.math-result { padding: 15px; background: white; border-radius: 4px; border: 1px solid #eee; font-size: 1.5rem; font-family: 'Cambria Math', serif; margin: 10px 0; text-align: center; }
        .math-equation { font-size: 1.3rem; padding: 15px; background: rgba(70,130,180,0.05); border-left: 4px solid var(--primary-color); border-radius: 4px; margin: 15px 0; }
        .subsection-title { font-weight: 600; margin-top: 2rem; margin-bottom: 1rem; color: var(--accent-color); font-size: 1.2rem; }
        .math-box { background: rgba(70,130,180,0.05); border-left: 3px solid var(--primary-color); padding: 1rem; border-radius: 0 4px 4px 0; margin: 1.5rem 0; }
        .function-examples { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0; }
        .example-btn { background: rgba(70,130,180,0.1); border: 1px solid rgba(70,130,180,0.2); border-radius: 4px; padding: 0.5rem 0.75rem; font-size: 0.9rem; color: var(--primary-color); cursor: pointer; transition: all 0.2s; font-family: 'Courier New', monospace; }
        .example-btn:hover { background: rgba(70,130,180,0.2); transform: translateY(-2px); }
        .math-notation { font-family: 'Cambria Math', serif; font-size: 1.1rem; }
        .property-table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
        .property-table th, .property-table td { padding: 0.75rem; text-align: left; border: 1px solid var(--border-color); }
        .property-table th { background: var(--light-gray); font-weight: 600; }
        .authority-note { font-size: 0.85rem; color: var(--text-muted); border-top: 1px solid var(--border-color); padding-top: 1rem; margin-top: 1rem; text-align: right; }
        .case-study { background: #f0f7fa; border-radius: 8px; padding: 1.5rem; margin: 1.5rem 0; border-left: 5px solid var(--primary-color); }
        .key-point { font-weight: 500; color: var(--accent-color); }
        .result-row { font-size: 1.2rem; margin: 0.5rem 0; }
        .result-value { font-weight: 600; color: var(--primary-color); font-size: 2rem; }
        .flow-regime { font-size: 1.4rem; font-weight: 600; padding: 0.2rem 0.8rem; border-radius: 2rem; display: inline-block; }
        .laminar-bg { background: #d1ecf1; color: #0c5460; }
        .transition-bg { background: #fff3cd; color: #856404; }
        .turbulent-bg { background: #f8d7da; color: #721c24; }
        .visco-switch { background: #f8f9fa; padding: 0.8rem; border-radius: 8px; margin-bottom: 1rem; }
        .flow-canvas { width: 100%; background: #f9f9f9; border-radius: 12px; margin-top: 1rem; border: 1px solid #dee2e6; }
        .legend { display: flex; justify-content: center; gap: 1.5rem; margin: 0.75rem 0; font-size: 0.85rem; flex-wrap: wrap; }
        .legend-color { width: 18px; height: 18px; display: inline-block; border-radius: 4px; margin-right: 5px; vertical-align: middle; }
        .unit-note { font-size: 0.85rem; color: #6c757d; }
        .preset-group { display: flex; flex-wrap: nowrap; overflow-x: auto; gap: 8px; margin: 12px 0; padding-bottom: 5px; -webkit-overflow-scrolling: touch; }
        .preset-group .example-btn { flex: 0 0 auto; }
        .unit-select-group { display: flex; gap: 12px; flex-wrap: wrap;  align-items: center; }
        .temp-card { background: #eef2f5; border-radius: 8px; padding: 0.8rem; margin-top: 1rem; }
        .temp-slider { width: 100%; max-width: 300px; }
        .friction-hint { background: #fef9e6; border-left: 4px solid #ffc107; padding: 1rem; margin-top: 1rem; border-radius: 4px; font-size: 0.95rem; }
        .btn-sm-icon { padding: 0.25rem 0.5rem; font-size: 0.75rem; }