.bmi-calculator-container{max-width:550px;margin:0 auto;background:var(--card-bg);padding:2.5rem;border-radius:16px;border:1px solid var(--card-border);}.unit-tabs{display:flex;background:rgba(255,255,255,0.05);border-radius:8px;margin-bottom:2rem;overflow:hidden;}.tab-link{flex:1;padding:1rem;background:none;border:none;color:var(--text-color-light);font-size:1rem;font-weight:500;cursor:pointer;transition:background 0.3s ease;}.tab-link.active{background:var(--primary-color);color:#fff;}.input-section{display:none;flex-direction:column;gap:1.5rem;}.input-section.active{display:flex;}.form-group{width:100%;}.form-group label{display:block;font-weight:500;margin-bottom:0.75rem;}.input-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;}.result-section{visibility:hidden;opacity:0;margin-top:2.5rem;padding-top:2.5rem;border-top:1px solid var(--card-border);text-align:center;transition:opacity 0.5s ease-in-out;}.result-section.show{visibility:visible;opacity:1;}.your-bmi-text{color:var(--text-color-light);font-size:1.1rem;margin:0;}.bmi-value{font-size:4rem;font-weight:700;color:var(--primary-color);margin:0.5rem 0;}.bmi-category{font-size:1.5rem;font-weight:600;margin:0 0 2.5rem 0;}.bmi-gauge{position:relative;width:100%;height:12px;background:linear-gradient(to right,#3b82f6,#22c55e,#f59e0b,#ef4444);border-radius:10px;margin-bottom:0.75rem;}.bmi-indicator{position:absolute;top:-6px;left:0;width:24px;height:24px;background-color:#fff;border-radius:50%;border:3px solid var(--bg-color);box-shadow:0 2px 10px rgba(0,0,0,0.5);transform:translateX(-50%);transition:left 0.5s ease;}.gauge-labels{position:relative;display:flex;justify-content:space-between;font-size:0.8rem;color:var(--text-color-light);padding:0 5%;}.gauge-labels span:nth-child(1){position:absolute;left:30%;transform:translateX(-50%);}.gauge-labels span:nth-child(2){position:absolute;left:55%;transform:translateX(-50%);}.gauge-labels span:nth-child(3){position:absolute;left:75%;transform:translateX(-50%);}