.input-group-custom {
            margin-bottom: 1rem;
        }
        .deep-dive {
            margin: 1.8rem 0;
        }
        .deep-dive p {
            text-align: justify;
        }
        .unit-note {
            font-size: 0.9rem;
            color: #6c757d;
        }
        .coord-input {
            margin-bottom: 0.5rem;
        }
        .result-display {
            background: #f8faff;
            border-radius: 12px;
            padding: 1.5rem;
            border: 1px solid #e9ecef;
        }
        .result-display .big-number {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            font-family: 'Cambria Math', 'Latin Modern Math', serif;word-break:break-all
        }
        .result-display .unit-label {
            font-size: 1.4rem;
            color: #6c757d;
            font-weight: 400;
        }
        .conversion-card {
            background: white;
            border-radius: 10px;
            padding: 1.2rem 1.5rem;
            margin: 0.8rem 0;
            border: 1px solid #e9ecef;
            transition: all 0.2s;
        }
        .conversion-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 2px 12px rgba(70, 130, 180, 0.08);
        }
        .conversion-card .label {
            font-weight: 600;
            color: #495057;
        }
        .conversion-card .value {
            font-size: 1.6rem;
            font-weight: 600;
            color: var(--primary-color);
            font-family: 'Cambria Math', serif;
        }
        .conversion-card .sub-value {
            font-size: 1rem;
            color: #6c757d;
        }
        .hp-type-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            margin: 0.1rem 0.2rem;
        }
        .badge-mechanical { background: #cfe2ff; color: #084298; }
        .badge-metric { background: #d1e7dd; color: #0a5c36; }
        .badge-electrical { background: #fff3cd; color: #664d03; }
        .badge-boiler { background: #f8d7da; color: #58151c; }
        .conversion-chart {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        .conversion-chart th {
            background: var(--light-gray);
            font-weight: 600;
            padding: 0.7rem;
            border: 1px solid #dee2e6;
        }
        .conversion-chart td {
            padding: 0.7rem;
            border: 1px solid #dee2e6;
        }
        .conversion-chart tr:nth-child(even) {
            background: rgba(70, 130, 180, 0.03);
        }
        .formula-box {
            background: #f0f4f8;
            border-radius: 8px;
            padding: 1.2rem 1.5rem;
            font-family: 'Cambria Math', 'Latin Modern Math', serif;
            font-size: 1.3rem;
            text-align: center;
            margin: 1rem 0;
            border: 1px solid #dce3ed;
        }
        .input-group-prefix {
            background: #e9ecef;
            padding: 0.375rem 0.75rem;
            border-radius: 0.375rem 0 0 0.375rem;
            border: 1px solid #ced4da;
            border-right: none;
            font-weight: 500;
            display: flex;
            align-items: center;
            color: #495057;
        }
        .input-group-suffix {
            background: #e9ecef;
            padding: 0.375rem 0.75rem;
            border-radius: 0 0.375rem 0.375rem 0;
            border: 1px solid #ced4da;
            border-left: none;
            font-weight: 500;
            display: flex;
            align-items: center;
            color: #495057;
        }
        .power-prefix {
            font-size: 1.4rem;
            font-weight: 300;
        }
        @media (max-width: 768px) {
            .result-display .big-number {
                font-size: 2rem;
            }
            .conversion-card .value {
                font-size: 1.2rem;
            }
        }
        .ref-link {
            color: var(--primary-color);
            text-decoration: none;
        }
        .ref-link:hover {
            text-decoration: underline;
        }
        .faq-highlight {
            background: #f8f9fa;
            padding: 1rem 1.5rem;
            border-radius: 8px;
            border-left: 3px solid var(--primary-color);
        }
        .quick-reference {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .quick-ref-item {
            background: white;
            border: 1px solid #e9ecef;
            border-radius: 8px;
            padding: 1rem;
            text-align: center;
        }
        .quick-ref-item .number {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            font-family: 'Cambria Math', serif;
        }
        .quick-ref-item .desc {
            font-size: 0.85rem;
            color: #6c757d;
        }