body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 20px;
            background-color: #f9fafb;
            color: #1f2937;
        }
        .container {
            max-width: 850px;
            margin: 0 auto;
            background: white;
            padding: 35px 30px;
            border-radius: 20px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        }
        h1 {
            font-size: 1.9rem;
            border-left: 5px solid #ef4444;
            padding-left: 20px;
            margin-top: 0;
            margin-bottom: 0.5rem;
            color: #111827;
        }
        .app-badge {
            display: inline-block;
            background-color: #3b82f6;
            color: white;
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 500;
            margin-bottom: 20px;
        }
        .subtitle {
            color: #4b5563;
            margin-bottom: 2rem;
            font-size: 1rem;
            border-bottom: 1px solid #e5e7eb;
            padding-bottom: 15px;
        }
        h2 {
            font-size: 1.4rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
            color: #1e3a8a;
        }
        .step {
            background-color: #f9fafb;
            border-radius: 16px;
            padding: 20px;
            margin: 20px 0;
            border-left: 4px solid #3b82f6;
            transition: all 0.2s;
        }
        .step-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
        }
        .step-number {
            background-color: #3b82f6;
            color: white;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1rem;
        }
        .step-title {
            font-weight: 700;
            font-size: 1.15rem;
            color: #1f2937;
        }
        .step-content {
            margin-left: 44px;
            color: #374151;
        }
        .instruction-icon {
            background-color: #e5e7eb;
            border-radius: 12px;
            padding: 12px 16px;
            margin: 15px 0 5px;
            font-family: monospace;
            font-size: 0.9rem;
            text-align: center;
            color: #1f2937;
        }
        .data-box {
            background: linear-gradient(135deg, #fef2f2 0%, #fff 100%);
            border-radius: 16px;
            padding: 20px;
            margin: 25px 0;
            border: 1px solid #fee2e2;
        }
        .data-box h3 {
            margin-top: 0;
            color: #dc2626;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .data-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 12px;
            margin: 15px 0;
        }
        .data-item {
            background: white;
            padding: 8px 12px;
            border-radius: 10px;
            border: 1px solid #fecaca;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .retention-box {
            background-color: #eef2ff;
            border-radius: 16px;
            padding: 20px;
            margin: 25px 0;
            border-left: 4px solid #3b82f6;
        }
        .btn-section {
            margin: 35px 0 20px;
            text-align: center;
        }
        .btn {
            display: inline-block;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 600;
            text-align: center;
            border-radius: 50px;
            text-decoration: none;
            transition: all 0.2s ease;
            margin: 8px;
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background-color: #ef4444;
            color: white;
            box-shadow: 0 2px 8px rgba(239,68,68,0.3);
        }
        .btn-primary:hover {
            background-color: #dc2626;
            transform: translateY(-2px);
            text-decoration: none;
        }
        .btn-secondary {
            background-color: #f97316;
            color: white;
            box-shadow: 0 2px 8px rgba(249,115,22,0.3);
        }
        .btn-secondary:hover {
            background-color: #ea580c;
            transform: translateY(-2px);
            text-decoration: none;
        }
        .info-note {
            background-color: #fef9c3;
            border-radius: 12px;
            padding: 12px 16px;
            font-size: 0.85rem;
            text-align: center;
            color: #854d0e;
            margin-top: 15px;
        }
        hr {
            margin: 2rem 0;
            border: 0;
            height: 1px;
            background: #e5e7eb;
        }
        .footer {
            margin-top: 2rem;
            font-size: 0.8rem;
            text-align: center;
            color: #6b7280;
        }
        .highlight {
            background-color: #dbeafe;
            padding: 2px 6px;
            border-radius: 6px;
            font-weight: 500;
        }
        @media (max-width: 600px) {
            body {
                padding: 12px;
            }
            .container {
                padding: 20px 18px;
            }
            h1 {
                font-size: 1.5rem;
            }
            .step-content {
                margin-left: 0;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
                display: block;
                margin: 10px auto;
            }
        }