:root {
            --primary-color: #007aff;
            --secondary-bg: #ffffff;
            --main-bg: #f2f2f7;
            --text-dark: #1c1c1e;
            --text-gray: #8e8e93;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--main-bg);
            margin: 0;
            padding: 0;
            color: var(--text-dark);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        nav {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            padding: 10px 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid #d1d1d6;
        }

        .logo-img {
            width: 40px;
            height: 40px;
            border-radius: 9px;
            object-fit: cover;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        header {
            padding: 40px 5% 20px;
            max-width: 1000px;
            margin: 0 auto;
            text-align: left;
        }

        header h1 { font-size: 2.2rem; font-weight: 800; margin: 0; letter-spacing: -0.8px; line-height: 1.2; }
        header p { color: var(--text-gray); margin-top: 10px; font-size: 1.1rem; line-height: 1.5; font-weight: 500;}

        #offerContainer {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 20px;
            max-width: 1000px;
            margin: 0 auto;
            padding: 0 5% 50px;
            flex: 1;
        }

        .app-card {
            background: var(--secondary-bg);
            border-radius: 24px;
            padding: 22px;
            display: flex;
            align-items: center;
            text-decoration: none;
            color: inherit;
            transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            border: 1px solid rgba(0,0,0,0.03);
            position: relative;
        }

        .app-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
        }

        .app-icon {
            width: 85px;
            height: 85px;
            border-radius: 19px;
            object-fit: cover;
            margin-right: 20px;
            box-shadow: 0 6px 15px rgba(0,0,0,0.08);
        }

        .app-info {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .app-name {
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 6px;
            color: var(--text-dark);
            line-height: 1.2;
        }

        .app-desc {
            font-size: 0.85rem;
            color: var(--text-gray);
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .download-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 10px 18px;
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.8rem;
            text-align: center;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            width: fit-content;
        }

        .download-icon {
            width: 16px;
            height: 16px;
            fill: currentColor;
        }

        .app-card:hover .download-btn {
            background: #005ecb;
            box-shadow: 0 4px 15px rgba(0, 122, 255, 0.3);
        }

        footer {
            padding: 30px 5%;
            text-align: center;
            background: #ffffff;
            border-top: 1px solid #d1d1d6;
            margin-top: auto;
        }

        .copyright {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-dark);
        }

        .loading {
            text-align: center;
            grid-column: 1 / -1;
            padding: 80px;
            font-weight: 600;
            color: var(--text-gray);
        }

        @media (max-width: 500px) {
            header h1 { font-size: 1.8rem; }
            #offerContainer { grid-template-columns: 1fr; padding: 0 15px 40px;}
            .app-icon { width: 75px; height: 75px; margin-right: 15px; }
        }