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

        body {
            background: #f9fafb;
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            line-height: 1.5;
            color: #1e293b;
            padding: 2rem 1.5rem;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            background: white;
            border-radius: 1.5rem;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.03), 0 2px 6px rgba(0, 0, 0, 0.05);
            padding: 2rem 2rem 2rem 2rem;
        }

        /* Typography */
        h1 {
            font-size: 2rem;
            font-weight: 700;
            border-left: 5px solid #3b82f6;
            padding-left: 1rem;
            margin: 0 0 1.25rem 0;
            line-height: 1.2;
        }

        h2 {
            font-size: 1.6rem;
            font-weight: 600;
            margin: 2rem 0 1rem 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }

        p {
            margin-bottom: 1rem;
            color: #334155;
        }

        /* Lists */
        ul.clean-list {
            list-style: none;
            margin: 1rem 0 1.5rem 0;
            padding: 0;
        }

        ul.clean-list li {
            margin-bottom: 0.85rem;
            padding-left: 1.8rem;
            position: relative;
            line-height: 1.45;
        }

        ul.clean-list li strong {
            font-weight: 600;
            color: #0f172a;
        }

        ul.clean-list li::before {
            content: "⚡";
            position: absolute;
            left: 0;
            top: 0;
            color: #3b82f6;
            font-size: 1.1rem;
        }

        /* Standard bullet list for box contents */
        .simple-list {
            margin: 0.5rem 0 1.2rem 1.8rem;
        }

        .simple-list li {
            margin-bottom: 0.3rem;
        }

        /* Tables */
        .spec-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.2rem 0 1.8rem;
            background: #fefefe;
            border-radius: 1rem;
            overflow: hidden;
            box-shadow: 0 1px 2px rgba(0,0,0,0.03);
        }

        .spec-table th,
        .spec-table td {
            text-align: left;
            padding: 12px 16px;
            border-bottom: 1px solid #e9edf2;
        }

        .spec-table th {
            background-color: #f1f5f9;
            font-weight: 600;
            color: #1e40af;
            width: 35%;
        }

        .spec-table tr:last-child td,
        .spec-table tr:last-child th {
            border-bottom: none;
        }

        /* Use case table */
        .usecase-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.2rem 0 1.8rem;
            background: #f8fafc;
            border-radius: 1rem;
            overflow: hidden;
        }

        .usecase-table th {
            background: #eef2ff;
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
            color: #1e40af;
        }

        .usecase-table td {
            padding: 12px 16px;
            border-bottom: 1px solid #e2e8f0;
            background: white;
        }

        .usecase-table tr:last-child td {
            border-bottom: none;
        }

        /* Compatibility note */
        .note-box {
            background: #fefce8;
            border-left: 4px solid #eab308;
            padding: 1rem 1.2rem;
            border-radius: 0.75rem;
            margin: 1.5rem 0 1rem;
        }

        .note-box p {
            margin-bottom: 0;
        }

        /* Image row */
        .image-row {
            display: flex;
            flex-wrap: wrap;
            gap: 1.8rem;
            justify-content: center;
            align-items: center;
            margin: 2rem 0 1rem;
        }

        .image-card {
            flex: 1 1 280px;
            text-align: center;
            background: #ffffff;
            border-radius: 1rem;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            transition: transform 0.2s ease;
        }

        .image-card img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: contain;
            background: #f9fafb;
        }

        /* footer */
        .footer-note {
            font-size: 0.8rem;
            text-align: center;
            color: #94a3b8;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid #eef2ff;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        @media (max-width: 640px) {
            .container {
                padding: 1.5rem;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
            }
        }