/* =========================================
       GLOBAL & VARIABLES
       ========================================= */
    :root {
        --hz-navy: #0F172A;     
        --hz-text: #334155;     
        --hz-text-light: #64748B; 
        
        /* 🟢 【关键修改】将 Teal 变量也改为橙色，实现全站特效统一 */
        --hz-teal: #ec682e;     
        --hz-orange: #ec682e;   
        
        --hz-bg-white: #FFFFFF;
        --hz-bg-gray: #FFFFFF; 
        --hz-border: #E2E8F0;
        
        --font-heading: 'Poppins', sans-serif;
        --font-body: 'Open Sans', sans-serif;
    }
    
    body { 
        margin: 0; 
        font-family: var(--font-body);
        font-weight: 400;
        background-color: var(--hz-bg-white); 
        color: var(--hz-text); 
        overflow-x: hidden; 
    }
    
    h1, h2, h3, p { margin: 0; }
    
    .container { 
        max-width: 1200px; 
        margin: 0 auto; 
        padding: 0 40px; 
        position: relative; 
        z-index: 2; 
    }
    
    .section-spacing { 
        padding: 40px 0; 
    }
    
    .hero-spacing {
        padding: 20px 0;
    }
    
    .badge { 
        display: inline-block; 
        padding: 6px 12px; 
        background: #FFF7ED; 
        color: var(--hz-orange); 
        border: 1px solid rgba(236, 104, 46, 0.2); 
        border-radius: 100px; 
        font-size: 0.75rem; 
        font-family: var(--font-heading);
        font-weight: 600; 
        letter-spacing: 1px; 
        text-transform: uppercase; 
        margin-bottom: 15px; 
    }
    
    /* 🟢 按钮样式：默认橙底白字 */
    .btn-primary { 
        display: inline-flex; 
        align-items: center; 
        gap: 10px; 
        background: var(--hz-orange); 
        color: white; 
        border: 1px solid var(--hz-orange); 
        padding: 14px 32px; 
        border-radius: 6px; 
        text-decoration: none; 
        font-family: var(--font-heading); 
        font-weight: 600; 
        transition: all 0.3s ease; 
        box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.1);
        margin-top: 20px; 
    }
    
    /* 🟢 按钮悬停：反色 (白底橙字) */
    .btn-primary:hover { 
        transform: translateY(-2px); 
        background: #ffffff; 
        color: var(--hz-orange);
        border-color: var(--hz-orange);
        box-shadow: 0 10px 15px -3px rgba(236, 104, 46, 0.2);
    }
    .btn-primary svg { stroke: currentColor; }

    /* =========================================
       SECTION 1: HERO
       ========================================= */
    .hero-section {
        min-height: auto;
        display: flex;
        align-items: center;
        background-color: var(--hz-bg-white);
        position: relative;
        overflow: hidden;
    }
    
    .bg-grid-light {
        position: absolute; top: 0; left: 0; width: 100%; height: 100%;
        background-image: linear-gradient(rgba(15, 23, 42, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(15, 23, 42, 0.03) 1px, transparent 1px);
        background-size: 40px 40px;
        z-index: 0;
    }

    .hero-content { display: grid; grid-template-columns: 1fr 1.1fr; gap: 30px; align-items: center; position: relative; z-index: 2; }
    
    .hero-text h1 { 
        font-size: 3.2rem; 
        line-height: 1.2; 
        color: var(--hz-navy);
        margin-bottom: 20px; 
        letter-spacing: -0.5px;
        font-family: var(--font-heading);
        font-weight: 500;
    }
    
    .hero-text p {
        font-size: 1.1rem;
        line-height: 1.6;
        color: var(--hz-text);
        font-family: var(--font-body);
        font-weight: 400;
    }
    
    .hero-visual { 
        position: relative; 
        overflow: hidden;
        border-radius: 16px;
        box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.15); 
        background: #fff;
    }
    
    .hero-img { 
        width: 100%; 
        display: block;
        transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1); 
    }
    .hero-visual:hover .hero-img { transform: scale(1.03); }

    /* =========================================
       SECTION 2: HARDWARE
       ========================================= */
    .hardware-section { background-color: var(--hz-bg-white); text-align: center; }
    
    .section-title { 
        font-size: 2.25rem; 
        margin-bottom: 10px; 
        color: var(--hz-navy); 
        font-family: var(--font-heading);
        font-weight: 500; 
    }
    
    .section-subtitle { 
        color: var(--hz-text-light); 
        max-width: 600px; 
        margin: 0 auto 30px auto; 
        line-height: 1.5; 
        font-family: var(--font-heading);
        font-weight: 600;
    }

    .hardware-layout { 
        display: grid; 
        grid-template-columns: 0.85fr 1.15fr; 
        gap: 40px; 
        align-items: center; 
        text-align: left; 
    }
    
    .edge-box-column { display: flex; flex-direction: column; gap: 20px; }

    .edge-box-container {
        position: relative; 
        padding: 20px; 
        background: #fff;
        border: 1px solid var(--hz-border); 
        border-radius: 16px;
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
    }
    
    .box-img { width: 100%; height: auto; display: block; transition: transform 0.3s;}
    .edge-box-container:hover .box-img { transform: scale(1.02); }
    
    /* 🟢 标记点：使用橙色 (var(--hz-teal) 已改为橙色) */
    .hotspot {
        position: absolute; 
        width: 12px; height: 12px; 
        background: var(--hz-teal); 
        border-radius: 50%;
        cursor: pointer; 
        box-shadow: 0 0 0 4px rgba(236, 104, 46, 0.2); 
        animation: pulse 2s infinite;
        border: 2px solid #fff; 
        z-index: 2; 
    }
    
    .hotspot::after {
        content: attr(data-tip); 
        position: absolute; bottom: 25px; left: 50%; transform: translateX(-50%);
        background: var(--hz-navy); color: #fff; padding: 5px 10px; 
        font-size: 10px; border-radius: 4px; 
        white-space: nowrap; opacity: 0; transition: opacity 0.3s; pointer-events: none;
        font-family: var(--font-heading);
        font-weight: 600;
    }
    .hotspot:hover::after { opacity: 1; }
    
    @keyframes pulse { 
        0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(236, 104, 46, 0.4); } 
        70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(236, 104, 46, 0); } 
        100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(236, 104, 46, 0); } 
    }

    .sensor-grid { 
        display: grid; 
        grid-template-columns: repeat(2, 1fr); 
        gap: 30px 5px  ; 
    }
    
    .sensor-card {
        background: #fff; 
        border: 1px solid var(--hz-border); 
        border-radius: 12px; 
        padding: 12px; 
        text-align: center; 
        transition: all 0.3s;
        display: flex; flex-direction: column; justify-content: center; align-items: center;     
        height: 100%;            
        min-height: 130px;       
    }
    /* 🟢 悬停边框：橙色 */
    .sensor-card:hover { 
        border-color: var(--hz-teal); 
        transform: translateY(-3px); 
        box-shadow: 0 10px 25px -5px rgba(236, 104, 46, 0.15); 
    }
    
    /* 🟢 图标尺寸保持大号 (80px) */
    .sensor-icon-box { 
        width: 80px; height: 80px; 
        margin: 0 auto 8px auto; 
        background: #F8FAFC; 
        border-radius: 50%; display: flex; align-items: center; justify-content: center;
        overflow: hidden; border: 1px solid var(--hz-border);
    }
    
    .sensor-real-img { width: 80%; height: 80%; object-fit: contain; }

    .sensor-name { 
        color: var(--hz-navy); font-size: 0.8rem; margin-bottom: 3px; 
        font-family: var(--font-heading);
        font-weight: 600;
    }
    .sensor-desc { 
        font-size: 0.65rem; color: var(--hz-text-light); line-height: 1.2; 
        font-family: var(--font-body);
        font-weight: 400;
    }

    /* =========================================
       SECTION 3: AI WORKFLOW
       ========================================= */
    .workflow-section { background: var(--hz-bg-white); }
    .workflow-steps { display: flex; justify-content: space-between; position: relative; margin-top: 30px; }
    .workflow-line-bg { position: absolute; top: 40px; left: 0; width: 100%; height: 2px; background: #E2E8F0; z-index: 0; }
    /* 🟢 流光线条：橙色 */
    .workflow-line-active { position: absolute; top: 40px; left: 0; width: 100%; height: 2px; background: linear-gradient(90deg, transparent, var(--hz-teal), transparent); z-index: 1; background-size: 50% 100%; animation: flow-line 3s linear infinite; }
    @keyframes flow-line { 0% { background-position: -50% 0; } 100% { background-position: 150% 0; } }

    .step-item { position: relative; z-index: 2; width: 30%; text-align: center; }
    /* 🟢 步骤圆圈：橙色边框和图标 */
    .step-icon-box { width: 80px; height: 80px; background: #fff; border: 2px solid var(--hz-teal); border-radius: 50%; margin: 0 auto 15px auto; display: flex; align-items: center; justify-content: center; transition: all 0.3s; color: var(--hz-teal); }
    .step-item:hover .step-icon-box { transform: scale(1.1); background: var(--hz-teal); color: #fff; }
    
    .step-num { 
        font-size: 0.75rem; 
        color: var(--hz-teal); /* 橙色 */
        margin-bottom: 5px; display: block; 
        font-family: var(--font-heading);
        font-weight: 600;
    }
    .step-title { 
        font-size: 1.15rem; color: var(--hz-navy); margin-bottom: 8px; 
        font-family: var(--font-heading);
        font-weight: 500;
    }
    .step-desc { 
        font-size: 0.85rem; color: var(--hz-text-light); line-height: 1.5; padding: 0 10px; 
        font-family: var(--font-body);
        font-weight: 400;
    }

    /* =========================================
       SECTION 4: SUCCESS CASE
       ========================================= */
    .case-section { background: var(--hz-bg-white); }
    
    .split-layout { display: flex; gap: 30px; height: 400px; }
    
    .case-card { 
        flex: 1; 
        position: relative; 
        overflow: hidden; 
        border-radius: 16px; 
        background: #fff;
        box-shadow: 0 10px 25px rgba(0,0,0,0.08); 
        border: 1px solid var(--hz-border); 
        transition: box-shadow 0.3s ease;
    }
    .case-card:hover { box-shadow: 0 15px 35px rgba(0,0,0,0.12); }

    .case-bg-img, .software-ui-img { 
        width: 100%; 
        height: 100%; 
        object-fit: cover;
        transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1); 
    }
    .case-card:hover .case-bg-img,
    .case-card:hover .software-ui-img { transform: scale(1.05); }
    
    .case-label { 
        position: absolute; 
        top: 25px; left: 25px; 
        background: rgba(255,255,255,0.95); 
        padding: 8px 16px; 
        border-radius: 6px; 
        font-size: 0.8rem; 
        color: var(--hz-navy); 
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        z-index: 2; opacity: 0; transform: translateY(-15px); transition: all 0.3s ease-in-out;
        font-family: var(--font-heading);
        font-weight: 600;
    }

    .case-label.orange-accent { border-left: 3px solid var(--hz-orange); }
    /* 🟢 右侧卡片也统一使用橙色强调边 */
    .case-label.teal-accent { left: auto; right: 25px; border-right: 3px solid var(--hz-teal); }

    .case-card:hover .case-label { opacity: 1; transform: translateY(0); }

    @media (max-width: 768px) {
        .hero-content, .hardware-layout, .split-layout { grid-template-columns: 1fr; flex-direction: column; height: auto; }
        .hero-text h1 { font-size: 2.5rem; }
        .workflow-steps { flex-direction: column; gap: 30px; }
        .step-item { width: 100%; }
        .workflow-line-bg, .workflow-line-active { display: none; }
        .split-layout { gap: 20px; } 
        .case-card { height: 300px; }
    }