/* =========================================
       GLOBAL VARIABLES
       ========================================= */
    :root {
        --hz-navy: #0F172A;      
        --hz-text: #334155;      
        --hz-text-light: #64748B; 
        --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;
    }
    
    html { scroll-behavior: smooth; }
    
    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; }
    a { text-decoration: none; }
    
    .container { 
        max-width: 1200px; 
        margin: 0 auto; 
        padding: 0 40px; 
        position: relative; 
        z-index: 2; 
    }
    
    /* 🟢 修改：减小板块间距 (从 80px -> 50px) */
    .section-spacing { padding: 50px 0; }
    
    /* 橙色徽章 */
    .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; 
    }
    
    .headline { 
        font-family: var(--font-heading);
        font-weight: 600;
        font-size: 2.5rem; 
        color: var(--hz-navy); 
        line-height: 1.2; 
        margin-bottom: 20px; 
    }
    
    .sub-text {
        font-size: 1.1rem;
        line-height: 1.6;
        color: var(--hz-text-light);
        margin-bottom: 30px;
        max-width: 600px;
    }

    /* 按钮 */
    .btn-primary { 
        display: inline-flex; align-items: center; gap: 10px; 
        background: var(--hz-orange); color: white; 
        border: 1px solid var(--hz-orange); 
        padding: 12px 32px; border-radius: 50px; 
        font-family: var(--font-heading); font-weight: 600; 
        transition: all 0.3s ease; 
        box-shadow: 0 4px 10px rgba(236, 104, 46, 0.3);
    }
    .btn-primary:hover { 
        background: #fff; color: var(--hz-orange); 
        transform: translateY(-2px);
    }
    .btn-outline {
        background: transparent; color: var(--hz-text); 
        border: 1px solid var(--hz-border);
        box-shadow: none;
    }
    .btn-outline:hover {
        border-color: var(--hz-orange); color: var(--hz-orange);
    }

    /* =========================================
       HERO SECTION
       ========================================= */
    .hero-safety {
        position: relative;
        /* Hero 稍微保留多一点 padding 以保持气势 */
        padding: 80px 0;
        background: radial-gradient(circle at top right, rgba(236, 104, 46, 0.05), transparent 40%), #fff;
        overflow: hidden;
    }
    
    .hero-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 60px;
        align-items: center;
    }

    .hero-visual-wrapper {
        position: relative;
        border-radius: 20px;
        overflow: hidden;
        box-shadow: 0 30px 60px -15px rgba(15, 23, 42, 0.2);
    }
    
    .hero-img { width: 100%; display: block; transition: transform 0.6s ease; }
    .hero-visual-wrapper:hover .hero-img { transform: scale(1.05); }

    /* =========================================
       SECTION: URBAN SAFETY (Air Sonar)
       ========================================= */
    .urban-section { background-color: #fff; }
    
    .product-layout {
        display: grid;
        grid-template-columns: 1.1fr 0.9fr; 
        gap: 50px;
        align-items: center;
    }

    .device-showcase {
        position: relative;
        padding: 40px;
        background: #fff; 
        border-radius: 24px;
        border: 1px solid var(--hz-border);
        text-align: center;
        box-shadow: 0 10px 30px -10px rgba(0,0,0,0.05);
    }
    
    .device-img { width: 100%; max-width: 500px; height: auto; filter: drop-shadow(0 20px 40px rgba(0,0,0,0.1)); }

    /* 热点交互 */
    .hotspot {
        position: absolute;
        width: 14px; height: 14px;
        background: var(--hz-orange);
        border-radius: 50%;
        border: 3px solid #fff;
        box-shadow: 0 0 0 4px rgba(236, 104, 46, 0.3);
        cursor: pointer;
        animation: pulse-orange 2s infinite;
        z-index: 10;
    }
    .hotspot:hover::after {
        content: attr(data-tip);
        position: absolute; bottom: 25px; left: 50%; transform: translateX(-50%);
        background: var(--hz-navy); color: #fff; padding: 6px 12px;
        font-size: 12px; border-radius: 6px; white-space: nowrap;
        font-family: var(--font-heading); font-weight: 600;
    }
    @keyframes pulse-orange {
        0% { box-shadow: 0 0 0 0 rgba(236, 104, 46, 0.6); }
        70% { box-shadow: 0 0 0 10px rgba(236, 104, 46, 0); }
        100% { box-shadow: 0 0 0 0 rgba(236, 104, 46, 0); }
    }

    .feature-list { list-style: none; padding: 0; margin-top: 20px; margin-bottom: 30px; }
    .feature-item {
        display: flex; align-items: start; gap: 15px; margin-bottom: 20px;
    }
    .check-icon {
        width: 24px; height: 24px; background: rgba(236, 104, 46, 0.1);
        color: var(--hz-orange); border-radius: 50%; display: flex;
        align-items: center; justify-content: center; flex-shrink: 0;
    }

    /* =========================================
       SECTION: BORDER SECURITY (Defender & DTS)
       ========================================= */
    .border-section { background-color: #fff; } 
    
    .section-header-center { text-align: center; max-width: 700px; margin: 0 auto 60px auto; }

    .border-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }

    .security-card {
        background: #fff;
        border-radius: 16px;
        overflow: hidden;
        border: 1px solid var(--hz-border);
        transition: all 0.3s ease;
        position: relative;
        display: flex; flex-direction: column;
        box-shadow: 0 10px 30px -10px rgba(0,0,0,0.05); 
    }
    .security-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.1);
        border-color: var(--hz-orange);
    }

    .card-visual {
        height: 240px;
        position: relative;
        overflow: hidden;
    }
    .card-bg { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
    .security-card:hover .card-bg { transform: scale(1.05); }

    .card-content { padding: 30px; flex: 1; display: flex; flex-direction: column; }
    .card-title { font-size: 1.5rem; font-family: var(--font-heading); color: var(--hz-navy); margin-bottom: 10px; font-weight: 600; }
    .card-desc { font-size: 0.95rem; color: var(--hz-text-light); line-height: 1.6; margin-bottom: 20px; flex-grow: 1; }

    .tech-tag {
        position: absolute; top: 20px; right: 20px;
        background: rgba(15, 23, 42, 0.85); backdrop-filter: blur(4px);
        color: #fff; padding: 6px 12px; border-radius: 6px;
        font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
    }

    /* Icon Grid for Capabilities */
    .cap-grid {
        display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 50px; /* Reduced margin */
    }
    .cap-item {
        background: #fff; padding: 20px; border-radius: 12px;
        text-align: center; border: 1px solid var(--hz-border);
        box-shadow: 0 5px 15px -5px rgba(0,0,0,0.03);
    }
    .cap-icon { color: var(--hz-orange); margin-bottom: 10px; }
    .cap-title { font-weight: 600; color: var(--hz-navy); font-size: 0.9rem; }

    @media (max-width: 900px) {
        .hero-grid, .product-layout, .border-grid, .cap-grid { grid-template-columns: 1fr; }
        .cap-grid { grid-template-columns: 1fr 1fr; }
        .hero-visual-wrapper { height: 300px; }
        .card-visual { height: 200px; }
    }