/* —— 深色科技风 · 极简转化 · 与首页决策宇宙统一 —— */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            background: #0a0f1a;
            color: #e3e9f5;
            font-family: 'Inter', 'SF Mono', 'Menlo', 'Monaco', 'Cascadia Code', 'Consolas', monospace;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }

        body::before {
            content: "";
            position: fixed;
            top: 0; left: 0; width: 100%; height: 100%;
            background-image: 
                linear-gradient(rgba(16, 185, 129, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(16, 185, 129, 0.04) 1px, transparent 1px);
            background-size: 48px 48px;
            pointer-events: none;
            z-index: 0;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            z-index: 2;
        }

        /* ----- 导航栏 (与首页修改版一致) ----- */
        header {
            background: rgba(8, 14, 23, 0.85);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid #1e3a5f;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 12px 0;
        }

        .logo-area h1 {
            font-size: 1.9rem;
            font-weight: 700;
            background: linear-gradient(135deg, #a0e9ff, #4f9cf7, #6ee7b7);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
            text-shadow: 0 0 12px rgba(37,99,235,0.3);
        }

        .logo-area p {
            font-size: 0.7rem;
            color: #7f9bc2;
            margin-top: 4px;
            font-weight: 400;
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        .nav-links {
            display: flex;
            gap: 1.8rem;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: #b0caf0;
            transition: all 0.15s;
            font-size: 0.9rem;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            font-family: inherit;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: #6ee7b7;
            border-bottom-color: #2dd4bf;
            text-shadow: 0 0 6px #14b8a6;
        }

        /* ----- 第一屏 · 极简下载核心 ----- */
        .download-hero {
            text-align: center;
            padding: 56px 0 20px;
        }

        .badge-minimal {
            display: inline-block;
            background: #0f2840;
            color: #7ad0ff;
            padding: 6px 20px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            border: 1px solid #2d5f8b;
            backdrop-filter: blur(4px);
            margin-bottom: 24px;
        }

        .download-hero h2 {
            font-size: 3.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #c4e6ff, #7dd3fc, #6ee7b7);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            line-height: 1.1;
            margin-bottom: 20px;
            text-shadow: 0 0 30px #0e7490;
        }

        .hero-remark {
            color: #9ab3d0;
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 30px;
            border-left: 3px solid #2dd4bf;
            padding-left: 22px;
            text-align: left;
            background: #0e1a26b0;
            border-radius: 0 40px 40px 0;
            backdrop-filter: blur(4px);
        }

        /* 三大下载卡片 (极简转化) */
        .os-download-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 24px;
            margin: 40px 0 30px;
        }

        .os-card {
            background: rgba(12, 22, 34, 0.7);
            backdrop-filter: blur(12px);
            border: 1px solid #1e405b;
            border-radius: 42px;
            padding: 40px 36px;
            flex: 1 1 220px;
            max-width: 280px;
            text-align: center;
            box-shadow: 0 20px 30px -10px #0000004d, 0 0 0 1px #1e497033 inset;
            transition: 0.2s;
        }

        .os-card:hover {
            border-color: #2dd4bf;
            box-shadow: 0 0 32px #14b8a640, 0 0 0 1px #2dd4bf inset;
            transform: translateY(-6px);
        }

        .os-icon {
            font-size: 3.8rem;
            margin-bottom: 16px;
            filter: drop-shadow(0 0 14px #38bdf8);
        }

        .os-card h3 {
            font-size: 2.2rem;
            font-weight: 700;
            color: #e0f2fe;
            margin-bottom: 10px;
        }

        .arch-tag {
            display: inline-block;
            background: #1e4b6e;
            color: #a5f3fc;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.8rem;
            margin-bottom: 24px;
            border: 1px solid #2e7a9c;
        }

        .download-btn {
            background: transparent;
            border: 2px solid #2dd4bf;
            color: #b9f3f0;
            padding: 14px 26px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.2rem;
            cursor: pointer;
            transition: 0.2s;
            box-shadow: 0 0 18px #14b8a6;
            backdrop-filter: blur(8px);
            width: 100%;
            display: inline-block;
            text-decoration: none;
        }

        .download-btn:hover {
            background: #14b8a6;
            color: #020c14;
            border-color: #a5f3fc;
            box-shadow: 0 0 40px #2dd4bf;
        }

        /* 第二屏 · 安全极简区 */
        .security-brief {
            background: #0e1a26e0;
            backdrop-filter: blur(8px);
            border: 1px solid #1f4a66;
            border-radius: 48px;
            padding: 32px 36px;
            margin: 50px 0 30px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .security-left h3 {
            font-size: 1.8rem;
            font-weight: 650;
            color: #c6e2ff;
            margin-bottom: 8px;
        }

        .hash-badge {
            background: #0f2a40;
            padding: 8px 18px;
            border-radius: 40px;
            font-family: monospace;
            color: #9cc9ff;
            border: 1px solid #2d7a9c;
        }

        .security-right {
            display: flex;
            gap: 12px;
        }

        .pill-link {
            background: transparent;
            border: 1px solid #2e7a9c;
            color: #b0d4fc;
            padding: 8px 20px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 500;
            transition: 0.15s;
        }

        .pill-link:hover {
            background: #1e4f7a;
            border-color: #6ee7b7;
        }

        /* 校验卡片简洁 */
        .checksum-mini {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
            background: #0b1621d0;
            border-radius: 30px;
            padding: 20px 30px;
            border: 1px solid #1e4970;
            margin: 20px 0 40px;
            backdrop-filter: blur(4px);
        }

        .checksum-mini span {
            font-family: 'SF Mono', monospace;
        }

        /* 底部号召 (返回下载核心) */
        .cta-download-bottom {
            background: #07131e;
            border-radius: 48px;
            padding: 48px 30px;
            margin: 60px 0 40px;
            text-align: center;
            border: 1px solid #1a4b6d;
            box-shadow: 0 0 35px #00000099, inset 0 0 30px #0a1e2e;
        }

        .cta-download-bottom h3 {
            font-size: 2.4rem;
            font-weight: 750;
            color: #d6ecff;
            margin-bottom: 16px;
        }

        .btn-cyber-large {
            background: transparent;
            border: 2px solid #2dd4bf;
            color: #b9f3f0;
            padding: 18px 60px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.5rem;
            text-decoration: none;
            display: inline-block;
            box-shadow: 0 0 28px #14b8a6;
            backdrop-filter: blur(8px);
            cursor: pointer;
        }

        .btn-cyber-large:hover {
            background: #14b8a6;
            color: #020c14;
        }

        /* footer (与首页一致) */
        footer {
            background: #050b12f0;
            backdrop-filter: blur(8px);
            color: #9bb9da;
            padding: 40px 0 24px;
            margin-top: 40px;
            border-top: 1px solid #153e5a;
        }

        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
        }

        .footer-copyright {
            text-align: center;
            padding-top: 28px;
            font-size: 0.85rem;
            border-top: 1px solid #1a405a;
            margin-top: 20px;
        }

        a {
            color: #b0d4fc;
            text-decoration: none;
        }

        /* 响应式 */
        @media (max-width: 700px) {
            .download-hero h2 {
                font-size: 2.6rem;
            }
            .os-download-grid {
                flex-direction: column;
                align-items: center;
            }
            .os-card {
                max-width: 100%;
                width: 100%;
            }
        }
        .cursor-blink {
            display: inline-block;
            width: 10px;
            height: 1.2rem;
            background: #2dd4bf;
            margin-left: 6px;
            animation: blink 1s infinite;
        }
        @keyframes blink { 0%,100%{opacity:1;} 50%{opacity:0;} }