: block; }
        .config-value { background: #f4f4f4; padding: 10px 15px; border-radius: 8px; color: #333; font-weight: 500; border: 1px dashed transparent; }
        .feature-row:hover .config-value { border-color: #ddd; background: #fffcf5; }

        .convert-btn-demo { 
            background: var(--primary); color: #fff; text-align: center; padding: 14px; 
            border-radius: 12px; font-weight: bold; font-size: 1.05rem; 
            width: 100%; cursor: pointer; box-shadow: 0 4px 15px rgba(246, 194, 76, 0.4);
            transition: transform 0.2s;
        }
        .convert-btn-demo:active { transform: scale(0.98); }

        /* 
         * [Demo 2] Comparison - 彻底修复显示一半的问题
         * 逻辑：使用 Flex 布局 + 相对宽度，并确保容器不裁剪
         */
        .comparison-container {
            display: flex;
            align-items: flex-end; /* 底部对齐 */
            justify-content: center;
            width: 100%;
            height: 100%;
            position: relative;
            padding-top: 20px; /* 顶部留空给动画位移 */
        }
        .phone-frame {
            border-radius: 16px 16px 0 0; 
            background: #fff;
            display: flex; flex-direction: column;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            position: relative;
            transition: all 0.4s ease;
            flex-shrink: 0; /* 防止被压缩 */
        }
        /* 左侧手机 */
        .phone-frame.browser {
            width: 44%; 
            height: 240px;
            border: 4px solid #eee; border-bottom: none;
            z-index: 1;
            margin-right: -20px; /* 重叠效果 */
            transform: scale(0.95); /* 视觉退后 */
        }
        /* 右侧手机 */
        .phone-frame.fullscreen {
            width: 50%;
            height: 280px;
            border: 4px solid var(--primary); border-bottom: none;
            box-shadow: 0 20px 40px rgba(246, 194, 76, 0.2);
            z-index: 2;
        }
        
        .frame-header { height: 24px; background: #f0f0f0; border-radius: 12px 12px 0 0; position: relative; }
        .phone-frame.fullscreen .frame-header { background: var(--primary); }
        .frame-content { flex: 1; display: flex; align-items: center; justify-content: center; color: #ddd; font-size: 2.5rem; background: #fafafa; }
        .phone-frame.fullscreen .frame-content { color: var(--primary); background: #fff; font-size: 3.5rem; }
        .browser-bar { height: 40px; background: #f9f9f9; border-top: 1px solid #ddd; display: flex; justify-content: space-around; align-items: center; color: #aaa; font-size: 0.9rem; }
        .fullscreen-tag { 
            position: absolute; bottom: 30px; left: 0; width: 100%; text-align: center; 
            font-size: 0.9rem; font-weight: bold; color: #333; 
            background: rgba(255,255,255,0.95); padding: 5px 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

        /* [Demo 3] Profile */
        .profile-wrapper { display: flex; flex-direction: column; align-items: center; width: 100%; text-align: center; }
        .profile-icon-circle { 
            width: 100px; height: 100px; background: #f9f9f9; border-radius: 50%; 
            display: flex; align-items: center; justify-content: center;
            font-size: 3.5rem; color: #aaa; margin-bottom: 20px;
            transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }
        .feature-row:hover .profile-icon-circle { background: var(--primary-light); color: var(--primary-dark); transform: scale(1.1); }
        .profile-status-badge { 
            background: #e0f8e9; color: #28a745; padding: 6px 18px; 
            border-radius: 30px; font-size: 0.85rem; font-weight: bold; 
            margin: 10px 0 25px; display: inline-flex; align-items: center; gap: 6px;
            opacity: 0.7; transform: translateY(5px); transition: all 0.4s ease 0.2s;
        }
        .feature-row:hover .profile-status-badge { opacity: 1; transform: translateY(0); box-shadow: 0 4px 12px rgba(40, 167, 69, 0.2); }
        .profile-details { width: 100%; border-top: 1px solid #eee; padding-top: 20px; }
        .detail-row { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 0.95rem; }
        .detail-label { color: #666; }
        .detail-val { font-weight: 600; color: #333; }

        /* Process Steps */
        .step-container { display: flex; justify-content: space-between; margin-top: 50px; position: relative; }
        .step-line { position: absolute; top: 40px; left: 10%; right: 10%; height: 2px; background: #f0f0f0; z-index: 0; }
        .step-item { position: relative; z-index: 1; flex: 1; text-align: center; padding: 0 10px; }
        .step-circle { width: 80px; height: 80px; background: var(--bg-white); border: 2px solid var(--primary); border-radius: 50%; margin: 0 auto 20px; display: flex; align-items: center; justify-content: center; font-size: 1.8rem; color: var(--primary); box-shadow: 0 0 0 10px var(--bg-white); transition: var(--transition); }
        .step-item:hover .step-circle { background: var(--primary); color: var(--bg-white); transform: translateY(-5px); box-shadow: 0 10px 25px rgba(var(--primary-rgb), 0.3); }

        /* Pricing */
        .pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; align-items: center; max-width: 1000px; margin: 0 auto; }
        .price-card { background: var(--bg-white); border-radius: 16px; padding: 40px 30px; text-align: center; border: 1px solid #eee; transition: var(--transition); position: relative; overflow: hidden; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; }
        .price-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-md); border-color: rgba(var(--primary-rgb), 0.3); z-index: 5; }
        .price-card.popular { border: 2px solid var(--primary); transform: scale(1.05); z-index: 2; box-shadow: var(--shadow-md); }
        .price-card.popular:hover { transform: scale(1.08); }
        .ribbon { position: absolute; top: 20px; right: -35px; background: var(--primary-gradient); width: 120px; padding: 5px 0; text-align: center; transform: rotate(45deg); font-size: 0.8rem; font-weight: bold; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
        .price-num { font-size: 3rem; font-weight: 800; line-height: 1; color: var(--text-dark); margin: 20px 0 5px; font-family: 'Roboto', sans-serif; }
        .price-unit { font-size: 0.95rem; color: var(--text-sub); margin-bottom: 25px; display: block; }
        .price-list { text-align: left; margin-bottom: 30px; flex: 1; }
        .price-list li { margin-bottom: 14px; color: var(--text-sub); font-size: 0.9rem; display: flex; align-items: center; }
        .price-list li i { color: #27c93f; margin-right: 10px; font-size: 0.8rem; }
        .price-list li i.fa-xmark { color: #ccc; }