.btn{display:inline-flex;align-items:center;justify-content:center;gap:0.5rem;padding:0.625rem 1.25rem;font-size:0.875rem;font-weight:500;line-height:1.5;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:var(--transition-fast);white-space:nowrap;text-decoration:none;color:var(--text-primary)}.btn:disabled{opacity:0.6;cursor:not-allowed}.btn-primary{background:var(--gradient-primary);color:white;border-color:transparent;box-shadow:0 4px 15px rgba(var(--primary-rgb),0.3);position:relative;overflow:hidden}.btn-primary::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,0.2),transparent);opacity:0;transition:opacity 0.3s ease}.btn-primary:hover:not(:disabled)::before{opacity:1}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 20px rgba(var(--primary-rgb),0.4)}.btn-primary i.fa-arrow-right,.btn-primary i.fa-paper-plane{transition:transform 0.3s cubic-bezier(0.22,0.61,0.36,1)}.btn-primary:hover:not(:disabled) i.fa-arrow-right{transform:translateX(4px)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border)}.btn-secondary:hover:not(:disabled){background:var(--border)}.btn-outline{background:transparent;color:var(--text-primary);border-color:var(--border)}.btn-outline:hover:not(:disabled){background:var(--bg-tertiary)}.btn-success{background:var(--success);color:white;border-color:var(--success)}.btn-success:hover:not(:disabled){filter:brightness(0.9)}.btn-danger{background:var(--error);color:white;border-color:var(--error)}.btn-danger:hover:not(:disabled){filter:brightness(0.9)}.btn-warning{background:var(--warning);color:var(--brand-ink);border-color:var(--warning)}.btn-warning:hover:not(:disabled){filter:brightness(0.9)}.btn-ghost{background:transparent;color:var(--text-secondary);border-color:transparent}.btn-ghost:hover:not(:disabled){background:var(--bg-tertiary);color:var(--text-primary)}.btn-sm{padding:0.375rem 0.75rem;font-size:0.8125rem}.btn-lg{padding:1rem 2.25rem;font-size:1.05rem;font-weight:600}.btn-icon{width:2.25rem;height:2.25rem;padding:0}.btn-icon.btn-sm{width:1.75rem;height:1.75rem}.btn-icon.btn-lg{width:2.75rem;height:2.75rem}.btn i,.btn svg{font-size:0.875em}.btn-group{display:inline-flex;gap:0.5rem}.btn-group-vertical{flex-direction:column}.btn.btn-whatsapp{background:#25D366;color:#ffffff;border-color:#25D366}.btn.btn-whatsapp:hover:not(:disabled){background:#128C7E;border-color:#128C7E}.btn-toggle-password{position:absolute;right:0.75rem;top:50%;transform:translateY(-50%);background:transparent;border:none;color:var(--text-secondary);cursor:pointer;padding:0.25rem;font-size:0.875rem;transition:var(--transition-fast)}.btn-toggle-password:hover{color:var(--text-primary)}