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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background-color: #f8fafc;
            color: #0f172a;
            line-height: 1.5;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .header {
            background-color: #ffffff;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 50;
            border-bottom: 1px solid #e2e8f0;
        }

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

        .logo a {
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(135deg, #2563eb, #1e40af);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            text-decoration: none;
            letter-spacing: -0.3px;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #1e293b;
            transition: color 0.2s;
        }

        .nav-links a:hover {
            color: #2563eb;
        }

        .btn-subscribe {
            background-color: #2563eb;
            color: white !important;
            padding: 0.5rem 1.25rem;
            border-radius: 40px;
            transition: background 0.2s;
        }

        .btn-subscribe:hover {
            background-color: #1d4ed8;
        }

        .page-header {
            text-align: center;
            padding: 3rem 0 1rem;
        }

        .page-header h1 {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(to right, #0f172a, #2563eb);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 1rem;
        }

        .page-header p {
            font-size: 1.2rem;
            color: #334155;
            max-width: 700px;
            margin: 0 auto;
        }

        /* 下载卡片四列 */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.8rem;
            margin: 3rem 0 2rem;
        }

        .download-card {
            background: #ffffff;
            border-radius: 1.75rem;
            padding: 1.6rem;
            box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05);
            border: 1px solid #eef2ff;
            transition: all 0.25s ease;
            display: flex;
            flex-direction: column;
        }

        .download-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 30px -12px rgba(0,0,0,0.12);
            border-color: #cbd5e1;
        }

        .os-icon {
            font-size: 2.8rem;
            margin-bottom: 0.5rem;
        }

        .download-card h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0.25rem 0 0.2rem;
        }

        .version-meta {
            font-size: 0.75rem;
            color: #475569;
            border-top: 1px solid #eef2ff;
            margin-top: 0.5rem;
            padding-top: 0.5rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .version-meta span {
            background: #f1f5f9;
            padding: 0.2rem 0.6rem;
            border-radius: 20px;
        }
        .tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 0.7rem 0;
        }
        .tag {
            font-size: 0.7rem;
            background: #e0f2fe;
            color: #0369a1;
            padding: 0.2rem 0.7rem;
            border-radius: 30px;
            font-weight: 500;
        }
        .tag.deprecated {
            background: #fee2e2;
            color: #b91c1c;
        }
        .tag.official {
            background: #dcfce7;
            color: #15803d;
        }
        .download-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            margin: 0.8rem 0 0.5rem;
        }
        .download-btn-sm {
            background-color: #2563eb;
            color: white;
            padding: 0.4rem 1rem;
            border-radius: 40px;
            text-decoration: none;
            font-size: 0.8rem;
            font-weight: 500;
            transition: background 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            cursor: pointer;
            border: none;
        }
        .download-btn-sm:hover {
            background-color: #1e40af;
        }
        .btn-outline-sm {
            background: transparent;
            border: 1px solid #2563eb;
            color: #2563eb;
            padding: 0.4rem 1rem;
            border-radius: 40px;
            text-decoration: none;
            font-size: 0.8rem;
            font-weight: 500;
            transition: all 0.2s;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 0.2rem;
        }
        .btn-outline-sm:hover {
            background: #eef2ff;
        }
        .note-text {
            font-size: 0.7rem;
            color: #64748b;
            margin-top: 0.6rem;
        }

        /* 通用板块样式 */
        .info-section {
            background: #ffffff;
            border-radius: 1.75rem;
            padding: 1.8rem;
            margin: 2rem 0;
            border: 1px solid #e2e8f0;
        }
        .info-section h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* 四平台安装要求网格 */
        .requirements-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin: 1rem 0;
        }
        .req-card {
            background: #f8fafc;
            border-radius: 1.25rem;
            padding: 1.2rem;
            border: 1px solid #eef2ff;
            transition: 0.2s;
        }
        .req-card:hover {
            background: #f1f5f9;
        }
        .req-header {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.5rem;
        }
        .req-list {
            list-style: none;
            font-size: 0.85rem;
            color: #334155;
        }
        .req-list li {
            margin-bottom: 0.5rem;
            padding-left: 1.2rem;
            position: relative;
        }
        .req-list li::before {
            content: "✔️";
            position: absolute;
            left: 0;
            color: #2563eb;
            font-size: 0.75rem;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1rem 0;
            font-size: 0.9rem;
        }
        .comparison-table th, .comparison-table td {
            border: 1px solid #e2e8f0;
            padding: 0.7rem;
            text-align: left;
        }
        .comparison-table th {
            background: #f8fafc;
            font-weight: 600;
        }
        .update-log {
            list-style: none;
        }
        .update-log li {
            padding: 0.5rem 0;
            border-bottom: 1px dashed #e2e8f0;
        }
        .note-box {
            background: #eef2ff;
            border-left: 5px solid #2563eb;
            padding: 1.2rem 1.8rem;
            border-radius: 1rem;
            margin: 1rem 0 3rem;
        }
        .footer {
            border-top: 1px solid #e2e8f0;
            background: #f9fafb;
            padding: 2rem 0;
            margin-top: 2rem;
            text-align: center;
            color: #475569;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            margin-bottom: 1rem;
        }
        .footer-links a {
            text-decoration: none;
            color: #334155;
        }
        .footer-links a:hover {
            color: #2563eb;
        }

        @media (max-width: 1100px) {
            .download-grid, .requirements-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem;
            }
        }
        @media (max-width: 640px) {
            .download-grid, .requirements-grid {
                grid-template-columns: 1fr;
            }
            .nav {
                flex-direction: column;
                gap: 1rem;
            }
        }