:root {
            --primary: #00D4AA;
            --primary-dark: #00B894;
            --secondary: #6C5CE7;
            --accent: #FD79A8;
            --dark-bg: #0F0F23;
            --dark-card: #1A1A2E;
            --dark-hover: #252542;
            --text-primary: #FFFFFF;
            --text-secondary: #B4B4C8;
            --text-muted: #717188;
            --border: rgba(255, 255, 255, 0.1);
            --glow: rgba(0, 212, 170, 0.4);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', 'Noto Sans SC', sans-serif;
            background: var(--dark-bg);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* 背景装饰 */
        .bg-decoration {
            position: fixed;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            z-index: 0;
            pointer-events: none;
            overflow: hidden;
        }

        .bg-gradient-1 {
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, var(--glow) 0%, transparent 70%);
            top: -200px;
            right: -200px;
            animation: float 20s ease-in-out infinite;
        }

        .bg-gradient-2 {
            position: absolute;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(108, 92, 231, 0.3) 0%, transparent 70%);
            bottom: -100px;
            left: -100px;
            animation: float 15s ease-in-out infinite reverse;
        }

        @keyframes float {
            0%, 100% { transform: translate(0, 0) rotate(0deg); }
            33% { transform: translate(30px, -30px) rotate(120deg); }
            66% { transform: translate(-20px, 20px) rotate(240deg); }
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            z-index: 1;
        }

        /* 顶部导航 */
        .top-bar {
            background: rgba(26, 26, 46, 0.8);
            backdrop-filter: blur(20px);
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
            font-size: 13px;
        }

        .top-bar-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-secondary);
        }

        .top-bar-item {
            display: flex;
            gap: 20px;
        }

        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(15, 15, 35, 0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }

        .logo {
            font-size: 32px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -1px;
        }

        .nav {
            display: flex;
            gap: 40px;
            list-style: none;
        }

        .nav a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 15px;
            transition: all 0.3s;
            position: relative;
        }

        .nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width 0.3s;
        }

        .nav a:hover {
            color: var(--primary);
        }

        .nav a:hover::after {
            width: 100%;
        }

        .btn {
            padding: 12px 28px;
            border-radius: 10px;
            font-weight: 600;
            font-size: 15px;
            border: none;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: var(--dark-bg);
            box-shadow: 0 4px 20px var(--glow);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px var(--glow);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary);
            color: var(--dark-bg);
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            cursor: pointer;
            padding: 5px;
        }

        .mobile-toggle span {
            width: 28px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
            transition: all 0.3s;
        }

        /* Hero Section */
        .hero {
            padding: 120px 0 80px;
            position: relative;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 80px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 64px;
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 24px;
            background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-content .highlight {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-content p {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-top: 60px;
        }

        .stat-box {
            text-align: center;
            padding: 24px;
            background: var(--dark-card);
            border: 1px solid var(--border);
            border-radius: 16px;
            transition: all 0.3s;
        }

        .stat-box:hover {
            border-color: var(--primary);
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0, 212, 170, 0.2);
        }

        .stat-number {
            font-size: 36px;
            font-weight: 700;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: block;
            margin-bottom: 8px;
        }

        .stat-label {
            color: var(--text-secondary);
            font-size: 14px;
        }

        .hero-image {
            position: relative;
        }

        .hero-image img {
            width: 100%;
            border-radius: 24px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
            animation: heroFloat 6s ease-in-out infinite;
        }

        @keyframes heroFloat {
            0%, 100% { transform: translateY(0) rotate(-2deg); }
            50% { transform: translateY(-20px) rotate(2deg); }
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* Features Section */
        .section {
            padding: 100px 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 80px;
        }

        .section-label {
            display: inline-block;
            padding: 8px 20px;
            background: rgba(0, 212, 170, 0.1);
            border: 1px solid rgba(0, 212, 170, 0.3);
            border-radius: 30px;
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .section-title {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .section-desc {
            font-size: 18px;
            color: var(--text-secondary);
        }

        /* Products Grid */
        .products-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
        }

        .product-card {
            background: var(--dark-card);
            border: 1px solid var(--border);
            border-radius: 24px;
            overflow: hidden;
            transition: all 0.4s;
            position: relative;
        }

        .product-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, transparent, rgba(0, 212, 170, 0.1));
            opacity: 0;
            transition: opacity 0.4s;
        }

        .product-card:hover {
            transform: translateY(-10px);
            border-color: var(--primary);
            box-shadow: 0 20px 60px rgba(0, 212, 170, 0.3);
        }

        .product-card:hover::before {
            opacity: 1;
        }

        .product-image-wrapper {
            position: relative;
            height: 300px;
            overflow: hidden;
        }

        .product-image-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s;
        }

        .product-card:hover .product-image-wrapper img {
            transform: scale(1.1);
        }

        .product-tag {
            position: absolute;
            top: 20px;
            right: 20px;
            background: var(--primary);
            color: var(--dark-bg);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
        }

        .product-info {
            padding: 32px;
        }

        .product-name {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .product-description {
            color: var(--text-secondary);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .product-features {
            list-style: none;
            margin-bottom: 28px;
        }

        .product-features li {
            padding: 10px 0;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 12px;
            border-bottom: 1px solid var(--border);
        }

        .product-features li:last-child {
            border-bottom: none;
        }

        .product-features li::before {
            content: '✓';
            color: var(--primary);
            font-weight: 700;
            font-size: 18px;
            width: 24px;
            height: 24px;
            background: rgba(0, 212, 170, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .product-price {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 28px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
        }

        .price-tag {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
        }

        /* Security Features */
        .security-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }

        .security-card {
            background: var(--dark-card);
            padding: 40px;
            border-radius: 20px;
            border: 1px solid var(--border);
            transition: all 0.3s;
        }

        .security-card:hover {
            border-color: var(--primary);
            transform: translateY(-5px);
        }

        .security-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, rgba(0, 212, 170, 0.2), rgba(108, 92, 231, 0.2));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            margin-bottom: 24px;
        }

        .security-title {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .security-desc {
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Showcase Section */
        .showcase {
            background: var(--dark-card);
            border-radius: 24px;
            padding: 80px;
            border: 1px solid var(--border);
        }

        .showcase-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .showcase-image {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
        }

        .showcase-image img {
            width: 100%;
            display: block;
        }

        .showcase-content h3 {
            font-size: 40px;
            margin-bottom: 24px;
        }

        .showcase-content p {
            color: var(--text-secondary);
            font-size: 18px;
            margin-bottom: 20px;
            line-height: 1.8;
        }

        .showcase-list {
            list-style: none;
            margin: 32px 0;
        }

        .showcase-list li {
            padding: 16px 0;
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 16px;
        }

        .showcase-list li::before {
            content: '→';
            color: var(--primary);
            font-size: 24px;
            font-weight: 700;
        }

        /* Gallery */
        .gallery-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .gallery-item {
            position: relative;
            overflow: hidden;
            border-radius: 16px;
            aspect-ratio: 1;
            cursor: pointer;
        }

        .gallery-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .gallery-item:hover img {
            transform: scale(1.15);
        }

        .gallery-item::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.7) 100%);
            opacity: 0;
            transition: opacity 0.3s;
        }

        .gallery-item:hover::after {
            opacity: 1;
        }

        /* Steps */
        .steps-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .step {
            display: flex;
            gap: 40px;
            margin-bottom: 60px;
            position: relative;
        }

        .step::before {
            content: '';
            position: absolute;
            left: 39px;
            top: 90px;
            width: 2px;
            height: calc(100% - 70px);
            background: linear-gradient(180deg, var(--primary), transparent);
        }

        .step:last-child::before {
            display: none;
        }

        .step-number {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 36px;
            font-weight: 700;
            color: var(--dark-bg);
            flex-shrink: 0;
            box-shadow: 0 10px 30px var(--glow);
        }

        .step-content {
            flex: 1;
            background: var(--dark-card);
            padding: 32px;
            border-radius: 20px;
            border: 1px solid var(--border);
        }

        .step-title {
            font-size: 26px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .step-desc {
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .step-image {
            width: 100%;
            border-radius: 12px;
            margin: 20px 0;
        }

        .step-tip {
            background: rgba(253, 121, 168, 0.1);
            border-left: 3px solid var(--accent);
            padding: 16px 20px;
            border-radius: 8px;
            color: var(--text-secondary);
            margin-top: 20px;
        }

        .step-tip strong {
            color: var(--accent);
        }

        /* FAQ */
        .faq-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .faq {
            background: var(--dark-card);
            border: 1px solid var(--border);
            border-radius: 16px;
            margin-bottom: 20px;
            overflow: hidden;
            transition: all 0.3s;
        }

        .faq:hover {
            border-color: var(--primary);
        }

        .faq-question {
            padding: 28px 32px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 18px;
            font-weight: 600;
            user-select: none;
        }

        .faq-toggle {
            width: 36px;
            height: 36px;
            background: rgba(0, 212, 170, 0.1);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--primary);
            transition: all 0.3s;
        }

        .faq.active .faq-toggle {
            transform: rotate(180deg);
            background: var(--primary);
            color: var(--dark-bg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-answer-content {
            padding: 0 32px 28px;
            color: var(--text-secondary);
            line-height: 1.9;
        }

        .faq.active .faq-answer {
            max-height: 800px;
        }

        /* CTA */
        .cta {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 32px;
            padding: 80px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta::before {
            content: '';
            position: absolute;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent);
            top: -200px;
            right: -200px;
            animation: rotate 20s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .cta-content {
            position: relative;
            z-index: 1;
        }

        .cta h2 {
            font-size: 48px;
            color: var(--dark-bg);
            margin-bottom: 20px;
        }

        .cta p {
            font-size: 20px;
            color: rgba(15, 15, 35, 0.8);
            margin-bottom: 40px;
        }

        .cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
        }

        .btn-dark {
            background: var(--dark-bg);
            color: var(--primary);
        }

        .btn-dark:hover {
            background: var(--dark-card);
        }

        /* Footer */
        .footer {
            background: var(--dark-card);
            padding: 80px 0 40px;
            border-top: 1px solid var(--border);
            margin-top: 100px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 60px;
            margin-bottom: 60px;
        }

        .footer-brand h3 {
            font-size: 32px;
            margin-bottom: 20px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .footer-brand p {
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 24px;
        }

        .footer-section h4 {
            font-size: 18px;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: var(--primary);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid var(--border);
            color: var(--text-muted);
            font-size: 14px;
        }

        /* Scroll to top */
        .scroll-top {
            position: fixed;
            bottom: 40px;
            right: 40px;
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--dark-bg);
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            box-shadow: 0 10px 30px var(--glow);
            z-index: 999;
        }

        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .scroll-top:hover {
            transform: translateY(-5px);
        }
/* =================================
   响应式 CSS (配合 JavaScript)
   =================================
*/

/* 汉堡菜单 "X" 变形动画 */
/* 当 .mobile-toggle 拥有 .active 类时 (由 JS 添加) */
.mobile-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}
.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}
.mobile-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}


/* 响应式: 平板电脑 (1024px 及以下) */
@media (max-width: 1024px) {
    .hero-grid,
    .showcase-grid {
        grid-template-columns: 1fr;
        gap: 60px; /* 增加一些垂直间距 */
    }
    
    .hero-grid {
        text-align: center; /* 居中内容 */
    }

    .hero-buttons {
        justify-content: center; /* 居中按钮 */
    }

    .hero-content h1 {
        font-size: 52px; /* 缩小标题 */
    }

    .hero-content p {
        font-size: 18px;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
    
    /* 隐藏主导航右侧的按钮，为移动菜单做准备 */
    .header-content .btn-primary {
         display: none;
    }
    
    /* 将导航菜单移到右侧 */
    .nav {
        margin-left: auto;
    }
}

/* 响应式: 移动设备 (768px 及以下) */
@media (max-width: 768px) {
    .top-bar {
        display: none; /* 隐藏顶部信息栏 */
    }

    .header-content {
        padding: 15px 0; /* 缩小头部内边距 */
    }

    /* 您的原始菜单 .nav 样式 (激活时显示) */
    .nav {
        position: fixed;
        top: 75px; /* 调整为新的头部高度 */
        left: -100%;
        width: 100%;
        height: calc(100vh - 75px);
        background: rgba(15, 15, 35, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 40px;
        gap: 20px;
        transition: left 0.4s;
        margin-left: 0; /* 重置 margin */
    }

    .nav.active {
        left: 0;
    }

    .nav a {
        font-size: 20px; /* 放大菜单字体 */
        color: var(--text-primary);
    }

    .mobile-toggle {
        display: flex; /* 显示汉堡菜单按钮 */
    }

    /* --- 其他布局修复 --- */

    /* Hero 区域 */
    .hero {
        padding: 80px 0 60px;
    }
    
    .hero-content h1 {
        font-size: 42px;
    }

    .hero-content p {
        font-size: 16px;
    }

    /* 修复: Hero 统计模块改为单列 */
    .hero-stats {
        grid-template-columns: 1fr;
    }

    /* 修复: Hero 按钮改为垂直堆叠 */
    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }
    /* 让按钮撑满宽度 */
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    /* 基础区块 */
    .section {
        padding: 80px 0;
    }
    
    .section-title {
        font-size: 32px;
    }

    .section-desc {
        font-size: 16px;
    }

    /* 各个网格布局全部改为单列 */
    .products-grid,
    .security-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .showcase,
    .cta {
        padding: 40px 24px;
    }

    .showcase-content h3 {
        font-size: 30px;
    }
    
    .cta h2 {
        font-size: 32px;
    }
    
    .cta p {
        font-size: 16px;
    }

    /* 修复: CTA 按钮改为垂直堆叠 */
    .cta-buttons {
        flex-direction: column;
        gap: 12px;
    }
    .cta-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-brand p {
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }

    /* 修复: Step 布局改为垂直并居中数字 */
    .step {
        flex-direction: column;
        gap: 20px;
        align-items: center; /* 居中数字 */
        text-align: center; /* 居中文本 */
    }

    .step::before {
        display: none; /* 隐藏时间线 */
    }
    
    .step-content {
        padding: 24px;
    }
    
    .step-title {
        font-size: 22px;
    }
    
    /* FAQ */
    .faq-question {
        padding: 20px;
        font-size: 16px;
    }
    .faq-answer-content {
        padding: 0 20px 20px;
        font-size: 15px;
    }
}
/* 响应式: 移动设备 (768px 及以下) */
@media (max-width: 768px) {
    /* 修复容器内边距 */
    .container {
        padding: 0 16px; /* 从 24px 减少到 16px */
    }

    .top-bar {
        display: none;
    }

    .header-content {
        padding: 15px 0;
    }

    /* 导航菜单 */
    .nav {
        position: fixed;
        top: 75px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 75px);
        background: rgba(15, 15, 35, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 40px 20px; /* 减少内边距 */
        gap: 20px;
        transition: left 0.4s;
        margin-left: 0;
        overflow-y: auto; /* 添加滚动 */
    }

    .nav.active {
        left: 0;
    }

    .nav a {
        font-size: 20px;
        color: var(--text-primary);
    }

    .mobile-toggle {
        display: flex;
    }

    /* Hero 区域 */
    .hero {
        padding: 60px 0 40px; /* 进一步减少内边距 */
    }
    
    .hero-content h1 {
        font-size: 36px; /* 从 42px 减少 */
        line-height: 1.2;
    }

    .hero-content p {
        font-size: 16px;
        margin-bottom: 24px; /* 减少间距 */
    }

    /* 确保图片不溢出 */
    .hero-image img,
    .showcase-image img,
    .step-image,
    img {
        max-width: 100%;
        height: auto;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 16px; /* 减少间距 */
        margin-top: 40px;
    }

    .stat-box {
        padding: 20px; /* 减少内边距 */
    }

    .stat-number {
        font-size: 28px; /* 减小字号 */
    }

    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
        padding: 14px 24px; /* 调整按钮大小 */
    }

    /* 基础区块 */
    .section {
        padding: 60px 0; /* 从 80px 减少 */
    }
    
    .section-title {
        font-size: 28px; /* 从 32px 减少 */
        line-height: 1.3;
    }

    .section-desc {
        font-size: 15px;
    }

    .section-header {
        margin-bottom: 40px; /* 减少间距 */
    }

    /* 产品卡片 */
    .products-grid,
    .security-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 24px; /* 减少间距 */
    }

    .product-info {
        padding: 24px; /* 从 32px 减少 */
    }

    .product-name {
        font-size: 24px; /* 减小字号 */
    }

    .product-image-wrapper {
        height: 250px; /* 减小高度 */
    }

    .security-card {
        padding: 28px; /* 从 40px 减少 */
    }

    .security-title {
        font-size: 20px; /* 减小字号 */
    }

    .security-icon {
        width: 60px;
        height: 60px;
        font-size: 28px;
    }

    /* Showcase 和 CTA */
    .showcase,
    .cta {
        padding: 32px 16px; /* 大幅减少内边距 */
        border-radius: 16px; /* 减小圆角 */
    }

    .showcase-content h3 {
        font-size: 26px; /* 从 30px 减少 */
        line-height: 1.3;
    }

    .showcase-content p {
        font-size: 15px;
    }

    .showcase-list li {
        font-size: 15px;
        padding: 12px 0;
    }
    
    .cta h2 {
        font-size: 28px; /* 从 32px 减少 */
        line-height: 1.3;
    }
    
    .cta p {
        font-size: 15px;
        margin-bottom: 28px;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 12px;
    }

    .cta-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    /* Footer */
    .footer {
        padding: 60px 0 30px; /* 减少内边距 */
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .footer-brand h3 {
        font-size: 28px;
    }

    .footer-brand p {
        max-width: 100%; /* 允许全宽 */
        margin-left: auto;
        margin-right: auto;
        font-size: 15px;
    }

    /* Step 布局 */
    .step {
        flex-direction: column;
        gap: 16px;
        align-items: center;
        text-align: center;
        margin-bottom: 40px; /* 减少间距 */
    }

    .step::before {
        display: none;
    }
    
    .step-number {
        width: 64px; /* 减小尺寸 */
        height: 64px;
        font-size: 28px;
    }

    .step-content {
        padding: 20px; /* 从 24px 减少 */
    }
    
    .step-title {
        font-size: 20px; /* 从 22px 减少 */
    }

    .step-desc {
        font-size: 15px;
    }

    .step-tip {
        padding: 12px 16px;
        font-size: 14px;
    }
    
    /* FAQ */
    .faq-question {
        padding: 18px 16px; /* 从 20px 减少 */
        font-size: 15px; /* 从 16px 减少 */
    }

    .faq-answer-content {
        padding: 0 16px 18px; /* 从 20px 减少 */
        font-size: 14px; /* 从 15px 减少 */
    }

    .faq-toggle {
        width: 32px;
        height: 32px;
        font-size: 20px;
    }

    /* 返回顶部按钮 */
    .scroll-top {
        width: 48px;
        height: 48px;
        bottom: 20px;
        right: 20px;
        font-size: 20px;
    }

    /* 画廊 */
    .gallery-item {
        border-radius: 12px; /* 减小圆角 */
    }
}

/* 超小屏幕优化 (425px 及以下) */
@media (max-width: 425px) {
    .container {
        padding: 0 12px;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .section-title {
        font-size: 24px;
    }

    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }
}