/* ===== SafeW 下载页 创意 CSS ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #0b0713;
            color: #ffffff;
            line-height: 1.6;
            overflow-x: hidden;
            background-image:
                radial-gradient(ellipse 60% 40% at 15% 0%, rgba(124, 58, 237, 0.22), transparent 60%),
                radial-gradient(ellipse 50% 35% at 85% 10%, rgba(59, 130, 246, 0.18), transparent 60%),
                radial-gradient(ellipse 40% 30% at 50% 100%, rgba(168, 85, 247, 0.08), transparent 70%);
            background-repeat: no-repeat;
            background-attachment: fixed;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* 头部与导航（与首页一致） */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 7, 19, 0.8);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
            gap: 32px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            flex-shrink: 0;
            letter-spacing: -0.5px;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, #a855f7, #6366f1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: 0 8px 24px rgba(168, 85, 247, 0.4);
            transition: transform 0.3s ease;
        }
        .logo:hover .logo-icon {
            transform: rotate(-5deg) scale(1.05);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 28px;
            font-size: 15px;
            color: #cbd5e1;
        }
        .main-nav a {
            position: relative;
            transition: color 0.2s;
            font-weight: 500;
            letter-spacing: 0.3px;
        }
        .main-nav a:hover {
            color: #ffffff;
        }
        .main-nav a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -6px;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #a855f7, #3b82f6);
            transition: width 0.3s cubic-bezier(0.22, 1, 0.36, 1);
            border-radius: 2px;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .main-nav a.active-nav {
            color: #ffffff;
        }
        .main-nav a.active-nav::after {
            width: 100%;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }
        .lang-select {
            font-size: 14px;
            color: #cbd5e1;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 999px;
            font-weight: 600;
            transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-small {
            padding: 10px 20px;
            font-size: 14px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.18);
            color: #fff;
            backdrop-filter: blur(8px);
        }
        .btn-small:hover {
            background: rgba(255, 255, 255, 0.18);
            transform: translateY(-1px);
        }
        .btn-primary {
            padding: 14px 30px;
            font-size: 16px;
            background: linear-gradient(135deg, #a855f7, #3b82f6);
            border: none;
            color: #fff;
            box-shadow: 0 12px 28px rgba(124, 58, 237, 0.45);
            position: relative;
            overflow: hidden;
        }
        .btn-primary::before {
            content: "";
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.6s;
        }
        .btn-primary:hover::before {
            left: 100%;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 18px 38px rgba(124, 58, 237, 0.55);
        }
        .btn-secondary {
            padding: 14px 28px;
            font-size: 16px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            backdrop-filter: blur(8px);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.14);
            transform: translateY(-2px);
        }
        /* 下载页面特定样式 */
        .section-heading {
            max-width: 700px;
            margin: 0 auto 50px;
            text-align: center;
        }
        .section-heading h2 {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
            line-height: 1.3;
        }
        .section-heading p {
            color: #94a3b8;
            font-size: 16px;
        }
        .download-hero {
            padding: 90px 0 70px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .download-hero::after {
            content: "";
            position: absolute;
            bottom: -100px;
            left: 50%;
            transform: translateX(-50%);
            width: 700px;
            height: 250px;
            background: radial-gradient(ellipse, rgba(168,85,247,0.15), transparent 70%);
            pointer-events: none;
        }
        .hero-badge-download {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            border-radius: 999px;
            background: rgba(168, 85, 247, 0.12);
            border: 1px solid rgba(168, 85, 247, 0.35);
            font-size: 13px;
            color: #d8b4fe;
            margin-bottom: 24px;
            letter-spacing: 0.5px;
            animation: float 4s ease-in-out infinite;
        }
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }
        .hero-badge-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #10b981;
            box-shadow: 0 0 14px rgba(16, 185, 129, 0.9);
        }
        .download-hero h1 {
            font-size: clamp(2.4rem, 5.5vw, 4rem);
            font-weight: 900;
            line-height: 1.2;
            letter-spacing: -1px;
            margin-bottom: 18px;
        }
        .gradient-text {
            background: linear-gradient(90deg, #c084fc, #60a5fa, #a855f7);
            background-size: 200% auto;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: gradientShift 4s ease-in-out infinite;
        }
        @keyframes gradientShift {
            0%, 100% { background-position: 0% center; }
            50% { background-position: 100% center; }
        }
        .download-hero .sub-desc {
            max-width: 700px;
            margin: 0 auto 40px;
            color: #a0aec0;
            font-size: 17px;
            line-height: 1.8;
        }
        .platform-quick-icons {
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 30px;
        }
        .platform-quick-icon {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            transition: all 0.3s;
            cursor: default;
        }
        .platform-quick-icon:hover {
            transform: translateY(-5px);
            background: rgba(255,255,255,0.12);
            box-shadow: 0 12px 24px rgba(0,0,0,0.4);
        }
        /* 平台卡片网格 */
        .platform-grid-section {
            padding: 60px 0;
        }
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
            gap: 24px;
        }
        .platform-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.09);
            border-radius: 24px;
            padding: 32px 20px 24px;
            text-align: center;
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
            backdrop-filter: blur(8px);
        }
        .platform-card:hover {
            transform: translateY(-8px);
            border-color: rgba(255, 255, 255, 0.25);
            background: rgba(255, 255, 255, 0.07);
            box-shadow: 0 20px 40px rgba(0,0,0,0.4);
        }
        .platform-card::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -20%;
            width: 150px;
            height: 150px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(168, 85, 247, 0.25), transparent 70%);
            pointer-events: none;
        }
        .platform-card-icon {
            font-size: 44px;
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }
        .platform-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 8px;
            position: relative;
            z-index: 1;
        }
        .platform-card .platform-version {
            color: #94a3b8;
            font-size: 13px;
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }
        .platform-card .platform-size {
            color: #64748b;
            font-size: 12px;
            margin-bottom: 20px;
            position: relative;
            z-index: 1;
        }
        .platform-card .btn-download {
            display: inline-block;
            padding: 10px 24px;
            border-radius: 999px;
            background: rgba(168,85,247,0.15);
            border: 1px solid rgba(168,85,247,0.4);
            color: #d8b4fe;
            font-weight: 600;
            font-size: 14px;
            transition: all 0.3s;
            position: relative;
            z-index: 1;
        }
        .platform-card .btn-download:hover {
            background: rgba(168,85,247,0.3);
            border-color: #a855f7;
            color: #fff;
            box-shadow: 0 8px 16px rgba(168,85,247,0.3);
        }
        /* 特色亮点 */
        .features-download {
            padding: 80px 0;
            background: rgba(255,255,255,0.02);
            border-top: 1px solid rgba(255,255,255,0.06);
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .features-grid-download {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 40px;
        }
        .feature-item-download {
            background: rgba(255,255,255,0.03);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: 20px;
            padding: 28px 22px;
            transition: all 0.3s;
        }
        .feature-item-download:hover {
            background: rgba(255,255,255,0.06);
            border-color: rgba(255,255,255,0.2);
            transform: translateY(-4px);
        }
        .feature-item-download .icon {
            font-size: 30px;
            margin-bottom: 16px;
        }
        .feature-item-download h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .feature-item-download p {
            font-size: 14px;
            color: #94a3b8;
        }
        /* 安装步骤 */
        .install-steps {
            padding: 80px 0;
        }
        .steps-timeline {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            margin-top: 40px;
            flex-wrap: wrap;
        }
        .step-card {
            flex: 1;
            min-width: 200px;
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: 20px;
            padding: 28px 22px;
            text-align: center;
            position: relative;
            transition: all 0.3s;
        }
        .step-card:hover {
            background: rgba(255,255,255,0.07);
            border-color: rgba(255,255,255,0.2);
            transform: translateY(-5px);
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, #a855f7, #6366f1);
            font-weight: 800;
            font-size: 20px;
            margin-bottom: 16px;
            box-shadow: 0 8px 16px rgba(124,58,237,0.4);
        }
        .step-card h3 {
            font-size: 18px;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 14px;
            color: #94a3b8;
        }
        /* 安全验证区 */
        .security-verify {
            padding: 80px 0;
            background: linear-gradient(135deg, rgba(168,85,247,0.05), rgba(59,130,246,0.05));
            border-radius: 32px;
            max-width: 1000px;
            margin: 0 auto 80px;
        }
        .security-verify .container {
            display: flex;
            gap: 40px;
            align-items: center;
            flex-wrap: wrap;
        }
        .verify-left {
            flex: 1;
            min-width: 280px;
        }
        .verify-left h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .verify-left p {
            color: #94a3b8;
            margin-bottom: 20px;
        }
        .verify-right {
            flex: 1;
            min-width: 280px;
            background: rgba(0,0,0,0.3);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 20px;
            padding: 30px;
        }
        .hash-box {
            font-family: 'Courier New', monospace;
            font-size: 13px;
            background: rgba(0,0,0,0.4);
            padding: 12px;
            border-radius: 10px;
            border: 1px dashed rgba(255,255,255,0.15);
            word-break: break-all;
            color: #cbd5e1;
            margin-top: 10px;
        }
        /* 企业部署 */
        .enterprise-download {
            padding: 70px 0;
            text-align: center;
        }
        .enterprise-download h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .enterprise-download p {
            color: #94a3b8;
            max-width: 650px;
            margin: 0 auto 30px;
        }
        /* 响应式 */
        @media (max-width: 992px) {
            .main-nav { display: none; }
            .features-grid-download { grid-template-columns: repeat(2,1fr); }
            .steps-timeline { flex-direction: column; }
            .security-verify .container { flex-direction: column; }
        }
        @media (max-width: 640px) {
            .features-grid-download { grid-template-columns: 1fr; }
            .platform-grid { grid-template-columns: repeat(2,1fr); }
            .download-hero { padding: 60px 0 50px; }
            .download-hero h1 { font-size: 2.2rem; }
        }
        /* 页脚 */
        .site-footer {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            background: #08050d;
            padding: 60px 0 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 50px;
        }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p { color: #94a3b8; font-size: 14px; max-width: 260px; }
        .footer-col h4 { font-size: 15px; font-weight: 700; margin-bottom: 18px; }
        .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
        .footer-col ul li, .footer-col ul li a { font-size: 14px; color: #94a3b8; transition: color 0.2s; }
        .footer-col ul li a:hover { color: #ffffff; }
        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 13px;
            color: #64748b;
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 480px) {
            .footer-grid { grid-template-columns: 1fr; }
        }