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0;line-height:1.6}.step-result{background:linear-gradient(135deg,#f0f4ff 0%,#e8edff 100%);padding:.75rem 1rem;border-radius:8px;font-weight:600;color:#667eea;margin-top:.75rem}.error-message{background:linear-gradient(135deg,#fed7d7 0%,#feb2b2 100%);color:#c53030;padding:1rem;border-radius:8px;margin:1rem 0;display:flex;align-items:center;gap:.75rem}.error-message i{font-size:1.5rem}.error-message.hidden{display:none}.form-input.invalid{border-color:#fc8181;background:#fff5f5}.form-input.invalid:focus{box-shadow:0 0 0 3px rgba(252,129,129,.1)}.tooltip-icon{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:50%;background:#667eea;color:#fff;font-size:.75rem;margin-left:.5rem;cursor:help}.related-links{list-style:none;padding:0;margin:0}.related-links li{margin-bottom:.75rem}.related-links a{display:flex;align-items:center;gap:.5rem;color:#667eea;text-decoration:none;transition:all .2s ease;padding:.5rem;border-radius:6px}.related-links a:hover{background:#f0f4ff;transform:translateX(5px)}.calculating-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(102,126,234,.1);z-index:1000;align-items:center;justify-content:center}.calculating-overlay.visible{display:flex}.calculating-spinner{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 8px 32px rgba(0,0,0,.1);display:flex;flex-direction:column;align-items:center;gap:1rem}.spinner{width:40px;height:40px;border:4px solid #e0e0e0;border-top-color:#667eea;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:768px){.special-lines-grid{grid-template-columns:1fr}#triangleCanvas{height:300px}.result-value{font-size:1.1rem}.result-value.large{font-size:1.3rem}}@media(max-width:576px){.action-buttons-grid{grid-template-columns:1fr}.calculation-step{padding:1rem}.step-formula{font-size:.9rem}#triangleCanvas{height:250px}}@media print{.action-buttons-grid,.toggle-steps-btn{display:none}.steps-content{display:block !important}.glass-card{page-break-inside:avoid}}