/* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Roboto', 'Segoe UI', sans-serif;
            background: #ffffff;
            color: #1a1a2e;
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Update Options Section ===== */
        .update-options-section {
            padding: 80px 0 100px;
            background: #ffffff;
            position: relative;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-header .badge {
            display: inline-block;
            background: rgba(42, 92, 170, 0.10);
            color: #2A5CAA;
            font-size: 0.7rem;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            padding: 6px 22px;
            border-radius: 30px;
            margin-bottom: 18px;
            border: 1px solid rgba(42, 92, 170, 0.08);
        }

        .section-header h2 {
            font-family: 'Montserrat', sans-serif;
            font-size: 2.6rem;
            font-weight: 800;
            color: #1a1a2e;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }

        .section-header h2 span {
            color: #2A5CAA;
            position: relative;
        }

        .section-header h2 span::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 0;
            width: 100%;
            height: 8px;
            background: rgba(255, 107, 53, 0.25);
            border-radius: 4px;
            z-index: -1;
        }

        .section-header .subtitle {
            font-size: 1.1rem;
            color: #555;
            max-width: 600px;
            margin: 0 auto;
        }

        /* ---- Options Grid ---- */
        .options-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }

        /* ---- Platform Cards ---- */
        .option-card {
            background: #ffffff;
            border-radius: 24px;
            padding: 40px 32px 36px;
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.04);
            border: 1px solid rgba(42, 92, 170, 0.06);
            transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .option-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, #2A5CAA, #4A7CC8);
            opacity: 0;
            transition: opacity 0.4s ease;
        }

        .option-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 60px rgba(42, 92, 170, 0.10);
            border-color: rgba(42, 92, 170, 0.12);
        }

        .option-card:hover::before {
            opacity: 1;
        }

        .option-card .platform-icon {
            width: 72px;
            height: 72px;
            background: linear-gradient(135deg, rgba(42, 92, 170, 0.06), rgba(74, 124, 200, 0.10));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            transition: all 0.4s ease;
        }

        .option-card:hover .platform-icon {
            background: linear-gradient(135deg, rgba(42, 92, 170, 0.12), rgba(74, 124, 200, 0.18));
            transform: scale(1.05);
        }

        .option-card .platform-icon svg {
            width: 36px;
            height: 36px;
        }

        .option-card h3 {
            font-family: 'Montserrat', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            color: #1a1a2e;
            margin-bottom: 6px;
        }

        .option-card .os-version {
            font-size: 0.85rem;
            color: #888;
            margin-bottom: 24px;
        }

        .qr-placeholder {
            width: 180px;
            height: 180px;
            background: #f8faff;
            border: 2px dashed #d0d9e8;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            transition: all 0.3s ease;
            position: relative;
        }

        .qr-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            border-radius: 14px;
        }

        .qr-placeholder .placeholder-text {
            color: #a0aec0;
            font-size: 0.8rem;
            font-weight: 500;
            letter-spacing: 1px;
        }

        .option-card .instruction {
            font-size: 0.95rem;
            color: #555;
            margin-bottom: 24px;
            line-height: 1.6;
            max-width: 280px;
        }

        .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            text-decoration: none;
            transition: all 0.3s ease;
            background: #2A5CAA;
            color: #ffffff;
            box-shadow: 0 4px 16px rgba(42, 92, 170, 0.20);
            border: none;
            cursor: pointer;
        }

        .download-btn:hover {
            background: #4A7CC8;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(42, 92, 170, 0.30);
        }

        .download-btn .arrow {
            transition: transform 0.3s ease;
        }

        .download-btn:hover .arrow {
            transform: translateX(4px);
        }

        /* ---- Android Specific ---- */
        .option-card.android .platform-icon svg {
            fill: #3DDC84;
        }

        /* ---- iOS Specific ---- */
        .option-card.ios .platform-icon svg {
            fill: #000000;
        }

        /* ---- Compatibility Note ---- */
        .compatibility-note {
            max-width: 800px;
            margin: 0 auto;
            background: #fff8f0;
            border: 1px solid #ffe0c2;
            border-radius: 16px;
            padding: 18px 24px;
            display: flex;
            align-items: flex-start;
            gap: 16px;
            transition: all 0.3s ease;
        }

        .compatibility-note:hover {
            background: #fff3e6;
            border-color: #ffb882;
        }

        .compatibility-note .note-icon {
            font-size: 1.4rem;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .compatibility-note p {
            font-size: 0.95rem;
            color: #4a3a2a;
            line-height: 1.6;
            margin: 0;
        }

        .compatibility-note p strong {
            color: #d46b2a;
            font-weight: 700;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .section-header h2 {
                font-size: 2.2rem;
            }
            .qr-placeholder {
                width: 160px;
                height: 160px;
            }
        }

        @media (max-width: 820px) {
            .options-grid {
                gap: 24px;
            }
            .option-card {
                padding: 32px 20px 28px;
            }
        }

        @media (max-width: 640px) {
            .options-grid {
                grid-template-columns: 1fr;
                max-width: 460px;
                margin-left: auto;
                margin-right: auto;
            }

            .update-options-section {
                padding: 60px 0 70px;
            }

            .section-header h2 {
                font-size: 1.8rem;
            }

            .section-header .subtitle {
                font-size: 1rem;
            }

            .qr-placeholder {
                width: 160px;
                height: 160px;
            }

            .compatibility-note {
                flex-direction: column;
                align-items: center;
                text-align: center;
                padding: 20px;
            }
        }

        @media (max-width: 400px) {
            .container {
                padding: 0 16px;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .option-card h3 {
                font-size: 1.3rem;
            }
            .qr-placeholder {
                width: 140px;
                height: 140px;
            }
            .download-btn {
                padding: 10px 24px;
                font-size: 0.85rem;
            }
        }