:root {
            --bg-deep: #05070e;
            --surface-card: #0e1322;
            --surface-hover: #151d33;
            --border-glow: rgba(124, 77, 255, 0.25);
            --accent-purple: #7c4dff;
            --accent-pink: #ff4081;
            --accent-cyan: #00e5ff;
            --accent-emerald: #00e676;
            --accent-amber: #ffab00;
            --text-primary: #f8fafc;
            --text-secondary: #94a3b8;
            --gradient-aurora: linear-gradient(135deg, #7c4dff 0%, #ff4081 50%, #00e5ff 100%);
            --gradient-ai: linear-gradient(135deg, #00e5ff 0%, #7c4dff 50%, #00e676 100%);
            --gradient-dark-card: linear-gradient(180deg, rgba(21, 29, 51, 0.6) 0%, rgba(14, 19, 34, 0.8) 100%);
            --glow-purple: 0 0 24px rgba(124, 77, 255, 0.4);
            --glow-cyan: 0 0 24px rgba(0, 229, 255, 0.4);
            --glow-pink: 0 0 24px rgba(255, 64, 129, 0.4);
            --glow-emerald: 0 0 24px rgba(0, 230, 118, 0.4);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'PingFang SC', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
        }

        body {
            background-color: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
            background-image:
                radial-gradient(circle at 10% 30%, rgba(124, 77, 255, 0.10) 0%, transparent 50%),
                radial-gradient(circle at 90% 70%, rgba(0, 229, 255, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 50% 50%, rgba(255, 64, 129, 0.04) 0%, transparent 55%);
            background-attachment: fixed;
        }

        /* ========== Header（与首页一致） ========== */
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 6%;
            position: sticky;
            top: 0;
            background: rgba(5, 7, 14, 0.85);
            backdrop-filter: blur(16px);
            z-index: 100;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 24px;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: var(--gradient-aurora);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            white-space: nowrap;
        }

        .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--gradient-aurora);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #05070e;
            font-weight: 900;
            font-size: 18px;
            -webkit-text-fill-color: initial;
            flex-shrink: 0;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 32px;
        }

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

        nav a:hover,
        nav a.active {
            color: var(--text-primary);
            text-shadow: 0 0 12px rgba(124, 77, 255, 0.6);
        }

        nav a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
        }

        .nav-btn {
            background: var(--gradient-aurora);
            color: #ffffff;
            padding: 10px 24px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 700;
            text-decoration: none;
            box-shadow: 0 4px 20px rgba(124, 77, 255, 0.35);
            transition: transform 0.3s, box-shadow 0.3s;
            white-space: nowrap;
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(255, 40, 129, 0.5);
        }

        /* ========== Hero 区域：AI智能下载引导 ========== */
        .download-hero {
            padding: 80px 6% 50px;
            text-align: center;
            max-width: 1100px;
            margin: 0 auto;
            position: relative;
        }

        .ai-detect-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            border-radius: 24px;
            background: rgba(0, 230, 118, 0.08);
            border: 1px solid rgba(0, 230, 118, 0.3);
            color: var(--accent-emerald);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
            animation: detectPulse 2.5s ease-in-out infinite;
        }

        .ai-detect-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent-emerald);
            box-shadow: 0 0 10px var(--accent-emerald);
            animation: dotBlink 1.5s ease-in-out infinite;
        }

        @keyframes detectPulse {
            0%,
            100% {
                box-shadow: 0 0 10px rgba(0, 230, 118, 0.2);
            }
            50% {
                box-shadow: 0 0 22px rgba(0, 230, 118, 0.5);
            }
        }

        @keyframes dotBlink {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.3;
                transform: scale(1.8);
            }
        }

        .download-hero h1 {
            font-size: 52px;
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 18px;
            letter-spacing: -1px;
        }

        .download-hero h1 span {
            background: var(--gradient-ai);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .download-hero .hero-subtitle {
            font-size: 19px;
            color: var(--text-secondary);
            max-width: 700px;
            margin: 0 auto 36px;
            font-weight: 300;
            line-height: 1.7;
        }

        .hero-highlights {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .hero-highlight-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
            padding: 10px 18px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 30px;
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: all 0.3s;
        }

        .hero-highlight-item:hover {
            border-color: var(--accent-cyan);
            color: var(--text-primary);
            box-shadow: var(--glow-cyan);
        }

        .hero-highlight-item .hl-icon {
            font-size: 18px;
        }

        /* ========== 创意版块1：智能设备识别 + 全平台下载卡片 ========== */
        .download-section {
            padding: 40px 6% 60px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-title h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 10px;
            letter-spacing: -0.5px;
        }

        .section-title h2 .highlight {
            background: var(--gradient-ai);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .section-title p {
            color: var(--text-secondary);
            font-size: 15px;
            max-width: 600px;
            margin: 0 auto;
        }

        .download-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-bottom: 50px;
        }

        .download-card {
            background: var(--gradient-dark-card);
            border: 1px solid rgba(255, 255, 255, 0.07);
            border-radius: 20px;
            padding: 32px 26px 26px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all 0.35s ease;
            position: relative;
            overflow: hidden;
        }

        .download-card::after {
            content: '';
            position: absolute;
            bottom: -30px;
            right: -30px;
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(124, 77, 255, 0.1) 0%, transparent 70%);
            pointer-events: none;
            transition: all 0.4s;
        }

        .download-card:hover::after {
            width: 180px;
            height: 180px;
            bottom: -60px;
            right: -60px;
        }

        .download-card.recommended {
            border-color: var(--accent-pink);
            box-shadow: 0 8px 30px rgba(255, 40, 129, 0.12);
        }

        .download-card.recommended::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--gradient-aurora);
            z-index: 1;
        }

        .recommended-badge {
            position: absolute;
            top: 14px;
            right: -30px;
            background: var(--gradient-aurora);
            color: #fff;
            font-size: 10px;
            font-weight: 800;
            padding: 3px 32px;
            transform: rotate(45deg);
            text-transform: uppercase;
            letter-spacing: 1.5px;
            z-index: 2;
            box-shadow: 0 2px 12px rgba(255, 40, 129, 0.4);
        }

        .download-card:hover {
            transform: translateY(-8px);
            border-color: var(--accent-cyan);
            box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 229, 255, 0.15);
        }

        .card-header-os {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 18px;
            position: relative;
            z-index: 1;
        }

        .os-icon {
            font-size: 40px;
            flex-shrink: 0;
            transition: transform 0.3s;
        }

        .download-card:hover .os-icon {
            transform: scale(1.1);
        }

        .os-info h2 {
            font-size: 21px;
            font-weight: 700;
        }

        .os-info .version {
            font-size: 12px;
            color: var(--accent-cyan);
            font-weight: 500;
            letter-spacing: 0.5px;
        }

        .os-info .version .tag-new {
            display: inline-block;
            background: rgba(0, 230, 118, 0.2);
            color: var(--accent-emerald);
            font-size: 10px;
            padding: 1px 7px;
            border-radius: 8px;
            margin-left: 6px;
            font-weight: 700;
            animation: newPulse 2s ease-in-out infinite;
        }

        @keyframes newPulse {
            0%,
            100% {
                opacity: 0.7;
            }
            50% {
                opacity: 1;
            }
        }

        .os-meta {
            list-style: none;
            margin-bottom: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 14px;
            position: relative;
            z-index: 1;
        }

        .os-meta li {
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 7px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .os-meta li span.val {
            color: var(--text-primary);
            font-weight: 500;
            font-size: 12px;
        }

        .btn-download {
            display: block;
            text-align: center;
            background: var(--gradient-aurora);
            color: #ffffff;
            padding: 14px 20px;
            border-radius: 12px;
            font-size: 15px;
            font-weight: 700;
            text-decoration: none;
            box-shadow: 0 6px 20px rgba(124, 77, 255, 0.3);
            transition: all 0.3s;
            position: relative;
            z-index: 1;
            letter-spacing: 0.3px;
        }

        .btn-download:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(255, 40, 129, 0.5);
        }

        .btn-download-sub {
            display: block;
            text-align: center;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-primary);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 11px;
            border-radius: 12px;
            font-size: 13px;
            font-weight: 600;
            text-decoration: none;
            margin-top: 10px;
            transition: all 0.3s;
            position: relative;
            z-index: 1;
        }

        .btn-download-sub:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.25);
        }

        .file-hash {
            font-size: 10px;
            color: var(--text-secondary);
            text-align: center;
            margin-top: 10px;
            opacity: 0.6;
            position: relative;
            z-index: 1;
            letter-spacing: 0.5px;
            word-break: break-all;
        }

        /* ========== 创意版块2：安全纯净认证区 ========== */
        .safety-cert-section {
            padding: 60px 6%;
            max-width: 1100px;
            margin: 0 auto;
        }

        .safety-cert-inner {
            background: var(--surface-card);
            border: 1px solid rgba(255, 255, 255, 0.07);
            border-radius: 20px;
            padding: 40px 36px;
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
            align-items: center;
            position: relative;
            overflow: hidden;
        }

        .safety-cert-inner::before {
            content: '';
            position: absolute;
            top: -50px;
            left: -50px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 230, 118, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .safety-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            position: relative;
            z-index: 1;
        }

        .safety-badge {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 14px 18px;
            background: rgba(14, 19, 34, 0.7);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 12px;
            transition: all 0.3s;
            flex: 1 1 180px;
            min-width: 160px;
        }

        .safety-badge:hover {
            border-color: var(--accent-emerald);
            box-shadow: var(--glow-emerald);
            background: rgba(0, 230, 118, 0.04);
        }

        .safety-badge .sb-icon {
            font-size: 24px;
            flex-shrink: 0;
        }

        .safety-badge .sb-text h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 2px;
        }

        .safety-badge .sb-text p {
            font-size: 11px;
            color: var(--text-secondary);
            line-height: 1.4;
        }

        .safety-info {
            position: relative;
            z-index: 1;
        }

        .safety-info h3 {
            font-size: 26px;
            font-weight: 800;
            margin-bottom: 14px;
            line-height: 1.3;
        }

        .safety-info h3 .glow-text {
            background: var(--gradient-ai);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .safety-info p {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .safety-info .hash-display {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 16px;
            background: rgba(0, 0, 0, 0.3);
            border-radius: 8px;
            font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
            font-size: 11px;
            color: var(--accent-cyan);
            word-break: break-all;
            border: 1px solid rgba(0, 229, 255, 0.15);
        }

        /* ========== 创意版块3：一键部署流程可视化 ========== */
        .deploy-flow-section {
            padding: 60px 6%;
            max-width: 1100px;
            margin: 0 auto;
        }

        .deploy-steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0;
            position: relative;
        }

        .deploy-steps::before {
            content: '';
            position: absolute;
            top: 44px;
            left: 16%;
            width: 68%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan), var(--accent-emerald));
            z-index: 0;
            opacity: 0.5;
            border-radius: 2px;
        }

        .deploy-step {
            text-align: center;
            position: relative;
            z-index: 1;
            padding: 20px;
        }

        .step-circle {
            width: 88px;
            height: 88px;
            border-radius: 50%;
            margin: 0 auto 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 36px;
            position: relative;
            transition: all 0.4s;
        }

        .step-circle.step-download {
            border: 2px solid var(--accent-purple);
            box-shadow: 0 0 22px rgba(124, 77, 255, 0.35);
            background: rgba(124, 77, 255, 0.08);
        }
        .step-circle.step-install {
            border: 2px solid var(--accent-cyan);
            box-shadow: 0 0 22px rgba(0, 229, 255, 0.35);
            background: rgba(0, 229, 255, 0.08);
        }
        .step-circle.step-connect {
            border: 2px solid var(--accent-emerald);
            box-shadow: 0 0 22px rgba(0, 230, 118, 0.35);
            background: rgba(0, 230, 118, 0.08);
        }

        .deploy-step:hover .step-circle {
            transform: scale(1.1);
        }

        .deploy-step h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .deploy-step p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.5;
            max-width: 220px;
            margin: 0 auto;
        }

        .step-number {
            position: absolute;
            top: -6px;
            right: -6px;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: var(--gradient-aurora);
            color: #fff;
            font-size: 11px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ========== 创意版块4：全球CDN加速下载节点 ========== */
        .cdn-nodes-section {
            padding: 60px 6%;
            max-width: 1100px;
            margin: 0 auto;
        }

        .cdn-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .cdn-card {
            background: var(--surface-card);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 14px;
            padding: 22px 18px;
            text-align: center;
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
        }

        .cdn-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4);
            transform: translateY(-3px);
        }

        .cdn-flag {
            font-size: 36px;
            margin-bottom: 10px;
        }

        .cdn-card h4 {
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 4px;
        }

        .cdn-speed {
            font-size: 20px;
            font-weight: 800;
            color: var(--accent-emerald);
        }

        .cdn-sub {
            font-size: 11px;
            color: var(--text-secondary);
            margin-top: 2px;
        }

        .cdn-status {
            display: inline-block;
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--accent-emerald);
            margin-right: 4px;
            animation: dotBlink 2s ease-in-out infinite;
        }

        /* ========== 跨平台特性区 ========== */
        .cross-platform-features {
            background: var(--surface-card);
            border: 1px solid rgba(255, 255, 255, 0.07);
            border-radius: 18px;
            padding: 32px 28px;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .feature-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }

        .feature-icon-box {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: rgba(124, 77, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
            color: var(--accent-cyan);
            transition: all 0.3s;
        }

        .feature-item:hover .feature-icon-box {
            background: rgba(0, 229, 255, 0.18);
            box-shadow: var(--glow-cyan);
        }

        .feature-text h3 {
            font-size: 15px;
            margin-bottom: 4px;
            color: var(--text-primary);
            font-weight: 700;
        }

        .feature-text p {
            font-size: 12px;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ========== Footer（与首页一致） ========== */
        footer {
            background: #030408;
            padding: 60px 6% 30px;
            color: var(--text-secondary);
            font-size: 14px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 50px;
            margin-bottom: 50px;
        }

        .footer-brand h3 {
            color: var(--text-primary);
            font-size: 20px;
            margin-bottom: 16px;
        }

        .footer-brand p {
            line-height: 1.8;
            font-size: 13px;
        }

        .footer-col h4 {
            color: var(--text-primary);
            font-size: 16px;
            margin-bottom: 20px;
        }

        .footer-col ul {
            list-style: none;
        }

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

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

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 25px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            flex-wrap: wrap;
            gap: 12px;
        }

        /* ========== 响应式适配 ========== */
        @media (max-width: 1024px) {
            .download-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .cdn-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .safety-cert-inner {
                grid-template-columns: 1fr;
                gap: 24px;
                padding: 30px 24px;
            }
            .deploy-steps::before {
                display: none;
            }
            .deploy-steps {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .download-hero h1 {
                font-size: 38px;
            }
            .cross-platform-features {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 900px) {
            .download-grid {
                grid-template-columns: 1fr 1fr;
            }
            .cdn-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            nav ul {
                display: none;
            }
            .hero-highlights {
                gap: 16px;
            }
            .hero-highlight-item {
                font-size: 12px;
                padding: 8px 14px;
            }
        }

        @media (max-width: 600px) {
            .download-grid {
                grid-template-columns: 1fr;
            }
            .cdn-grid {
                grid-template-columns: 1fr 1fr;
            }
            .cross-platform-features {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .download-hero h1 {
                font-size: 28px;
            }
            .download-hero .hero-subtitle {
                font-size: 15px;
            }
            .section-title h2 {
                font-size: 24px;
            }
            .safety-badges {
                flex-direction: column;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .deploy-steps {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }