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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: #F7F9FE;
            color: #121826;
        }

        .header {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid #E9EDF4;
            position: sticky;
            top: 0;
            z-index: 50;
        }

        .nav-container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        .logo {
            font-size: 1.9rem;
            font-weight: 800;
            background: linear-gradient(110deg, #1F2B4E, #2666C9);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #2D3A5E;
            transition: 0.2s;
        }

        .nav-links a.active, .nav-links a:hover {
            color: #2666C9;
        }

        .download-hero {
            background: linear-gradient(125deg, #111827 0%, #1A2D44 100%);
            margin: 0 0 4rem 0;
            padding: 4rem 2rem;
            border-radius: 0 0 48px 48px;
            color: white;
            text-align: center;
        }

        .download-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
        }

        .download-hero p {
            max-width: 600px;
            margin: 1rem auto 0;
            opacity: 0.8;
        }

        .platform-showcase {
            max-width: 1300px;
            margin: -2rem auto 4rem;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 2rem;
        }

        .platform-card-new {
            background: #FFFFFF;
            border-radius: 2.5rem;
            padding: 1.8rem;
            text-align: center;
            box-shadow: 0 25px 40px -12px rgba(0, 0, 0, 0.15);
            transition: transform 0.25s, box-shadow 0.25s;
            border: 1px solid rgba(0,0,0,0.05);
        }

        .platform-card-new:hover {
            transform: translateY(-6px);
            box-shadow: 0 30px 45px -12px rgba(0, 0, 0, 0.2);
        }

        .os-icon {
            font-size: 3rem;
            margin-bottom: 0.5rem;
        }

        .platform-card-new h3 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 0.3rem 0 0.3rem;
        }

        .version-tag {
            background: #EEF3FC;
            border-radius: 60px;
            padding: 0.2rem 0.9rem;
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            margin: 0.5rem 0;
        }

        .download-button {
            background: #2666C9;
            color: white;
            border: none;
            border-radius: 50px;
            padding: 0.7rem 1.8rem;
            font-weight: 600;
            margin-top: 1rem;
            cursor: pointer;
            transition: 0.2s;
            text-decoration: none;
            display: inline-block;
        }

        .download-button:hover {
            background: #0F4FA3;
        }

        .feature-grid-download {
            max-width: 1200px;
            margin: 3rem auto;
            padding: 2rem;
            background: #FFFFFF;
            border-radius: 3rem;
            box-shadow: 0 12px 24px -12px rgba(0,0,0,0.05);
        }

        .two-columns {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            justify-content: space-between;
        }

        .col {
            flex: 1;
        }

        .check-list {
            list-style: none;
        }

        .check-list li {
            margin: 1rem 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .badge-new {
            background: #EFF6FF;
            color: #2666C9;
            border-radius: 30px;
            padding: 0.2rem 1rem;
            font-size: 0.8rem;
        }

        .cta-dark {
            background: #121826;
            border-radius: 2.5rem;
            padding: 2.5rem;
            text-align: center;
            color: white;
            margin: 2rem auto;
            max-width: 1000px;
        }

        .btn-light {
            background: white;
            color: #121826;
            padding: 0.7rem 2rem;
            border-radius: 60px;
            font-weight: 600;
            text-decoration: none;
            display: inline-block;
        }

        .footer {
            background: #F9F9FE;
            border-top: 1px solid #E9EDF4;
            margin-top: 4rem;
        }

        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 3rem 2rem 2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }

        .footer-col a {
            display: block;
            color: #5C6885;
            text-decoration: none;
            margin-bottom: 0.5rem;
            font-size: 0.9rem;
        }

        .copyright {
            text-align: center;
            padding: 1.5rem;
            font-size: 0.8rem;
            color: #6C7A95;
            border-top: 1px solid #E9EDF4;
        }
        @media (max-width: 760px) {
            .download-hero h1 { font-size: 2.2rem; }
            .platform-showcase { gap: 1rem; }
        }