.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:inherit;font-weight:500;line-height:1.2;text-decoration:none;border:none;border-radius:var(--border-radius);cursor:pointer;transition:all var(--transition-fast);position:relative;overflow:hidden;-webkit-user-select:none;-moz-user-select:none;user-select:none;white-space:nowrap}.btn:focus{outline:none;box-shadow:0 0 0 3px rgba(0,113,243,.2)}.btn--disabled,.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.btn--sm{padding:.375rem .75rem;font-size:.875rem;min-height:2rem}.btn--md{padding:.5rem 1rem;font-size:1rem;min-height:2.5rem}.btn--lg{padding:.75rem 1.5rem;font-size:1.125rem;min-height:3rem}.btn--primary{background-color:var(--primary);color:var(--text-light);border:1px solid var(--primary)}.btn--primary:hover:not(:disabled){background-color:var(--primary-dark);border-color:var(--primary-dark);color:var(--text-light);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--primary:active:not(:disabled){transform:translateY(0);box-shadow:var(--shadow-sm)}.btn--secondary{background-color:var(--secondary);color:var(--text-light);border:1px solid var(--secondary)}.btn--secondary:hover:not(:disabled){background-color:var(--secondary-dark);border-color:var(--secondary-dark);color:var(--text-light);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--outline{background-color:transparent;color:var(--primary);border:1px solid var(--primary)}.btn--outline:hover:not(:disabled){background-color:var(--primary);color:var(--text-light);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--ghost{background-color:transparent;color:var(--text-primary);border:1px solid transparent}.btn--ghost:hover:not(:disabled){background-color:var(--bg-secondary);border-color:var(--secondary-light);color:var(--text-primary)}.btn--link{background-color:transparent;color:var(--primary);border:none;text-decoration:underline;padding:0;min-height:auto}.btn--link:hover:not(:disabled){color:var(--primary-dark);text-decoration:none;transform:none;box-shadow:none}.btn--loading{color:transparent;pointer-events:none}.btn--full-width{width:100%}.btn__icon{display:flex;align-items:center;justify-content:center}.btn__icon--left{margin-right:.25rem}.btn__icon--right{margin-left:.25rem}.btn__text{display:flex;align-items:center}.btn__loader{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:1rem;height:1rem;border:2px solid transparent;border-top-color:currentcolor;border-radius:50%;animation:btn-spin 1s linear infinite}@keyframes btn-spin{0%{transform:translate(-50%,-50%) rotate(0deg)}to{transform:translate(-50%,-50%) rotate(1turn)}}@media (max-width:768px){.btn--lg{padding:.625rem 1.25rem;font-size:1rem}.btn--md{padding:.5rem .875rem;font-size:.875rem}.sendButton .btn{min-width:40px;padding:.35rem;justify-content:center;gap:0}.sendButton .btn__icon--left{margin-right:0}.sendButton .btn__text{display:none}.messageInput{gap:.25rem}}