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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, sans-serif;
            background: #f8fafc;
            color: #1e293b;
            line-height: 1.5;
        }

        .bg-soft {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -2;
            background: radial-gradient(circle at 10% 20%, #e6f0fa, #f1f5f9);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            flex-wrap: wrap;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: #1e3a6f;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 20px rgba(30,58,111,0.15);
        }

        .logo-text {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0a2b4e;
            letter-spacing: -0.3px;
        }

        .nav-links {
            display: flex;
            gap: 36px;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-links a {
            color: #334155;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s;
            font-size: 1rem;
        }

        .nav-links a:hover, .nav-links a.active {
            color: #1e6f5c;
        }

        .page-header {
            text-align: center;
            padding: 56px 0 40px;
        }

        .page-header h1 {
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0a2b4e, #1e6f5c);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 16px;
        }

        .page-header p {
            color: #54708f;
            font-size: 1.2rem;
            max-width: 600px;
            margin: 0 auto;
        }

        /* 全新双列布局，替代之前的独立卡片 */
        .platform-grid {
            display: flex;
            flex-direction: column;
            gap: 28px;
            margin: 48px 0 56px;
        }

        .platform-row {
            display: flex;
            flex-wrap: wrap;
            gap: 28px;
            justify-content: center;
        }

        .download-card {
            flex: 1;
            min-width: 260px;
            background: white;
            border-radius: 32px;
            padding: 32px 28px;
            display: flex;
            align-items: center;
            gap: 24px;
            transition: all 0.3s ease;
            box-shadow: 0 5px 18px rgba(0, 0, 0, 0.03);
            border: 1px solid #e4edf5;
        }

        .download-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 32px -12px rgba(30,111,92,0.15);
            border-color: #c8dfd6;
        }

        .card-icon {
            font-size: 3.2rem;
            background: #f0f6fa;
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 28px;
        }

        .card-info {
            flex: 1;
        }

        .card-info h3 {
            font-size: 1.6rem;
            font-weight: 700;
            color: #0f2c47;
            margin-bottom: 6px;
        }

        .card-info .version {
            font-size: 0.75rem;
            color: #7e95b0;
            margin-bottom: 8px;
        }

        .card-info .desc {
            color: #4b6584;
            font-size: 0.85rem;
        }

        .btn-group {
            display: flex;
            flex-direction: column;
            gap: 10px;
            min-width: 140px;
        }

        .btn-download {
            background: #1e6f5c;
            border: none;
            padding: 10px 20px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            color: white;
            cursor: pointer;
            text-decoration: none;
            text-align: center;
            transition: all 0.2s;
            display: inline-block;
        }

        .btn-download:hover {
            background: #0f5546;
            transform: translateY(-1px);
        }

        .btn-secondary {
            background: transparent;
            border: 1px solid #cbdde9;
            color: #4a6f8f;
        }

        .btn-secondary:hover {
            background: #eef3fc;
            border-color: #1e6f5c;
            color: #1e6f5c;
        }

        .feature-banner {
            background: linear-gradient(120deg, #eef4f0, #ffffff);
            border-radius: 48px;
            padding: 48px 40px;
            margin: 40px 0 56px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 32px;
            border: 1px solid #d4e2dc;
        }

        .feature-banner h3 {
            font-size: 1.7rem;
            color: #0a2b4e;
        }

        .badge-list {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .badge {
            background: #1e6f5c10;
            padding: 8px 20px;
            border-radius: 40px;
            color: #1e6f5c;
            font-weight: 500;
        }

        .security-note {
            background: #ffffffcc;
            backdrop-filter: blur(4px);
            border-radius: 32px;
            padding: 32px;
            text-align: center;
            margin: 40px 0 60px;
            border: 1px solid #e9f0f5;
        }

        .footer {
            border-top: 1px solid #dce5ef;
            padding: 48px 0 32px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
            margin-top: 20px;
        }

        .footer-copyright {
            font-size: 0.85rem;
            color: #6f8aaa;
        }

        .footer-links a {
            color: #4a6f8f;
            text-decoration: none;
            margin-left: 32px;
            font-size: 0.9rem;
        }

        .footer-links a:hover {
            color: #1e6f5c;
        }

        @media (max-width: 800px) {
            .download-card {
                flex-direction: column;
                text-align: center;
            }
            .btn-group {
                width: 100%;
                flex-direction: row;
                justify-content: center;
            }
            .navbar {
                flex-direction: column;
                gap: 16px;
            }
            .page-header h1 {
                font-size: 2.2rem;
            }
            .feature-banner {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 550px) {
            .btn-group {
                flex-direction: column;
                width: 100%;
            }
        }