* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
        }
        
        body {
            background: #0a0e1a;
            color: #fff;
            line-height: 1.6;
            overflow-x: hidden;
        }
        
        .header {
            background: rgba(10, 14, 26, 0.95);
            padding: 15px 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .logo-container {
            display: flex;
            align-items: center;
        }
        
        .logo {
            height: 48px;
            margin-right: 15px;
            background-color: transparent;
            object-fit: contain;
            width: auto;
        }
        
        .logo-text {
            color: white;
            font-size: 24px;
            font-weight: bold;
            letter-spacing: 1px;
            background: linear-gradient(90deg, #4a8cff, #a45cff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .nav {
            display: flex;
        }
        
        .nav a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            padding: 8px 20px;
            margin: 0 5px;
            border-radius: 20px;
            transition: all 0.3s;
            font-weight: 500;
        }
        
        .nav a:hover {
            background: rgba(74, 140, 255, 0.2);
            color: #4a8cff;
        }
        
        .banner {
            background: radial-gradient(ellipse at top, #0e1a30 0%, #0a0e1a 70%);
            padding: 80px 5%;
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .orb-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: 1;
        }
        
        .orb {
            position: absolute;
            border-radius: 50%;
            z-index: 1;
            transform-origin: center;
            background-size: cover;
            background-position: center;
            opacity: 0.7;
            animation: rotateOrb linear infinite;
        }
        
        .orb-left {
            width: 1200px;
            height: 1200px;
            top: 40%;
            left: -650px;
            animation-duration: 35s;
            background-image: url('http://safeguard-360.cn/images/t018dd1fae1a27d781f.jpg');
        }
        
        .orb-right {
            width: 1100px;
            height: 1100px;
            top: 20%;
            right: -600px;
            animation-duration: 30s;
            animation-direction: reverse;
            background-image: url('http://safeguard-360.cn/images/t018dd1fae1a27d781f.jpg');
            filter: hue-rotate(180deg);
        }
        
        @keyframes rotateOrb {
            0% {
                transform: rotate(0deg);
            }
            100% {
                transform: rotate(360deg);
            }
        }
        
        .banner-content {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
            padding: 20px;
        }
        
        .banner-title {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: 1px;
            background: linear-gradient(90deg, #ffffff, #a45cff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .banner-subtitle {
            font-size: 24px;
            margin-bottom: 40px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            opacity: 0.85;
            color: rgba(255, 255, 255, 0.9);
            line-height: 1.7;
        }
        
        .features {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 50px;
        }
        
        .feature-item {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(5px);
            border-radius: 12px;
            padding: 15px 25px;
            display: flex;
            align-items: center;
            font-size: 18px;
            font-weight: 500;
            z-index: 2;
            position: relative;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.3s;
        }
        
        .feature-item:hover {
            background: rgba(74, 140, 255, 0.15);
            transform: translateY(-3px);
        }
        
        .feature-item i {
            margin-right: 10px;
            font-size: 20px;
            color: #a45cff;
        }
        
        .download-section {
            background: rgba(10, 14, 26, 0.5);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 40px;
            max-width: 800px;
            margin: 0 auto;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(164, 92, 255, 0.2);
            position: relative;
            z-index: 2;
        }
        
        .download-title {
            color: white;
            font-size: 32px;
            margin-bottom: 30px;
            text-align: center;
            font-weight: 700;
        }
        
        .os-selector {
            display: flex;
            justify-content: center;
            margin-bottom: 30px;
            gap: 20px;
        }
        
        .os-tab {
            padding: 15px 40px;
            border-radius: 50px;
            background: rgba(30, 35, 50, 0.8);
            color: rgba(255, 255, 255, 0.7);
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
            border: 2px solid transparent;
            display: flex;
            align-items: center;
            backdrop-filter: blur(5px);
            font-size: 18px;
        }
        
        .os-tab i {
            margin-right: 10px;
            font-size: 24px;
        }
        
        .os-tab.active {
            background: rgba(74, 140, 255, 0.3);
            color: white;
            border-color: rgba(164, 92, 255, 0.5);
            box-shadow: 0 0 20px rgba(74, 140, 255, 0.3);
        }
        
        .os-tab:hover:not(.active) {
            background: rgba(164, 92, 255, 0.2);
        }
        
        .download-info {
            text-align: center;
            margin-bottom: 30px;
            color: rgba(255, 255, 255, 0.85);
            font-size: 18px;
            line-height: 1.6;
        }
        
        .download-btn {
            display: block;
            width: 100%;
            max-width: 400px;
            margin: 0 auto;
            padding: 20px 30px;
            background: linear-gradient(90deg, #ff6b00 0%, #ff8c3a 100%);
            color: white;
            text-align: center;
            font-size: 22px;
            font-weight: 700;
            border-radius: 50px;
            text-decoration: none;
            transition: all 0.3s;
            box-shadow: 0 6px 15px rgba(255, 107, 0, 0.4);
            border: none;
            cursor: pointer;
            position: relative;
            z-index: 2;
        }
        
        .download-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(255, 107, 0, 0.5);
            background: linear-gradient(90deg, #ff8c3a 0%, #ff6b00 100%);
        }
        
        .download-btn:active {
            transform: translateY(1px);
        }
        
        .compatibility {
            text-align: center;
            margin-top: 20px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }
        
        .features-section {
            padding: 100px 5%;
            background: radial-gradient(ellipse at top, #0e1a30 0%, #0a0e1a 70%);
            position: relative;
            z-index: 3;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .section-title {
            text-align: center;
            font-size: 42px;
            color: #ffffff;
            margin-bottom: 70px;
            position: relative;
            font-weight: 700;
        }
        
        .section-title::after {
            content: '';
            display: block;
            width: 100px;
            height: 4px;
            background: linear-gradient(90deg, #ff6b00 0%, #a45cff 100%);
            margin: 20px auto;
            border-radius: 2px;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 35px;
            max-width: 1300px;
            margin: 0 auto;
        }
        
        .feature-card {
            background: rgba(20, 25, 40, 0.7);
            border-radius: 20px;
            padding: 40px 30px;
            text-align: center;
            transition: all 0.4s;
            border: 1px solid rgba(164, 92, 255, 0.1);
            backdrop-filter: blur(5px);
            position: relative;
            overflow: hidden;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
            border-color: rgba(74, 140, 255, 0.3);
        }
        
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, #4a8cff, #a45cff);
        }
        
        .feature-icon {
            width: 90px;
            height: 90px;
            margin: 0 auto 30px;
            background: linear-gradient(135deg, #1a3a5f 0%, #2a1a5f 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 40px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .feature-card h3 {
            font-size: 24px;
            color: #fff;
            margin-bottom: 20px;
            font-weight: 600;
        }
        
        .feature-card p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 17px;
            line-height: 1.7;
        }
        
        .mac-section {
            background: linear-gradient(135deg, #0d1425 0%, #1a1a2e 100%);
            padding: 100px 5%;
            color: white;
            position: relative;
            z-index: 3;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .mac-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 60px;
        }
        
        .mac-content {
            flex: 1;
            min-width: 300px;
        }
        
        .mac-image {
            flex: 1;
            min-width: 300px;
            text-align: center;
            position: relative;
        }
        
        .mac-image::before {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            background: radial-gradient(rgba(164, 92, 255, 0.2), transparent 70%);
            top: 0;
            left: 0;
            z-index: 1;
            border-radius: 20px;
        }
        
        .mac-image img {
            max-width: 100%;
            border-radius: 20px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
            position: relative;
            z-index: 2;
        }
        
        .mac-title {
            font-size: 42px;
            margin-bottom: 30px;
            color: #fff;
            font-weight: 700;
            background: linear-gradient(90deg, #fff, #a45cff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .mac-desc {
            font-size: 18px;
            margin-bottom: 30px;
            opacity: 0.9;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.85);
        }
        
        .mac-features {
            list-style: none;
            margin-bottom: 40px;
        }
        
        .mac-features li {
            padding: 15px 0;
            padding-left: 40px;
            position: relative;
            font-size: 18px;
            color: rgba(255, 255, 255, 0.9);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .mac-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 15px;
            width: 28px;
            height: 28px;
            background: #ff6b00;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 16px;
        }
        
        .footer {
            background: #080b15;
            color: rgba(255, 255, 255, 0.6);
            padding: 60px 5% 40px;
            text-align: center;
            position: relative;
            z-index: 3;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 25px;
            margin-bottom: 30px;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            transition: all 0.3s;
            font-size: 16px;
        }
        
        .footer-links a:hover {
            color: #4a8cff;
        }
        
        .footer p {
            margin: 10px 0;
            font-size: 14px;
        }
        
        .structured-data {
            display: none;
        }
        
        @media (max-width: 992px) {
            .banner-title {
                font-size: 38px;
            }
            
            .banner-subtitle {
                font-size: 20px;
            }
            
            .download-section {
                padding: 30px;
            }
            
            .os-tab {
                padding: 12px 30px;
            }
            
            .feature-card {
                padding: 30px 20px;
            }
            
            .mac-container {
                flex-direction: column;
                text-align: center;
            }
            
            .mac-features li {
                padding-left: 0;
                text-align: left;
                padding-right: 20px;
            }
            
            .mac-features li::before {
                left: -10px;
            }
        }
        
        @media (max-width: 768px) {
            .banner {
                min-height: auto;
                padding: 60px 5%;
            }
            
            .banner-title {
                font-size: 32px;
            }
            
            .banner-subtitle {
                font-size: 18px;
            }
            
            .download-section {
                padding: 25px;
            }
            
            .os-selector {
                flex-direction: column;
                align-items: center;
            }
            
            .os-tab {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
            
            .section-title {
                font-size: 36px;
                margin-bottom: 50px;
            }
            
            .orb-left {
                width: 900px;
                height: 900px;
                top: 30%;
                left: -500px;
            }
            
            .orb-right {
                width: 800px;
                height: 800px;
                top: 15%;
                right: -450px;
            }
        }
        
        @media (max-width: 480px) {
            .banner-title {
                font-size: 28px;
            }
            
            .nav a {
                padding: 6px 12px;
                font-size: 14px;
            }
            
            .logo-text {
                font-size: 20px;
            }
            
            .feature-item {
                padding: 12px 20px;
                font-size: 16px;
            }
            
            .orb-left {
                width: 700px;
                height: 700px;
                top: 35%;
                left: -450px;
            }
            
            .orb-right {
                width: 650px;
                height: 650px;
                top: 10%;
                right: -400px;
            }
        }