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

        body {
            font-family: system-ui, -apple-system, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
            background: linear-gradient(145deg, #f6f9fc 0%, #eef2f5 100%);
            color: #1a2c3e;
            line-height: 1.6;
            scroll-behavior: smooth;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        /* Header 与首页完全一致 */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
        }

        .navbar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 0;
            gap: 1rem;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .logo-svg {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .logo-text {
            font-size: 1.8rem;
            font-weight: 700;
            background: linear-gradient(135deg, #0f2b3d, #1e4a6e);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.3px;
        }

        .badge {
            font-size: 0.7rem;
            background: #eef2ff;
            padding: 0.2rem 0.6rem;
            border-radius: 30px;
            color: #1e4a6e;
            font-weight: 500;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
            flex-wrap: wrap;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #2c4c6c;
            transition: color 0.2s;
            font-size: 1rem;
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: #0f6b9c;
            border-bottom: 2px solid #0f6b9c;
            padding-bottom: 0.25rem;
        }

        /* Hero 区域 */
        .download-hero {
            padding: 4rem 0 2rem;
            text-align: center;
        }

        .download-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(125deg, #0a2e42, #1f6390);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }

        .download-hero .subtitle {
            font-size: 1.1rem;
            color: #3a627c;
            max-width: 700px;
            margin: 0 auto 1.5rem;
            font-weight: 450;
        }

        .architecture-badges {
            display: flex;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
            margin-top: 0.5rem;
        }

        .arch-badge {
            background: rgba(255, 255, 255, 0.7);
            border: 1px solid rgba(0, 0, 0, 0.06);
            border-radius: 2rem;
            padding: 0.4rem 1.2rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: #1e5a7a;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }

        /* 下载卡片区域 */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            padding: 2rem 0 3rem;
        }

        .download-card {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(4px);
            border-radius: 2rem;
            padding: 2.2rem 1.8rem;
            box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s;
            border: 1px solid rgba(255, 255, 255, 0.6);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .download-card::after {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            opacity: 0.06;
            pointer-events: none;
            transition: all 0.3s;
        }

        .download-card.silicon::after { background: #7c3aed; }
        .download-card.intel::after { background: #2563eb; }
        .download-card.meta::after { background: #059669; }
        .download-card.legacy::after { background: #b45389; }

        .download-card:hover {
            transform: translateY(-8px);
            background: white;
            box-shadow: 0 28px 40px -14px rgba(0, 0, 0, 0.14);
        }

        .download-card:hover::after {
            opacity: 0.1;
            width: 160px;
            height: 160px;
            top: -60px;
            right: -60px;
        }

        .card-badge {
            display: inline-block;
            padding: 0.3rem 1rem;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 1rem;
        }

        .silicon .card-badge { background: #f3eeff; color: #6d3fd6; }
        .intel .card-badge { background: #eef4ff; color: #2563eb; }
        .meta .card-badge { background: #ecfdf5; color: #059669; }
        .legacy .card-badge { background: #fdf2f8; color: #b45389; }

        .card-icon {
            font-size: 2.8rem;
            margin-bottom: 0.6rem;
        }

        .download-card h3 {
            font-size: 1.6rem;
            margin-bottom: 0.5rem;
            font-weight: 700;
            color: #1a3a4e;
        }

        .card-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem;
            justify-content: center;
            margin: 0.8rem 0 1.2rem;
        }

        .card-chips span {
            background: #f1f5f9;
            color: #3a627c;
            padding: 0.25rem 0.7rem;
            border-radius: 16px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .btn-primary {
            background: #1e5a7a;
            color: white;
            padding: 0.7rem 1.8rem;
            border-radius: 48px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.2s;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
            display: inline-block;
            margin: 0.4rem 0.2rem;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            background: #0f4562;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(15, 69, 98, 0.25);
        }

        .btn-outline {
            background: transparent;
            color: #1e5a7a;
            padding: 0.6rem 1.5rem;
            border-radius: 48px;
            font-weight: 500;
            text-decoration: none;
            border: 1px solid #1e5a7a;
            font-size: 0.9rem;
            transition: 0.2s;
            display: inline-block;
            margin: 0.3rem 0.2rem;
        }

        .btn-outline:hover {
            background: rgba(30, 90, 122, 0.08);
            transform: translateY(-2px);
        }

        /* 技术说明区域 */
        .tech-section {
            padding: 3rem 0;
        }

        .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: #1a3a4e;
        }

        .section-subtitle {
            text-align: center;
            color: #4a7896;
            font-size: 1rem;
            margin-bottom: 2.5rem;
        }

        .tech-details {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        details.tech-item {
            background: rgba(255, 255, 255, 0.75);
            border-radius: 1.5rem;
            border: 1px solid rgba(0, 0, 0, 0.05);
            padding: 0.8rem 1.5rem;
            transition: all 0.2s;
        }

        details.tech-item[open] {
            background: white;
            box-shadow: 0 8px 20px -8px rgba(0, 0, 0, 0.08);
        }

        details.tech-item summary {
            font-weight: 600;
            color: #1a3a4e;
            font-size: 1.1rem;
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.5rem 0;
        }

        details.tech-item summary::-webkit-details-marker {
            display: none;
        }

        details.tech-item summary::after {
            content: '▸';
            font-size: 1.2rem;
            color: #1e5a7a;
            transition: transform 0.2s;
            margin-left: 1rem;
        }

        details.tech-item[open] summary::after {
            transform: rotate(90deg);
        }

        .tech-content {
            padding: 0.5rem 0 1rem;
            color: #3e627c;
            line-height: 1.7;
            font-size: 0.95rem;
        }

        .tech-content ul {
            list-style: none;
            padding-left: 0;
        }

        .tech-content ul li {
            margin: 0.4rem 0;
            padding-left: 1.2rem;
            position: relative;
        }

        .tech-content ul li::before {
            content: '•';
            color: #1e5a7a;
            font-weight: bold;
            position: absolute;
            left: 0;
        }

        /* 跨平台链接 */
        .cross-platform {
            padding: 3rem 0;
        }

        .platform-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 1.5rem;
            max-width: 700px;
            margin: 0 auto;
        }

        .platform-card {
            background: rgba(255, 255, 255, 0.75);
            border-radius: 1.5rem;
            padding: 1.8rem 1.5rem;
            text-align: center;
            border: 1px solid rgba(0, 0, 0, 0.04);
            transition: all 0.25s;
            text-decoration: none;
            color: inherit;
            display: block;
        }

        .platform-card:hover {
            background: white;
            transform: translateY(-4px);
            box-shadow: 0 14px 24px -10px rgba(0, 0, 0, 0.1);
        }

        .platform-icon {
            font-size: 2.5rem;
            margin-bottom: 0.6rem;
        }

        .platform-card h4 {
            font-weight: 600;
            color: #1a3a4e;
            margin-bottom: 0.3rem;
        }

        .platform-card p {
            font-size: 0.85rem;
            color: #5a8aaa;
        }

        /* 内链区域 */
        .internal-links-section {
            padding: 2rem 0 4rem;
        }

        .internal-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            max-width: 900px;
            margin: 0 auto;
        }

        .internal-link-card {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            background: rgba(255, 255, 255, 0.7);
            border-radius: 1.2rem;
            padding: 1rem 1.3rem;
            text-decoration: none;
            color: #2c4c6c;
            font-weight: 500;
            transition: all 0.2s;
            border: 1px solid rgba(0, 0, 0, 0.04);
            font-size: 0.95rem;
        }

        .internal-link-card:hover {
            background: white;
            transform: translateX(4px);
            box-shadow: 0 6px 16px -6px rgba(0, 0, 0, 0.1);
            color: #0f6b9c;
        }

        .internal-link-card .link-arrow {
            margin-left: auto;
            color: #1e5a7a;
            font-weight: 700;
            font-size: 1.1rem;
            transition: transform 0.2s;
        }

        .internal-link-card:hover .link-arrow {
            transform: translateX(4px);
        }

        .info-banner {
            background: linear-gradient(100deg, #e7f0f5 0%, #dce8ef 100%);
            border-radius: 2rem;
            padding: 2rem 1.5rem;
            margin: 1rem auto 3rem;
            text-align: center;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            max-width: 800px;
        }

        .info-banner p {
            margin: 0;
            width: 100%;
        }

        .domain {
            font-family: monospace;
            background: rgba(0, 0, 0, 0.05);
            padding: 0.2rem 0.5rem;
            border-radius: 12px;
        }

        /* Footer */
        .site-footer {
            background: #0f2b38;
            color: #cbdbe2;
            padding: 2.5rem 0;
            margin-top: 2rem;
            border-top: 1px solid #203e4e;
        }

        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1.5rem;
            align-items: center;
        }

        .copyright {
            font-size: 0.85rem;
        }

        .footer-links a {
            color: #bfd7e5;
            text-decoration: none;
            margin-left: 1.5rem;
            font-size: 0.9rem;
        }

        .footer-links a:hover {
            color: white;
        }

        @media (max-width: 680px) {
            .container {
                padding: 0 1.25rem;
            }
            .navbar {
                flex-direction: column;
            }
            .nav-links {
                gap: 1rem;
            }
            .download-hero h1 {
                font-size: 2rem;
            }
            .architecture-badges {
                gap: 0.5rem;
            }
            .btn-primary,
            .btn-outline {
                padding: 0.6rem 1.4rem;
                font-size: 0.9rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .download-card {
                padding: 1.6rem 1.2rem;
            }
        }