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

        shp-body {
            background: #f2f2f2;
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            line-height: 1.55;
            padding: 2rem 1rem;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            display: block;
        }

        /* content card style - clean, professional, black text only */
        shp-card {
            max-width: 960px;
            width: 100%;
            background: #ffffff;
            border: 1px solid #d0d0d0;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            overflow: hidden;
            display: block;
            margin: 0 auto;
        }

        shp-card-header {
            padding: 1.5rem 2rem 0.75rem 2rem;
            border-bottom: 2px solid #000000;
            background: #ffffff;
            display: block;
        }

        shp-card-header h2 {
            font-size: 1.8rem;
            font-weight: 600;
            color: #000000;
            letter-spacing: -0.3px;
            margin-bottom: 0.4rem;
        }

        shp-subhead {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-weight: 500;
            color: #000000;
            border-left: 3px solid #888888;
            padding-left: 0.75rem;
            margin-top: 0.3rem;
            display: block;
        }

        shp-card-content {
            padding: 1.8rem 2rem 2.2rem 2rem;
            display: block;
        }

        shp-section {
            margin-bottom: 2rem;
            display: block;
        }

        shp-section p {
            margin-bottom: 1rem;
            color: #000000;
            font-size: 1rem;
        }

        shp-section strong {
            font-weight: 700;
            color: #000000;
        }

        shp-file-list, shp-optional-list {
            background: #fafafa;
            border-left: 3px solid #aaaaaa;
            padding: 1rem 1.5rem;
            margin: 1rem 0 1.2rem 0;
            list-style: none;
            display: block;
        }

        shp-file-list li, shp-optional-list li {
            margin-bottom: 0.75rem;
            padding-left: 1.2rem;
            position: relative;
            color: #000000;
            font-size: 0.95rem;
        }

        shp-file-list li::before, shp-optional-list li::before {
            content: "-";
            position: absolute;
            left: 0;
            color: #000000;
            font-weight: 500;
        }

        shp-code-highlight {
            background: #f0f0f0;
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 0.85rem;
            padding: 0.2rem 0.5rem;
            border: 1px solid #dddddd;
            color: #000000;
            display: inline-block;
            border-radius: 4px;
        }

        shp-note-box {
            background: #f6f6f6;
            border: 1px solid #e0e0e0;
            padding: 1rem 1.5rem;
            margin: 1.2rem 0;
            color: #000000;
            border-radius: 4px;
            display: block;
        }

        shp-limit-text {
            margin-top: 0.5rem;
            padding-top: 0.5rem;
            border-top: 1px solid #eeeeee;
            display: block;
        }

        shp-hr {
            margin: 1.2rem 0;
            border: none;
            height: 1px;
            background: #cccccc;
            display: block;
        }

        shp-footer-meta {
            font-size: 0.8rem;
            color: #000000;
            border-top: 1px solid #e0e0e0;
            margin-top: 1.5rem;
            padding-top: 1rem;
            text-align: center;
            display: block;
        }

        @media (max-width: 680px) {
            shp-card-content {
                padding: 1.2rem;
            }
            shp-card-header h2 {
                font-size: 1.4rem;
            }
            shp-card-header {
                padding: 1.2rem 1.2rem 0.6rem;
            }
        }